The observed pattern of fermion masses and mixing is an outstanding puzzle in particle
physics, generally known as the flavor problem. Over the years, guided by precision neutrino …

Cosmic inflation provides a window to the highest energy densities accessible in nature, far
beyond those achievable in any realistic terrestrial experiment. Theoretical insights into the …

We calculate the post-recombination contribution to the cosmic microwave background
(CMB) spectral distortion due to general exotic energy injections, including dark matter (DM) …

We study the landscape of lower-dimensional vacua of the standard model (SM) coupled to
gravity in the presence of the so-called “dark dimension” of size R⊥ in the micron range …

Axion strings are horizon-size topological defects that may be produced in the early
Universe. Ultralight axion-like particles may form strings that persist to temperatures below …

Spatial curvature is one of the most fundamental parameters in our current concordance flat
ΛCDM model of the Universe. The goal of this work is to investigate how the constraint on …

We discuss two-stage dilaton-axion inflation models [1] and describe α-attractor models with
either exponential or polynomial approach to the plateau. We implement one of the models …

After their generation, cosmological backgrounds of gravitational waves propagate nearly
freely but for the expansion of the Universe and the anisotropic stress of free-streaming …

We summarize progress made in theoretical astrophysics and cosmology over the past
decade and areas of interest for the coming decade. This Report is prepared as the TF09" …

The current understanding of dark matter comes largely from measurements of the total
matter content in the universe, from the distribution of gravitating matter on very large scales …