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Fully stable cosmological solutions with a non-singular classical bounce

Anna Ijjas
(
- Princeton U., PCTS
)
,
Paul J. Steinhardt
(
- Princeton U. and
- Princeton U., PCTS
)

Sep 5, 2016

6 pages

Published in:

Phys.Lett.B 764 (2017) 289-294

Published: Jan 10, 2017

e-Print:

1609.01253 [gr-qc]

DOI:

10.1016/j.physletb.2016.11.047 (publication)

View in:

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Abstract: (Elsevier)

We recently showed how it is possible to use a cubic Galileon action to construct classical cosmological solutions that enter a contracting null energy condition (NEC) violating phase, bounce at finite values of the scale factor and exit into an expanding NEC-satisfying phase without encountering any singularities or pathologies. A drawback of these examples is that singular behavior is encountered at some time either just before or just after the NEC-violating phase. In this Letter, we show that it is possible to circumvent this problem by extending our method to actions that include the next order L4 Galileon interaction. Using this approach, we construct non-singular classical bouncing cosmological solutions that are non-pathological for all times.

Note:

6 pages, 4 figures. Version 5 contains minor corrections to coefficients in the first paragraph of Sec. 5 and to the labeling in Fig 2

Bouncing cosmology
Non-singular bounce
Galileon
Ghost instability
Gradient instability
stability
Galileon
bounce
null-energy condition: violation
cosmological model

References(16)

Figures(3)

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(to appear). 6

A. Ijjas