A5007131223- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Computational Physics and Python Applications
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Black Holes and Theoretical Physics
- Neutrino Physics Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Quantum Information and Cryptography
- Atomic and Subatomic Physics Research
- Astronomy and Astrophysical Research
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Fusion materials and technologies
- Graphite, nuclear technology, radiation studies
- Particle Detector Development and Performance
- Cold Atom Physics and Bose-Einstein Condensates
- Topological Materials and Phenomena
- Quantum Computing Algorithms and Architecture
- Semiconductor Quantum Structures and Devices
- Particle accelerators and beam dynamics
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
Chinese Academy of Sciences
2012-2025
Institute of High Energy Physics
2018-2025
Tohoku University
2016-2025
China Spallation Neutron Source
2022-2025
Tokyo Metropolitan University
2024-2025
The University of Tokyo
2019-2024
Kootenay Association for Science & Technology
2024
Korea Advanced Institute of Science and Technology
2019-2024
Harbin Engineering University
2024
University of Chinese Academy of Sciences
2022
The long-standing discrepancy of the muon anomalous magnetic moment ($g\ensuremath{-}2$) is a hint new physics beyond standard model particle physics. In this paper, we show that heavy contribution can be fully tested at collider with center-of-mass energy up to $\mathcal{O}(10)\text{ }\text{ }\mathrm{TeV}$ }{\mathrm{ab}}^{\ensuremath{-}1}$. Even if there no in range, one measure $g\ensuremath{-}2$ operator directly via channel Higgs boson and monochromatic photon. particular, latter...
We study for the first time gravitational waves generated during collapse of domain walls, incorporating potential bias in lattice simulations. The final stages wall are crucial production waves, but have remained unexplored due to computational difficulties. As a significant application this new result, we show that observed NANOGrav, EPTA, PPTA, and CPTA data, which indicate stochastic nanohertz regime, can be attributed axion walls coupled QCD. In our model, non-perturbative effects QCD...
We study an axion-like particle (ALP) that experiences the first-order phase transition with respect to its mass or potential minimum. This can be realized if ALP obtains a from non-perturbative effects of SU($N$) gauge theory is confined via transition, trapped in false vacuum at high temperatures until it starts oscillate about true The resulting abundance significantly enhanced compared standard misalignment mechanism, explaining dark matter broader parameter space accessible experiments...
A bstract Several attempts to solve the cosmological constant problem, which concerns value of being extremely smaller than Standard Model mass scales, have introduced a scalar field with very flat potential that can be approximated as linear around any given position. The scans in such way current small is explained. Recently, Dark Energy Spectroscopic Instrument (DESI) reported results first year. Combining data CMB, Pantheon, Union3, and/or DES-SN5YR, there preference or anomaly,...
The identity of dark matter has been a mystery in astronomy, cosmology, and particle theory for about century. We present the first search with high-dispersion spectrograph by using WINERED at 6.5 m Magellan Clay telescope to measure photons from decays. dwarf spheroidal galaxies (dSphs) Leo V Tucana II are observed utilizing an object-sky-object nodding observation technique. Employing zero consistent flux data after sky subtraction performing Doppler shift analysis further background...
Axionlike particles (ALPs), hypothetical particles, are known to be produced through axion-photon conversion in the presence of a stationary external magnetic field that is strong enough. Devices such as undulators and wigglers, which used widely for photon production, e.g., synchrotron radiation facilities, inherently possess fields, making them potential sources ALP production without introducing additional light source or fields. In this paper, we establish formalisms formulas studying...
Abstract We investigate a novel scenario involving asymmetric keV-range dark matter (DM) in the form of right-handed (sterile) neutrinos. Based on Fermi-Dirac distribution, we demonstrate that fermionic DM forms Fermi degenerate gas, making it potentially colder than symmetric DM. This setup simultaneously accounts for Universe's baryon asymmetry through tiny Yukawa interactions with Standard Model leptons and Higgs field, homochirality amino acids via decay into circularly polarized...
We show that the upper bound of classical QCD axion window can be significantly relaxed for low-scale inflation. If Gibbons-Hawking temperature during inflation is lower than scale, initial misalignment angle follows Bunch-Davies distribution. The distribution peaked at strong CP conserving minimum if there no other light degree freedom contributing to phase. As a result, overproduction problem even an decay constant larger $10^{12}$GeV. also provide concrete hilltop models where Hubble...
We review the physics potential of a next generation search for solar axions: International Axion Observatory (IAXO) . Endowed with sensitivity to discover axion-like particles (ALPs) coupling photons as small gaγ∼ 10−12 GeV−1, or electrons gae∼10−13, IAXO has find QCD axion in 1 meV∼1 eV mass range where it solves strong CP problem, can account cold dark matter Universe and be responsible anomalous cooling observed number stellar systems. At same time, will have enough detect lower axions...
We propose a SUSY scenario to explain the current electron and muon $g-2$ discrepancies without introducing lepton flavor mixings. Threshold corrections Yukawa couplings can enhance flip sign of contributions. The mechanism predicts flavor-dependent slepton mass spectrum. show that it is compatible with Higgs mediation scenario.
A bstract In this paper we present a novel mechanism for producing the observed Dark Matter (DM) relic abundance during First Order Phase Transition (FOPT) in early universe. We show that bubble expansion with ultra-relativistic velocities can lead to of DM particles masses much larger than scale transition. study non-thermal production context generic phase transition and electroweak The application Higgs portal as well signal Stochastic Gravitational Background are discussed.
We revisit the ALP miracle scenario where inflaton and dark matter are unified by a single axion-like particle (ALP). first extend our previous analysis on dynamics to identify whole viable parameter space consistent with CMB observation. Then, we evaluate relic density of incorporating uncertainties model-dependent couplings weak gauge bosons as well dissipation effect. The preferred ranges mass coupling photons found be 0.01 ≲ m ϕ 1 eV $$ {g}_{\phi \gamma...
Recently, an anomalous excess was found in the electronic recoil data collected at XENON1T experiment. The may be explained by axionlike particle (ALP) with a mass of few keV and coupling to electron g_{ae}∼10^{-13}, if ALP constitutes all or some fraction local dark matter (DM). In order satisfy x-ray constraint, photons must significantly suppressed compared that electrons. This strongly suggests has no couplings photons; i.e., there is U(1)_{PQ}-U(1)_{em}-U(1)_{em} anomaly. We show such...
We present a novel mechanism which leads to the baryon asymmetry generation during strong first order phase transition. If bubble wall propagates with ultra-relativistic velocities, it has been shown that can produce states much heavier than scale of transition and those are then out-of-equilibrium. In this paper, we show production also induce CP-violation at one-loop level. calculate CP violating effects heavy particle show, combined number interactions, lead successful baryogenesis. Two...
We propose a simple mechanism of light dark matter (DM) production from the decay oscillating inflaton condensation. If reheating temperature after inflation is higher than mass, which same order momentum DM at time production, can be suppressed compared to thermal plasma if interaction weak enough. Consequently, cold enough avoid observational constraints on warm DM, like Lyman-$\alpha$ bound even mass small. study bosonic and fermionic decay, taking into account effect stimulated emission...
Recently, the CDF collaboration has reported precise measurement of W boson mass, MW=80433.5±9.4MeV, based on 8.8 fb−1 s=1.96 TeV pp¯ collision data from II detector at Fermilab Tevatron. This is about 7σ away Standard Model prediction, MWSM=80357±6MeV. Such a large discrepancy may be partially due to exotic particles that radiatively alter relation between and Z masses. In this Letter, we study singlet extensions focusing shift mass since they are accidentally flavor CP safe without...
We analyze the phase transitions in minimal extension of SM with a real singlet scalar field. The novelty our study is that we identify and details region parameter space where first order transition can occur particular when bubbles true vacuum reach relativistic velocities. This interesting since it lead to new recently discussed baryogenesis Dark Matter production mechanisms. fully different models for as well possibilities discovery at current future experiments.
We study the formation and evolution of domain walls with initial inflationary fluctuations by numerical lattice calculations that, for first time, correctly take into account correlations on superhorizon scales. find contrary to widely-held claim {over past few tens years}, wall network exhibits remarkable stability even when distribution is largely biased toward one minima. This due fact that retains information about conditions scales, scaling solution not a local attractor in this sense....
A bstract new era of exploring the early Universe may have begun with recent strong evidence for stochastic gravitational wave (GW) background from data reported by NANOGrav, EPTA (including InPTA data), PPTA, and CPTA. Inspired this, we propose a potential source GWs in minimal supersymmetric standard model (MSSM), which could be theory at very high energy scale. This is “axion” field Higgs multiplets when takes large value along D-flat direction Universe, example, during inflation. The...
We propose a scenario where both inflation and dark matter are described by single axion-like particle (ALP) in unified manner. In class of the minimal axion hilltop inflation, effective masses at maximum mimimum potential have equal magnitude but opposite sign, so that ALP inflaton is light during true vacuum. After most ALPs decay evaporate into plasma through coupling to photons, remaining ones become matter. find observed CMB power spectrum as well abundance point an mass mϕ = (0.01) eV...
A bstract We study a hilltop inflation model where an axion-like particle (ALP) plays the role of inflaton. find that, for broad class potentials, decay constant and mass at potential minimum satisfy relation, m ϕ ∼ 10 − 6 f , to explain CMB normalization. The ALP is necessarily coupled standard particles successful reheating. with above relation can be searched beam dump experiments, e.g., SHiP experiment, if scale sufficiently low. In this case, decays through interactions that led...
We show that the initial misalignment angle of QCD axion (or axion-like particles) can be set very close to $\pi$, if has a mixing with another heavy which induces phase shift $\approx \pi$ after inflation. In simplest case, plays role inflaton, and we call such inflation as "$\pi$nflation." The basic idea was first proposed by Daido present authors in Ref. [1702.03284] 2017 more recently discussed [1903.00462]. decay constant $f_a \gtrsim 3 \times 10^9\,$ GeV explain dark matter...
We study the cutoff for cosmic-ray neutrino, set by scattering with cosmic background neutrinos into dark sector particles through a neutrino portal interaction. find that large interaction rate is still viable, when are mainly coupled to τ-neutrino, so mean free path can be reduced O(10) Mpc over wide energy range. If stable enough, particle, which most of transferred, travel across Universe and reach earth. The particle carry as O(EeV) if it originates from cosmogenic neutrino.
A bstract The long-standing muon g − 2 anomaly has been confirmed recently at the Fermilab. combined discrepancy from Fermilab and Brookhaven results shows a difference theory significance of 4.2 σ . In addition, LHC updated lower mass bound pure wino. this letter, we study to what extent can be explained in mediation scenarios, where wino is dominant dark matter component. To end, derive some model-independent constraints on particle spectra 2. We find that explanation 1 level driven into...