Phys. Rev. D 69, 123520 (2004) [8 pages]Coupled oscillators as models of phantom and scalar field cosmologiesReceived 8 March 2004; published 28 June 2004 We study a toy model for phantom cosmology recently introduced in the literature and consisting of two oscillators, one of which carries negative kinetic energy. The results are compared with the exact phase space picture obtained for similar dynamical systems describing, respectively, a massive canonical scalar field conformally coupled to the spacetime curvature and a conformally coupled massive phantom. Finally, the dynamical system describing exactly a minimally coupled phantom is studied and compared with the toy model. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.69.123520
DOI:
10.1103/PhysRevD.69.123520
PACS:
98.80.Cq, 95.30.Sf, 95.35.+d
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