Conveners
Parallel: Dark Matter 5
- Gaurav Tomar (Chungnam National University, South Korea)
A long-range force between dark matter particles makes significant impacts on dark phenomenology.
It enhances the annihilation cross section at the late Universe (Sommerfeld enhancement), which affects the prospects for detecting annihilation products (indirect detection experiments).
It also leads to a large self-scattering cross section, which forms a significant core in dark matter...
To analyze WIMP of spin one half with a standard Maxwellian velocity distribution we calculate the maximal variation of the exclusion plot from the null results of 9 direct detection experiments. And the exclusion plot for each Wilson coefficient of the most general Galilean invariant WIMP nucleon effective Hamiltonian generalizes to a band delimited by the most constraining bound which...
I will discuss the halo-independent bounds on the WIMP-nucleon couplings of the non-relativistic effective Hamiltonian that drives the scattering process off nuclei of a WIMP of spin 1/2. For most of the couplings the degree of relaxation of the halo-independent bounds compared to those obtained with the Standard Halo Model is relatively moderate in the low and high WIMP mass regimes while in...
Albeit typically considered to be "dark", a dark matter particle can interact electromagnetically with ordinary matter via higher multipole moments generated at the quantum level. If dark matter particles are of Dirac nature, only a millicharge, an electric- and magnetic dipole and an anapole moment can exist. If however it is a Majorana fermion---as naturally predicted by some BSM theories...
Majorons are (pseudo-)Nambu-Goldstone bosons associated with lepton number symmetry breaking due to the Majorana mass term of neutrinos introduced in the seesaw mechanism. They are good dark matter candidates since their lifetime is suppressed by the lepton number breaking scale. We update constraints and discuss future prospects on majoron dark matter in the singlet majoron models based on...
We consider the positivity bounds for WIMP scalar dark matter with effective Higgs-portal couplings up to dimension-8 operators. Taking the superposed states for Standard Model Higgs and scalar dark matter, we show the part of the parameter space for the effective couplings, otherwise unconstrained by phenomenological bounds, is ruled out by the positivity bounds on the dimension-8 derivative...
