Zi-Qing Xia
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View article: Constraints on axionlike particles from 16.5 years of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>F</mml:mi><mml:mi>e</mml:mi><mml:mi>r</mml:mi><mml:mi>m</mml:mi><mml:mi>i</mml:mi></mml:math>-LAT data and prospects for VLAST
Constraints on axionlike particles from 16.5 years of -LAT data and prospects for VLAST Open
Axionlike particles (ALPs), hypothetical particles beyond the Standard Model (SM), are considered as promising dark matter candidates. ALPs can convert into photons and vice versa in a magnetic field via the Primakoff effect, potentially g…
View article: Searching for Axionlike Particles with X-Ray Observations of Alpha Centauri
Searching for Axionlike Particles with X-Ray Observations of Alpha Centauri Open
We investigate the production of axion-like particles (ALPs) in stellar cores, where they interact with electromagnetic fields and electrons, with typical masses between $\mathcal O(0.1)$ and $\mathcal O(10)$ keV. These low-energy ALPs are…
View article: Exploring semirelativistic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-wave dark matter annihilation in minimal Higgs portal near supermassive black hole
Exploring semirelativistic -wave dark matter annihilation in minimal Higgs portal near supermassive black hole Open
We conduct a comprehensive analysis of potential annihilation processes of light dark matter (DM) in minimal Higgs portal models near the supermassive black hole [Sagittarius ⋆ (Sgr A⋆)] in the Galactic Center, considering interactions be…
View article: Measurement of separate electron and positron spectra from 10 GeV to 20GeV with the geomagnetic field on DAMPE
Measurement of separate electron and positron spectra from 10 GeV to 20GeV with the geomagnetic field on DAMPE Open
The cosmic-ray (CR) electrons and positrons in space are of great significance for studying the origin and propagation of cosmic-rays. The satellite-borne experiment DArk Matter Particle Explorer (DAMPE) has been used to measure the separa…
View article: Gamma-Ray Millisecond Pulsars: Off-pulse Emission Characteristics, Phase-Resolved Pseudo-Luminosity--Cutoff Energy Correlation, and High-energy Pulsed Emission
Gamma-Ray Millisecond Pulsars: Off-pulse Emission Characteristics, Phase-Resolved Pseudo-Luminosity--Cutoff Energy Correlation, and High-energy Pulsed Emission Open
Millisecond pulsars (MSPs) are prominent GeV $γ$-ray emitters, but their emission mechanisms, especially during off-pulse phases and at high energies, remain debated. We analyze 38 MSPs using approximately 15 years of $Fermi$-LAT data. Emp…
View article: Exploring semi-relativistic $p$-wave dark matter annihilation in minimal Higgs portal near supermassive black hole
Exploring semi-relativistic $p$-wave dark matter annihilation in minimal Higgs portal near supermassive black hole Open
We conduct a comprehensive analysis of potential annihilation processes of light dark matter (DM) in minimal Higgs portal models near supermassive black hole (Sgr A$^{\star}$) in the Galactic Center, considering interactions between DM par…
View article: Evidence for the Sombrero Galaxy as an Accelerator of the Highest-Energy Cosmic Rays
Evidence for the Sombrero Galaxy as an Accelerator of the Highest-Energy Cosmic Rays Open
Ultrahigh-energy cosmic rays (UHECRs) are the highest energy messenger from space, with energies exceeding 1 EeV. Although UHECRs were discovered over 60 years ago, their origin still remains a mystery. Pinpointing sources of UHECRs is cru…
View article: Searching accretion-enhanced dark matter annihilation signals in the Galactic Centre
Searching accretion-enhanced dark matter annihilation signals in the Galactic Centre Open
A bstract This study reanalyzes the detection prospects of dark matter (DM) annihilation signals in the Galactic Center, focusing on velocity-dependent dynamics within a spike density near the supermassive black hole (Sgr A ⋆ ). We investi…
View article: A $\sim 43$ GeV $γ$-ray line signature in the directions of a group of nearby massive galaxy clusters
A $\sim 43$ GeV $γ$-ray line signature in the directions of a group of nearby massive galaxy clusters Open
As the largest gravitationally bound objects in the Universe, galaxy clusters have provided the first piece of evidence for the presence of dark matter and may be suitable targets for indirect dark matter searches. Among various signals, t…
View article: Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre
Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre Open
This study reanalyzes the detection prospects of dark matter (DM) annihilation signals in the Galactic Center, focusing on velocity-dependent dynamics within a spike density near the supermassive black hole (Sgr~A$^{\star}$). We investigat…
View article: GRB 231115A: A Nearby Magnetar Giant Flare or a Cosmic Short Gamma-Ray Burst?
GRB 231115A: A Nearby Magnetar Giant Flare or a Cosmic Short Gamma-Ray Burst? Open
There are two classes of gamma-ray transients with a duration shorter than 2 s. One consists of cosmic short gamma-ray bursts (GRBs) taking place in the deep Universe via the neutron star mergers, and the other is the magnetar giant flares…
View article: Constraining axion-like particles dark matter in Coma Berenices with FAST
Constraining axion-like particles dark matter in Coma Berenices with FAST Open
Axions and axion-like particles (ALPs) appear in many extensions of the\nStandard Model and are being investigated as promising dark matter (DM)\ncandidates. One viable methodology for their detection involves the\ninvestigation of the lin…
View article: FLASH LiDAR SINGLE PHOTON IMAGING OVER 50 KM
FLASH LiDAR SINGLE PHOTON IMAGING OVER 50 KM Open
In order to demonstrate the feasibility of single-photon imaging of flash lidar in the permanent shadow area of the moon, a set of space-based single-photon imaging system is designed, including the lidar based on VCSEL array, the optical …
View article: GRB 231115A: a nearby Magnetar Giant Flare or a cosmic Short Gamma-Ray Burst?
GRB 231115A: a nearby Magnetar Giant Flare or a cosmic Short Gamma-Ray Burst? Open
There are two classes of gamma-ray transients with a duration shorter than 2 seconds. One consists of cosmic short Gamma-Ray Bursts (GRBs) taking place in the deep universe via the neutron star mergers, and the other is the magnetar giant …
View article: Gluon condensation: from nucleon to Galactic center
Gluon condensation: from nucleon to Galactic center Open
The Galactic Center Excess (GCE), one of the most remarkable discoveries by Fermi-LAT, has prompted extensive exploration over the past decade, often attributed to dark matter or millisecond pulsars. This work proposes a novel interpretati…
View article: Discovery of the Ultra-High-Energy gamma-ray source LHAASO J2002+3238 spatially associated with SNR G69.7+1.0
Discovery of the Ultra-High-Energy gamma-ray source LHAASO J2002+3238 spatially associated with SNR G69.7+1.0 Open
The origin of Galactic PeV cosmic rays is still under debate. Shell-type supernova remnants (SNRs) are proposed to be one of the candidate sources of Galactic PeV cosmic rays, but observational evidence is lacking. Here we report LHAASO’s …
View article: A Broken “α–intensity” Relation Caused by the Evolving Photosphere Emission and the Nature of the Extraordinarily Bright GRB 230307A
A Broken “α–intensity” Relation Caused by the Evolving Photosphere Emission and the Nature of the Extraordinarily Bright GRB 230307A Open
GRB 230307A is one of the brightest gamma-ray bursts detected so far. With the excellent observation of GRB 230307A by the Fermi Gamma-ray Burst Monitor, we can reveal the details of prompt emission evolution. As found in high time-resolut…
View article: Constraining ultralight dark matter using the Fermi-LAT pulsar timing array
Constraining ultralight dark matter using the Fermi-LAT pulsar timing array Open
Ultralight dark matter (ULDM) is proposed as a theoretical candidate of dark matter particles with masses of approximately $10^{-22}$ eV. The interactions between ULDM particles and standard model particles would cause variations in pulse …
View article: A broken "$α$-intensity" relation caused by the evolving photosphere emission and the nature of the extraordinarily bright GRB 230307A
A broken "$α$-intensity" relation caused by the evolving photosphere emission and the nature of the extraordinarily bright GRB 230307A Open
GRB 230307A is one of the brightest gamma-ray bursts detected so far. With the excellent observation of GRB 230307A by Fermi-GBM, we can reveal the details of prompt emission evolution. As found in high-time-resolution spectral analysis, t…
View article: Multi-frequency test of dark matter annihilation into long-lived particles in Sirius
Multi-frequency test of dark matter annihilation into long-lived particles in Sirius Open
New long-lived particles produced at the colliders may escape from conventional particle detectors. Using satellites or ground telescopes, we can detect the photons generated from the annihilation of the star-captured dark matter into a pa…
View article: An inter-galactic magnetic field strength of ~ 4 x 10-17 G inferred with GRB 221009A
An inter-galactic magnetic field strength of ~ 4 x 10-17 G inferred with GRB 221009A Open
The delayed GeV-TeV cascade emission from extragalactic TeV-PeV sources are regarded as an ideal probe of the inter-galactic magnetic fields. Recently, LHAASO has detected ~10 TeV emission of the extraordinary powerful GRB 221009A within ~…
View article: Mental States and Cognitive Performance Monitoring for User-Centered e-Learning System: A Case Study
Mental States and Cognitive Performance Monitoring for User-Centered e-Learning System: A Case Study Open
The unprecedented long-term online learning caused by COVID-19 has increased stress symptoms among students. The e-learning system reduces communications between teachers and students, making it difficult to observe student’s mental issues…
View article: A delayed 400 GeV photon from GRB 221009A and implication on the intergalactic magnetic field
A delayed 400 GeV photon from GRB 221009A and implication on the intergalactic magnetic field Open
Large High Altitude Air Shower Observatory has detected $0.2-13$ TeV emission of GRB 221009A within 2000 s since the trigger. Here we report the detection of a 400 GeV photon, without accompanying prominent low-energy emission, by Fermi La…
View article: Explaining the GeV antiproton/$γ-$ray excesses and W-boson mass anomaly in an inert two Higgs doublet model
Explaining the GeV antiproton/$γ-$ray excesses and W-boson mass anomaly in an inert two Higgs doublet model Open
For the newly discovered $W$-boson mass anomaly, one of the simplest dark matter (DM) models that can account for the anomaly without violating other astrophysical/experimental constraints is the inert two Higgs doublet model, in which the…
View article: High-precision search for dark photon dark matter with the Parkes Pulsar Timing Array
High-precision search for dark photon dark matter with the Parkes Pulsar Timing Array Open
The nature of dark matter remains obscure in spite of decades of experimental\nefforts. The mass of dark matter candidates can span a wide range, and its\ncoupling with the Standard Model sector remains uncertain. All these unknowns\nmake …
View article: High-precision search for dark photon dark matter with the Parkes Pulsar Timing Array
High-precision search for dark photon dark matter with the Parkes Pulsar Timing Array Open
The nature of dark matter remains obscure in spite of decades of experimental efforts. The mass of dark matter candidates can span a wide range, and its coupling with the Standard Model sector remains uncertain. All these unknowns make the…