742 citations · 1.4k across the 26 of their papers we have counts for
26 papers
COSMOS: A numerical relativity code specialized for PBH formation
Chul-Moon Yoo, Hirotada Okawa, Albert Escrivà +7
Primordial black holes (PBHs) are black holes generated in the early universe without having gone through stellar evolution. In the standard formation process, PBHs are formed from…
Ultralight Boson Ionization from Comparable-Mass Binaries
Yuhao Guo, Zhen Zhong, Yifan Chen +3
Detection of gravitational waves enables probes of environmental effects around compact binaries. Ultralight bosons, well motivated in particle physics and capable of forming core-…
Impact of a plasma on the relaxation of black holes
Enrico Cannizzaro, Thomas F. M. Spieksma, Vitor Cardoso +1
Our universe is permeated with interstellar plasma, which prevents propagation of low-frequency electromagnetic waves. Here, we show that two dramatic consequences arise out of suc…
Piercing of a solitonic boson star by a black hole
Zhen Zhong, Vitor Cardoso, Taishi Ikeda +1
Recently, the piercing of a mini boson star by a black hole was studied, with tidal capture and the discovery of a "gravitational atom" being reported ( arXiv:2206.00021 [gr-qc] ).…
Superradiance: Axionic Couplings and Plasma Effects
Thomas F. M. Spieksma, Enrico Cannizzaro, Taishi Ikeda +2
Spinning black holes can transfer a significant fraction of their energy to ultralight bosonic fields via superradiance, condensing them in a co-rotating structure or "cloud". This…
Parasitic black holes: the swallowing of a fuzzy dark matter soliton
Vitor Cardoso, Taishi Ikeda, Rodrigo Vicente +1
Fuzzy dark matter is an exciting alternative to the standard cold dark matter paradigm, reproducing its large scale predictions, while solving most of the existing tension with sma…
Piercing of a boson star by a black hole
Vitor Cardoso, Taishi Ikeda, Zhen Zhong +1
New light fundamental fields are natural candidates for all or a fraction of dark matter. Self-gravitating structures of such fields might be common objects in the universe, and co…
Nonperturbative gedanken experiments in Einstein-dilaton-Gauss-Bonnet gravity: nonlinear transitions and tests of the cosmic censorship beyond General Relativity
Fabrizio Corelli, Marina De Amicis, Taishi Ikeda +1
As the only gravity theory with quadratic curvature terms and second-order field equations, Einstein-dilaton-Gauss-Bonnet gravity is a natural testbed to probe the high-curvature r…
What is the fate of Hawking evaporation in gravity theories with higher curvature terms?
Fabrizio Corelli, Marina De Amicis, Taishi Ikeda +1
During the final stages of black hole evaporation, ultraviolet deviations from General Relativity eventually become dramatic, potentially affecting the end-state. We explore this p…
Instabilities of scalar fields around oscillating stars
Taishi Ikeda, Vitor Cardoso, Miguel Zilhão
The behavior of fundamental fields in strong gravity or nontrivial environments is important for our understanding of nature. This problem has interesting applications in the conte…
Challenging the cosmic censorship in Einstein-Maxwell-scalar theory with numerically simulated gedankenexperiments
Fabrizio Corelli, Taishi Ikeda, Paolo Pani
We perform extensive nonlinear numerical simulations of the spherical collapse of (charged) wavepackets onto a charged black hole within Einstein-Maxwell theory and in Einstein-Max…
Spontaneous scalarization of charged black holes in the Scalar-Vector-Tensor theory
Taishi Ikeda, Tomohiro Nakamura, Masato Minamitsuji
We present spontaneous scalarization of charged black holes (BHs) which is induced by the coupling of the scalar field to the electromagnetic field strength and the double-dual Rie…
Spontaneous scalarization of black holes in the Horndeski theory
Masato Minamitsuji, Taishi Ikeda
We investigate the possibility of spontaneous scalarization of static, spherically symmetric, and asymptotically flat black holes (BHs) in the Horndeski theory. Spontaneous scalari…
The physics of black hole binaries: geodesics, relaxation modes and energy extraction
Laura Bernard, Vitor Cardoso, Taishi Ikeda +1
Black holes are the simplest macroscopic objects, and provide unique tests of General Relativity. They have been compared to the Hydrogen atom in quantum mechanics. Here, we establ…
Gravitational Waves in Gravity: Scalar Waves and the Chameleon Mechanism
Taishi Katsuragawa, Tomohiro Nakamura, Taishi Ikeda +1
We discuss the scalar mode of gravitational waves emerging in the context of gravity by taking into account the chameleon mechanism. Assuming a toy model with a specific mat…
Scalarized black holes in the presence of the coupling to Gauss-Bonnet gravity
Masato Minamitsuji, Taishi Ikeda
In this paper, we study static and spherically symmetric black hole (BH) solutions in the scalar-tensor theories with the coupling of the scalar field to the Gauss-Bonnet (GB) term…
Electromagnetic emission from axionic clouds and the quenching of superradiant instabilities
Taishi Ikeda, Richard Brito, Vitor Cardoso
The nature of dark matter is one of the longest-standing puzzles in science. Axions or axion-like particles are a key possibility, and arise in mechanisms to solve the strong CP pr…
Axionic instabilities and new black hole solutions
Mateja Boskovic, Richard Brito, Vitor Cardoso +2
The coupling between scalar and vector fields has a long and interesting history. Axions are one key possibility to solve the strong CP problem and axion-like particles could be on…
Gravitational Collapse of a Massless Scalar Field in a Periodic Box
Chul-Moon Yoo, Taishi Ikeda, Hirotada Okawa
Gravitational collapse of a massless scalar field with the periodic boundary condition in a cubic box is reported. This system can be regarded as a lattice universe model. We const…
Black holes, gravitational waves and fundamental physics: a roadmap
Leor Barack, Vitor Cardoso, Samaya Nissanke +203
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem-…
Remarks on the maximum luminosity
Vitor Cardoso, Taishi Ikeda, Christopher J. Moore +1
The quest for fundamental limitations on physical processes is old and venerable. Here, we investigate the maximum possible power, or luminosity, that any event can produce. We sho…
Chameleon Field in a Spherical Shell System
Tomohiro Nakamura, Taishi Ikeda, Ryo Saito +1
We investigate the validity of screening mechanism of the fifth force for chameleon field in highly inhomogeneous density profile. For simplicity, we consider a static and spherica…
Parameter estimation by decoherence in the double-slit experiment
Akira Matsumura, Taishi Ikeda, Shingo Kukita
We discuss a parameter estimation problem using quantum decoherece in the double-slit interferometer. We consider a particle coupled to a massive scalar field after the particle pa…
Self-gravitating oscillons and new critical behavior
Taishi Ikeda, Chul-Moon Yoo, Vitor Cardoso
The dynamical evolution of self-interacting scalars is of paramount importance in cosmological settings, and can teach us about the content of Einstein's equations. In flat space,…