84 citations · 360 across the 19 of their papers we have counts for
20 papers
Dynamical Tidal Response of Non-rotating Black Holes: Connecting the MST Formalism and Worldline EFT
Hajime Kobayashi, Shinji Mukohyama, Naritaka Oshita +2
The response of a black hole (BH) to tidal forces encodes key information about the underlying gravitational theory and affects the waveform of gravitational waves emitted during b…
Large -point Functions in Resonant Inflation
Paolo Creminelli, Sébastien Renaux-Petel, Giovanni Tambalo +1
We investigate a qualitatively new regime of inflationary models with small and rapid oscillations in the potential-resonant non-Gaussianity. In contrast to the standard scenario,…
Effective Field Theory of Perturbations on Arbitrary Black Hole Backgrounds with Spacelike Scalar Profile
Shinji Mukohyama, Emeric Seraille, Kazufumi Takahashi +1
We develop the effective field theory (EFT) of perturbations in the context of scalar-tensor theories with a spacelike scalar profile on arbitrary black hole backgrounds. Our const…
Parametrized Tidal Dissipation Numbers of Non-rotating Black Holes
Hajime Kobayashi, Shinji Mukohyama, Naritaka Oshita +2
A set of tidal dissipation numbers (TDNs) quantifies the absorption of the tidal force exerted by a companion during an inspiralling phase of a binary compact object. This tidal di…
Singular instantons with finite action
Misao Sasaki, Vicharit Yingcharoenrat, Ying-li Zhang
Recently, it was shown that in the absence of gravity there exist non--symmetric instanton solutions with finite action beyond Coleman's instantons. In this paper, focusing o…
Inverting no-hair theorems: How requiring General Relativity solutions restricts scalar-tensor theories
Hajime Kobayashi, Shinji Mukohyama, Johannes Noller +3
Black hole solutions in general scalar-tensor theories are known to permit hair, i.e. non-trivial scalar profiles and/or metric solutions different from the ones of General Relativ…
Spherical black hole perturbations in EFT of scalar-tensor gravity with timelike scalar profile
Shinji Mukohyama, Kazufumi Takahashi, Keitaro Tomikawa +1
We study linear even-parity perturbations of static and spherically symmetric black holes with a timelike scalar profile by use of the effective field theory (EFT) approach. For il…
Beyond Coleman's Instantons
Misao Sasaki, Vicharit Yingcharoenrat, Ying-li Zhang
In the absence of gravity, Coleman's theorem states that the -symmetric instanton solution, which is regular at the origin and exponentially decays at infinity, gives the low…
Bridging Dark Energy and Black Holes with EFT: Frame Transformation and Gravitational Wave Speed
Shinji Mukohyama, Emeric Seraille, Kazufumi Takahashi +1
Typically, constraints on parameters of the effective field theory (EFT) of dark energy have been obtained in the Jordan frame, where matter fields are minimally coupled to gravity…
Tidal Love Numbers from EFT of Black Hole Perturbations with Timelike Scalar Profile
Chams Gharib Ali Barura, Hajime Kobayashi, Shinji Mukohyama +3
We study static tidal Love numbers (TLNs) of a static and spherically symmetric black hole for odd-parity metric perturbations. We describe black hole perturbations using the effec…
Non-perturbative Wavefunction of the Universe in Inflation with (Resonant) Features
Paolo Creminelli, Sébastien Renaux-Petel, Giovanni Tambalo +1
We study the statistics of scalar perturbations in models of inflation with small and rapid oscillations in the inflaton potential (resonant non-Gaussianity). We do so by deriving…
Effective Field Theory of Black Hole Perturbations in Vector-Tensor Gravity
Katsuki Aoki, Mohammad Ali Gorji, Shinji Mukohyama +2
We formulate the effective field theory (EFT) of vector-tensor gravity for perturbations around an arbitrary background with a vector profile, which can be applied…
Quasinormal Modes from EFT of Black Hole Perturbations with Timelike Scalar Profile
Shinji Mukohyama, Kazufumi Takahashi, Keitaro Tomikawa +1
The Effective Field Theory (EFT) of perturbations on an arbitrary background geometry with a timelike scalar profile was recently constructed in the context of scalar-tensor theori…
Super-horizon resonant magnetogenesis during inflation
Misao Sasaki, Valeri Vardanyan, Vicharit Yingcharoenrat
We propose a novel mechanism for significantly enhancing the amplitude of primordial electromagnetic fields during inflation. Similar to existing proposals, our idea is based on pa…
Generalized Regge-Wheeler Equation from Effective Field Theory of Black Hole Perturbations with a Timelike Scalar Profile
Shinji Mukohyama, Kazufumi Takahashi, Vicharit Yingcharoenrat
Recently, the Effective Field Theory (EFT) of perturbations on an arbitrary background metric with a timelike scalar profile was formulated in the context of scalar-tensor theories…
Effective Field Theory of Black Hole Perturbations with Timelike Scalar Profile: Formulation
Shinji Mukohyama, Vicharit Yingcharoenrat
We formulate the Effective Field Theory (EFT) of perturbations within scalar-tensor theories on an inhomogeneous background. The EFT is constructed while keeping a background of a…
Beyond Perturbation Theory in Inflation
Marco Celoria, Paolo Creminelli, Giovanni Tambalo +1
Inflationary perturbations are approximately Gaussian and deviations from Gaussianity are usually calculated using in-in perturbation theory. This method, however, fails for unlike…
Dark-Energy Instabilities induced by Gravitational Waves
Paolo Creminelli, Giovanni Tambalo, Filippo Vernizzi +1
We point out that dark-energy perturbations may become unstable in the presence of a gravitational wave of sufficiently large amplitude. We study this effect for the cubic Horndesk…
Resonant Decay of Gravitational Waves into Dark Energy
Paolo Creminelli, Giovanni Tambalo, Filippo Vernizzi +1
We study the decay of gravitational waves into dark energy fluctuations , taking into account the large occupation numbers. We describe dark energy using the effective field the…
Starobinsky Model in Rainbow Gravity
Auttakit Chatrabhuti, Vicharit Yingcharoenrat, Phongpichit Channuie
In this paper, we study the Starobinsky model of inflation in the context of gravity's rainbow theory. We propose that gravity rainbow functions can be written in the power-law for…