As you can imagine, I’m kind of obsessed with black hole binaries. So easy (let’s face it, a black hole is easy! Just mass and spin), but at the same time so terribly complicated… Happy to present our attempt to … Continue reading
November 15, 2018
Category Archives: CQG
November 14, 2018
Wide nutation: binary black-hole spins repeatedly oscillating from full alignment to full anti-alignment
Latest in the series of our spin-precession papers, here we found a thing that was worthy of a new name: wide nutation (we had wide precession before, but this is better). These are black-hole binary configurations where the angle between any … Continue reading
June 13, 2018
Black holes, gravitational waves and fundamental physics: a roadmap
This is a massive review born out of the European COST Action CA16104 Gravitational waves, black holes and fundamental physics (GWverse). We summarize the status of the field of gravitational-wave astronomy and lie down a roadmap for the immediate future. Leor … Continue reading
December 16, 2016
On the equal-mass limit of precessing black-hole binaries
Equal-mass binaries correspond to a discontinuous limit in the spin precession equations. A new constant of motion pops up, which can be exploited to study the dynamics. This is a really neat calculation done with Jakub, a Cambridge undergraduate student. Also, … Continue reading
February 22, 2016
Numerical simulations of stellar collapse in scalar-tensor theories of gravity
Here we present 1+1 numerical-relativity simulation of stellar collapse in scalar-tensor theories, where gravity is mediated by the usual metric coupled to an additional scalar field. Bottom line: you can test General Relativity with supernovae explosions! Davide Gerosa, Ulrich Sperhake, Christian D. … Continue reading
May 27, 2015
Tensor-multi-scalar theories: relativistic stars and 3+1 decomposition
What happens if you throw a scalar field into General Relativity? And if you throw more than one? Here is a paper on the phenomenology of neutron stars in theories with more than one scalar field coupled to gravity. Michael … Continue reading
January 28, 2015
Testing general relativity with present and future astrophysical observations.
A massive review on testing gravity, which came out of a nice meeting we had at University of Mississippi in January 2014. See the numbers. Emanuele Berti, et al. (53 authors incl. Davide Gerosa).Classical and Quantum Gravity 32 (2015) 24, 243001.arXiv:1501.07274 [gr-qc].