Greybody factors and quasinormal modes for a nonminimally coupled scalar field in a cloud of strings in (2 + 1)-dimensional background

ANGEL RINCON RIVERO, Grigoris Panotopoulos

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Abstract

We study the propagation of a probe massless nonminimally coupled scalar field in a fixed gravitational background of a cloud of strings in (2 + 1) dimensions. We obtain exact analytical expressions for the reflection coefficient, the absorption cross section, the decay rate as well as the quasinormal frequencies. The impact of the nonminimal coupling is investigated in detail. Our results show that universality is not respected in general, and that scalar perturbations are stable.

Original languageEnglish
Article number858
JournalEuropean Physical Journal C
Volume78
Issue number10
DOIs
StatePublished - 1 Oct 2018

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