Fully stable cosmological solutions with a nonsingular classical bounce
Recently, we 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 NECsatisfying phase without encountering any singularities or pathologies. One drawback of these examples is that singular behavior is encountered at some time either just before or just after the NECviolating 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 L _{4} Galileon interaction. In using this approach, we construct nonsingular classical bouncing cosmological solutions that are nonpathological for all times.
 Authors:

^{[1]};
^{[2]}
 Princeton Univ., NJ (United States). Princeton Center for Theoretical Science
 Princeton Univ., NJ (United States). Princeton Center for Theoretical Science and Dept. of Physics
 Publication Date:
 Grant/Contract Number:
 FG0291ER40671
 Type:
 Published Article
 Journal Name:
 Physics Letters. Section B
 Additional Journal Information:
 Journal Volume: 764; Journal Issue: C; Journal ID: ISSN 03702693
 Publisher:
 Elsevier
 Research Org:
 Princeton Univ., NJ (United States)
 Sponsoring Org:
 USDOE
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS; Bouncing cosmology; Nonsingular bounce; Galileon; Ghost instability; Gradient instability
 OSTI Identifier:
 1333750
 Alternate Identifier(s):
 OSTI ID: 1366489
Ijjas, Anna, and Steinhardt, Paul J. Fully stable cosmological solutions with a nonsingular classical bounce. United States: N. p.,
Web. doi:10.1016/j.physletb.2016.11.047.
Ijjas, Anna, & Steinhardt, Paul J. Fully stable cosmological solutions with a nonsingular classical bounce. United States. doi:10.1016/j.physletb.2016.11.047.
Ijjas, Anna, and Steinhardt, Paul J. 2016.
"Fully stable cosmological solutions with a nonsingular classical bounce". United States.
doi:10.1016/j.physletb.2016.11.047.
@article{osti_1333750,
title = {Fully stable cosmological solutions with a nonsingular classical bounce},
author = {Ijjas, Anna and Steinhardt, Paul J.},
abstractNote = {Recently, we 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 NECsatisfying phase without encountering any singularities or pathologies. One drawback of these examples is that singular behavior is encountered at some time either just before or just after the NECviolating 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 L4 Galileon interaction. In using this approach, we construct nonsingular classical bouncing cosmological solutions that are nonpathological for all times.},
doi = {10.1016/j.physletb.2016.11.047},
journal = {Physics Letters. Section B},
number = C,
volume = 764,
place = {United States},
year = {2016},
month = {11}
}