A5049218749- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
- Black Holes and Theoretical Physics
- Galaxies: Formation, Evolution, Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Particle physics theoretical and experimental studies
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Scientific Research and Discoveries
- Quantum Information and Cryptography
- Astrophysics and Cosmic Phenomena
- Blind Source Separation Techniques
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Spectroscopy and Chemometric Analyses
- GNSS positioning and interference
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Optical Sensing Technologies
- Optical Polarization and Ellipsometry
- Geomagnetism and Paleomagnetism Studies
Kavli Institute for the Physics and Mathematics of the Universe
2023-2024
The University of Tokyo
2018-2024
Max Planck Institute for Astrophysics
2020-2024
High Energy Accelerator Research Organization
2024
Campbell Collaboration
2023
Kyoto University
2014-2021
Max Planck Society
2021
Kobe University
2014-2016
We demonstrate that the recently announced signal for a stochastic gravitational wave background (SGWB) from pulsar timing array (PTA) observations, if attributed to new physics, is compatible with primordial GW production due axion-gauge dynamics during inflation. More specifically we find axion-U(1) models may lead sufficient particle explain while simultaneously source some fraction of sub-solar mass black holes (PBHs) as signature. Moreover there parity violation in sector, hence model...
We propose a novel experiment to search for axion dark matter that differentiates the phase velocities of left- and right-handed polarized photons. Our optical cavity measures difference resonant frequencies between two circular polarizations laser beam. The design our adopts double-pass configuration realize null give high common mode rejection environmental disturbances. estimate potential sensitivity axion-photon coupling constant ${g}_{a\ensuremath{\gamma}}$ mass...
A bstract The recent analysis of the Planck 2018 polarization data shows a nonzero isotropic cosmic birefringence (ICB) that is not explained within ΛCDM paradigm. We then explore question whether ICB interpreted by framework Standard Model Effective Field Theory (SMEFT), or at energy scales microwave background, low-energy EFT (LEFT) whose dynamical degrees freedom are five SM quarks and all neutral charged leptons. Our systematic study reveals any operator in on cosmological background...
Abstract The evidence for a non-vanishing isotropic cosmic birefringence in recent analyses of the CMB data provides tantalizing hint new physics. Domain wall (DW) networks have recently been shown to generate an signal ballpark measured value when coupled photons. In this work, we explore axionic defects hypothesis more detail and extending previous results annihilating late-forming networks, by pointing out other smoking-gun signatures network spectrum such as anisotropic birefringent...
Abstract We study the possibility of using LiteBIRD satellite B -mode survey to constrain models inflation producing specific features in CMB angular power spectra. explore a particular model example, i.e. spectator axion-SU(2) gauge field inflation. This can source parity-violating gravitational waves from amplification fluctuations driven by pseudoscalar “axionlike” field, rolling for few e-folds during The sourced exceed vacuum contribution at reionization bump scales about an order...
Abstract We estimate the efficiency of mitigating lensing B -mode polarization, so-called delensing, for LiteBIRD experiment with multiple external data sets lensing-mass tracers. The current best bound on tensor-to-scalar ratio, r , is limited by rather than Galactic foregrounds. Delensing will be a critical step to improve sensitivity as measurements become more and lensing. In this paper, we extend analysis recent forecast paper include mass tracers, i.e., CMB maps from CMB-S4-like...
We study inflation driven by a dilaton and an axion, both of which are coupled to SU(2) gauge field. find that the occurs in early stage during field grows due kinetic function. When energy density magnetic fields catches up with electric fields, chromo-natural takes over late inflation, we call delayed inflation. Thus, axion is induced dilaton. The interesting outcome model generation chiral primordial gravitational waves on small scales. Since inert it viable contrast conventinal parameter...
Axion dark matter differentiates the phase velocities of circular-polarized photons. In this Letter, a scheme to measure difference by using linear optical cavity is proposed. If applied Fabry-Pérot arm Advanced-LIGO-like (Cosmic-Explorer-Like) gravitational wave detector, potential sensitivity axion-photon coupling constant, g_{aγ}, reaches g_{aγ}≃8×10^{-13} GeV^{-1}(4×10^{-14} GeV^{-1}) at axion mass m≃3×10^{-13} eV (2×10^{-15} eV) and remains around for three orders magnitude in mass....
Abstract The recently reported non-zero isotropic birefringence angle in Planck 2018 polarization data provides a tantalizing hint for new physics of axions. In this paper, we explain by string theory motivated axion with monodromy potential that plays the role dark energy. Upon using measurement and constraint on equation state energy scenario, find an upper bound decay constant as f ≲ 10 16 GeV. This naturally gives scale order GUT can resolve theoretical issue super-Planckian field range...
Abstract We show that a recent constraint on the cosmic birefringence effect due to dark energy can be related constraints coupling of axion matter photon, by relying simple model two-axion alignment mechanism with periodic potentials. Owing potentials, one linear combination two fields provides nearly flat direction and acts as energy, whereas other steep matter. This scenario solves known conceptual issues one-field for predicts connection between seemingly disparate sectors our universe.
Abstract We study a mechanism of generating the trispectrum (4-point correlation) curvature perturbation through dynamics spectator axion field and U(1) gauge during inflation. Owing to Chern-Simons coupling, only one helicity mode experiences tachyonic instability sources scalar perturbations. Sourced exhibits parity-violating nature which can be tested its trispectrum. numerically compute parity-even parity-odd component sourced It is found that ratio reach 𝒪(10%) in an exact equilateral...
Abstract We present a study of the impact beam far side-lobe lack knowledge on measurement Cosmic Microwave Background B -mode signal at large scale. Beam side-lobes induce mismatch in transfer function Galactic foregrounds between dipole and higher multipoles which degrads performances component separation methods. This leads to foreground residuals CMB map. It is expected be one main source systematic effects future polarization observations. Thus, it becomes crucial for all-sky survey...
Abstract Phenomenological success of inflation models with axion and SU(2) gauge fields relies crucially on control backreaction from particle production. Most the previous study only demanded terms in equations motion for be small basis order-of-magnitude estimation. In this paper, we solve a wide range parameters spectator axion-SU(2) model. First, find new slow-roll solution system absence backreaction. Next, obtain accurate conditions stable solutions presence Finally, show that...
Axions are one of the well-motivated candidates for dark matter, originally proposed to solve strong $CP$ problem in particle physics. Dark matter Axion search with riNg Cavity Experiment (DANCE) is a new experimental project broadly axion mass range ${10}^{\ensuremath{-}17}\text{ }\text{ }\mathrm{eV}<\phantom{\rule{0ex}{0ex}}{m}_{a}<{10}^{\ensuremath{-}11}\text{ }\mathrm{eV}$. We aim detect rotational oscillation linearly polarized light caused by axion-photon coupling bow-tie cavity. The...
Abstract We explore the capability of measuring lensing signals in LiteBIRD full-sky polarization maps. With a 30 arcmin beam width and an impressively low noise 2.16 μ K-arcmin, will be able to measure cosmic microwave background (CMB) very precisely. This unique sensitivity also enables reconstruction nearly map using only data, even considering its limited capture small-scale CMB anisotropies. In this paper, we investigate ability construct measurement presence Galactic foregrounds,...
Abstract The detection of primordial B modes the cosmic microwave background (CMB) could provide information about early stages Universe's evolution. faintness this signal requires exquisite calibration accuracy and control instrumental systematic effects which otherwise bias measurements. In work, we study impact an imperfect relative polarisation gain on recovered value tensor-to-scalar ratio r for LiteBIRD experiment, through application blind Needlet Internal Linear Combination (NILC)...
We have proposed using laser interferometric gravitational wave detectors to search for ultralight vector and axion dark matter. Vector matter can be probed through oscillating forces on suspended mirrors, while detected via polarization rotation of beams. This paper reviews these searches with the KAGRA detector in Japan, including first KAGRA's 2020 data installation optics during upcoming 2025 observing run.
We study axionic inflation with a modulated potential and examine if the primordial tensor power spectrum exhibits oscillatory feature, which is testable future space-based gravitational-wave experiments such as DECIGO BBO. In case of single-field axion monodromy inflation, it turns out that difficult to detect an oscillation in due suppression sub-Planckian decay constant axion. On other hand, aligned chromo-natural where coupled SU(2) gauge field, sizable can occur enhancement chiral...
We study chromo-natural inflation in the axiverse. More precisely, we investigate natural with two axions coupled a SU(2) gauge field. Assuming hierarchy between coupling constants, find that for certain initial conditions, conventional commences and continues tens of $e$-foldings, subsequently takes over from inflation. For these solutions, expect predictions are agreement observations on CMB scales. Moreover, since occurs latter part inflationary stage, chiral primordial gravitational...
Anisotropic inflation is an interesting model with \U(1) gauge field and it predicts the statistical anisotropy of curvature perturbation characterized by a parameter g*. However, we find that background does not follow classical attractor solution due to stochastic effect. We develop formalism vector solve Langevin Fokker-Planck equations. It shown this excluded CMB constraint g*≤ 10−2 high probability about 99.999%.
Recently, a considerable amount of attention has been given to the search for ultralight dark matter by measuring oscillating length changes in arm cavities gravitational wave detectors. Although detectors are extremely sensitive differential changes, sensitivity is largely attenuated, as effect mostly common cavity test masses. Here, we propose use auxiliary channels, which measure power and signal recycling lengths Michelson interferometer length. The can be enhanced exploiting fact that...
Recently, several studies have pointed out that gravitational-wave detectors are sensitive to ultralight vector dark matter and can improve the current best constraints given by equivalence principle tests. While a detector is highly precise measuring tool for length difference of its arms, sensitivity limited because displacements test mass mirrors caused almost common. In this paper, we point significantly improved if effect finite light-traveling time in detector's arms taken into...
Abstract We present new constraints on spectator axion-U(1) gauge field interactions during inflation using the latest Planck (PR4) and BICEP/Keck 2018 data releases. This model can source tensor perturbations from amplified fluctuations, driven by an axion rolling for a few e-folds inflation. The gravitational waves sourced in this way have strongly scale-dependent (and chiral) spectrum, with potentially visible contributions to large/intermediate scale B -modes of CMB. first derive...
Ultralight bosonic particles are fascinating candidates of dark matter (DM). It behaves as classical waves in our Galaxy due to its large number density. There have been various methods proposed search for the wavelike DM, such utilizing interferometric gravitational-wave detectors. Understanding characteristics DM signals is crucial extract properties from data. While signal nearly monochromatic with angular frequency mass, amplitude and phase gradually changing velocity dispersion DMs...
Received 2 May 2017DOI:https://doi.org/10.1103/PhysRevD.95.109903© 2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCosmologyGravitational wavesSupergravityGravitation, Cosmology & Astrophysics