Phantom without phantom or how the PT symmetry saves us from the Big Rip

Details Phantom without phantom or how the PT symmetry saves us from the Big Rip Phantom without phantom or how the PT symmetry saves us from the Big Rip

2008-10-28

arxiv.org/abs/0810.5076v2

International Journal of Modern Physics D 19, 97-111 (2010)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

revised and enlarged version, to be published in Int. J. Mod. Phys. D, the title is changed

Scientific paper

10.1142/S0218271810016269

We consider the PT symmetric flat Friedmann model of two scalar fields with positive kinetic terms. While the potential of one ("normal") field is taken real, that of the other field is complex. We study a complex classical solution of the system of the two Klein-Gordon equations together with the Friedmann equation. The solution for the normal field is real while the solution for the second field is purely imaginary, realizing classically the "phantom" behavior. The energy density and pressure are real and the corresponding geometry is well-defined. The Lagrangian for the linear perturbations has the correct potential signs for both the fields, so that the problem of stability does not arise. The background dynamics is determined by an effective action including two real fields one normal and one "phantom". Remarkably, the phantom phase in the cosmological evolution is transient and the Big Rip never occurs. Our model is contrasted to well-known quintom models, which also include one normal and one phantom fields.

Affiliated with

Also associated with

No associations

Rating

Phantom without phantom or how the PT symmetry saves us from the Big Rip does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Phantom without phantom or how the PT symmetry saves us from the Big Rip, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phantom without phantom or how the PT symmetry saves us from the Big Rip will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-486135