The superposition principle is the cornerstone of quantum mechanics, leading to a variety of
genuinely quantum effects. Whether the principle applies also to macroscopic systems or …

The search for a consistent and empirically established quantum theory of gravity is among
the biggest open problems of fundamental physics. The obstacles are of formal and of …

The amplitude of primordial curvature perturbations is enhanced when a radiation bath at a
temperature T> H is sustained during inflation by dissipative particle production, which is …

The inflationary paradigm provides a mechanism to generate the primordial perturbations
needed to explain the observed large-scale structures in the Universe. Inflation traces back …

This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom
Interferometry Workshop hosted by CERN. The workshop brought together experts from …

A generalization of the random fluid hydrodynamic fluctuation theory due to Landau and
Lifshitz is applied to describe cosmological fluctuations in systems with radiation and scalar …

The inflationary account for the emergence of the seeds of cosmic structure falls short of
actually explaining the generation of primordial anisotropies and inhomogeneities. This …

We display a number of advantages of objective collapse theories for the resolution of long-
standing problems in cosmology and quantum gravity. In particular, we examine …

Inflation solves several cosmological problems at the classical and quantum level, with a
strong agreement between the theoretical predictions of well-motivated inflationary models …

The usual account for the origin of cosmic structure during inflation is not fully satisfactory, as
it lacks a physical mechanism capable of generating the inhomogeneity and anisotropy of …