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Paper   IPM / Astronomy / 14695
School of Astronomy
  Title:   Primordial Universe Inside the Black Hole and Inflation
  Author(s):  Hassan. Firouzjahi
  Status:   Published
  Journal: arXiv
  Year:  2016
  Pages:   23
  Supported by:            ipm IPM
We speculate that the early Universe was inside a primordial black hole. The interior of the the black hole is a dS background and the two spacetimes are separated on the surface of black hole's event horizon. We argue that this picture provides a natural realization of inflation without invoking the inflaton field. The black hole evaporation by Hawking radiation provides a natural mechanism for terminating inflation so reheating and the hot big bang cosmology starts from the evaporation of black hole to relativistic particles. The quantum gravitational fluctuations at the boundary of black hole generate the nearly scale invariant scalar and tensor perturbations with the ratio of tensor to scalar power spectra at the order of 10�??310�??3. As the black hole evaporates, the radius of its event horizon shrinks and the Hubble expansion rate during inflation increases slowly so the quantum Hawking radiation provides a novel mechanism for the violation of null energy condition in cosmology.

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