TY - Journal Article
T1 - UNIVERSE IN A BLACK HOLE IN EINSTEIN-CARTAN GRAVITY
JF - The Astrophysical journal
VL - 832
IS - 2
SP - 96
EP - 103
A1 - Pop awski, Nikodem
CY - BRISTOL
PB - The American Astronomical Society
PY - 2016
UR - https://bonnus.ulb.uni-bonn.de/SummonRecord/FETCH-LOGICAL-1390t-d093195144e6ae4bec257e43c87df8bec98511d7140be1674cef79e04b22f2340
N2 - ABSTRACT The conservation law for the angular momentum in curved spacetime, consistent with relativistic quantum mechanics, requires that the antisymmetric part of the affine connection (torsion tensor) is a variable in the principle of least action. The coupling between the spin of elementary particles and torsion in the Einstein-Cartan theory of gravity generates gravitational repulsion at extremely high densities in fermionic matter, approximated as a spin fluid, and thus avoids the formation of singularities in black holes. The collapsing matter in a black hole should therefore bounce at a finite density and then expand into a new region of space on the other side of the event horizon, which may be regarded as a nonsingular, closed universe. We show that quantum particle production caused by an extremely high curvature near a bounce can create enormous amounts of matter, produce entropy, and generate a finite period of exponential expansion (inflation) of this universe. This scenario can thus explain inflation without a scalar field and reheating. We show that, depending on the particle production rate, such a universe may undergo several nonsingular bounces until it has enough matter to reach a size at which the cosmological constant starts cosmic acceleration. The last bounce can be regarded as the big bang of this universe.
KW - APPROXIMATIONS
KW - Astronomy & Astrophysics
KW - ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
KW - black hole physics
KW - BLACK HOLES
KW - COSMOLOGICAL CONSTANT
KW - COSMOLOGICAL INFLATION
KW - COSMOLOGY
KW - cosmology: theory
KW - COUPLING
KW - early universe
KW - ENTROPY
KW - FERMIONS
KW - GRAVITATION
KW - GRAVITATIONAL COLLAPSE
KW - inflation
KW - PARTICLE PRODUCTION
KW - Physical Sciences
KW - QUANTUM MECHANICS
KW - RELATIVISTIC RANGE
KW - SCALAR FIELDS
KW - Science & Technology
KW - SINGULARITY
KW - SPACE-TIME
KW - SPIN
KW - TENSORS
KW - UNIVERSE
KW - GENERAL-RELATIVITY
KW - SPIN
KW - EXPANDING UNIVERSES
KW - inflation
KW - INFLATIONARY UNIVERSE
KW - cosmology: theory
KW - DIRAC PARTICLES
KW - QUANTIZED-FIELDS
KW - early universe
KW - LORENTZ INVARIANCE
KW - black hole physics
KW - gravitation
KW - COSMOLOGICAL PERTURBATIONS
KW - CREATION
KW - SPACE-TIME TORSION
ER -