A5065521278- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Noncommutative and Quantum Gravity Theories
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- Particle Detector Development and Performance
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Statistical and numerical algorithms
- Statistical Mechanics and Entropy
- Particle physics theoretical and experimental studies
- Geophysics and Gravity Measurements
- Radiation Therapy and Dosimetry
- Solar and Space Plasma Dynamics
- Radiation Detection and Scintillator Technologies
- Complex Systems and Time Series Analysis
- Adaptive optics and wavefront sensing
- Earthquake Detection and Analysis
University of Science and Technology of China
2017-2025
Purple Mountain Observatory
2016-2025
Chinese Academy of Sciences
2016-2025
First Affiliated Hospital of Jinan University
2023-2024
University of Amsterdam
2024
Netherlands Institute for Neuroscience
2024
North China Electric Power University
2024
Tongji University
2024
University of Chinese Academy of Sciences
2014-2021
Guangxi University
2012-2021
We present a time-resolved spectral analysis of 51 long and 11 short bright GRBs observed with the {\em Femri}/GBM, paying special attention to $E_{\rm p}$ evolution within same burst. Among 8 single-pulse GRBs, 5 show hard-to-soft evolution, while 3 intensity-tracking. The multi-pulse have more complicated patterns. whose spectrum is available for first pulse, almost half (15/32 GRBs) clear other (17/32 Later pulses typically tracking behavior, although pattern was identified in 2nd pulse 2...
The accuracy of Einstein's equivalence principle (EEP) can be tested with the observed time delays between correlated particles or photons that are emitted from astronomical sources. Assuming as a lower limit caused mainly by gravitational potential Milky Way, we prove fast radio bursts (FRBs) cosmological origin used to constrain EEP high accuracy. Taking FRB 110220 and two possible FRB/gamma-ray burst (GRB) association systems (FRB/GRB 101011A FRB/GRB 100704A) examples, obtain strict upper...
Fast radio bursts (FRBs) are characterized by millisecond durations, high Galactic latitude positions, and dispersion measures. Very recently, the cosmological origin of FRB 150418 has been confirmed \cite{kea16}, FRBs now strong competitors as probes. The simple sharp feature signal is ideal for them to probe some fundamental laws physics. Here we show that analyzing delay time between different frequencies, data can place stringent upper limits on rest mass photon. For at $z=0.492$, one...
In this paper, we continue to build support for the proposal use gamma-ray bursts (GRBs) as standard candles in constructing Hubble Diagram at redshifts beyond current reach of Type Ia supernova observations. We confirm that correlations among certain spectral and lightcurve features can indeed be used luminosity indicators, demonstrate from most up-to-date GRB sample appropriate work $\Lambda$CDM model optimized with these data is characterized by parameter values consistent those...
To take advantage of the astrophysical potential Gamma-Ray Bursts (GRBs), Chinese and French astrophysicists have engaged SVOM mission (Space-based multi-band astronomical Variable Objects Monitor). Major advances in GRB studies resulting from synergy between space ground observations, implements instrumentation. The scientific objectives put a special emphasis on two categories GRBs: very distant GRBs at z$>$5 which constitute exceptional cosmological probes, faint/soft nearby allow...
The use of Type~Ia SNe has thus far produced the most reliable measurement expansion history Universe, suggesting that $\Lambda$CDM offers best explanation for redshift--luminosity distribution observed in these events. But analysis other kinds source, such as cosmic chronometers, gamma ray bursts, and high-$z$ quasars, conflicts with this conclusion, indicating instead constant rate implied by $R_{\rm h}=ct$ Universe is a better fit to data. central difficulty standard candles one must...
The detection of gravitational waves (GWs) provides a direct way to measure the luminosity distance, which enables us probe cosmology. In this paper, we continue expand application GW standard sirens in cosmology, and propose that spatial curvature can be estimated model-independent by comparing distances from future sources current cosmic-chronometer observations. We expect an electromagnetic counterpart event give source redshift, simulate hundreds data coalescence double neutron stars...
The dispersion measure (DM)--redshift relation of fast radio bursts (FRBs) has been proposed as a potential new tool for probing intergalactic medium (IGM) and studying cosmology. However, the poor knowledge baryon fraction in IGM ($f_{\mathrm{IGM}}$) its degeneracy with cosmological parameters impose restrictions on applications FRBs. Furthermore, DMs contributed by ($\mathrm{DM_{IGM}}$) host galaxy ($\mathrm{DM_{host}}$), important quantities, cannot be exactly extracted from observations,...
The principal goal of this paper is to use attempts at reconciling the Swift long gamma-ray bursts (LGRBs) with star formation history (SFH) compare predictions $\Lambda$CDM those in $R_{\rm h}=ct$ Universe. In context former, we confirm that latest sample GRBs reveals an increasing evolution GRB rate relative (SFR) high redshifts. observed discrepancy between and SFR may be eliminated by assuming a modest parameterized as $(1+z)^{0.8}$---perhaps indicating cosmic metallicity. However, find...
Abstract Possible violations of Lorentz invariance (LIV) have been investigated for a long time using the observed spectral lags gamma-ray bursts (GRBs). However, these generally relied on single photon in highest energy range. Furthermore, search LIV has hindered by our ignorance concerning intrinsic lag different bands. GRB 160625B, only burst so far with well-defined transition from positive to negative provides unique opportunity put new constraints LIV. Using multi-photon bands we...
A conservative constraint on Einstein's weak equivalence principle (WEP) can be obtained under the assumption that observed time delay between correlated particles from astronomical sources is dominated by gravitational fields through which they move. Current limits WEP are mainly based delays of photons with different energies. It highly desirable to develop more accurate tests include wave (GW) sector. The detection advanced LIGO/VIRGO systems waves will provide attractive candidates for...
In this paper, we propose an improved model-independent method to constrain the cosmic curvature by combining most recent Hubble parameter $H(z)$ and supernovae Ia (SNe Ia) data. Based on data, first use smoothing technique, Gaussian processes, construct distance modulus $\mu_{H}(z)$, which is susceptible $\Omega_{k}$. contrary previous studies, light-curve fitting parameters, account for estimation of SN ($\mu_{SN}(z)$), are set free investigate whether $\Omega_{k}$ has a dependence them....
Five fast radio bursts (FRBs), including three apparently non-repeating ones FRB 180924, 181112, and 190523, two repeaters, 121102 180916.J0158+65, have already been localized so far. We apply a method developed recently by us (Li et al. 2019) to these five FRBs give cosmology-insensitive estimate of the fraction baryon mass in IGM, $f_{\rm IGM}$. Using measured dispersion measure (DM) luminosity distance $d_{\rm L}$ data (inferred from redshifts type Ia supernovae at same redshifts) FRBs,...
We use the age measurements of 114 old astrophysical objects (OAO) in redshift range $0\lesssim z\lesssim 8$ to explore Hubble tension. The Universe at any $z$ is inversely proportional constant, $H_0$, so requiring be older than OAO it contains will lead an upper limit on $H_0$. Assuming flat $\Lambda$CDM and setting a Gaussian prior matter density parameter $\Omega_{\rm m}=0.315\pm0.007$ informed by {\it Planck}, we obtain 95\% confidence-level $H_0<70.6 \rm{~km} \rm{~s}^{-1}...
Abstract We use the dispersion measure (DM) and redshift measurements of 24 localized fast radio bursts (FRBs) to compare cosmological models investigate Hubble tension. Setting a flat prior on DM contribution from Milky Way’s halo, <?CDATA ${\mathrm{DM}}_{\mathrm{halo}}^{\mathrm{MW}}\in [5,\,80]\,\mathrm{pc}\,{\mathrm{cm}}^{-3}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mi>DM</mml:mi> </mml:mrow> <mml:mi>halo</mml:mi>...
We continue to build support for the proposal use HII galaxies (HIIGx) and giant extragalactic regions (GEHR) as standard candles construct Hubble diagram at redshifts beyond current reach of Type Ia supernovae. Using a sample 25 high-redshift HIIGx, 107 local 24 GEHR, we confirm that correlation between emission-line luminosity ionized-gas velocity dispersion is viable indicator, it test compare model $Λ$CDM $R_{\rm h}=ct$ Universe by optimizing parameters in each cosmology using...
The coincident detection of a gravitational-wave (GW) event GW170817 with electromagnetic (EM) signals (e.g., short gamma-ray burst SGRB 170817A or macronova) from binary neutron star merger within the nearby galaxy NGC 4933 provides new, multimessenger test weak equivalence principle (WEP), extending WEP GWs and photons. Assuming that arrival time delay between GW photons macronova is mainly attributed to gravitational potential Milky Way, we demonstrate strict upper limits on deviation are...
The spectral lags of gamma-ray bursts (GRBs) have been viewed as the most promising probes possible violations Lorentz invariance (LIV). However, these constraints usually depend on assumption unknown intrinsic time lag in different energy bands and use a single highest-energy photon. A new approach to test LIV effects has proposed by directly fitting behavior GRB with well-defined transition from positive negative lags. This method simultaneously provides reasonable formulation robust lower...
Abstract With the distance sum rule in Friedmann–Lemaître–Robertson–Walker metric, model-independent constraints on both Hubble constant H 0 and spatial curvature <?CDATA ${{\rm{\Omega }}}_{K}$?> can be obtained using strong lensing time-delay data Type Ia supernovae (SNe Ia) luminosity distances. This method is limited by relatively low redshifts of SNe Ia, however. Here, we propose quasars as indicators, extending coverage to encompass redshift range systems. We provide a novel improved...
Abstract We present a new model-independent method to determine spatial curvature and mitigate the circularity problem affecting use of quasars as distance indicators. Cosmic-chronometer measurements are used construct curvature-dependent luminosity <?CDATA ${D}_{L}^{\mathrm{cal}}({{\rm{\Omega }}}_{K},z)$?> using polynomial fit. Based on reconstructed known ultraviolet versus X-ray correlation quasars, we simultaneously place limits parameter Ω K parameters characterizing function. This...
Abstract The recent discoveries of a remarkable glitch/antiglitch accompanied by fast radio burst (FRB)-like bursts from the Galactic magnetar SGR J1935+2154 have revealed physical connection between two. In this work, we study statistical properties hyperactive repeating source FRB 20201124A and glitches pulsar PSR B1737–30. For 20201124A, confirm that probability density functions fluctuations energy, peak flux, duration, waiting time well follow Tsallis q -Gaussian distribution. derived...