A number of challenges to the standard Λ CDM model have been emerging during the past few years as the accuracy of cosmological observations improves. In this review we discuss …
The simplest ΛCDM model provides a good fit to a large span of cosmological data but harbors large areas of phenomenology and ignorance. With the improvement of the number …
We review numerous arguments for primordial black holes (PBHs) based on observational evidence from a variety of lensing, dynamical, accretion and gravitational-wave effects. This …
The Hubble tension has now grown to a level of significance which can no longer be ignored and calls for a solution which, despite a huge number of attempts, has so far eluded …
Over recent decades, cosmological simulations of galaxy formation have been instrumental in advancing our understanding of structure and galaxy formation in the Universe. These …
CMB-S4 Science Case, Reference Design, and Project Plan Page 1 CMB-S4 Science Case, Reference Design, and Project Plan CMB-S4 Collaboration July 9, 2019 arXiv:1907.04473v1 …
The dark energy plus cold dark matter (ΛCDM) cosmological model has been a demonstrably successful framework for predicting and explaining the large-scale structure of …
Axions comprise a broad class of particles that can play a major role in explaining the unknown aspects of cosmology. They are also well-motivated within high energy physics …
We review theories of dark matter (DM) beyond the collisionless paradigm, known as self- interacting dark matter (SIDM), and their observable implications for astrophysical structure …