Detection of a gravitational-wave signal of non-astrophysical origin would be a landmark
discovery, potentially providing a significant clue to some of our most basic, big-picture …

This study introduces novel constraints on the free streaming of thermal relic warm dark
matter (WDM) from Lyman-α forest flux power spectra. Our analysis utilizes a high resolution …

Searches for dark matter decaying into photons constrain its lifetime to be many orders of
magnitude larger than the age of the Universe. A corollary statement is that the abundance …

Direct detection of gravitational waves has become a powerful new tool of multi-messenger
astrophysics. Apart from short-duration (transient) events, such as the inspirals and mergers …

This report, as part of the 2021 Snowmass Process, summarizes the current status of collider
physics at the Energy Frontier, the broad and exciting future prospects identified for the …

Dark matter (DM) from the galactic halo can accumulate in neutron stars and transmute them
into sub-2.5 M⊙ black holes if the dark matter particles are heavy, stable, and have …

Fuzzy dark matter (FDM) is a well-motivated candidate for dark matter (DM) as its tiny mass
and large de-Broglie wavelength suppress small-scale matter fluctuations, thereby solving …

We present a novel mechanism for gravitational wave generation in the early Universe. Light
spectator scalar fields during inflation can acquire a blue-tilted power spectrum due to …

New particles in theories beyond the standard model can manifest as stable relics that
interact strongly with visible matter and make up a small fraction of the total dark matter …

We investigate the structure of admixed neutron stars with a regular hadronic component
and a fraction of fermionic self-interacting dark matter. Using two limiting equations of state …