TY - JOUR
T1 - Bounce and cyclic cosmology in new gravitational scalar-tensor theories
AU - Saridakis, Emmanuel N.
AU - Banerjee, Shreya
AU - Myrzakulov, R.
N1 - Funding Information:
This article is based upon work from COST Action “Cosmology and Astrophysics Network for Theoretical Advances and Training Actions,” supported by European Cooperation in Science and Technology.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/9/12
Y1 - 2018/9/12
N2 - We study the bounce and cyclicity realization in the framework of new gravitational scalar-tensor theories. In these theories, the Lagrangian contains the Ricci scalar and its first and second derivatives, in a specific combination that makes them free of ghosts, and transformed into the Einstein frame, they are proved to be a subclass of biscalar extensions of general relativity. We present analytical expressions for the bounce requirements, and we examine the necessary qualitative behavior of the involved functions that can give rise to a given scale factor. Having in mind these qualitative forms, we reverse the procedure, and we construct suitable simple Lagrangian functions that can give rise to a bounce or cyclic scale factor.
AB - We study the bounce and cyclicity realization in the framework of new gravitational scalar-tensor theories. In these theories, the Lagrangian contains the Ricci scalar and its first and second derivatives, in a specific combination that makes them free of ghosts, and transformed into the Einstein frame, they are proved to be a subclass of biscalar extensions of general relativity. We present analytical expressions for the bounce requirements, and we examine the necessary qualitative behavior of the involved functions that can give rise to a given scale factor. Having in mind these qualitative forms, we reverse the procedure, and we construct suitable simple Lagrangian functions that can give rise to a bounce or cyclic scale factor.
UR - http://www.scopus.com/inward/record.url?scp=85054579413&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.98.063513
DO - 10.1103/PhysRevD.98.063513
M3 - Article
AN - SCOPUS:85054579413
SN - 2470-0010
VL - 98
JO - Physical Review D
JF - Physical Review D
IS - 6
M1 - 063513
ER -