We update the constraints on the fraction of the Universe that may have gone into primordial
black holes (PBHs) over the mass range 10− 5 to 10 50 g. Those smaller than∼ 10 15 g …

We review several current aspects of dark matter theory and experiment. We overview the
present experimental status, which includes current bounds and recent claims and hints of a …

We update the constraints on the fraction of the Universe going into primordial black holes in
the mass range 10 9–10 17 g associated with the effects of their evaporations on big bang …

We study the effects of long-lived massive particles, which decayed during the big-bang
nucleosynthesis (BBN) epoch, on the primordial abundance of light elements. Compared to …

The study of cosmic phase transitions are of central interest in modern cosmology. In the
standard model of cosmology the Universe begins in a very hot state, right after at the end of …

We propose a new method toward distinguishing the Dirac versus Majorana nature of
neutrino masses from the spectrum of gravitational waves (GWs) associated with neutrino …

Increasingly stringent limits from LHC searches for new physics, coupled with lack of
convincing signals of weakly interacting massive particle (WIMP) in dark matter searches …

Big bang nucleosynthesis (BBN) describes the production of the lightest nuclides via a
dynamic interplay among the four fundamental forces during the first seconds of cosmic time …

The objectives of the DECi-hertz Interferometer Gravitational Wave Observatory (DECIGO)
are to open a new window of observation for gravitational wave astronomy and to obtain …

The cosmological constant problem is a failure of naturalness and suggests that a fine-
tuning mechanism is at work, which may also address the hierarchy problem. An example …