Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Siemonsen, Nils"'
Autor:
Siemonsen, Nils
Publikováno v:
Phys. Rev. Lett. 133, 031401 (2024)
We perform the first nonlinear and self-consistent study of the merger and ringdown of a black hole mimicking object with stable light rings. To that end, we numerically solve the full Einstein-Klein-Gordon equations governing the head-on collisions
Externí odkaz:
http://arxiv.org/abs/2404.14536
Autor:
East, William E., Siemonsen, Nils
Publikováno v:
Phys. Rev. D 108, 124048 (2023)
A massive spin-2 field can grow unstably around a black hole, giving rise to a potential probe of the existence of such fields. In this work, we use time-domain evolutions to study such instabilities. Considering the linear regime by solving the equa
Externí odkaz:
http://arxiv.org/abs/2309.05096
Autor:
Siemonsen, Nils, East, William E.
Publikováno v:
Phys. Rev. D 108, 124015 (2023)
Binary boson stars can be used to model the nonlinear dynamics and gravitational wave signals of merging ultracompact, but horizonless, objects. However, doing so requires initial data satisfying the Hamiltonian and momentum constraints of the Einste
Externí odkaz:
http://arxiv.org/abs/2306.17265
Ultralight bosons are predicted in many extensions to the Standard Model and are popular dark matter candidates. The black hole superradiance mechanism allows for these particles to be probed using only their gravitational interaction. In this scenar
Externí odkaz:
http://arxiv.org/abs/2305.00401
Autor:
Siemonsen, Nils, East, William E.
Publikováno v:
Phys. Rev. D 107, 124018 (2023)
Scalar boson stars have attracted attention as simple models for exploring the nonlinear dynamics of a large class of ultra compact and black hole mimicking objects. Here, we study the impact of interactions in the scalar matter making up these stars
Externí odkaz:
http://arxiv.org/abs/2302.06627
Autor:
Siemonsen, Nils, Mondino, Cristina, Egana-Ugrinovic, Daniel, Huang, Junwu, Baryakhtar, Masha, East, William E.
Publikováno v:
Phys. Rev. D 107, 075025 (2023)
We study the electrodynamics of a kinetically mixed dark photon cloud that forms through superradiance around a spinning black hole, and design strategies to search for the resulting multimessenger signals. A dark photon superradiance cloud sources a
Externí odkaz:
http://arxiv.org/abs/2212.09772
Publikováno v:
Phys. Rev. D 107, 104003 (2023)
Gravitational signatures of black hole superradiance are a unique probe of ultralight particles that are weakly-coupled to ordinary matter. The existence of an ultralight boson would lead spinning black holes with size comparable to the Compton wavel
Externí odkaz:
http://arxiv.org/abs/2211.03845
Autor:
Baryakhtar, Masha, Caputo, Regina, Croon, Djuna, Perez, Kerstin, Berti, Emanuele, Bramante, Joseph, Buschmann, Malte, Brito, Richard, Chen, Thomas Y., Cole, Philippa S., Coogan, Adam, East, William E., Foster, Joshua W., Galanis, Marios, Giannotti, Maurizio, Kavanagh, Bradley J., Laha, Ranjan, Leane, Rebecca K., Lehmann, Benjamin V., Marques-Tavares, Gustavo, McDonald, Jamie, Ng, Ken K. Y., Raj, Nirmal, Sagunski, Laura, Sakstein, Jeremy, Sathyaprakash, B. S., Shandera, Sarah, Siemonsen, Nils, Simon, Olivier, Sinha, Kuver, Singh, Divya, Singh, Rajeev, Sun, Chen, Sun, Ling, Takhistov, Volodymyr, Tsai, Yu-Dai, Vitagliano, Edoardo, Vitale, Salvatore, Yang, Huan, Zhang, Jun
Exploring dark matter via observations of extreme astrophysical environments -- defined here as heavy compact objects such as white dwarfs, neutron stars, and black holes, as well as supernovae and compact object merger events -- has been a major fie
Externí odkaz:
http://arxiv.org/abs/2203.07984
Publikováno v:
Journal of High Energy Physics 2022, Article number: 6 (2022)
We derive the classical gravitational radiation from an aligned spin binary black hole on \textit{closed} orbits, using a dictionary built from the 5-point QFT scattering amplitude of two massive particles exchanging and emitting a graviton. We show
Externí odkaz:
http://arxiv.org/abs/2110.12537
Autor:
Siemonsen, Nils, East, William E.
Publikováno v:
Phys. Rev. D 103, 044022 (2021)
We study the stability of rotating scalar boson stars, comparing those made from a simple massive complex scalar (referred to as mini boson stars), to those with several different types of nonlinear interactions. To that end, we numerically evolve th
Externí odkaz:
http://arxiv.org/abs/2011.08247