Results 61 to 70 of about 2,716,965 (190)

Enhanced n-body annihilation of dark matter and its indirect signatures

Journal of High Energy Physics, 2019
We examine the possible indirect signatures of dark matter annihilation processes with a non-standard scaling with the dark matter density, and in particular the case where more than two dark matter particles participate in the annihilation process.
Mohammad Hossein Namjoo, Tracy R. Slatyer, Chih-Liang Wu   +2 more
doaj   +1 more source

New Light Species and the CMB

, 2013
We consider the effects of new light species on the Cosmic Microwave Background. In the massless limit, these effects can be parameterized in terms of a single number, the relativistic degrees of freedom.
Brust, Christopher, Kaplan, David E., Walters, Matthew T.   +2 more
core   +1 more source

Comparison of the Distribution of the In Situ Ring Current Density Based on Magnetic Field Observations From THEMIS, MMS and Cluster

Journal of Geophysical Research: Space Physics, Volume 130, Issue 3, March 2025.
Abstract We review and extend previous work on the ring current density distribution by applying the curlometer technique to multi‐spacecraft magnetic field data on different spatial scales, directly comparing the results of three space missions: Time History of Events and Macroscale Interactions during Substorms (THEMIS), The Magnetospheric Multiscale
X. Tan, M. W. Dunlop, Y. Y. Yang, C. T. Russell, C. P. Escoubet   +4 more
wiley   +1 more source

Axion global fits with Peccei-Quinn symmetry breaking before inflation using GAMBIT

Journal of High Energy Physics, 2019
We present global fits of cosmologically stable axion-like particle and QCD axion models in the mass range 0.1 neV to 10 eV. We focus on the case where the Peccei-Quinn symmetry is broken before the end of inflation, such that the initial value of the ...
Sebastian Hoof, Felix Kahlhoefer, Pat Scott, Christoph Weniger, Martin White   +4 more
doaj   +1 more source

Quantum Yang--Mills Dark Energy

, 2016
In this short review, I discuss basic qualitative characteristics of quantum non-Abelian gauge dynamics in the non-stationary background of the expanding Universe in the framework of the standard Einstein--Yang--Mills formulation.
Pasechnik, Roman
core   +2 more sources

Collection and In Situ Analyses of Regolith Samples by the Mars 2020 Rover: Implications for Their Formation and Alteration History

Journal of Geophysical Research: Planets, Volume 130, Issue 2, February 2025.
Abstract The Perseverance rover has sampled mm‐size lithic fragments containing olivine likely from at least two source regions from the surface of an inactive megaripple surface, and fine‐grained material from the surface and to a depth of ∼4–6 cm. Some of the mm‐size grains lack a coherent diffraction pattern measured by PIXL, consistent with the ...
E. M. Hausrath, R. Sullivan, Y. Goreva, M. P. Zorzano, A. Vaughan, A. Cousin, S. Siljeström, S. Sharma, A. O. Shumway, T. Kizovski, S. J. VanBommel, M. Tice, A. Knight, G. Martinez, A. Vicente‐Retortillo, L. Mandon, C. T. Adcock, J. M. Madariaga, I. Población, J. R. Johnson, J. Lasue, O. Gasnault, N. Randazzo, E. L. Cardarelli, R. Kronyak, A. Bechtold, G. Paar, A. Udry, O. Forni, C. C. Bedford, N. A. Carman, J. F. Bell III, K. Benison, T. Bosak, A. Brown, A. Broz, F. Calef, B. C. Clark, E. Cloutis, A. D. Czaja, T. Fornaro, T. Fouchet, M. Golombek, F. Gómez, C. D. K. Herd, K. Herkenhoff, R. S. Jakubek, L. Jandura, J. Martinez‐Frias, L. E. Mayhew, P.‐Y. Meslin, C. E. Newman, J. I. Núñez, F. Poulet, C. Royer, P. Russell, M. A. Sephton, S. K. Sharma, D. Shuster, J. I. Simon, I. Tirona, R. C. Wiens, B. P. Weiss, A. J. Williams, K. Williford, Z. U. Wolf, the Regolith Working Group   +66 more
wiley   +1 more source

Coscattering/coannihilation dark matter in a fraternal twin Higgs model

Journal of High Energy Physics, 2018
Dark matter candidates arise naturally in many models that address the hierarchy problem. In the fraternal twin Higgs model which could explain the absence of the new physics signals at the Large Hadron Collider (LHC), there are several viable dark ...
Hsin-Chia Cheng, Lingfeng Li, Rui Zheng
doaj   +1 more source

WIMP cogenesis for asymmetric dark matter and the baryon asymmetry

Journal of High Energy Physics, 2020
We propose a new mechanism where asymmetric dark matter (ADM) and the baryon asymmetry are both generated in the same decay chain of a metastable weakly interacting massive particle (WIMP) after its thermal freezeout.
Yanou Cui, Michael Shamma
doaj   +1 more source

Physics of the linear collider

, 2003
This presentation intends to illustrate the specific capabilities of an e$^+$e$^-$ sub-TeV collider to provide answers on the basic issues in physics: origin of mass, hierarchy of masses, cosmological problems.
F. RICHARD, Rizzo T. G.
core   +2 more sources

On chirality of the vorticity of the Universe [PDF]

, 2012
We study chirality of the vorticity of the Universe within the Einstein-Cartan cosmology. The role of the spin of fermion species during the evolution of the Universe is studied by averaged spin densities and Einstein-Cartan equations.
Palle, Davor
core   +3 more sources