Instabilities of Scalar Fields around Oscillating Stars

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The behavior of fundamental fields in strong gravity or nontrivial environments is important for our understanding of nature. This problem has interesting applications in the context of dark matter, of dark energy physics, or of quantum field theory. The dynamics of fundamental fields has been studied mainly in static or stationary backgrounds, whereas most of our Universe is dynamic. In this Letter we investigate "blueshift" and parametric instabilities of scalar fields in dynamical backgrounds, which can be triggered (for instance) by oscillating stars in scalar-tensor theories of gravity. We discuss possible implications of our results, which include constraints on an otherwise hard-to-access parameter space of scalar-tensor theories.

Original languageEnglish
Article number191101
JournalPhysical Review Letters
Volume127
Issue number19
Number of pages7
ISSN0031-9007
DOIs
Publication statusPublished - 5 Nov 2021

    Research areas

  • RADIAL OSCILLATIONS, NORMAL-MODES, GRAVITY, WAVES

ID: 285309954