In the Dynamical Dark Matter (DDM) framework, the dark sector comprises a large number of constituent particles whose individual masses, lifetimes, and cosmological abundances scale with respect to each other in specific ways. Thus far, DDM model-building has primarily relied on non-thermal mechanisms for abundance generation such as misalignment production, since these mechanisms give rise...
I will discuss the possibility of bremsstrahlung of a photon or dark sector particle being the leading order process for the direct detection of dark matter within the effective field theory framework. It will be shown under what circumstances a bremsstrahlung process could possibly alleviate momentum suppression or spin-dependence of the interactions.
Cannibals are dark matter particles with a scattering process that allows three particles to annihilate to two. This exothermic process keeps the gas of the remaining particles warm long after they become non-relativistic. A cannibalizing dark sector which is decoupled from the Standard Model naturally arises from a pure-glue confining hidden sector. It has an effective field theory...
We perform a combined likelihood analysis for IceCube 6-year High-Energy Starting Events (HESE) and 8-year throughgoing muon events using a two-component neutrino flux model. This can be motivated either from purely astrophysical sources or due to a beyond Standard Model contribution, such as decaying heavy dark matter. We find that the astrophysical plus dark matter interpretation is mildly...
The mechanism of “spontaneous leptogenesis” — in which the matter-antimatter asymmetry is generated via motion of a scalar field coupled to the electroweak gauge bosons — provides an interesting alternative to more traditional thermal leptogenesis models. While an axion-like field is a natural candidate for these models, the observed asymmetry requires an axion mass so large it decays shortly...
The properties of the dark matters, massive graviton and galaxy clusters are discussed in terms of the new three-dimensional quantized space model. Three new particles (bastons) with the electric charges (EC) are proposed as the dark matters [1]. And the rest mass of 1.4 TeV/c2 is assigned to the Le particle with the EC charge of -2e based on the data of DAMP (Dark Matter Particle Explorer)...