We explicitly construct a double-field inflationary model, which satisfies the latest Planck
constraints at the cosmic microwave background (CMB) scales and produces the whole dark …

Current and future B-mode polarization data are the most powerful observables to constrain
gravitational waves from the early Universe. We set conservative constraints on tensor …

The recently proposed swampland criteria aim to evade any (meta-) stable de Sitter
constructions within string landscapes, making it difficult to accommodate accelerating …

In this work, we present a quintessential interpretation of having a blue-tilted tensor power
spectrum for canonical single-field slow-roll inflation to explain the recently observed Pulsar …

The difficulty of building metastable vacua in string theory, has led some to conjecture that in
the string theory landscape, potentials satisfy|∇ V/V|≥ c∼ O (1). This condition, which is …

We discuss a mechanism of particle production during inflation that can result in a blue
gravitational wave (GW) spectrum, compatible with the BICEP2 result and with the r< 0.11 …

The recently proposed trans-Planckian censorship conjecture (TCC) seems to require that
the energy scale of inflation is significantly lower than the Planck scale (H inf< 10-20 M Pl) …

A bstract One class of single-field inflationary models compatible with the recently-
conjectured Swampland criteria would be those in which a Hubble slow-roll arameter ϵ H is …

It has been shown that both scalar and tensor modes with non-Bunch-Davies initial states
can enhance the amplitudes of the primordial bispectra compared to those with the Bunch …

We propose a novel mechanism for enhancing primordial gravitational waves without
significantly affecting the curvature perturbations produced during inflation. This is achieved …