240 citations · 1.3k across the 27 of their papers we have counts for
19 papers · 1 filter
Relativistic bubble collisions -- a closer look
Ryusuke Jinno, Thomas Konstandin, Masahiro Takimoto
We study scalar bubble collisions in first-order phase transitions focusing on the relativistic limit. We propose 'trapping equation' which describes the wall behavior after collis…
Fingerprinting models of first-order phase transitions by the synergy between collider and gravitational-wave experiments
Katsuya Hashino, Ryusuke Jinno, Mitsuru Kakizaki +3
We investigate the sensitivity of future space-based interferometers such as LISA and DECIGO to the parameters of new particle physics models which drive a first-order phase transi…
Classical Nonrelativistic Effective Field Theory and the Role of Gravitational Interactions
Joshua Eby, Kyohei Mukaida, Masahiro Takimoto +2
Coherent oscillation of axions or axion-like particles may give rise to long-lived clumps, called axion stars, because of the attractive gravitational force or its self-interaction…
Gravitational waves from first-order phase transitions: Towards model separation by bubble nucleation rate
Ryusuke Jinno, Sangjun Lee, Hyeonseok Seong +1
We study gravitational-wave production from bubble collisions in a cosmic first-order phase transition, focusing on the possibility of model separation by the bubble nucleation rat…
Gravitational waves from bubble dynamics: Beyond the Envelope
Ryusuke Jinno, Masahiro Takimoto
We study gravitational-wave production from bubble dynamics (bubble collisions and sound waves) during a cosmic first-order phase transition with an analytic approach. We first pro…
Absolute Lower Bound on the Bounce Action
Ryosuke Sato, Masahiro Takimoto
The decay rate of a false vacuum is determined by the minimal action solution of the tunnelling field: bounce. In this Letter, we focus on models with scalar fields which have a ca…
On Longevity of I-ball/Oscillon
Kyohei Mukaida, Masahiro Takimoto, Masaki Yamada
We study I-balls/oscillons, which are long-lived, quasi-periodic, and spatially localized solutions in real scalar field theories. Contrary to the case of Q-balls, there is no evid…
Probing classically conformal model with gravitational waves
Ryusuke Jinno, Masahiro Takimoto
We study the cosmological history of the classical conformal gauge extension of the standard model, in which the physical scales are generated via the Coleman-Weinberg-type s…
Gravitational waves from the first order phase transition of the Higgs field at high energy scales
Ryusuke Jinno, Kazunori Nakayama, Masahiro Takimoto
In a wide class of new physics models, there exist scalar fields that obtain vacuum expectation values of high energy scales. We study the possibility that the standard model Higgs…
Higgs inflation and suppression of axion isocurvature perturbation
Kazunori Nakayama, Masahiro Takimoto
We point out that cosmological constraint from the axion isocurvature perturbation is relaxed if the Higgs field obtains a large field value during inflation in the DFSZ axion mode…
Towards a Scale Free Electroweak Baryogenesis
Kazuya Ishikawa, Teppei Kitahara, Masahiro Takimoto
We propose a new electroweak baryogenesis scenario in high-scale supersymmetric (SUSY) models. We consider a singlet extension of the minimal SUSY standard model introducing additi…
Axion Models with High Scale Inflation
Takeo Moroi, Kyohei Mukaida, Kazunori Nakayama +1
We revisit the cosmological aspects of axion models. In the high-scale inflation scenario, the Peccei-Quinn (PQ) symmetry is likely to be restored during/after inflation. If the cu…
Singlino Resonant Dark Matter and 125 GeV Higgs Boson in High-Scale Supersymmetry
Kazuya Ishikawa, Teppei Kitahara, Masahiro Takimoto
We consider a singlino Dark Matter (DM) scenario in a singlet extension model of the Minimal Supersymmetric Standard Model, which is so-called the Nearly MSSM (nMSSM). We find that…
Correspondence of I- and Q-balls as Non-relativistic Condensates
Kyohei Mukaida, Masahiro Takimoto
If a real scalar field is dominated by non-relativistic modes, then it approximately conserves its particle number and obeys an equation that governs a complex scalar field theory…
Curvaton Dynamics Revisited
Kyohei Mukaida, Kazunori Nakayama, Masahiro Takimoto
We revisit the dynamics of the curvaton in detail taking account of effects from thermal environment, effective potential and decay/dissipation rate for general field values and co…
Fate of Symmetric Scalar Field
Kyohei Mukaida, Kazunori Nakayama, Masahiro Takimoto
The evolution of a coherently oscillating scalar field with symmetry is studied in detail. We calculate the dissipation rate of the scalar field based on the closed time path…
Scalar Trapping and Saxion Cosmology
Takeo Moroi, Kyohei Mukaida, Kazunori Nakayama +1
We study in detail the dynamics of a scalar field in thermal bath with symmetry breaking potential. In particular, we focus on the process of trapping of a scalar field at an enhan…
Non-Thermal Production of Wino Dark Matter via the Decay of Long-Lived Particles
Takeo Moroi, Minoru Nagai, Masahiro Takimoto
We consider supersymmetric models in which the neutral Wino is the lightest superparticle (LSP), and study the possibility that non-thermally produced Wino plays the role of dark m…
Thermal Effects on Saxion in Supersymmetric Model with Peccei-Quinn Symmetry
Takeo Moroi, Masahiro Takimoto
We consider supersymmetric model with Peccei-Quinn symmetry and study effects of saxion on the evolution of the universe, paying particular attention to the effects of thermal bath…