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A covariant Lagrangian for stable nonsingular bounce

Yong Cai
(
- Beijing, GUCAS
)
,
Yun-Song Piao
(
- Beijing, GUCAS and
- Beijing, Inst. Theor. Phys.
)

May 9, 2017

9 pages

Published in:

JHEP 09 (2017) 027

Published: Sep 7, 2017

e-Print:

1705.03401 [gr-qc]

DOI:

10.1007/JHEP09(2017)027

View in:

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Abstract: (Springer)

The nonsingular bounce models usually suffer from the ghost or gradient instabilities, as has been proved recently. In this paper, we propose a covariant effective theory for stable nonsingular bounce, which has the quadratic order of the second order derivative of the field ϕ but the background set only by P (ϕ, X). With it, we explicitly construct a fully stable nonsingular bounce model for the ekpyrotic scenario.

Note:

12 pages, 6 figures; published in JHEP; an Appendix and references added

Classical Theories of Gravity
Spacetime Singularities
covariance
stability
bounce
effective field theory
cosmological model
mathematical methods
field equations
ekpyrotic

References(60)

Figures(6)

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