Results 231 to 240 of about 32,489 (252)

Galaxy and Structure Formation with Hot Dark Matter and Cosmic Strings

Physical Review Letters, 1987
Galaxy and structure formation in a neutrino-dominated universe with cosmic strings is investigated. Strings survive neutrino-free streaming to seed galaxies and clusters. The effective maximum Jeans mass is about 1.5\ifmmode\times\else\texttimes\fi{}${10}^{14}$${n}_{50}^{\mathrm{\ensuremath{-}}4}$${M}_{\ensuremath{\bigodot}}$, lower than in the ...
, Brandenberger, , Kaiser, , Schramm, , Turok   +3 more
openaire   +2 more sources

SINGLET NEUTRINOS AS HOT DARK MATTER

Modern Physics Letters A, 1993
A model is presented that generates mass and magnetic moment matrices for singlet neutrinos radiatively at one-loop level. It allows the singlet neutrinos to account for the hot dark matter and the anomalous ionization of interstellar hydrogen.
openaire   +1 more source

The status of hot dark matter after SNO

Nuclear Physics B - Proceedings Supplements, 2002
Abstract While the combined SNO-SuperKamiokande solar results require only the three known active neutrinos, adding the atmospheric neutrino and LSND input would require a fourth, sterile neutrino, ν s . The LSND results, which alone force appreciable hot dark matter, are unlikely to be accommodated by a 3+1 neutrino scheme, so it is important to ...
D.O. Caldwell, R.N. Mohapatra, S.J. Yellin   +2 more
openaire   +1 more source

Hot and dark matter

2012
In this thesis, we build new Effective Field Theory tools to describe the propagation of energetic partons in hot and dense media, and we propose two new reactions for dark matter in the early universe. In the first part, we analyze the transverse momentum broadening in the absence of radiation of an energetic parton propagating through quark-gluon ...
openaire   +1 more source

Hot and Heavy Dark Matter from Supercooling

2023
We point out that dark matter which is produced non-adiabatically in a phase transition (PT) with fast bubble walls receives a boost in velocity which leads to long free-streaming lengths. We find that this could be observed via the suppressed matter power spectrum for dark matter masses around $10^8 - 10^9$ GeV and energy scales of the PT around $10 ...
Baldes, Iason, Gouttenoire, Yann, Sala, Filippo   +2 more
openaire   +1 more source

Neutrinoless Double Beta Decay — and Hot Dark Matter

2006
Nuclear double beta decay provides an extraordinarly broad potential to search for beyond-standard-model physics. The occurrence of the neutrinoless decay (0νββ) mode has fundamental consequences: first total lepton number is not conserved, and second, the neutrino is a Majorana particle.
openaire   +2 more sources

EXPERIMENTS ON WIMPS, SIMPS, AND HOT DARK MATTER

International Journal of Modern Physics D, 1994
The particle which constitutes more than 90% of the mass of the universe is not one of those in the Standard Model of particle physics. The search for this dark matter particle has now eliminated or severely restricted many candidates. While accelerator-produced results and indirect searches have helped, the most extensive exclusions have come from ...
openaire   +1 more source

Breakdown of Chiral Perturbation Theory for the Axion Hot Dark Matter Bound

Physical Review Letters, 2021
Luca Di Luzio, Guido Martinelli, Gioacchino Piazza   +2 more
exaly  

Nonthermal neutrino-like hot dark matter in light of the S8 tension

Physical Review D, 2022
Subinoy Das, Vivian Poulin, Ravi Sharma   +2 more
exaly  

Nonthermal hot dark matter from inflaton or moduli decay: Momentum distribution and relaxation of the cosmological mass bound

Physical Review D, 2021
Mayukhraj Gangopadhyay, Ratul Mahanta, Koushik Dutta   +2 more
exaly