24-26 September 2020
Lima, Perú
America/Lima timezone
Share our event through the following link: https://indico.uni.edu.pe/e/Meeting-of-Physics

Universe in a black hole with spin and torsion

25 Sep 2020, 11:00
30m
Lima, Perú

Lima, Perú

Centro de Investigación de la Facultad de Ciencias Universidad Nacional de Ingeniería
video conference General relativity and Field theory keynote talks

Speaker

Dr Nikodem Poplawski (University of New Haven)

Description

The conservation law for the total (orbital and spin) angular momentum of a Dirac particle in the presence of gravity requires that spacetime is not only curved, but also has a nonzero torsion.
The coupling between the spin and torsion in the Einstein-Cartan theory of gravity generates gravitational repulsion at extremely high densities.
We consider gravitational collapse of a spin-fluid sphere into a black hole.
We show that a singularity is replaced with a nonsingular bounce if there is no shear.
We also show that torsion and quantum particle production during contraction avoid a singularity even if shear is present.
Particle production during expansion can generate a finite period of inflation and produce enormous amounts of matter.
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.

Primary author

Dr Nikodem Poplawski (University of New Haven)

Presentation Materials

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