No Evidence of Kinetic Screening in Simulations of Merging Binary Neutron Stars beyond General Relativity

Miguel Bezares, Ricard Aguilera-Miret, Lotte ter Haar, Marco Crisostomi, Carlos Palenzuela, and Enrico Barausse
Phys. Rev. Lett. 128, 091103 – Published 1 March 2022
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Abstract

We have conducted fully relativistic simulations in a class of scalar-tensor theories with derivative self-interactions and screening of local scales. By using high-resolution shock-capturing methods and a nonvanishing shift vector, we have managed to avoid issues plaguing similar attempts in the past. We have first confirmed recent results by ourselves in spherical symmetry, obtained with an approximate approach and pointing at a partial breakdown of the screening in black-hole collapse. Then, we considered the late inspiral and merger of binary neutron stars. We found that screening tends to suppress the (subdominant) dipole scalar emission, but not the (dominant) quadrupole scalar mode. Our results point at quadrupole scalar signals as large as (or even larger than) in Fierz-Jordan-Brans-Dicke theories with the same conformal coupling, for strong-coupling scales in the MeV range that we can simulate.

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  • Received 13 July 2021
  • Accepted 19 January 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.091103

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Miguel Bezares1,2, Ricard Aguilera-Miret3,4, Lotte ter Haar1,2, Marco Crisostomi1,2, Carlos Palenzuela3,4, and Enrico Barausse1,2

  • 1SISSA, Via Bonomea 265, 34136 Trieste, Italy and INFN Sezione di Trieste, 34136 Trieste, Italy
  • 2IFPU—Institute for Fundamental Physics of the Universe, Via Beirut 2, 34014 Trieste, Italy
  • 3Departament de Física, Universitat de les Illes Balears and Institut d’Estudis Espacials de Catalunya, Palma de Mallorca, Baleares E-07122, Spain
  • 4Institut Aplicacions Computationals (IAC3), Universitat de les Illes Balears, Palma de Mallorca, Baleares E-07122, Spain

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Issue

Vol. 128, Iss. 9 — 4 March 2022

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