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2016

Fully stable cosmological solutions with a non-singular classical bounce

Ijjas, Anna, Steinhardt, Paul J.

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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 ${\cal L}_4$ Galileon interaction.
Using this approach, we construct non-singular classical bouncing cosmological solutions that are non-pathological for all times.

Fully stable cosmological solutions with a non-singular classical bounce · Around

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