Results 71 to 80 of about 88,834 (168)

Semianalytic model for decaying dark matter halos [PDF]

Physical Review D
Decaying dark matter (DDM) affects the evolution of cosmic structure relative to standard cold, collisionless, stable dark matter (CDM). We introduce a new semianalytic model for the effects of two-body DDM on halo structure and subhalo populations. In this scenario, cold parent dark matter particles decay into less massive daughter particles plus dark
Ethan O. Nadler, Andrew J. Benson
openaire   +2 more sources

Low-energy radiative backgrounds in CCD-based dark-matter detectors

Journal of High Energy Physics
The reach of sub-GeV dark-matter detectors is at present severely affected by low-energy events from various origins. We present the theoretical methods to compute the single- and few-electron events that arise from secondary radiation emitted by high ...
Peizhi Du, Daniel Egaña-Ugrinovic, Rouven Essig, Mukul Sholapurkar   +3 more
doaj   +1 more source

Unitarization of the Sommerfeld enhancement through the renormalization group

Journal of High Energy Physics
When a pair of dark matter particles interacts via a long-range force mediated by a light particle, their nonrelativistic annihilation cross section can be significantly enhanced — a phenomenon known as the Sommerfeld enhancement.
Yuki Watanabe
doaj   +1 more source

Probing invisible dark photon models via atmospheric collisions

Journal of High Energy Physics
Atmospheric collisions can copiously produce dark sector particles in the invisible dark photon model, leading to detectable signals in underground neutrino detectors.
Mingxuan Du, Rundong Fang, Zuowei Liu, Wenxi Lu, Zicheng Ye   +4 more
doaj   +1 more source

Conformal freeze-in from neutrino portal

Journal of High Energy Physics
We study a scenario where a dark sector, described by a Conformal Field Theory (CFT), interacts with the Standard Model through the neutrino portal. In this setup, conformal invariance breaks below the electroweak scale, causing the theory to transition ...
Sungwoo Hong, Maxim Perelstein, Taewook Youn   +2 more
doaj   +1 more source

A Model For Dark Matter Halos

, 2017
A dark matter halo model is developed postulating a new state of matter, entities which have internal spin-like terms. Their motion in an external Schwarzschild metric is discussed. The internal spin motion contributes to the centrifugal force along with the usual orbital angular momentum term and can severely limit the distance of closest approach to ...
openaire   +2 more sources

Higgs-portal spin-1 dark matter with parity-violating interaction

Journal of High Energy Physics
We introduce the spin-1 U(1) X gauged field X with Z 2 odd dark parity to evade the current strong constraints on kinetic mixing. Then, X becomes stable and a candidate for the dark matter. The lowest mass dimension of interaction is six, and the type is
Kimiko Yamashita
doaj   +1 more source

Illuminating scalar dark matter co-scattering in EFT with monophoton signatures

Journal of High Energy Physics
We investigate the co-scattering mechanism for dark matter production in an EFT framework which contains new Z 2-odd singlets, namely two fermions N 1,2 and a real scalar χ. The singlet scalar χ is the dark matter candidate.
Geneviève Bélanger, Manimala Mitra, Rojalin Padhan, Abhishek Roy   +3 more
doaj   +1 more source

Measurement of Milli-Charged particles with a moderately large cross section from the Earth’s core at IceCube

Journal of High Energy Physics
It is assumed that heavy dark matter ϕ with O(TeV) mass captured by the Earth may decay to relativistic light milli-charged particles (MCPs). These MCPs could be measured by the IceCube neutrino telescope.
Ye Xu
doaj   +1 more source

A New Dark Matter Model for Galaxies

, 2000
In this paper a new theory of Dark Matter is proposed. Experimental analysis of several Galaxies show how the non-gravitational contribution to galactic Velocity Rotation Curves can be interpreted as that due to the Cosmological Constant $ $. The experimentally determined values for $ $ are found to be consistent with those expected from Cosmological
Kraniotis, G. V., Whitehouse, S. B.
openaire   +2 more sources