Boson stars in massless and massive scalar-tensor gravity
Abstract
We study phenomenological features and stability of boson stars in massless and massive scalar-tensor theory of gravity with Damour-Esposito-Farèse coupling. This coupling between the tensor and scalar sectors of the theory leads to a phenomenon called spontaneous scalarization, the onset of which we investigate by numerically computing families of boson-star models using shooting and relaxation algorithms. We systematically explore the effects of the theory's coupling, the mass of the gravitational scalar and the choice of the bosonic potential on the structure of weakly and strongly scalarized solutions. Scalarized boson-star models share many common features with neutron stars in the same scalar-tensor theory of gravity. In particular, scalarization can result in boson stars with significantly larger radii and masses, which tend to be energetically favored over their weakly or nonscalarized counterparts. Overall, we find that boson stars are not quite as susceptible to scalarization as neutron stars.
Copyright and License
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Acknowledgement
T. E. is supported by the Centre for Doctoral Training (CDT) at the University of Cambridge funded through STFC. R. R. M. acknowledges support by the Deutsche Forschungsgemeinschaft (DFG) under Grants No. 2176/7-1 and No. 406116891 within the Research Training Group RTG 2522/1. This work has been supported by STFC Research Grant No. ST/V005669/1 "Probing Fundamental Physics with Gravitational-Wave Observations." We acknowledge support by the DiRAC Project No. ACTP284 from the Cambridge Service for Data Driven Discovery (CSD3) system at the University of Cambridge and Cosma7 and 8 of Durham University through STFC capital Grants No. ST/P002307/1 and No. ST/R002452/1, and STFC operations Grant No. ST/R00689X/1. We also acknowledge support by the DiRAC project grant DiRAC Project ACTP238 for use of Cosma7 and DiAL3. This research project was conducted using computational resources at the Maryland Advanced Research Computing Center (MARCC). The authors acknowledge the Texas Advanced Computing Center (TACC) at The University of Texas at Austin and the San Diego Supercomputer Center for providing HPC resources that have contributed to the research results reported within this paper through NSF Grant No. PHY-090003 [108,109].
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Additional details
- ISSN
- 2470-0029
- University of Cambridge
- Deutsche Forschungsgemeinschaft
- 2176/7-1
- Deutsche Forschungsgemeinschaft
- 406116891
- Science and Technology Facilities Council
- ST/V005669/1
- Science and Technology Facilities Council
- ST/P002307/1
- Science and Technology Facilities Council
- ST/R002452/1
- Science and Technology Facilities Council
- ST/R00689X/1
- National Science Foundation
- PHY-090003
- Caltech groups
- TAPIR