DMWG Seminar
23 events
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Seminar
Weak lensing cosmology by Subaru HSC survey
December 12 (Thu) at 10:30 - 12:00, 2019
Dr. Chiaki Hikage (Project Associate Professor, Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo)
Place: IPMU seminar room C
Venue: Kavli IPMU Building
Event Official Language: English
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Seminar
Haloes at the low-mass end in wino dark matter
October 21 (Mon) at 13:00 - 15:00, 2019
Dr. Toyokazu Sekiguchi (Research Center for the Early Universe (RESCEU), The University of Tokyo)
Neutral wino is a natural candidate of dark matter in split-supersymmetry. Indirect detection is a promising probe of wino dark matter, with its annihilation enhanced non-perturvatively (i.e. Sommerfeld enhancement). In theoretical prediction, halo formation at the low-mass end is a key ingredient. For this purpose, we investigate kinetic decoupling of wino dark matter and consequent dark matter density perturbations. We show that inelastic processes involving charged wino, which are relevant for kinetic equilibrium at late times, shuts off abruptly. This results in boosted acoustic peaks in density power spectrum at horizon scales around the kinetic decoupling. Based on an analytic modeling of subhalo evolution, we estimate the subhalo mass function of (dwarf) galaxy-sized haloes and effects on the annihilation boost factor. We also discuss application of our analysis to SU(2)_L multiplet minimal dark matter.
Venue: Seminar Room #160
Event Official Language: English
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Seminar
A new lamppost in dark matter searches: Composite Dark Matter
October 1 (Tue) at 10:00 - 18:00, 2019
Dr. Enrico Rinaldi (Research Part-time Worker, iTHEMS)
In the search for the nature of dark matter many particle physics models are proposed. Models originating from a new strongly coupled dark sector, similar to QCD and Nuclear Physics, give rise to Composite Dark Matter particles. These models are hard to study, but they have a very interesting phenomenology with clear signals that are distinct from the usual WIMP candidates. To make robust predictions in Composite Dark Matter models one often needs to investigate non-perturbative effects due to the strong dynamics. In my talk I will explain how Lattice Field Theory methods and numerical simulations are well suited for this task and contribute to a solid uncertainty quantification. A variety of detection signals can be studied with lattice simulations, from dark matter self interactions to interactions with regular matter and even signals of dark phase transitions generating primordial gravitational waves.
Venue: #424-426, Main Research Building
Event Official Language: English
23 events