Davide Gerosa

Caltech


Optimizing LIGO with LISA forewarnings to improve black-hole spectroscopy

Rhondale Tso, Davide Gerosa, Yanbei Chen.
arXiv:1807.00075 [gr-qc].

LISA is going to be amazing: supermassive black-holes, galactic white dwarfs, EMRIs… Besides all of that, LISA can help us doing LIGO’s science better. Some LIGO’s sources (notably, things like GW150914) will show up in LISA years is advance. LISA is going to tell us when (in time) and where (in frequency) LIGO will see these sources. In this paper, we explore the idea of adapting the LIGO noise curve if one knows that a source is coming in (because LISA told us). We apply this idea to ringdown tests of GR, and show how powerful they become!

Other press coverage: astrobites.


Mining gravitational-wave catalogs to understand binary stellar evolution: a new hierarchical bayesian framework.

Stephen R. Taylor, Davide Gerosa.
Physical Review D 98 (2018) 083017.
arXiv:1806.08365 [astro-ph.HE].

Gravitational-wave astronomy is moving. Quickly. In a few years we are going to have large catalogs of many detections, and a whole lot of information to extract from them. Instead of focussing on parameters (masses, spins, redshifts) of single sources, we will want to extract hyperparameters describing physical features of the population (metallicity, natal kicks, common envelope, stellar winds, etc). Here we show how to do this in practice: read our new paper for an amazing journey through hyperlateral cubes, Gaussian process emulators, selection biases, hierarchical modeling and more.

Our tools are publicly available! Here is Steve’s Webpage and our public code.


Numerical Relativity beyond General Relativity

Happy to report about the great success of our workshop ”Numerical Relativity beyond General Relativity”. This was organized by me, Helvi Witek and Leo Stein at the Benasque physics center (Spain), in the beautiful region of the Pyrenees, on June 3-9, 2018. Was great to see world-leading experts from so many different fields (numerical relativity, gravitational-wave data analysis, self-force, theoretical physics, cosmology, etc) interacting and reporting their progress on innovative uses of computational techniques in gravitation. Here are the conference program and (some of) the talk’s slides.

I only wish the rain would have stopped for more than a few hours over the entire week. This is us with Einstein; we’re all beyond!

nulrelconf.jpg