8-10 May 2017
Discovery Building
US/Central timezone

Boosted Dark Matter and its implications for the features in IceCube HESE data

8 May 2017, 14:48
Orchard View (Discovery Bldg)

Orchard View

Discovery Bldg

Dark Matter - Convenor: Carsten Rott, SKKU Dark Matter


Prof. Rajesh Gandhi (HRI)


We study the implications of the premise that any new, relativistic, highly energetic neutral particle that interacts with quarks and gluons would create cascade-like events in the IceCube (IC) detector which would be observationally indistinguishable from neutral current deep-inelastic (DIS) scattering events due to neutrinos. Consequently, one reason for deviations, breaks or excesses in the expected astrophysical power-law neutrino spectrum could be the flux of such a particle. Motivated by features in the recent 1347-day IceCube high energy starting event (HESE) data, we focus on particular boosted dark matter ($\chi$) related realizations of this premise, where $\chi$ is assumed to be much lighter than, and the result of, the slow decay of a massive scalar ($\phi$) which constitutes a major fraction of the Universe's dark matter (DM). We show that this hypothesis, coupled with a standard power-law astrophysical neutrino flux is capable of providing very good fits to the present data, along with a possible explanation of other features in the HESE sample: i.e., a) the paucity of events beyond $\sim 2$ PeV b) a spectral feature resembling a dip in the 400 TeV--1 PeV region and c) an excess in the $50-100$ TeV region. (based on 1612.02834, "Boosted Dark Matter and its implications for the features in IceCube HESE data")

Primary author

Prof. Rajesh Gandhi (HRI)

Presentation Materials