Analogue gravity is a research programme which investigates analogues of general
relativistic gravitational fields within other physical systems, typically but not exclusively …

We present an updated review of Lorentz invariance tests in effective field theories (EFTs) in
the matter as well as in the gravity sector. After a general discussion of the role of Lorentz …

We review the status of bouncing cosmologies as alternatives to cosmological inflation for
providing a description of the very early universe, and a source for the cosmological …

We study a generally covariant model in which local Lorentz invariance is broken by a
dynamical unit timelike vector field ua—the “aether.” Such a model makes it possible to …

We perform a general study of primordial scalar non-Gaussianities in single-field inflationary
models in Einstein gravity. We consider models where the inflaton Lagrangian is an arbitrary …

In most current models of inflation based on a weakly self-coupled scalar matter field
minimally coupled to gravity, the period of inflation lasts so long that, at the beginning of the …

The problem of reconciling general relativity and quantum theory has fascinated and
bedeviled physicists for more than 70 years. Despite recent progress in string theory and …

All cosmological observations to date are consistent with adiabatic, Gaussian and nearly
scale invariant initial conditions. These findings provide strong evidence for a particular …

In this paper we consider the influence of trans-Planckian physics on the CMBR anisotropies
produced by inflation. We consider a simple toy model that allows for analytic calculations …

Whereas semiclassical gravity is based on the semiclassical Einstein equation with sources
given by the expectation value of the stress-energy tensor of quantum fields, stochastic semi …