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Phys. Rev. D 65, 107702 (2002) [4 pages]

Breaking CPT by mixed noncommutativity

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Irina Mocioiu*
C.N. Yang Institute for Theoretical Physics, State University of New York, Stony Brook, New York 11794-3840

Maxim Pospelov†
Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, 116 Church Street, Minneapolis, Minnesota 55455

Radu Roiban‡
C.N. Yang Institute for Theoretical Physics, State University of New York, Stony Brook, New York 11794-3840

Received 21 August 2001; published 9 May 2002

The mixed component of the noncommutative parameter θμM, where μ=0,1,2,3 and M is an extra dimensional index, may violate four-dimensional CPT invariance. We calculate one- and two-loop induced couplings of θμ5 with the four-dimensional axial vector current and with the CPT odd dim=6 operators starting from five-dimensional Yukawa and U(1) theories. The resulting bounds from clock comparison experiments place a stringent constraint on θμ5, |θμ5|-1/2≳5×1011 GeV. Orbifold projection and/or localization of fermions on a 3-brane lead to CPT-conserving physics, in which case the constraints on θμ5 are softened.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.65.107702
DOI:
10.1103/PhysRevD.65.107702
PACS:
11.30.Er, 02.40.Gh, 11.10.Kk

*Email address: mocioiu@insti.physics.sunysb.edu

†Email address: pospelov@mnhepw.hep.umn.edu

‡Email address: roiban@insti.physics.sunysb.edu

 
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