4 papers
Wave-envelope dark matter beyond the monochromatic paradigm
Yechan Kim, Hye-Sung Lee
Ultralight dark matter searches widely assume that signals are monochromatic, with a single frequency set by the mass. This assumption is generally violated in the presence of fiel…
Oscillating scalar potential and its implications for cosmic neutrino background searches
Yechan Kim, Hye-Sung Lee
We propose a novel mechanism in which an external oscillatory wave modulates the mass-squared term of a scalar potential, periodically switching its sign. As a result of this "pote…
Dark gauge-mediated supersymmetry breaking with a massless dark photon
Brian Batell, Yechan Kim, Hye-Sung Lee +1
We study dark gauge-mediated supersymmetry breaking (dark GMSB) in a theory with a new unbroken local symmetry and massless dark photon. Messenger fields charged under b…
Refined approaches in second leptogenesis for the baryon-lepton asymmetry discrepancy
YeolLin ChoeJo, Kazuki Enomoto, Yechan Kim +1
The temperature-dependent mass of the heavy neutrino can lead to the second leptogenesis occurring below the electroweak scale, potentially explaining the large discrepancy between…