Light sterile neutrinos with a mass of∼ 1 eV continue to be interesting due to multiple hints
from terrestrial experiments. This simple hypothesis suffers from strong astrophysical …

Cosmic domain walls are harmless, provided that their tension decreases with expansion of
the Universe. This setup can be realized, if the scale of spontaneous symmetry breaking is …

Atom gradiometers have emerged as compelling broadband probes of scalar ultralight dark
matter (ULDM) candidates that oscillate with frequencies between approximately 10-2 Hz …

The symmetry can be broken at high temperature and then restored at low temperature,
which is the so-called\emph {high temperature symmetry breaking}. It often appears in some …

Although axionlike particles (ALPs) are popular dark matter candidates, their mass
generation mechanisms as well as cosmic thermal evolutions are unclear. In this paper, we …

Ultralight dark matter (ULDM) is one of the most promising DM candidates. Because of the
Bose enhancement, we find the annihilation rate of ULDM in the presence of background …

Why does dark matter (DM) live longer than the age of the Universe? Here we study a novel
sub-eV scalar DM candidate whose stability is due to the Pauli exclusion of its fermionic …

A bstract The portal connecting the invisible and visible sectors is one of the most natural
explanations of the dark world. However, the early-time dark matter production via the portal …

A bstract Axions provide a solution to the strong CP problem and are excellent dark matter
candidates. The presence of additional sources of CP violation, for example to account for …

The spontaneous breaking of the global lepton number, an accidental symmetry in the
Standard Model of particle physics, results in a massless goldstone boson, the Majoron …