A5053567038- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Pulsars and Gravitational Waves Research
- Galaxies: Formation, Evolution, Phenomena
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Relativity and Gravitational Theory
- Noncommutative and Quantum Gravity Theories
- Solar and Space Plasma Dynamics
- High-Energy Particle Collisions Research
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Quantum Electrodynamics and Casimir Effect
- Underwater Acoustics Research
- Experimental and Theoretical Physics Studies
- Gaussian Processes and Bayesian Inference
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Geological formations and processes
- Distributed and Parallel Computing Systems
- Quantum, superfluid, helium dynamics
- Computational Physics and Python Applications
Institute of Theoretical Physics
2015-2024
Chinese Academy of Sciences
2015-2024
Asia Pacific Center for Theoretical Physics
2022-2024
University of Chinese Academy of Sciences
2017-2021
Korea Institute for Advanced Study
2021
Tufts University
2019-2021
Kyoto University
2017
Recently a Complexity-Action (CA) duality conjecture has been proposed, which relates the quantum complexity of holographic boundary state to action Wheeler-DeWitt (WDW) patch in anti-de Sitter (AdS) bulk. In this paper we further investigate for stationary AdS black holes and derive some exact results growth rate within at late time approximation, is supposed be dual state. Based on from general D-dimensional Reissner-Nordström (RN)-AdS hole, rotating/charged Bañados-Teitelboim-Zanelli...
The Cosmological Principle (CP) -- the notion that Universe is spatially isotropic and homogeneous on large scales underlies a century of progress in cosmology. It conventionally formulated through Friedmann-Lema\^itre-Robertson-Walker (FLRW) cosmologies as spacetime metric, culminates successful highly predictive $\Lambda$-Cold-Dark-Matter ($\Lambda$CDM) model. Yet, tensions have emerged within $\Lambda$CDM model, most notably statistically significant discrepancy value Hubble constant,...
A novel mechanism for the primordial black hole (PBH) production is proposed as a natural and inevitable consequence of general first-order phase transitions without reference to specific underlying particle physics models. We obtain mutual predictions constraints between holes gravitational waves from in case. For particular interest, our PBHs generated during PeV-scale transition could make up all dark matter, while MeV-scale simultaneously account LIGO-Virgo coalescence events NANOGrav...
Recently, a $\sim3.9\sigma$ preference for dynamical dark energy from the Dark Energy Spectroscopic Instrument (DESI) collaboration inspired hot debates on new physics or systematics. In this letter, we reveal significant is dominated by an external low-redshift supernova (low-$z$ SN) sample that combines with Survey SN program (DES-SN) in their Year 5 data release (DESY5). Further implementing $a_B$ (the intercept of magnitude-redshift relation) diagnosis between low-$z$ and DES-SN samples,...
Abstract Recent detections of a low-frequency gravitational wave background (GWB) from various pulsar-timing-array (PTA) observations have renewed the interest in inspiraling supermassive black hole binaries (SMBHBs), whose population is believed to be most promising candidate with possible generalizations including either orbital eccentricity or dark matter (DM) spike. In this paper, we show that inclusion both can further display distinctive features detectable future PTA observations....
The direct detection of gravitational wave by Laser Interferometer Gravitational-Wave Observatory indicates the coming era gravitational-wave astronomy and cosmology. It is expected that more events will be detected currently existing planned detectors. waves open a new window to explore Universe various mysteries disclosed through detection, combined with other cosmological probes. physics not only related gravitation theory, but also closely tied fundamental physics, cosmology...
If the black holes detected by LIGO/VIRGO are primordial (PBHs) sourcing from a large curvature perturbation on small scales, corresponding induced gravitational waves (GWs) would peak at nanohertz that is detectable current and future observations of pulsar timing array (PTA). In this paper we show with mass function estimated merger rate LIGO O1 O2 events, GWs such Gaussian narrow some scale be in seemingly mild tension constraints PTA. However, if local-type non-Gaussianity non-linear...
Values of the Hubble constant between direct measurements from various independent local observations and that inferred cosmic microwave background with $\Lambda$-cold-dark-matter model are in tension persistent significance. We propose a late-time inhomogeneous resolution suggesting chameleon field coupled to overdensity matter could be trapped at higher potential energy density as an effective cosmological driving expansion rate faster than lower density. illustrate this mechanism toy...
The Hubble tension, if not caused by any systematics, could be relieved or even resolved from modifying either the early-time late-time Universe. modifications are usually in tension with galaxy clustering lensing constraints. also conflict constraint inverse distance ladder, which, however, is weakened dependence on a sound-horizon prior and some particular approximation for expansion history. To achieve more general no-go argument scenarios, we propose to use global parametrization based...
The randomness of the quantum tunneling process induces superhorizon curvature perturbations during cosmological first-order phase transitions. We for first time utilize to constrain transition parameters, and find that observations cosmic microwave background spectrum distortion ultracompact minihalo abundance can give strict constraints on transitions below 100 GeV, especially low-scale some electroweak current parameters are largely extended by results this work, therefore provide an...
As a promising probe for the new physics beyond standard model of particle in early Universe, predictions stochastic gravitational wave background from cosmological first-order phase transition heavily rely on bubble wall velocity determined by expansion dynamics. The dynamics is governed competition between driving force effective potential difference and backreaction sum thermal friction induced temperature jumping out-of-equilibrium effects across wall, respectively. In this paper, we...
For a cosmological first-order phase transition in the early Universe, associated stochastic gravitational wave background is usually dominated by sound waves from plasma fluid motions, which have been analytically modeled as random superposition of freely propagating shells but with force scalar field that produces self-similar profile removed. In this Letter, we propose new analytic shell model focusing on forced contribution initial collision stage when their profiles are still maintained...
Abstract Recent reports of stochastic gravitational wave background from four independent pulsar-timing-array collaborations have renewed the interest in cosmological (CGWB), which is expected to open a new window into early Universe. Although Universe supposed be extremely flat an inflationary point view, cosmic microwave (CMB) data alone Planck satellite measurement prefers enhanced lensing amplitude that can explained by closed In this paper, we propose method constrain early-Universe...
According to the conjecture ``complexity equals action,'' complexity of a holographic state is equal action Wheeler-DeWitt (WDW) patch black holes in anti--de Sitter space. In this paper we calculate growth charged with single horizon, paying attention contribution from spacelike singularity inside horizon. We consider two kinds such holes: one dilaton hole, and other Born-Infeld hole ${\ensuremath{\beta}}^{2}{Q}^{2}<1/4$. both cases, although an electric charge appears solutions, inner...
The gravitational wave (GW) as a standard siren directly determines the luminosity distance from waveform without reference to specific cosmological model, of which redshift can be obtained separately by means electromagnetic counterpart like GW events binary neutron stars and massive black hole binaries (MBHBs). To see what extent reproduce presumed dipole anisotropy written in simulated data typical configurations detectors, we find that (1) for Laser Interferometer Space Antenna with...
Abstract Recently the thermal friction on an expanding bubble from cosmic first-order phase transition has been calculated to all orders of interactions between wall and plasma, leading a γ 2 -scaling instead previously estimated 1 for exerted fast-moving with Lorentz factor γ. We propose first time effective equation motion (EOM) in presence arbitrary γ-scaling compute efficiency collisions, which, case friction, is found be larger than recently updated estimation when walls collide after...
The primordial black hole (PBH) productions from the inflationary potential with an inflection point usually rely heavily on fine-tuning of model parameters. We propose in this work a new kind $\alpha$-attractor inflation asymmetric double poles that naturally and easily lead to period non-attractor inflation, during which PBH are guaranteed less This double-pole can be tested against observational data future rich phenomenological signatures: (1) enhanced curvature perturbations at small...
Recent attempts to fully resolve the Hubble tension from early dark energy models seem favor a primordial Harrison-Zeldovich universe with its scalar spectrum being extremely scale invariant. Restoring within single-field inflationary paradigm appears be infeasible, turning multifield approach either curvaton or waterfall models. In this Letter, we successfully align chaotic inflation by nonminimal derivative coupling, and previously disfavored potential...
We investigate the influence on inflationary predictions from reheating processes characterized by $e$-folding number $N_{\mathrm{reh}}$ and effective equation-of-state parameter $w_{\mathrm{reh}}$ during phase. For first time, can be constrained in $N_{\mathrm{reh}}\!-\!w_{\mathrm{reh}}$ plane Planck 2015. find that for Higgs inflation with a nonminimal coupling to gravity, are insensitive phase current CMB measurements. also spontaneously broken SUSY axion monodromy $\phi^{2/3}$ potential,...
We identify analytically a multiple-peak structure in the energy-density spectrum of induced gravitational waves (GWs) generated at second-order from primordial scalar perturbations also with multiple($n$) peaks small scales $k_{*i}$. The GWs exhibits most $C_{n+1}^2$ and least $n$ wave-vectors $k_{ij}\equiv(k_{*i}+k_{*j})/\sqrt{3}$ due to resonant amplification, and, under narrow-width approximation, it contains an universal factor that can be interpreted as result momentum conservation....
A simple model for the late-time cosmic acceleration problem is presented in Starobinsky inflation with a negative bare cosmological constant as well nonminimal coupling to Higgs boson. After electroweak symmetry breaking, inflaton has been frozen until very recently, becoming thawing quintessence, and comparable magnitude observed dark energy density can be achieved without fine-tuning. Our proposal essentially reduces into hierarchy problem, its behaviour also consistent recently proposed...
The Hubble tension seems to be a crisis with $\ensuremath{\sim}5\ensuremath{\sigma}$ discrepancy between the most recent local distance ladder measurement from type Ia supernovae calibrated by Cepheids and global fitting constraint cosmic microwave background data. To narrow down possible late-time solutions tension, we have used in study [Phys. Rev. D 105, L021301 (2022)] an improved inverse method absolute measurements of expansion rate at high redshifts chronometer data, found no...