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Modern topics in black hole physics and cosmology / FRANCESCO FILIPPINI

Swansea University Author: FRANCESCO FILIPPINI

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DOI (Published version): 10.23889/SUthesis.56800

Abstract

Motivated by the new opportunities that gravitational wave detections of-fer in both cosmology and astrophysics, in this thesis we study potentially detectable physical phenomena related with black hole physics, with partic-ular interest to systems of black holes interacting with cosmological scalar...

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Published: Swansea 2020
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Tasinato, Gianmassimo
URI: https://cronfa.swan.ac.uk/Record/cronfa56800
first_indexed 2021-05-05T12:22:24Z
last_indexed 2021-05-06T03:23:01Z
id cronfa56800
recordtype RisThesis
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spelling 2021-05-05T14:14:16.7683708 v2 56800 2021-05-05 Modern topics in black hole physics and cosmology c68d82e7e98906dd2acb0a74842121be FRANCESCO FILIPPINI FRANCESCO FILIPPINI true false 2021-05-05 Motivated by the new opportunities that gravitational wave detections of-fer in both cosmology and astrophysics, in this thesis we study potentially detectable physical phenomena related with black hole physics, with partic-ular interest to systems of black holes interacting with cosmological scalar fields.First of all, we study a charged, rotating black hole solution in a Gener-alised Proca theory of gravity, obtained through a disformal transformation of the Einstein-Maxwell action. Due to the breaking of gauge symmetry, the gauge freedom of the components of the gauge vector is lost; thus, for a particular choice of the gauge vector, we are able to find an exact, charged, rotating black hole solution, with event horizon and ergosphere parametri-cally different from the General Relativity solution. For such solution, the Innermost Stable Circular Orbits (ISCOs) are studied. Subsequently, we consider the effects of an external, ultralight scalar field interacting with an electromagnetic Kerr-Newman black hole. Depending on the frequen-cies of the scalar’s modes and on the angular velocity of the black hole, the scalar waves scattering off the event horizon may trigger superradiance; for some scalar field’s modes, a stationary scalar cloud is developed in the black hole’s surroundings, and the frequencies of the scalar’s modes in the cloud correspond to the resonant frequencies of the superradiant gain fac-tor. Moreover, we investigate the effects of a massless scalar field coupled to an electromagnetic rotating black hole through Chern-Simons couplings; in particular, we consider both scalar-vector and scalar-tensor couplings. Us-ing both a slow rotation and small couplings approximation scheme, we are able to find an hairy black hole solution up to second order in the approxi-mation parameters. Such solution carries a secondary scalar charge, and it satisfies the Smarr formula for black hole thermodynamics. Furthermore, we propose a possible revealing effect for such hairy configuration, based on the polarization dependent angular deflection to which photons are subject to when interacting with the scalar field. At the end, we study the linear perturbation theory for a static, electromagnetic black hole, also including a Chern-Simons scalar-vector coupling to an external, massless axion field. We find that due to the presence of the magnetic charge the decoupling be-tween axial and polar perturbations is broken, leading to a Regge-Wheeler perturbation equation containing terms with different parity. E-Thesis Swansea 1 5 2020 2020-05-01 10.23889/SUthesis.56800 COLLEGE NANME COLLEGE CODE Swansea University Tasinato, Gianmassimo Doctoral Ph.D 2021-05-05T14:14:16.7683708 2021-05-05T13:19:34.3956020 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics FRANCESCO FILIPPINI 1 56800__19802__c4500d9cfaf34d2e9a70f0cefad35be1.pdf Filippini_Francesco_PhD_Thesis_Final_2020.1_Redacted_Signature.pdf 2021-05-05T13:56:46.9549977 Output 3480834 application/pdf E-Thesis – open access true Copyright: The author, Francesco Filippini, 2020. true eng
title Modern topics in black hole physics and cosmology
spellingShingle Modern topics in black hole physics and cosmology
FRANCESCO FILIPPINI
title_short Modern topics in black hole physics and cosmology
title_full Modern topics in black hole physics and cosmology
title_fullStr Modern topics in black hole physics and cosmology
title_full_unstemmed Modern topics in black hole physics and cosmology
title_sort Modern topics in black hole physics and cosmology
author_id_str_mv c68d82e7e98906dd2acb0a74842121be
author_id_fullname_str_mv c68d82e7e98906dd2acb0a74842121be_***_FRANCESCO FILIPPINI
author FRANCESCO FILIPPINI
author2 FRANCESCO FILIPPINI
format E-Thesis
publishDate 2020
institution Swansea University
doi_str_mv 10.23889/SUthesis.56800
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
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description Motivated by the new opportunities that gravitational wave detections of-fer in both cosmology and astrophysics, in this thesis we study potentially detectable physical phenomena related with black hole physics, with partic-ular interest to systems of black holes interacting with cosmological scalar fields.First of all, we study a charged, rotating black hole solution in a Gener-alised Proca theory of gravity, obtained through a disformal transformation of the Einstein-Maxwell action. Due to the breaking of gauge symmetry, the gauge freedom of the components of the gauge vector is lost; thus, for a particular choice of the gauge vector, we are able to find an exact, charged, rotating black hole solution, with event horizon and ergosphere parametri-cally different from the General Relativity solution. For such solution, the Innermost Stable Circular Orbits (ISCOs) are studied. Subsequently, we consider the effects of an external, ultralight scalar field interacting with an electromagnetic Kerr-Newman black hole. Depending on the frequen-cies of the scalar’s modes and on the angular velocity of the black hole, the scalar waves scattering off the event horizon may trigger superradiance; for some scalar field’s modes, a stationary scalar cloud is developed in the black hole’s surroundings, and the frequencies of the scalar’s modes in the cloud correspond to the resonant frequencies of the superradiant gain fac-tor. Moreover, we investigate the effects of a massless scalar field coupled to an electromagnetic rotating black hole through Chern-Simons couplings; in particular, we consider both scalar-vector and scalar-tensor couplings. Us-ing both a slow rotation and small couplings approximation scheme, we are able to find an hairy black hole solution up to second order in the approxi-mation parameters. Such solution carries a secondary scalar charge, and it satisfies the Smarr formula for black hole thermodynamics. Furthermore, we propose a possible revealing effect for such hairy configuration, based on the polarization dependent angular deflection to which photons are subject to when interacting with the scalar field. At the end, we study the linear perturbation theory for a static, electromagnetic black hole, also including a Chern-Simons scalar-vector coupling to an external, massless axion field. We find that due to the presence of the magnetic charge the decoupling be-tween axial and polar perturbations is broken, leading to a Regge-Wheeler perturbation equation containing terms with different parity.
published_date 2020-05-01T05:45:56Z
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