5-10 July 2021
Europe/Rome timezone

Universe in a black hole with spin and torsion

8 Jul 2021, 18:20
20m
Talk in the parallel session Black Holes in alternative theories of gravity Black Holes in Alternative Theories of Gravity

Speaker

Nikodem Poplawski (University of New Haven)

Description

We consider gravitational collapse of a spherically symmetric sphere of a fluid with spin and torsion into a black hole. We use the Tolman metric and the Einstein-Cartan field equations with a relativistic spin fluid as a source. We show that gravitational repulsion of torsion prevents a singularity and replaces it with a nonsingular bounce. Quantum particle production during contraction strengthens torsion in opposing shear. Particle production during expansion can produce enormous amounts of matter and generate a finite period of inflation. The resulting closed universe on the other side of the event horizon may have several bounces. Such a universe is oscillatory, with each cycle larger in size then the previous cycle, until it reaches the cosmological size and expands indefinitely. Our universe might have therefore originated from a black hole existing in another universe.

Primary author

Nikodem Poplawski (University of New Haven)

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