Conveners
Parallel talks 4: Astro-particle Physics & Cosmology
- Chuan Yue (Purple Mountain Observatory)
Many well motivated dark matter (DM) particle candidates can decay into detectable X-ray photons. We analyze eROSITA Final Equatorial Depth Survey (eFEDS) from eROSITA early data release to search for unexplained X-ray lines that could indicate DM signal. Having discovered no extra line, we set limits on DM decay rate in mass range between 2-18 keV, and constrain the parameter space of two DM...
The forbidden dark matter cannot annihilate into a pair of heavier partners, either SM particles
or its partners in the dark sector, at the late stage of cosmological evolution by definition. We point
out the possibility of reactivating the forbidden annihilation channel around supermassive black
holes. Being attracted towards a black hole, the forbidden dark matter is significantly...
Supersymmetric extensions of the standard model with a stable neutral lightest supersymmetric particle (LSP) provide a natural candidate for the dark matter of the Universe. Here we consider scenarios in which the LSP is a superWIMP, i.e., an extremely weakly interacting particle (e.g., a gravitino or axino), produced via the decay of a neutralino NLSP.
These scenarios can be probed at...
Gamma-ray bursts (GRBs) are proposed as origins of ultra-high-energy cosmic rays (UHECRs) since 1995. The non-detection of high-energy neutrinos from the observed GRBs by the IceCube observatory constrain the contriubtion of GRBs to cosmic rays. Lately, GRB 221009A was detected as the B.O.A.T. (“brightest of all time”) GRB with photons of energy up to $\sim$ 18 TeV. We compare timescales of...
