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 …

Quantum theory has been successfully validated in numerous laboratory experiments. But
would such a theory, which effectively describes the behavior of microscopic physical …

Gravitational waves (GWs) have a great potential to probe cosmology. We review early
universe sources that can lead to cosmological backgrounds of GWs. We begin by …

The 100 years since the publication of Albert Einstein's theory of general relativity saw
significant development of the understanding of the theory, the identification of potential …

Gravitational wave (GW) detection in space probes the GW spectrum that is inaccessible
from the Earth. In addition to the LISA project led by the European Space Agency, and the …

The space-based Laser Interferometer Space Antenna (LISA) will be able to observe the
gravitational-wave signals from systems comprised of a massive black hole and a stellar …

Following the selection of The Gravitational Universe by ESA, and the successful flight of
LISA Pathfinder, the LISA Consortium now proposes a 4 year mission in response to ESA's …

Cosmological gravitational particle production (CGPP) is the creation of particles in an
expanding universe due solely to their gravitational interaction. These particles can play an …

According to the weak equivalence principle, all bodies should fall at the same rate in a
gravitational field. The MICROSCOPE satellite, launched in April 2016, aims to test its …

We present results from large-scale numerical simulations of a first order thermal phase
transition in the early Universe, in order to explore the shape of the acoustic gravitational …