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Speaker |
Patel, Avani |
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Coauthors |
Dutta, Koushik; Panda Sukanta; Patel, Avani |
| Talk Title |
Curvature Singularity in f(R) Theories of Gravity |
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Abstract |
In this 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 pressure less contracting dust can easily lead to the curvature singularity, making these theories nonviable. |
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