I review the current status of phenomenological programs inspired by quantum-spacetime
research. I stress in particular the significance of results establishing that certain data …

We discuss effects of loss of coherence in low energy quantum systems caused by or related
to gravitation, referred to as gravitational decoherence. These effects, resulting from random …

We outline the experimental concept and key scientific capabilities of AION (Atom
Interferometer Observatory and Network), a proposed experimental programme using cold …

A fundamental property of the Standard Model is that the Higgs potential becomes unstable
at large values of the Higgs field. For the current central values of the Higgs and top masses …

Abstract Changes of surface gravity on Earth are of great interest in geodesy, earth sciences
and natural resource exploration. They are indicative of Earth system's mass redistributions …

It has recently been suggested that the presence of a plenitude of light axions, an Axiverse,
is evidence for the extra dimensions of string theory. We discuss the observational …

We propose new signals for the direct detection of ultralight dark matter such as the axion.
Axion or axionlike particle dark matter may be thought of as a background, classical field …

The mass of the dark matter particle is unknown, and may be as low as∼ 1 0-22 eV. The
lighter part of this range, below∼ eV, is relatively unexplored both theoretically and …

We present the MIGA experiment, an underground long baseline atom interferometer to
study gravity at large scale. The hybrid atom-laser antenna will use several atom …

Laser frequency noise is a dominant noise background for the detection of gravitational
waves using long-baseline optical interferometry. Amelioration of this noise requires near …