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.

No Evidence of Kinetic Screening in Simulations of Merging Binary Neutron Stars beyond General Relativity / Bezares, Miguel; Aguilera-Miret, Ricard; ter Haar, Lotte; Crisostomi, Marco; Palenzuela, Carlos; Barausse, Enrico. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 128:9(2022), pp. 0911031-0911036. [10.1103/PhysRevLett.128.091103]

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

Bezares, Miguel;Crisostomi, Marco;Barausse, Enrico
2022-01-01

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.
2022
128
9
0911031
0911036
10.1103/PhysRevLett.128.091103
https://arxiv.org/abs/2107.05648
Bezares, Miguel; Aguilera-Miret, Ricard; ter Haar, Lotte; Crisostomi, Marco; Palenzuela, Carlos; Barausse, Enrico
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/126589
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