Speaker
Ms
Avani Patel
(IISER Bhopal)
Description
In this Poster/talk, I will be discussing the problem of Curvature Singularity which arises
in f(R) theories. The f(R) Theory is a modification of gravitational theory compared to
Einstein’s General Relativity. In these theories, we try to modify gravitational lagrangian
by adding higher order curvature corrections without spoiling successes of GR.
Even though f (R) modifications of late time cosmology is successful in explaining the
cosmic acceleration, it is very difficult to simultaneously satisfy the fifth-force constraint.
Even in this case, the effective scalar degree of freedom may move to a point (close to
its minima) in the field space where the Ricci scalar diverges. We elucidate this point
further with a specific example of f (R) gravity that incorporates all viable f (R) gravity
models in the literature. In particular, we show that the nonlinear evolution of the field
in pressureless contracting dust can easily lead to the curvature singularity, making these
theories nonviable.
Author
Ms
Avani Patel
(IISER Bhopal)
