Banca de DEFESA: VITOR FERNANDES GUIMARÃES
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : VITOR FERNANDES GUIMARÃES
DATE: 10/03/2025
TIME: 14:00
LOCAL: https://conferenciaweb.rnp.br/ufabc/defesa-mestrado-vitor
TITLE:
Perturbations from gravitationally decoupled hairy black holes
PAGES: 100
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUBÁREA: Física Geral
SPECIALTY: Relatividade e Gravitação
SUMMARY:
The detection of gravitational waves (GWs) by LIGO in 2015 [1, 2] gifted us with a new
tool to investigate the universe that can help us probe spacetime for strange entities such
as hairy black holes (HBHs). These entities are a priori precluded from existence due to
what is called the “no-hair conjecture” [10]. In this work, we implement the method of
gravitational decoupling (GD)[4, 7] capable of separating gravitational sources, which was
previously deemed impossible due to the high non-linear character of the Einstein field
equations [7]. Said process generates new terms in the metric that can be interpreted as
primary hair [5]. Having used this method to generate hair from the seed Schwarzschild
black hole solution [5], we apply perturbation theory in order to investigate the form and
properties of the gravitational waves produced by this object [3] thorugh the analysis of its
quasi-normal modes (QNMs). Using SageMath, we have constructed a code that produces
the Regge-Wheeler and Zerilli equations[9, 11] from any given spherically symmetric met-
ric, which govern the metric perturbation and which applies the 3rd-order WKB method
to obtain its QNMs. The main goal of this work is to search for hair signatures in these
modes that would distinguish them from the seed solution, and construct a database for
use in future GW observations.
[1] B. P. Abbott, R. Abbott, T. Abbott, M. Abernathy, F. Acernese, K. Ackley,
C. Adams, T. Adams, P. Addesso, R. Adhikari, et al. Observation of gravitational
waves from a binary black hole merger. Physical review letters, 116(6):061102, 2016.[2] B. P. Abbott, R. Abbott, T. Abbott, F. Acernese, K. Ackley, C. Adams, T. Adams,
P. Addesso, R. X. Adhikari, V. B. Adya, et al. Gw170814: a three-detector obser-
vation of gravitational waves from a binary black hole coalescence. Physical review
letters, 119(14):141101, 2017.
[3] R. Cavalcanti, R. de Paiva, and R. da Rocha. Echoes of the gravitational decoupling:
scalar perturbations and quasinormal modes of hairy black holes. The European
Physical Journal Plus, 137(10):1185, 2022.
[4] J. Ovalle. Decoupling gravitational sources in general relativity: from perfect to
anisotropic fluids. Physical Review D, 95(10):104019, 2017.
[5] J. Ovalle, R. Casadio, E. Contreras, and A. Sotomayor. Hairy black holes by gravi-
tational decoupling. Physics of the Dark Universe, 31:100744, 2021.
[6] J. Ovalle, R. Casadio, R. da Rocha, and A. Sotomayor. Anisotropic solutions by
gravitational decoupling. The European Physical Journal C, 78:1–11, 2018.
[7] J. Ovalle, R. Casadio, R. d. Rocha, A. Sotomayor, and Z. Stuchl´ık. Black holes by
gravitational decoupling. The European Physical Journal C, 78:1–11, 2018.
[8] J. Ovalle, R. Casadio, and A. Sotomayor. The minimal geometric deformation ap-
proach: A brief introduction. Advances in High Energy Physics, 2017, 2017.
[9] T. Regge and J. A. Wheeler. Stability of a schwarzschild singularity. Physical Review,
108(4):1063, 1957.
[10] R. Ruffini and J. A. Wheeler. Introducing the black hole. Physics today, 24(1):30–41,
1971.
[11] F. J. Zerilli. Gravitational field of a particle falling in a schwarzschild geometry
analyzed in tensor harmonics. Physical Review D, 2(10):2141, 1970.
COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 1574260 - ROLDAO DA ROCHA JUNIOR
Membro Titular - Examinador(a) Externo ao Programa - 1067352 - ALAN MACIEL DA SILVA
Membro Titular - Examinador(a) Externo à Instituição - ROGÉRIO TEIXEIRA CAVALCANTI - UERJ
Membro Suplente - Examinador(a) Interno ao Programa - 2616823 - ALYSSON FABIO FERRARI
Membro Suplente - Examinador(a) Interno ao Programa - 1907614 - MAURICIO RICHARTZ
Membro Suplente - Examinador(a) Externo à Instituição - GAYANE KARAPETYAN - UFABC