Anisotropic nonsingular quantum bounce as a seesaw and amplification mechanism for magnetic fields - INSPIRE

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Anisotropic nonsingular quantum bounce as a seesaw and amplification mechanism for magnetic fields

Meysam Motaharfar
(
- Louisiana State U.
)
,
Parampreet Singh
(
- Louisiana State U. and
- CCT, Baton Rouge
)

Jun 14, 2024

21 pages

Published in:

Phys.Rev.D 110 (2024) 8, 086020

Published: Oct 15, 2024

e-Print:

2406.10351 [gr-qc]

DOI:

10.1103/PhysRevD.110.086020 (publication)

View in:

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Abstract: (APS)

We investigate the evolution of a homogeneous magnetic field within Bianchi-I loop quantum cosmology, in which the big bang singularity is replaced with an anisotropic quantum bounce. Using effective spacetime description, we conduct extensive numerical simulations with randomized initial conditions for two cases: first in the presence of a pure homogeneous magnetic field and then adding a massless scalar field that effectively captures the bounce regime even in the presence of inflationary potentials. For a cigarlike approach to the classical big bang, which is far more prevalent than a pointlike approach, the nonsingular bounce acts as a seesaw mechanism for magnetic field energy density. Because of the seesaw mechanism, the magnetic field energy density gets amplified by several orders of magnitude across the bounce for a small prebounce value of magnetic field energy density, or vice versa. In the presence of the scalar field, the seesaw mechanism is completely replaced by amplification of the magnetic field across the bounce when the initial energy density of the scalar field significantly dominates. When the universe has a pointlike approach to the classical big bang, the seesaw mechanism is absent, and magnetic field energy density experiences amplification or suppression across the nonsingular bounce depending on initial densities.

Note:

26 pages, 13 figures

References(98)

Figures(22)

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