Results 1 to 10 of about 1,660,126 (341)

Modified Dark Matter: Relating Dark Energy, Dark Matter and Baryonic Matter [PDF]

International Journal of Modern Physics D, 2017
Modified dark matter (MDM) is a phenomenological model of dark matter, inspired by gravitational thermodynamics. For an accelerating Universe with positive cosmological constant ($\Lambda$), such phenomenological considerations lead to the emergence of a
Edmonds, Douglas, Farrah, Duncan, Minic, Djordje, Ng, Y. Jack, Takeuchi, Tatsu   +4 more
core   +6 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, Amendola, Amendola, Amendola, Anderson, Carlstrom, Carroll, Casas, D. Comelli, de Bernardis, Ellis, Ellis, Ellis, Ellis, Fornengo, Gasperini, Giudice, Joyce, Joyce, Kolb, M. Pietroni, Nihei, Olive, Olive, Peebles, Perlmutter, Pietroni, Riess, Salati, Stompor, Tocchini-Valentini   +30 more
core   +5 more sources

Dark Matter "Collider" from Inelastic Boosted Dark Matter [PDF]

Physical Review Letters, 2016
We propose a novel dark matter (DM) detection strategy for the models with non-minimal dark sector. The main ingredients in the underlying DM scenario are a boosted DM particle and a heavier dark sector state.
Kim, Doojin, Park, Jong-Chul, Shin, Seodong   +2 more
core   +3 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, L. B. Okun, L. B. Okun, Lotty Ackerman, Marc Kamionkowski, Matthew R. Buckley, P. J. E. Peebles, Sean M. Carroll   +7 more
core   +4 more sources

Dark Higgs dark matter [PDF]

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, Maxim Pospelov, Joshua T. Ruderman, Oren Slone   +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, Xinyu Li, Luyao Jiang, Zhiping Jin, Haoning He, Yuanzhu Wang, Daming Wei   +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, Xiang Li, Mingyang Cui, Chuan Yue, Wei Jiang, Wenhao Li, Qiang Yuan   +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, Zhan-Fang Chen, Zhao-Qiang Shen, Wen-Qing Guo, Ran Ding, Xiaoyuan Huang, Qiang Yuan   +6 more
doaj   +1 more source

Dark Matter Caustics [PDF]

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, W. Melnitchouk, N. Sato, A. W. Thomas, X. G. Wang, M. J. White, on behalf of the Jefferson Lab Angular Momentum (JAM) collaboration   +6 more
doaj   +1 more source