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Article

Structure of Neutron Stars in Massive Scalar-Tensor Gravity

1
DAMTP, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UK
2
School of Physics and Astronomy & Institute for Gravitational Wave Astronomy, University of Birmingham, Birmingham B15 2TT, UK
3
TAPIR 350-17, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA
4
Kavli Institute for Cosmology Cambridge, Madingley Road, Cambridge CB3 0HA, UK
*
Author to whom correspondence should be addressed.
Symmetry 2020, 12(9), 1384; https://doi.org/10.3390/sym12091384
Received: 23 July 2020 / Revised: 10 August 2020 / Accepted: 14 August 2020 / Published: 19 August 2020
(This article belongs to the Special Issue Numerical Relativity and Gravitational Wave)
We compute families of spherically symmetric neutron-star models in two-derivative scalar-tensor theories of gravity with a massive scalar field. The numerical approach we present allows us to compute the resulting spacetimes out to infinite radius using a relaxation algorithm on a compactified grid. We discuss the structure of the weakly and strongly scalarized branches of neutron-star models thus obtained and their dependence on the linear and quadratic coupling parameters α0, β0 between the scalar and tensor sectors of the theory, as well as the scalar mass μ. For highly negative values of β0, we encounter configurations resembling a “gravitational atom”, consisting of a highly compact baryon star surrounded by a scalar cloud. A stability analysis based on binding-energy calculations suggests that these configurations are unstable and we expect them to migrate to models with radially decreasing baryon density and scalar field strength. View Full-Text
Keywords: modified gravity; scalar-tensor theory; compact objects; relativistic astrophysics modified gravity; scalar-tensor theory; compact objects; relativistic astrophysics
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MDPI and ACS Style

Rosca-Mead, R.; Moore, C.J.; Sperhake, U.; Agathos, M.; Gerosa, D. Structure of Neutron Stars in Massive Scalar-Tensor Gravity. Symmetry 2020, 12, 1384. https://doi.org/10.3390/sym12091384

AMA Style

Rosca-Mead R, Moore CJ, Sperhake U, Agathos M, Gerosa D. Structure of Neutron Stars in Massive Scalar-Tensor Gravity. Symmetry. 2020; 12(9):1384. https://doi.org/10.3390/sym12091384

Chicago/Turabian Style

Rosca-Mead, Roxana, Christopher J. Moore, Ulrich Sperhake, Michalis Agathos, and Davide Gerosa. 2020. "Structure of Neutron Stars in Massive Scalar-Tensor Gravity" Symmetry 12, no. 9: 1384. https://doi.org/10.3390/sym12091384

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