Physical Review D

In multi-Higgs-doublet models the alignment in flavor space of the relevant Yukawa matrices guarantees the absence of tree-level flavor-changing couplings of the neutral scalar fields. We analyze the consequences of this condition within the two-Higgs-doublet model and show that it leads to a generi...

We report measurements of the exclusive cross section for e⁺e^-→D⁰D^*-π⁺ as a function of center-of-mass energy from the D⁰D^*-π⁺ threshold to 5.2 GeV with initial-state radiation. No evidence is found for Y(4260)→D⁰D^*-π⁺ decays. The analysis is based on a data sample collected with the Belle d...

Solar and KamLAND data are in slight tension when interpreted in the standard two-flavor oscillations framework and this may be alleviated allowing for a nonzero value of the mixing angle θ₁₃. Here we show that, likewise, nonstandard flavor-changing interactions (FCI), possibly intervening in the p...

We study a new supersymmetric mechanism for lepton flavor violation in μ and Ï„ decays and μ→e conversion in nuclei, within a minimal extension of the minimal supersymmetric standard model with low-mass heavy singlet neutrinos and sneutrinos. We find that the decays μ→eγ, τ→eγ and τ→Î...

Some deviations from special relativity—especially isotropic effects—are most efficiently constrained using particles with velocities very close to 1. While there are extremely tight bounds on some of the relevant parameters coming from astrophysical observations, many of these rely on our havin...

We point out that mirror dark matter predicts low-energy (E_R≲2  keV) electron recoils from mirror electron scattering as well as nuclear recoils from mirror ion scattering. The former effect is examined and applied to the recently released low-energy electron recoil data from the CDMS Collabor...

We measure the rate of D⁰-D̅ ⁰ mixing with the observable y_CP=(τ_Kπ/τ_KK)-1, where τ_KK and τ_Kπ are, respectively, the mean lifetimes of CP-even D⁰→K⁺K^- and CP-mixed D⁰→K^-π⁺ decays, using a data sample of 384  fb^-1 collected by the BABAR detector at the SLAC PEP-II asymmetric-en...

We have developed an efficient simulation algorithm for strongly interacting relativistic fermions in two-dimensional field theories based on a formulation as a loop gas. It essentially eliminates critical slowing down by sampling two-point correlation functions and allows simulations directly in th...

D_s mesons are investigated in a semiclassic flux tube model where the spin-orbit interaction is taken into account. Spectrum of D-wave D_s is predicted. The predicted spectrum is much lower than most previous predictions. Analysis of some D_s candidates is made. D_sJ(2632)⁺ may be a 1^- j^P=3 / 2^...

We combine measurements of the top quark pair production cross section in pp̅ collisions in the ℓ+jets, ℓℓ, and τℓ final states (where ℓ is an electron or muon) at a center of mass energy of sqrt[s] =1.96  TeV in 1  fb^-1 of data collected with the D0 detector. For a top ...

Recently dispersion relations have been applied to hard exclusive processes such as deeply virtual Compton scattering, and a holographic principle was proposed that maps out the generalized parton distributions entering the soft matrix elements for the processes from their values on a given kinemati...

We propose a new mechanism for generating small neutrino masses which predicts the relation m_ν∼v⁴/M³, where v is the electroweak scale, rather than the conventional seesaw formula m_ν∼v²/M. Such a mass relation is obtained via effective dimension seven operators LLHH(H^†H)/M³, which arise when...

We present a search for associated production of the standard model Higgs boson and a Z boson where the Z boson decays to two leptons and the Higgs decays to a pair of b quarks in pp̅ collisions at the Fermilab Tevatron. We use event probabilities based on standard model matrix elements to...

We examine various direct and indirect constraints on the lepton-specific two-Higgs-doublet model and scrutinize the property of the Higgs bosons in the allowed parameter space. We find that in the allowed parameter space the CP-odd Higgs boson A is rather light (m_Alt;30  GeV with 95% possibili...

We present a search for charged Higgs bosons in decays of top quarks, in the mass range 80lt;m_H^±lt;155  GeV, assuming the subsequent decay H⁺→τ⁺ν_τ (and its charge conjugate). Using 0.9  fb^-1 of lepton+jets data collected with the D0 detector at the Fermilab Tevatron pp̅ col...

We compute the entropy density of the confined phase of QCD without quarks on the lattice to very high accuracy. The results are compared to the entropy density of free glueballs, where we include all the known glueball states below the two-particle threshold. We find that an excellent, parameter-fr...

We present a generic method for improving the effectiveness of heavy particle searches in hadronic channels at the Large Hadron Collider. By selectively removing, or pruning, protojets from the substructure provided by a k_T-type jet algorithm, we improve the mass resolution for heavy decays and decr...

Using a sample of 2.59×10⁷ ψ(2S) decays collected by the CLEO-c detector, we present results of a search for the decay chain ψ(2S)→π⁰h_c, h_c→n(π⁺π^-)π⁰, n=1, 2, 3. We observe no significant signals for n=1 and n=3 and set upper limits for the corresponding decay rates. First evidence for th...

We report the observation of the baryonic B-decay B̅ ⁰→Λ_c⁺p̅ K^-π⁺, excluding contributions from the decay B̅ ⁰→Λ_c⁺Λ̅ K^-. Using a data sample of 467×10⁶ BB̅ pairs collected with the BABAR detector at the PEP-II storage ring at SLAC, the measured ...

Recent measurements of the top quark charge asymmetry at Tevatron disfavor the existence of flavor universal axigluons and colorons at 2σ. In this letter, we explore the possibility of reconciling the data with these models and use the charge asymmetry and the invariant mass distribution of top-ant...

Past and recent data analyses gave some hints of steps in dark energy. Considering dark energy as a dynamical scalar field, we investigate several models with various steps: a step in the scalar potential, a step in the kinetic term, a step in the energy density, and a step in the equation-of-state ...

We investigate the course of cosmic expansion in its recent past using the Constitution SN Ia sample, along with baryon acoustic oscillations (BAO) and cosmic microwave background (CMB) data. Allowing the equation of state of dark energy (DE) to vary, we find that a coasting model of the universe (q_...

Hořava-Lifshitz theory has been recently put forth as a proposal for a renormalizable theory of quantum gravity . It explicitly breaks Lorentz invariance, introducing an apparent extra scalar degree of freedom. I show that the low energy limit of (non-projectible) Hořava-Lifshitz gravity is unique...

It has recently been argued that the PAMELA, ATIC, and PPB-BETS data showing an anomalous excess of high-energy cosmic ray positrons and electrons might be explained by dark matter annihilating in the Galactic halo with a cross section resonantly enhanced compared to its value in the primeval plasma...

The full moments expansion of the joint probability distribution of an isotropic random field, its gradient, and invariants of the Hessian are presented in 2 and 3D. It allows for explicit expression for the Euler characteristic in ND and computation of extrema counts as functions of the excursion s...

Bekenstein’s tensor-vector-scalar (TeVeS) theory has had considerable success as a relativistic theory of modified Newtonian dynamics. However, recent work suggests that the dynamics of the theory are fundamentally flawed and numerous authors have subsequently begun to consider a generalization of...

If the dark matter sector in the Universe is composed by metastable particles, galaxies and galaxy clusters are expected to undergo significant secular evolution from high to low redshift. We show that the decay of dark matter, with a lifetime compatible with cosmological constraints, can be at the ...

We propose an unified model of dark matter and baryon asymmetry in a leptophilic world above the electroweak scale. We provide an example where the inflaton decay products subsequently generate a lepton asymmetry and a dark matter abundance with an unique coupling in the early Universe, while the pr...

D=11 supergravity near a spacelike singularity admits a cosmological billiard description based on the hyperbolic Kac-Moody group E₁₀. The quantization of this system via the supersymmetry constraint is shown to lead to wave functions involving automorphic (Maass wave) forms under the modular group ...

We propose a new approach, based on the puncture method, to construct black hole initial data in the so-called trumpet geometry, i.e. on slices that asymptote to a limiting surface of nonzero areal radius. Our approach is easy to implement numerically and, at least for nonspinning black holes, does ...

We present the result from a precision measurement of the mass of the τ lepton, M_τ, based on 423  fb^-1 of data recorded at the Υ(4S) resonance with the BABAR detector. Using a pseudomass endpoint method, we determine the mass to be 1776.68±0.12(stat)±0.41(syst)  MeV. We also measure the...

We present measurements of the top quark mass (m_t) in tt̅ candidate events with two final state leptons using 1  fb^-1 of data collected by the D0 experiment. Our data sample is selected by requiring two fully identified leptons or by relaxing one lepton requirement to an isolated track...

We present measurements of the branching fraction B and longitudinal polarization fraction f_L for B⁰→₁(1260)⁺a₁(1260)^- decays, with a₁(1260)^±→π^-π⁺π^±. The data sample, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represents 465×10⁶ produced BB̅ p...

We study a specific texture of the neutrino mass matrix, namely the models with one 2×2 subdeterminant equal to zero. We carry out a complete phenomenological analysis with all possible relevant correlations. Every pattern of the six possible ones is found able to accommodate the experimental data,...

The baryon magnetic and transition magnetic moments are computed in heavy baryon chiral perturbation theory in the large-N_c limit, where N_c is the number of colors. One-loop nonanalytic corrections of orders m_q^1/2/span> and m_qln⁡m_q are incorporated into the analysis, where contributions of both intermed...

Using the unitarity, SU(2) and C invariance of hadronic interactions, the bounds on final state phases are derived. It is shown that values obtained for the final state phases relevant for the direct CP asymmetries A_CP(B⁰→K⁺π^-,K⁰π⁰) are compatible with experimental values for these asymmetries. ...

We describe a novel use of the Dalitz plot to probe CP symmetry in three-body modes of B and D mesons. It is based on an observable inspired by astronomers’ practice, namely the significance in the difference between corresponding Dalitz plot bins. It provides a model-independent mapping of local ...

In multi-Higgs-doublet models the alignment in flavor space of the relevant Yukawa matrices guarantees the absence of tree-level flavor-changing couplings of the neutral scalar fields. We analyze the consequences of this condition within the two-Higgs-doublet model and show that it leads to a generi...

Previous work on electroweak radiative corrections to high-energy scattering using soft-collinear effective theory (SCET) has been extended to include external transverse and longitudinal gauge bosons and Higgs bosons. This allows one to compute radiative corrections to all parton-level hard scatter...

Group theoretical arguments seem to indicate the discrete symmetry S₄ as the minimal flavor symmetry compatible with tribimaximal neutrino mixing. We prove in a model-independent way that indeed S₄ can realize exact tribimaximal mixing through different symmetry breaking patterns. We present two mod...

We discuss cosmological consequences of the existence of physics beyond the standard model that exhibits Banks-Zaks and unparticle behavior in the UV and IR, respectively. We first derive the equation of state for unparticles and use it to obtain the temperature dependence of the corresponding energ...

We show that three-dimensional massive gravity admits Lifshitz metrics with generic values of the dynamical exponent z as exact solutions. At the point z=3, exact black hole solutions that are asymptotically Lifshitz arise. These spacetimes are three-dimensional analogues of those that were recently...

In the framework of phantom quintessence cosmology, we use the Noether Symmetry Approach to obtain general exact solutions for the cosmological equations. This result is achieved by the quintessential (phantom) potential determined by the existence of the symmetry itself. A comparison between the th...

We construct a massive non-Abelian N=1 supersymmetric Yang-Mills theory on R³. This is achieved by using a nonlocal gauge and a Poincare invariant mass term for gluons due to Nair. The underlying supersymmetry algebra is shown to be a noncentral extension of the Poincare algebra by the spacetime rot...

We construct exact two-dimensional conformal field theories, corresponding to closed string tachyon and metric profiles invariant under shifts in a null coordinate, which can be constructed from any two-dimensional renormalization group flow. These solutions satisfy first order equations of motion i...

Weak gravitational lensing leaves a characteristic imprint on the cosmic microwave background temperature and polarization angular power spectra. Here, we investigate the possible constraints on the integrated lensing potential from future cosmic microwave background angular spectra measurements exp...

We study the impact of a strongly first-order electroweak phase transition on the thermal relic abundance of particle species that could constitute the dark matter and that decoupled before the phase transition occurred. We define a dilution factor induced by generic first-order phase transitions, a...

One of the most active field of research in general relativity is the description of the spin properties of astrophysical objects. The main tool in the description of the gravitational waves emitted by compact binary systems in the inspiral era is the post-Newtonian (PN) approximation, where spin ef...

In this article we quantize (massive) higher spin (1≤j≤2) fields by means of Dirac’s constrained Hamilton procedure both in the situation were they are totally free and were they are coupled to (an) auxiliary field(s). A full constraint analysis and quantization is presented by determining and...

A spin foam model of three dimensional gravity nonminimally coupled with a scalar field is studied. By discretization of the scalar field, the model is worked out precisely in a purely combinational way. It is shown that the quantum physics of the scalar matter is totally encoded into the modified d...

Using a Legendre transformation, we compute the unconstrained Hamiltonian of a spinning test particle in a curved spacetime at linear order in the particle spin. The equations of motion of this unconstrained Hamiltonian coincide with the Mathisson-Papapetrou-Pirani equations. We then use the formali...

The absorption cross section of Reissner-Nordström black holes for the electromagnetic field is computed numerically for arbitrary frequencies, taking into account the coupling of the electromagnetic and gravitational perturbations. We also compute the conversion coefficients of electromagnetic to ...

We show that a Nambu-Jona-Lasinio type four-fermion coupling at the z=3 Lifshitz-like fixed point in 3+1 dimensions is asymptotically free and generates a mass scale dynamically. This result is nonperturbative in the limit of a large number of fermion species. The theory is ultraviolet complete and ...

We use the semiclassical approximation in perturbative scalar quantum electrodynamics to calculate the quantum correction to the Larmor radiation formula to first order in Planck’s constant in the nonrelativistic approximation, choosing the initial state of the charged particle to be a momentum ei...

We present updated measurements of the branching fractions for nbsp;meson decays to , , , , , , , and , and branching fractions and -violating charge asymmetries for nbsp;decays to , , , and . The data represent the full dataset of 467times;106 nbsp;pairs collected with the nbsp;detector at the 2 asymmetric-energy collider at the SLAC National Accelerator Laboratory. Besides large signals for the four charged B decay modes and for \Bz\etapr K0, we find evidence for three nbsp;decay modes at greater than 3.0s significance. We find \calB(\Bz\fetakz) = (1.15+0.43-0.38 0.09)times;10-6, \calB(\Bz\fetaomega) = (0.94+0.35-0.300.09)times;10-6, and \calB(\Bz\fetapomega) = (1.01+0.46-0.380.09)times;10-6, where the first (second) uncertainty is statistical (systematic). For the \Bp\fetakp decay mode, we measure the charge asymmetry \calAch(\Bp\fetakp) = -0.36 0.11 0.03.

We employ both top-down and bottom-up holographic dual models of QCD to calculate vertex functions and couplings that are induced by the five dimensional Chern-Simons term. We use these couplings to study the photoproduction of f1 mesons. The Chern-Simons-term-induced interaction leads to a simple relation between the polarization of the incoming photon and the final state f1 meson which should allow a clear separation of this interaction from competing processes.

We discuss the possible enhancement of the tau lepton events, with the emphasis on the signals with three or more hadronic taus, at LHC when the left-handed stau doublet becomes light or even lighter than the right-handed one. This is the natural outcome of the supersymmetric seesaw models where the slepton doublet mass is suppressed by the effects of a large neutrino Yukawa coupling. We study a few representative parameter sets in the sneutrino coannihilation regions where the tau sneutrino is next-to-lightest supersymmetric particle (NLSP) and the stau coannihilation regions where the stau is NLSP both of which yield the thermal neutralino LSP (lightest supersymmetric particle) abundance determined by WMAP.

We study the vector-vector interaction within the framework of the hidden gauge formalism for the channels with quantum numbers Charm C=0 and Strangeness S=0 in the energy region around 4000 MeV. By looking for poles in the complex plane we find three resonances that could be identified by the mass, width and quantum numbers with the Y(3940), Z(3940) and X(4160), these poles appear with isospin I=0 and JPC=0++, 2++ and 2++ respectively. Whereas the Y(3940) and Z(3940) are coupled more strongly to D*[`D]*, the X(4160) is basically a D*s [`D]*s molecular state. Another two extra resonances appear in our approach with I=0, 1 and JPC=1+-, 2++ which are not found in the PDG with masses M=3945, 3912 MeV and widths G = 0, 120 MeV respectively.

It has been suggested that dark matter particles which scatter inelastically from detector target nuclei could explain the apparent incompatibility of the DAMA modulation signal (interpreted as evidence for particle dark matter) with the null results from CDMS-II and XENON10. Among the predictions of inelastically interacting dark matter are a suppression of low-energy events, and a population of nuclear recoil events at higher nuclear recoil equivalent energies. This is in stark contrast to the well-known expectation of a falling exponential spectrum for the case of elastic interactions. We present a new analysis of XENON10 dark matter search data extending to Enr=75nbsp;keV nuclear recoil equivalent energy. Our results exclude a significant region of previously allowed parameter space in the model of inelastically interacting dark matter. In particular, it is found that dark matter particle masses mc >~150nbsp;GeV are disfavored.

We study the production of C=+ charmonium states X in e+e-gnbsp;+nbsp;X at B factories with X=hc(nS) (n=1,2,3), ccJ(mP) (m=1,2), and 1D2(1D). In the S and P wave case, contributions of QED with one-loop QCD corrections are calculated within the framework of nonrelativistic QCD(NRQCD) and in the D-wave case only the QED contribution is considered. We find that in most cases the one-loop QCD corrections are negative and moderate, in contrast to the case of double charmonium production e+e- J/ynbsp;+nbsp;X, where one-loop QCD corrections are positive and large in most cases. We also find that the production cross sections of some of these states in e+e- gnbsp;+nbsp;X are larger than that in e+e- J/ynbsp;+nbsp;X by an order of magnitude even after the negative one-loop QCD corrections are included. We then argue that search for the X(3872), X(3940), Y(3940), and X(4160) in e+e- gnbsp;+nbsp;X at B factories may be helpful to clarify the nature of these states. For completeness, the production of bottomonium states in e+e- annihilation is also discussed.

We have analyzed the atmospheric neutrino data to study the octant of q23 and the precision of the oscillation parameters for a large Iron CALorimeter (ICAL) detector. The ICAL being a tracking detector has the ability to measure the energy and the direction of the muon with high resolution. From bending of the track in magnetic field it can also distinguish its charge. We have generated events by Nuance and then considered only the muons (directly measurable quantities) produced in charge current interactions in our analysis. This encounters the main problem of wide resolutions of energy and baseline. The energy-angle correlated two dimensional resolution functions are used to migrate the energy and the zenith angle of the neutrino to those of the muon. A new type of binning has been introduced to get better reflection of the oscillation pattern in chi-square analysis. Then the marginalization of the c2 over all parameters has been carried out for neutrinos and anti-neutrinos separately. We find that the measurement of q13 is possible at a significant precision with atmospheric neutrinos. The precisions of Dm322 and sin2q23 are found ~ 8% and 38%, respectively, at 90% CL. The discrimination of the octant as well as the deviation from maximal mixing of atmospheric neutrinos are also possible for some combinations of (q23, nbsp;q13). We also discuss the impact of the events at near horizon on the precision studies.

The matter effects for solar neutrino oscillations are studied in a general scheme with an arbitrary number of sterile neutrinos, without any constraint on the mixing, assuming only a realistic hierarchy of neutrino squared-mass differences in which the smallest squared-mass difference is effective in solar neutrino oscillations. The validity of the analytic results are illustrated with a numerical solution of the evolution equation in three examples of the possible mixing matrix in the simplest case of four-neutrino mixing.

We propose a method for determining the mass difference between two particles, \slep1 and \slep2, that are nearly degenerate, with Dm m2-m1 << m1. This method applies when (a) the \slep1 momentum can be measured, (b) \slep2 can only decay to \slep1, and (c) \slep1 and \slep2 can be produced in the decays of a common mother particle. For small Dm, \slep2 cannot be reconstructed directly, because its decay products are too soft to be detected. Despite this, we show that the existence of \slep2 can be established by observing the shift in the mother particle invariant-mass peak, when reconstructed from decays to \slep2. We show that measuring this shift would allow us to extract Dm. As an example, we study supersymmetric gauge-gravity hybrid models in which \slep1 is a meta-stable charged slepton next-to-lightest supersymmetric particle and \slep2 is the next-to-lightest slepton with Dm ~ 5nbsp;\gev.

We study the effect that FCNC interactions of thetop quark will have on the branching ratio of charged decays of the top quark. We have performed an integrated analysis using Tevatron and B-factories data and with just the further assumption that the CKM matrix is unitary we can obtain very restrictive bounds on the strong and electroweak FCNC branching ratios Br(tnbsp;nbsp;qnbsp;X)nbsp;nbsp; < nbsp;nbsp;4.0times;10-4, where X is any vector boson and a sum in q=u,c is implied.

We study spherically-symmetric structures in Conformal Gravity and in a scalar-tensor extension and gain some more insight about these gravitational theories. In both cases we analyze solutions in two systems: perfect fluid solutions and boson stars of a self-interacting complex scalar field. In the purely tensorial (original) theory we find in a certain domain of parameter space finite mass solutions with a linear gravitational potential but without a Newtonian contribution. The scalar-tensor theory exhibits a very rich structure of solutions whose main properties are discussed. Among them, solutions with a finite radial extension, open solutions with a linear potential and logarithmic modifications and also a (scalar-tensor) gravitational soliton. This may also be viewed as a static self-gravitating boson star in purely tensorial Conformal Gravity.

In the context of f(R) theories of gravity, we address the problem of finding static and spherically symmetric black hole solutions. Several aspects of constant curvature solutions with and without electric charge are discussed. We also study the general case (without imposing constant curvature). Following a perturbative approach around the Einstein-Hilbert action, it is found that only solutions of the Schwarzschild-(Anti) de Sitter type are present up to second order in perturbations. Explicit expressions for the effective cosmological constant are obtained in terms of the f(R) function. Finally, we have considered the thermodynamics of black holes in Anti-de Sitter space-time and found that this kind of solutions can only exist provided the theory satisfies R0+f(R0) < 0. Interestingly, this expression is related to the condition which guarantees the positivity of the effective Newton's constant in this type of theories. In addition, it also ensures that the thermodynamical properties in f(R) gravities are qualitatively similar to those of standard General Relativity.

We study the strong gravity regime in viable models of so-called f(R) gravity that account for the observed cosmic acceleration. In contrast with recent works suggesting that very relativistic stars might not exist in these models, we find numerical solutions corresponding to static star configurations with a strong gravitational field. The choice of the equation of state for the star is crucial for the existence of solutions. Indeed, if the pressure exceeds three times the energy density in a large part of the star, static configurations do not exist. In our analysis, we use a polytropic equation of state, which is not plagued with this problem and, moreover, provides a better approximation for a realistic neutron star.

Given a scalar field with metastable minima, bubbles nucleate quantum mechanically. When bubbles collide, energy stored in the bubble walls is converted into kinetic energy of the field. This kinetic energy can facilitate the classical nucleation of new bubbles in minima that lie below those of the "parent" bubbles. This process is efficient and classical, and changes the dynamics and statistics of bubble formation in models with multiple vacua, relative to that derived from quantum tunneling.

We study the hadron-quark phase transition with the finite size effects at finite temperature. For the hadron phase, we adopt a realistic equation of state in the framework of the Brueckner-Hartree-Fock theory including hyperons. The properties of the mixed phase are clarified by considering the finite size effects under the Gibbs conditions. We find that the equation of state becomes softer than that at zero-temperature for some density region. We also find that the equation of state gets closer to that given by the Maxwell construction. Moreover, the number of hyperons is suppressed by the presence of quarks. These are characteristic features of the hadron-quark mixed phase, and should be important for many astrophysical phenomena such as mergers of binary neutron stars.

The Gauss-Codazzi method is used to discuss the gravitational collapse of a charged Reisner-Nordstr#246;m domain wall. We solve the classical equations of motion of a thin charged shell moving under the influence of its own gravitational field and show that a form of cosmic censorship applies. If the charge of the collapsing shell is greater than its mass, then the collapse does not form a black hole. Instead, after reaching some minimal radius, the shell bounces back. The Schrodinger canonical formalism is used to quantize the motion of the charged shell. The limits near the horizon and near the singularity are explored. Near the horizon, the Schrodinger equation describing evolution of the collapsing shell takes the form of the massive wave equation with a position dependent mass. The outgoing and incoming modes of the solution are related by the Bogolubov transformation which precisely gives the Hawking temperature. Near the classical singularity, the Schrodinger equation becomes non-local, but the wave function describing the system is non-singular. This indicates that while quantum effects may be able to remove the classical singularity, it may also introduce some new effects.

Infinite statistics in which all representations of the symmetric group can occur is known as a special case of quon theory. However, the validity of relativistic quon theories is still in doubt. In this paper we prove that there exists a relativistic quantum field theory which allows interactions involving infinite statistics particles. We also give some consistency analysis of this theory such as conservation of statistics and Feynman rules.

In this paper we study the entropy perturbations in N-flation by using the \maN formalism. We calculate the entropy corrections to the power spectrum of the overall curvature perturbation P\z. We obtain an analytic form of the transfer coefficient T2\maR\maS, which describes the correlation between the curvature and entropy perturbations, and investigate its behavior numerically. It turns out that the entropy perturbations cannot be neglected in N-flation, because the amplitude of entropy components is approximately in the same order as the adiabatic one at the end of inflation T2\maR\maS ~ \maO(1). The spectral index nS is calculated and it becomes smaller after the entropy modes are taken into account, i.e., the spectrum becomes redder, compared to the pure adiabatic case. Finally we study the modified consistency relation of N-flation, and find that the tensor-to-scalar ratio (r @ 0.006) is greatly suppressed by the entropy modes, compared to the pure adiabatic one (r @ 0.017) at the end of inflation.

We consider a deformation of the AdS5times;S5 solution of IIB supergravity obtained by taking the boundary value of the dilaton to be time dependent. The time dependence is taken to be slowly varying on the AdS scale thereby introducing a small parameter e. The boundary dilaton has a profile which asymptotes to a constant in the far past and future and attains a minimum value at intermediate times. We construct the sugra solution to first non-trivial order in e, and find that it is smooth, horizon free, and asymptotically AdS5times;S5 in the far future. When the intermediate values of the dilaton becomes small enough the curvature becomes of order the string scale and the sugra approximation breaks down. The resulting dynamics is analysed in the dual SU(N) gauge theory on S3 with a time dependent coupling constant which varies slowly. When N e << 1, we find that a quantum adiabatic approximation is applicable, and use it to argue that at late times the geometry becomes smooth AdS5times;S5 again. When N e >> 1, we formulate a classical adiabatic perturbation theory based on coherent states which arises in the large N limit. For large values of the 'tHooft coupling this reproduces the supergravity results. For small 'tHooft coupling the coherent state calculations become involved and we cannot reach a definite conclusion. We argue that the final state should have a dual description which is mostly smooth AdS5 space with the possible presence of a small black hole.

We investigate the hypothesized existence of an S-matrix for gravity, and some of its expected general properties. We first discuss basic questions regarding existence of such a matrix, including those of infrared divergences and description of asymptotic states. Distinct scattering behavior occurs in the Born, eikonal, and strong gravity regimes, and we describe aspects of both the partial wave and momentum space amplitudes, and their analytic properties, from these regimes. Classically the strong gravity region would be dominated by formation of black holes, and we assume its unitary quantum dynamics is described by corresponding resonances. Masslessness limits some powerful methods and results that apply to massive theories, though a continuation path implying crossing symmetry plausibly still exists. Physical properties of gravity suggest nonpolynomial amplitudes, although crossing and causality constrain (with modest assumptions) this nonpolynomial behavior, particularly requiring a polynomial bound in complex s at fixed physical momentum transfer. We explore the hypothesis that such behavior corresponds to a nonlocality intrinsic to gravity, but consistent with unitarity, analyticity, crossing, and causality.

A one-loop effective potential of the Higgs field on the Schwarzschild background is derived in the framework of a toy model: a SO(N) scalar multiplet interacting with the gauge fields, the SO(N) gauge symmetry being broken by the Higgs mechanism. As expected, the potential depends on the space point and results in a mass shift of all massive particles near a black hole. It is shown that the obtained potential is generally covariant, depends on the space point through the metric component g00 in the adapted coordinates, and has the same form for an arbitrary static, spherically symmetric background. Some properties of this potential are investigated. In particular, if the conformal symmetry holds valid for massless particles on the given background, there exist only two possible scenarios depending on a sign of an arbitrary constant arising from the regularization procedure: the masses of all massive particles grow infinitely, when they approach the black hole horizon, or the gauge symmetry is restored at a finite distance from the horizon and all particles become massless. If the conformal symmetry is spoiled, an additional term in the effective potential appears and the intermediate regime arises. Several normalization conditions fixing the undefined constants are proposed, and estimations for the mass shifts are given in these cases. It should be mentioned that the use of the one-loop approximation becomes questionable in the region where the one-loop effective potential acquires large values. So, in that region, we can believe in the obtained results to a certain extent only.

A convincing detection of primordial non-Gaussianity in the local form of the bispectrum, whose amplitude is given by the \fnl parameter, offers a powerful test of inflation. In this paper we calculate the modification of two-point cross-correlation statistics of weak lensing - galaxy-galaxy lensing and galaxy-Cosmic Microwave Background (CMB) cross-correlation - due to \fnl. We derive and calculate the covariance matrix of galaxy-galaxy lensing including cosmic variance terms. We focus on large scales (l < 100) for which the shape noise of the shear measurement becomes irrelevant and cosmic variance dominates the error budget. For a modest degree of non-Gaussianity, \fnl = 50, modifications of the galaxy-galaxy lensing signal at the 10% level are seen on scales R ~ 300nbsp;Mpc, and grow rapidly toward larger scales as R2. We also see a clear signature of the baryonic acoustic oscillation feature in the matter power spectrum at ~ 150nbsp;Mpc, which can be measured by next-generation lensing experiments. In addition we can probe the local-form primordial non-Gaussianity in the galaxy-CMB lensing signal by correlating the lensing potential reconstructed from CMB with high-z galaxies. For example, for \fnl = 50, we find that the galaxy-CMB lensing cross power spectrum is modified by ~ 10% at l ~ 40, and by a factor of two at l ~ 10, for a population of galaxies at z=2 with a bias of 2. The effect is greater for more highly biased populations at larger z; thus, high-z galaxy surveys cross-correlated with CMB offer a yet another probe of primordial non-Gaussianity.

The coupling of the Higgs fieldthrough the Ricci tensor, put forward by Balakrishna and Wali, is derived using a conformal rescaling of the metric. Earlier results on "Bogomolny-type" equations in curved space, by Comtet, and others, are recovered. The procedure can be generalized to any static background metric.

We give a detailed account of the construction of non-trivial localized solutions in a 2+1 dimensional model of superconductors using a 3+1 dimensional gravitational dual theory of a black hole coupled to a scalar field. The solutions are found in the presence of a background magnetic field. We use numerical and analytic techniques to solve the full Maxwell-scalar equations of motion in the background geometry, finding condensate droplet solutions, and vortex solutions possessing a conserved winding number. These solutions and their properties, which we uncover, help shed light on key features of the (B,T) phase diagram.

We determine a constraint on the growth factor by measuring the damping of the baryon acoustic oscillations in the matter power spectrum using the Sloan Digital Sky Survey luminous red galaxy sample. We obtain an effective upper limit on s8D1(z=0.3) using the damping of the baryon acoustic oscillation signature, where s8 is the root mean square overdensity in a sphere of radius 8h-1Mpc and D1(z) is the growth factor at redshift z. The above result assumes that other parameters are fixed and the cosmology is taken to be a spatially flat cold dark matter universe with the cosmological constant.