A number of challenges to the standard Λ CDM model have been emerging during the past
few years as the accuracy of cosmological observations improves. In this review we discuss …

Neutron stars and quark stars are ideal laboratories to study fundamental physics at supra
nuclear densities and strong gravitational fields. Astrophysical observables, however …

According to quantum mechanics, a harmonic oscillator can never be completely at rest.
Even in the ground state, its position will always have fluctuations, called the zero-point …

Around the globe several observatories are seeking the first direct detection of gravitational
waves (GWs). These waves are predicted by Einstein's general theory of relativity and are …

The role of the gravitational sector in the Lorentz-and CPT-violating standard-model
extension (SME) is studied. A framework is developed for addressing this topic in the context …

We report on the first long-term application of squeezed vacuum states of light to improve the
shot-noise-limited sensitivity of a gravitational-wave observatory. In particular, squeezed …

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 …

This review discusses the current status of supermassive black hole research, as seen from
a purely observational standpoint. Since the early '90s, rapid technological advances, most …

Signal extraction out of background noise is a common challenge in high-precision physics
experiments, where the measurement output is often a continuous data stream. To improve …

The full optimization of the design and operation of instruments whose functioning relies on
the interaction of radiation with matter is a super-human task, due to the large dimensionality …