Scalar perturbations in nonsingular universes from interacting vacuum
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DOI: 10.1088/1361-6382/ad494d
Abstract: In this paper we examine the stability of scalar perturbations in nonsingular models which emerge from an interacting vacuum component. The analysis developed in this paper relies on two phenomenological choices for the energy exchange… read more here.
Keywords: interacting vacuum; vacuum; nonsingular universes; universes interacting ... See more keywords
Correlated scalar perturbations and gravitational waves from axion inflation
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DOI: 10.1088/1475-7516/2024/10/024
Abstract: The scalar and tensor fluctuations generated during inflation can be correlated, if arising from the same underlying mechanism. In this paper we investigate such correlation in the model of axion inflation, where the rolling inflaton… read more here.
Keywords: axion inflation; correlated scalar; gravitational waves; scalar perturbations ... See more keywords
Preinflationary scalar perturbations on closed universes in loop quantum cosmology
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DOI: 10.1103/physrevd.110.103531
Abstract: The inflationary and pre-inflationary evolution of scalar modes of cosmological perturbations in a closed universe is analyzed for a loop quantum cosmology model with an inflationary regime consistent with the constraints on inflation derived from… read more here.
Keywords: preinflationary scalar; scalar perturbations; cosmology; loop quantum ... See more keywords
Massive scalar perturbations in Kerr black holes: Near extremal analysis
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DOI: 10.1103/physrevd.110.124064
Abstract: We study quasinormal modes of massive scalar perturbations in Kerr black holes using the isomonodromic method. For arbitrary scalar masses $M \mu$ and black hole spins $a/M$, we numerically determine the quasinormal frequencies for various… read more here.
Keywords: perturbations kerr; massive scalar; scalar perturbations; kerr black ... See more keywords