New non-singular cosmological solution of non-local gravity
| Autor: | Kolář, Ivan, Torralba, Francisco José Maldonado, Mazumdar, Anupam |
|---|---|
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 105, 044045 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.105.044045 |
| Popis: | We present a new bouncing cosmological solution of the non-local theory known as infinite derivative gravity, which goes beyond the recursive ansatz, ${\Box R = r_1 R +r_2}$. The non-local field equations are evaluated using the spectral decomposition with respect to the eigenfunctions of the wave operator. The energy-momentum tensor computed for this geometry turns out to be much more sensitive to the choice of the non-local form-factor, since it depends on the value of the function on a continuous infinite interval. We show that this stronger dependence on the form-factor allows us to source the geometry by the perfect fluid with the non-negative energy density satisfying the strong energy condition. We show that this bouncing behaviour is not possible in the local theories of gravity such as in general relativity or $R+R^2$ gravity sourced by a fluid which meets the non-negative energy and strong energy conditions. Comment: 12 pages |
| Databáze: | arXiv |
| Externí odkaz: |
|