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New Class of Quasinormal Modes of Neutron Stars in Scalar-Tensor Gravity.

Authors
  • Mendes, Raissa F P1
  • Ortiz, Néstor2
  • 1 Instituto de Física, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza s/n, Gragoatá, 24210-346 Niterói, Rio de Janeiro, Brazil. , (Brazil)
  • 2 Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5, Canada. , (Canada)
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
May 18, 2018
Volume
120
Issue
20
Pages
201104–201104
Identifiers
DOI: 10.1103/PhysRevLett.120.201104
PMID: 29864365
Source
Medline
License
Unknown

Abstract

Detection of the characteristic spectrum of pulsating neutron stars can be a powerful tool not only to probe the nuclear equation of state but also to test modifications to general relativity. However, the shift in the oscillation spectrum induced by modified theories of gravity is often small and degenerate with our ignorance of the equation of state. In this Letter, we show that the coupling to additional degrees of freedom present in modified theories of gravity can give rise to new families of modes, with no counterpart in general relativity, which could be sufficiently well resolved in frequency space to allow for clear detection. We present a realization of this idea by performing a thorough study of radial oscillations of neutron stars in massless scalar-tensor theories of gravity. We anticipate astrophysical scenarios where the presence of this class of quasinormal modes could be probed with electromagnetic and gravitational wave measurements.

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