Novel Rotating Hairy Black Hole in （2 ＋ 1） Dimensions

We present some novel rotating hairy black hole metric in （2 ＋ 1） dimensions, which is an exact solution to the field equations of the Einstein-scalar-AdS theory with a non-minimal coupling. The scalar potential is determined by the metric ansatz and consistency of the field equations and cannot be prescribed arbitrarily. In the simplified, critical ease, the scalar potential contains two independent constant parameters, which are respectively related to the mass and angular momentum of the black hole in a particular way. As long as the angular momentum does not vanish, the metric can have zero, one or two horizons. The case with no horizon is physically uninteresting because of the curvature singularity lying at the origin. We identify the necessary conditions for at least one horizon to be present in the solution, which imposes some bound on the mass-angular momentum ratio. For some particular choice of pararneters our solution degenerates into some previously known black hole solutions.     

Confronting the DAMPE excess with the scotogenic type-Ⅱ seesaw model

The DArk Matter Particle Explorer(DAMPE) has observed a tentative peak at E ~ 1.4 Te V in the cosmic-ray electron spectrum.In this paper,we interpret this excess in the scotogenic type-Ⅱ seesaw model.This model extends the canonical type-Ⅱ seesaw model with dark matter(DM) candidates and a loop-induced vacuum expectation value of the triplet scalars,v?,resulting in small neutrino masses naturally even for Te V scale triplet scalars.Assuming a nearby DM subhalo,the DAMPE excess can be explained by DM annihilating into a pair of triplet scalars which subsequently decay to charged lepton final states.Spectrum fitting of the DAMPE excess indicates it potentially favors the inverted neutrino mass hierarchy.We also discuss how to evade associated neutrino flux in our model.     

Probing light DM via the Migdal effect with spherical proportional counter

Owing to its low electronic noise and flexible target materials, the Spherical Proportional Counter(SPC)with a single electron detection threshold can be utilized to search for sub-GeV dark matter(DM). In this study, we investigate the prospects for light DM direct detection via the DM-nucleus Migdal effect in the DARKSPHERE detector. We consider different DM velocity distributions and momentum-transfer effects. For Xenon and Neon targets, we find that the DM mass mDM can be probed down to as lo...