A5035585224- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Astronomy and Astrophysical Research
- Scientific Research and Discoveries
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Astrophysics and Star Formation Studies
- Advanced Thermodynamics and Statistical Mechanics
- Particle Detector Development and Performance
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Blockchain Technology Applications and Security
- Regional Development and Environment
- Environmental Sustainability in Business
- Environmental Impact and Sustainability
- FinTech, Crowdfunding, Digital Finance
- Earth Systems and Cosmic Evolution
- Geophysics and Gravity Measurements
- Climate Change Policy and Economics
- Radio Astronomy Observations and Technology
- Quantum Mechanics and Applications
Shandong Youth University of Political Science
2022-2024
Lawrence Berkeley National Laboratory
2023-2024
University of California, Berkeley
2023-2024
Harvard University
2018-2023
Harvard University Press
2020
Qilu Normal University
2016-2017
Electro Optical Systems (Germany)
2015
We derive new limits on the elastic scattering cross section between baryons and dark matter using cosmic microwave background data from Planck satellite measurements of Lyman-alpha forest flux power spectrum Sloan Digital Sky Survey. Our analysis addresses generic sections form $\ensuremath{\sigma}\ensuremath{\propto}{v}^{n}$, where $v$ is matter--baryon relative velocity, allowing for constraints independent specific particle physics models. include high-$\ensuremath{\ell}$ polarization in...
The precise measurement of cosmic-ray antinuclei serves as an important means for identifying the nature dark matter and other new astrophysical phenomena, could be used with species to understand production propagation in Galaxy. For instance, low-energy antideuterons would provide a "smoking gun" signature annihilation or decay, essentially free background. Studies recent years have emphasized that models must considered together abundant cosmic antiprotons any potential observation...
Our current understanding of the Universe is established through pristine measurements structure in cosmic microwave background (CMB) and distribution shapes galaxies tracing large scale (LSS) Universe. One key ingredient that underlies cosmological observables field sources observed assumed to be initially Gaussian with high precision. Nevertheless, a minimal deviation from Gaussianityis perhaps most robust theoretical prediction models explain Universe; itis necessarily present even...
Many scenarios of physics beyond the standard model predict new light, weakly coupled degrees freedom, populated in early universe and remaining as cosmic relics today. Due to their high abundances, these can significantly affect evolution universe. For instance, massless produce a shift $\Delta N_{\rm eff}$ expectation effective number active neutrinos. Massive relics, on other hand, additionally become part cosmological dark matter later universe, though light nature allows them freely...
Dark matter (DM) in the Milky Way halo may annihilate or decay to photons, producing monochromatic gamma rays. We search for DM-induced spectral lines using 14 years of data from Large Area Telescope onboard Fermi Gamma-ray Space ($\textit{Fermi}$-LAT) between $10\,\mathrm{GeV}$ and $2\,\mathrm{TeV}$ inner leveraging both spatial morphology an expected signal. present new constraints as strong $\langle \sigma v \rangle \lesssim 6\times 10^{-30}\, \mathrm{cm}^3/\mathrm{s}$ two-to-two...
This study analyses the relationship between greenwashing behaviour, a lack of government supervision, and imperfect green certification mechanisms in China. To improve governance light rent-seeking behaviour high-pollution enterprises third-party institutions (GCIs), we construct tripartite game model for system using an evolutionary analyse interaction trajectory three parties. Our results indicate that increasing local incentives penalties not only facilitate strengthened by do greenwash...
Thermal Higgsino dark matter (DM), with mass around 1 TeV, is a well-motivated, minimal DM scenario that arises in supersymmetric extensions of the standard model. Higgsinos may naturally be lightest superpartners split-supersymmetry models decouple scalar while keeping and gauginos close to TeV scale. annihilate today give continuum γ-ray emission at energies less than addition linelike signature equal mass. Previous searches for DM, example H.E.S.S. telescope, have not reached necessary...
Cosmological data provide a powerful tool in the search for physics beyond Standard Model (SM). An interesting target are light relics, new degrees of freedom which decoupled from SM while relativistic. Nearly massless relics contribute to radiation energy budget, and commonly parametrized as variations effective number ${N}_{\mathrm{eff}}$ neutrino species. Additionally, with masses greater than ${10}^{\ensuremath{-}4}\text{ }\text{ }\mathrm{eV}$ become nonrelativistic before today, thus...
A promising avenue to measure the total, and potentially individual, mass of neutrinos consists leveraging cosmological datasets, such as cosmic microwave background surveys large-scale structure universe. In order obtain unbiased estimates neutrino mass, however, many effects ought be included. Here we forecast, via a Markov Chain Monte Carlo likelihood analysis, whether measurements by two galaxy surveys: DESI {\it Euclid}, when added CMB-S4 experiment, are sensitive that can alter...
A bstract The chromo-natural inflation (CNI) scenario predicts a potentially detectable chiral gravitational wave signal, generated by Chern-Simons coupling between rolling scalar axion field and an SU(2) gauge with isotropy-preserving classical background during inflation. However, the generation of this signal requires very large integer level, which can be challenging to explain or embed in UV-complete model. We show that challenge persists phenomenologically viable spectator CNI (S-CNI)...
A bstract In this work, we present UV completions of the recently proposed number-changing Co-SIMP freeze-out mechanism. contrast to standard cannibalistic-type dark matter picture that occurs entirely in sector, 3 → 2 process setting relic abundance case requires one Standard Model particle initial and final states. This prevents sector from overheating leads rich experimental signatures. We generate interaction with a consisting two scalars, mediator coupling either nucleons or electrons....
Abstract From stellar spectra, a variety of physical properties stars can be derived. In particular, the chemical composition atmospheres inferred from absorption line analyses. These provide key information on large scales, such as formation our Galaxy, down to small‐scale nucleosynthesis processes that take place in and supernovae. By extending observed wavelength range toward bluer wavelengths, we optimize studies also include critical lines metal‐poor stars, allow for heavy elements ( Z...
The nature of dark matter is one the major puzzles fundamental physics, integral to understanding our universe across almost every epoch. search for takes place at different energy scales, and use data ranging from particle colliders astrophysical surveys. We focus here on CMB-S4, a future ground-based Cosmic Microwave Background (CMB) experiment, which expected provide exquisite measurements CMB temperature polarization anisotropies. These (on their own in combination with other surveys)...
Thermal Higgsino dark matter (DM), with a mass near 1.1 TeV, is one of the most well-motivated and untested DM candidates. Leveraging recent hydrodynamic cosmological simulations that give density profiles in Milky Way analog galaxies we show linelike gamma-ray signal predicted from annihilation Galactic Center could be detected at high significance upcoming Cherenkov Telescope Array (CTA) Southern Wide-field Gamma-ray Observatory (SWGO) for all but pessimistic profiles. We perform sensitive...
We summarize progress made in theoretical astrophysics and cosmology over the past decade areas of interest for coming decade. This Report is prepared as TF09 "Astrophysics Cosmology" topical group summary Theory Frontier part Snowmass 2021 process.
A bstract statistically significant excess of gamma rays has been reported and robustly confirmed in the Galactic Center over past decade. Large local dark matter densities suggest that this Excess (GCE) may be attributable to new physics, indeed it shown signal is well-modelled by annihilations dominantly into $$ b\overline{b} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>b</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> with a WIMP-scale cross section....
Many well-motivated extensions of the Standard Model predict existence new light species that may have been produced in early universe. Prominent examples include axions, sterile neutrinos, gravitinos, dark photons, and more. The gravitational influence relics leaves imprints cosmic microwave background fluctuations, large-scale structure universe primordial element abundances. In this paper, we detail physics cosmological relics, describe how measurements their relic density mass serve as...
Opening up a new window of millimeter-wave observations that span frequency bands in the range 30 to 500 GHz, survey half sky, and are both an order magnitude deeper (about 0.5 uK-arcmin) higher-resolution 10 arcseconds) than currently funded surveys would yield enormous gain understanding fundamental physics astrophysics. In particular, such allow for major advances measuring distribution dark matter gas on small-scales, needed insight 1.) particle properties, 2.) evolution galaxies, 3.)...
Low energy antideuteron detection presents a unique channel for indirect detection, targeting dark matter that annihilates into hadrons in relatively background-free way. Since the idea was first proposed, many WIMP-type models have already been disfavored by direct experiments, and current constraints indicate any thermal relic candidates likely annihilate through some hidden sector process. In this paper, we show cosmic ray experiments represent one of best ways to search matter,...
Abstract The leading tensions to the collisionless cold dark matter (CDM) paradigm are “small-scale controversies,” discrepancies between observations at dwarf-galactic scale, and their simulational counterparts. In this work we consider methods infer 3D morphological information on Local Group dwarf spheroidals test fitness of CDM+hydrodynamics simulations observed galaxy shapes. We find that subpopulation galaxies with mass-to-light ratio <?CDATA $\gtrsim 100{M}_{\odot }/{L}_{\odot }$?>...
Thermal higgsino dark matter (DM), with a mass near 1.1 TeV, is one of the most well-motivated and untested DM candidates. Leveraging recent hydrodynamic cosmological simulations that give density profiles in Milky Way analogue galaxies we show line-like gamma-ray signal predicted from annihilation Galactic Center could be detected at high significance upcoming Cherenkov Telescope Array (CTA) Southern Wide-field Gamma-ray Observatory (SWGO) for all but pessimistic profiles. We perform...
<title>Abstract</title> The progress of computer technology has given the Internet Things (IoT) a better development space, and also promoted wide application blockchain under IoT. NFT (Non-Fungible Token) technology, which is derivative, generated vast amount buzz with meta-universe. essence metauniverse digital twin space based on blockchain. universe economy cannot operate freely. It needs to blend interact real economy. value anchor plays an important role in metacosmic In order play...