Various pulsar timing array (PTA) experiments (NANOGrav, EPTA, PPTA, CPTA, including
data from InPTA) very recently reported evidence for excess red common-spectrum signals …

We revisit the possibility that the stochastic common-spectrum process recently detected by
the NANOGrav pulsar timing array experiment could be due to primordial gravitational …

The NANOGrav pulsar timing array experiment reported evidence for a stochastic common-
spectrum process affecting pulsar timing residuals in its 12.5-yr data set, which might be …

A constant early dark energy (EDE) component contributing a fraction f EDE (zc)∼ 10% of
the energy density of the universe around zc≃ 3500 and diluting as or faster than radiation …

Our current best guess for a unified theory of gravitation and quantum field theory (string
theory) generically predicts a set of requirements for a consistently quantized theory, the …

We discuss under which conditions multi-field cold and warm inflationary models with
canonical kinetic energy terms are compatible with the swampland conjectures about the …

The scenario of constant-roll inflation in the frame of the Randall-Sundraum II (RS II) brane
gravity model is considered. Based on the scenario, the smallness of the second slow-roll …

A bstract There have been many attempts to construct de Sitter space-times in string theory.
While arguably there have been some successes, this has proven challenging, leading to …

The trans-Planckian censorship conjecture implies that single-field models of inflation
require an extreme fine-tuning of the initial conditions due to the very low-scale of inflation …

A bstract We argue that, in the presence of time-dependent fluxes and quantum corrections,
four-dimensional de Sitter solutions should appear in the type IIB string landscape and not in …