Calculations show millicharged particles from supernovae can produce over 10 electron-recoil events per year in major detectors for millicharge 10^{-9} and sub-MeV to MeV masses, improving SN cooling bounds by up to an order of magnitude.
Hidden fermion as milli-charged dark matter in Stueckelberg Z' model
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abstract
We augment the hidden Stueckelberg $Z'$ model by a pair of Dirac fermions in the hidden sector, in which the $Z'$ has a coupling strength comparable to weak scale coupling. We show that this hidden fermion-antifermion pair could be a milli-charged dark matter candidate with a viable relic density. Existing terrestrial and astrophysical searches on milli-charged particles do not place severe constraints on this hidden fermion. We calculate the flux of monochromatic photons coming from the Galactic center due to pair annihilation of these milli-charged particles and show that it is within reach of the next generation $\gamma$-ray experiments. The characteristic signature of this theoretical endeavor is that the Stueckelberg $Z'$ boson has a large invisible width decaying into the hidden fermion-antifermion pair. We show that existing Drell-Yan data do not constrain this model yet. Various channels of singly production of this $Z'$ boson at the LHC and ILC are explored.
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Asymmetric reheating in Dark QED produces dark matter via a new channel where DM particles annihilate while still being created by inflaton decay, with the hidden-to-visible temperature ratio tied to the square root of the Yukawa coupling ratio.
Density-of-states lattice study of the first-order phase transition in Sp(4) Yang-Mills theory at finite temperature, confirming metastability and surface tension for two temporal extents toward the continuum limit.
In a B-L conserving SM extension with U(1)_x dark sector, CP-violating Yukawas generate opposite lepton asymmetries in visible and hidden sectors that sphalerons convert to baryon asymmetry, with gauge-independent bubble nucleation yielding stochastic GW spectra valid in supercooled regimes and a参数s
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Finite-temperature Yang-Mills theories with the density of states method: towards the continuum limit
Density-of-states lattice study of the first-order phase transition in Sp(4) Yang-Mills theory at finite temperature, confirming metastability and surface tension for two temporal extents toward the continuum limit.
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Gauge-independent Gravitational Waves from Cogenesis in a $B-L$ Conserving Universe
In a B-L conserving SM extension with U(1)_x dark sector, CP-violating Yukawas generate opposite lepton asymmetries in visible and hidden sectors that sphalerons convert to baryon asymmetry, with gauge-independent bubble nucleation yielding stochastic GW spectra valid in supercooled regimes and a参数s