Fully stable cosmological solutions with a non-singular classical bounce. (arXiv:1609.01253v5 [gr-qc] UPDATED)
<a href="http://arxiv.org/find/gr-qc/1/au:+Ijjas_A/0/1/0/all/0/1">Anna Ijjas</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Steinhardt_P/0/1/0/all/0/1">Paul J. Steinhardt</a>
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.
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.
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