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2011

Antigravity and the big crunch/big bang transition

Bars, Itzhak, Chen, Shih-Hung, Steinhardt, Paul J. et al.

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We point out a new phenomenon which seems to be generic in 4d effective theories of scalar fields coupled to Einstein gravity, when applied to cosmology.

A lift of such theories to a Weyl-invariant extension allows one to define classical evolution through cosmological singularities unambiguously, and hence construct geodesically complete background spacetimes.
An attractor mechanism ensures that, at the level of the effective theory, generic solutions undergo a big crunch/big bang transition by contracting to zero size, passing through a brief antigravity phase, shrinking to zero size again, and re-emerging into an expanding normal gravity phase.
The result may be useful for the construction of complete bouncing cosmologies like the cyclic model.

Antigravity and the big crunch/big bang transition · Around

Built on

A. H. Guth, Phys. Rev. D
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B. de Wit and A. Van Proeyen, Nucl. Phys. B
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This is most easily seen in the adiabatic regularization method of Parker and Fulling reviewed, for example, in N. D. Birrell and P .C. Davies, Quantum Fields in Curved Space
1986
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See for example Eq.(31.6.62) in S. Weinberg, The Quantum Theory of Fields
2000
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J. Khoury, B. A. Ovrut, P. J. Steinhardt and N. Turok, Phys. Rev. D
2001
Earlier work this paper cites.

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I. Bars, arXiv:1109.5872
Original
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Then

I. Bars, Phys. Rev. D
Original
2008
Later among the works it cites.
I. Bars and S.-H. Chen, Phys. Rev. D
Original
2009
Later among the works it cites.
For discussions, see P. J. Steinhardt, Sci. Am
2011
Closest in time.
I. Bars and S-H. Chen, Phys. Rev. D
2011
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I. Bars, S-H. Chen and N. Turok, [arXiv:hep-th/1105.3606], Phys. Rev. D
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