Late-time Cosmic Acceleration from Compactification - INSPIRE

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Late-time Cosmic Acceleration from Compactification

J.G. Russo
(
- ICREA, Barcelona and
- ICC, Barcelona U.
)
,
P.K. Townsend
(
- Liverpool U. and
- Cambridge U., DAMTP
)

Nov 8, 2018

19 pages

Published in:

Class.Quant.Grav. 36 (2019) 9, 095008

Published: Apr 8, 2019

e-Print:

1811.03660 [hep-th]

DOI:

10.1088/1361-6382/ab0804

Report number:

ICCUB-18-020

View in:

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Abstract: (IOP)

We investigate the implications of energy conditions on cosmological compactification solutions of the higher-dimensional Einstein field equations. It is known that the strong energy condition forbids time-independent compactifications to de Sitter space but allows time-dependent compactifications to other (homogeneous and isotropic) expanding universes that undergo a transient period of acceleration. Here we show that the same assumptions allow compactification to FLRW universes undergoing late-time accelerated expansion; the late-time stress tensor is a perfect fluid but with a lower bound on the pressure/energy-density ratio that excludes de Sitter but allows accelerated power-law expansion. The compact space undergoes a decelerating expansion that leads to decompactification, but on an arbitrarily long timescale.

Note:

23 pages. New subsections and references added

cosmology
compactification
energy conditions
expansion: acceleration
space: de Sitter
space: compact
compactification
strong-energy condition
higher-dimensional
Einstein equation

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Figures(1)

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