Results 1 to 10 of about 1,626,612 (296)
Fundamental Interactions, 2007 The nature of the main constituents of the mass of the universe is one of the outstanding riddles of cosmology and astro-particle physics. Current models explaining the evolution of the universe, and measurements of the various components of its mass ...
Zacek, Viktor
core +2 more sources
Dark Energy and Dark Matter [PDF]
Physics Letters B, 2003 It is a puzzle why the densities of dark matter and dark energy are nearly equal today when they scale so differently during the expansion of the universe. This conundrum may be solved if there is a coupling between the two dark sectors. In this paper we
A. Riotto +30 more
core +5 more sources
Dark Matter and Dark Radiation [PDF]
Physical Review D, 2008 We explore the feasibility and astrophysical consequences of a new long-range U(1) gauge field ("dark electromagnetism") that couples only to dark matter, not to the Standard Model.
E. Kolb +7 more
core +4 more sources
Physical Review D, 2021 A new $U(1)$ dark gauge group coupled to the Standard Model (SM) via the kinetic mixing portal provides a natural dark matter candidate in the form of the Higgs field, $h_d$, responsible for generating the mass of the dark photon, $ _d$. We show that the condition $m_{h_d}\leq m_{ _d}$, together with smallness of the kinetic mixing parameter ...
Cristina Mondino +3 more
openaire +2 more sources
GRB 181110A: Constraining the Jet Structure, Circumburst Medium and the Initial Lorentz Factor
Universe, 2022 The afterglow data of gamma ray bursts (GRBs) can be used to constrain the physical properties of the fireball (e.g., the jet structure and opening angle) and the circumburst medium.
Song Han +6 more
doaj +1 more source
An Unsupervised Machine Learning Method for Electron–Proton Discrimination of the DAMPE Experiment
Universe, 2022 Galactic cosmic rays are mostly made up of energetic nuclei, with less than 1% of electrons (and positrons). Precise measurement of the electron and positron component requires a very efficient method to reject the nuclei background, mainly protons.
Zhihui Xu +6 more
doaj +1 more source
Constraints on dark matter annihilation from the Event Horizon Telescope observations of M87*
Journal of High Energy Physics, 2022 The fast developments of radio astronomy open a new window to explore the properties of Dark Matter (DM). The recent direct imaging of the supermassive black hole (SMBH) at the center of M87 radio galaxy by the Event Horizon Telescope (EHT) collaboration
Guan-Wen Yuan +6 more
doaj +1 more source
The Identification of Dark Matter, 2000 Abstract: The late infall of cold dark matter onto an isolated galaxy such as our own produces flows with definite velocity vectors at any physical point in the galactic halo. It also produces caustics which are places where the dark matter density is very large. The outer caustics are topological spheres whereas the inner caustics are rings. The self‐
Sikivie, P., Kinney, W.
openaire +3 more sources
Global QCD analysis and dark photons
Journal of High Energy Physics, 2023 We perform a global QCD analysis of high energy scattering data within the JAM Monte Carlo framework, including a coupling to a dark photon that augments the Standard Model (SM) electroweak coupling via kinetic mixing with the hypercharge B boson.
N. T. Hunt-Smith +6 more
doaj +1 more source
Quasi-Periodic Pulsations in an M-Class Solar Flare
Universe, 2023 We have studied the quasi-periodic pulsations (QPPs) of the M2.3 flare that occurred in the active region NOAA 12172 on 23 September 2014. Through the fast Fourier transform (FFT) method, we decompose the flare light curves into fast- and slowly-varying ...
Jun Xu +3 more
doaj +1 more source