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Bouncing Cosmological Isotropic Solutions in Scalar-Tensor Gravity
D. Polarski, A. A. Starobinsky, Y. Verbin
Bouncing non-singular isotropic cosmological solutions are investigated in a simple model of scalar-tensor gravity. New families of such solutions are found and their properties ar…
Weak gravity on a CDM background
Radouane Gannouji, Leandros Perivolaropoulos, David Polarski +1
We consider Horndeski modified gravity models obeying stability, velocity of gravitational waves equals and quasistatic approximation (QSA) on subhorizon scales. We assum…
Consistency of Modified Gravity with a decreasing in a CDM background
Radouane Gannouji, Lavrentios Kazantzidis, Leandros Perivolaropoulos +1
Recent analyses \cite{Nesseris:2017vor,Kazantzidis:2018rnb} have indicated that an effective Newton's constant decreasing with redshift may relieve the observed te…
Bouncing Universes in Scalar-Tensor Gravity Around Conformal Invariance
B. Boisseau, H. Giacomini, D. Polarski
We consider the possibility to produce a bouncing universe in the framework of scalar-tensor gravity when the scalar field has a nonconformal coupling to the Ricci scalar. We prove…
Scalar Field Cosmologies With Inverted Potentials
B. Boisseau, H. Giacomini, D. Polarski
Regular bouncing solutions in the framework of a scalar-tensor gravity model were found in a recent work. We reconsider the problem in the Einstein frame (EF) in the present work.…
Bouncing Universes in Scalar-Tensor Gravity Models admitting Negative Potentials
B. Boisseau, H. Giacomini, D. Polarski +1
We consider the possibility to produce a bouncing universe in the framework of scalar-tensor gravity models in which the scalar field potential may be negative, and even unbounded…