The exploration of the universe has recently entered a new era thanks to the multi-
messenger paradigm, characterized by a continuous increase in the quantity and quality of …

Abstract The Laser Interferometer Space Antenna (LISA) has two scientific objectives of
cosmological focus: to probe the expansion rate of the universe, and to understand …

Observations have found black holes spanning 10 orders of magnitude in mass across most
of cosmic history. The Kerr black hole solution is, however, provisional as its behavior at …

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 …

Abstract The Laser Interferometer Space Antenna (LISA) is the first scientific endeavour to
detect and study gravitational waves from space. LISA will survey the sky for Gravitational …

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 …

Abstract The Deci-hertz Interferometer Gravitational Wave Observatory (DECIGO) is a future
Japanese space mission with a frequency band of 0.1 Hz to 10 Hz. DECIGO aims at the …

A stochastic background of gravitational waves could be created by the superposition of a
large number of independent sources. The physical processes occurring at the earliest …

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 Laser Ranging Interferometer (LRI) instrument on the Gravity Recovery and Climate
Experiment (GRACE) Follow-On mission has provided the first laser interferometric range …