@SXSProject

Simulating eXtreme Spacetimes: Black holes, neutron stars, and beyond.

black-holes.org/
Joined April 2013
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New movies of #GravitationalWaves for the #LIGO detection at black-holes.org/gw150914!
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And now you can read all about it in Caltech's press release! caltech.edu/about/news/catal…

Catalog of Simulations of Black Hole Collisions Expands

A collaboration between physicists at Caltech and other institutions has released an expanded and refined catalog of simulations of black hole mergers.

caltech.edu
SXS Project@SXSProject6 Oct 2025
🎉 Happy paper publication day! 🎉 Our third catalog of binary black hole simulations, now published in Classical and Quantum Gravity. And it's open access! Scheel et al. 2025 Class. Quantum Grav. 42 195017 iopscience.iop.org/article/1… Also on the @arxiv at arxiv.org/abs/2505.13378

The SXS collaboration’s third catalog of binary black hole simulations

The SXS collaboration’s third catalog of binary black hole simulations, Scheel, Mark A, Boyle, Michael, Mitman, Keefe, Deppe, Nils, Stein, Leo C, Armaza, Cristóbal, Bonilla, Marceline S, Buchman,...

iopscience.iop.org
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🎉 Happy paper publication day! 🎉 Our third catalog of binary black hole simulations, now published in Classical and Quantum Gravity. And it's open access! Scheel et al. 2025 Class. Quantum Grav. 42 195017 iopscience.iop.org/article/1… Also on the @arxiv at arxiv.org/abs/2505.13378

The SXS collaboration’s third catalog of binary black hole simulations

The SXS collaboration’s third catalog of binary black hole simulations, Scheel, Mark A, Boyle, Michael, Mitman, Keefe, Deppe, Nils, Stein, Leo C, Armaza, Cristóbal, Bonilla, Marceline S, Buchman,...

iopscience.iop.org
SXS Project@SXSProject20 May 2025
We are excited to release a major update to our catalog of binary black hole simulations, available at arxiv.org/abs/2505.13378! Such simulations are key to LIGO/Virgo/KAGRA being able to extract science from their gravitational wave detections. 1/14
Figure 1 from our new catalog paper. We accurately capture precession, memory, eccentricity, and high mass ratio systems. For full details, see the paper.

ALT Figure 1 from our new catalog paper. We accurately capture precession, memory, eccentricity, and high mass ratio systems. For full details, see the paper.

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Just published in @PhysRevLett! Check out this article by SXS researchers Boyeneni, Wu and Most (@Caltech) on interpreting colliding black holes similar to the attraction of two electric charges
Physical Review Letters@PhysRevLett2 Sep 2025
Gravitational field equations describing binary black holes can be recast in a form resembling coupled Maxwell’s equations for electrodynamics go.aps.org/4g0K9g6
Fig 1: Rapidly spinning Kerr black hole in a dynamically evolved moving puncture gauge. Shown in color are the gravitational energy density and toroidal magnetic field in the meridional plane. Streamlines indicate the static component of the gravitational electric field and magnetic fields. The black ellipse marks the black hole horizon; white dashed contours denote the ergosphere.

ALT Fig 1: Rapidly spinning Kerr black hole in a dynamically evolved moving puncture gauge. Shown in color are the gravitational energy density and toroidal magnetic field in the meridional plane. Streamlines indicate the static component of the gravitational electric field and magnetic fields. The black ellipse marks the black hole horizon; white dashed contours denote the ergosphere.

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Cranking up the temperature! SXS researchers Hai-Yang Wang, Elias Most and Philip Hopkins (@Caltech) show how hot flows around supermassive black hole binaries with strong magnetic fields alter their feeding behavior. Full results at arxiv.org/abs/2508.16855
Volume rendering of a circumbinary magnetically arrested accretion disk simulation in a non-erupting state, when the cooling is treated with an adiabatic prescription.

ALT Volume rendering of a circumbinary magnetically arrested accretion disk simulation in a non-erupting state, when the cooling is treated with an adiabatic prescription.

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Earthquakes on neutron stars?! SXS researchers Louis Burnaz and Elias Most (@Caltech) and Ashley Bransgrove (@Princeton) simulate how these could be detected in signals from very active radio burst transients. Read their results at arxiv.org/abs/2508.18033
Fluctuations in the toroidal component of the magnetic field (top) and electric field (bottom) in the simulated magnetar quake event.

ALT Fluctuations in the toroidal component of the magnetic field (top) and electric field (bottom) in the simulated magnetar quake event.

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SXS Project retweeted
LIGO@LIGO26 Aug 2025
Replying to @LIGO @ego_virgo @LIGOLA @LIGOWA @KAGRA_PR
A spacetime waltz. Simulations consistent with our 86 most confident new detections, each showing the orbiting components and their emitted gravitational waves youtube.com/watch?v=3B6WKSWD… 🎬I Markin/T Dietrich/H Pfeiffer/SXS Collaboration #GWTC4 #O4IsHere

Visualization of the GWTC-4.0 events

The visualization shows binary black hole merger simulations with p...

youtube.com
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Take a look at the biggest black hole merger ever detected!😲🌌‼️ ~10 billion light years from Earth the Laser Interferometer Gravitational-wave Observatory(#LIGO) detected gravitational waves from the merge of 2 massive black holes Credit: SXS Project(black-holes.org)
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Check out this article about star quakes and monster shocks — research done by SXS collaboration members Yoonsoo Kim and Elias Most, both at @Caltech
Caltech@Caltech3 Jun 2025
To better understand the extreme physics underlying such a grizzly demise, researchers at Caltech are using supercomputers to simulate black hole–neutron star collisions. caltech.edu/about/news/star-…

Star Quakes and Monster Shock Waves

Caltech researchers simulate a black hole consuming a neutron star.

caltech.edu
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In particular, as highlighted through Fig. 9 of the paper, while our BBH simulations are generally accurate and long enough (to span the full frequency band) for the LIGO/Virgo/KAGRA detectors, this is not necessarily the case for future detectors. 2/n
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We are excited to release a major update to our catalog of binary black hole simulations, available at arxiv.org/abs/2505.13378! Such simulations are key to LIGO/Virgo/KAGRA being able to extract science from their gravitational wave detections. 1/14
Figure 1 from our new catalog paper. We accurately capture precession, memory, eccentricity, and high mass ratio systems. For full details, see the paper.

ALT Figure 1 from our new catalog paper. We accurately capture precession, memory, eccentricity, and high mass ratio systems. For full details, see the paper.

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We make it publicly available so everyone has high-quality binary black hole simulation data at their fingertips for their research! Of course, we’re not done yet— 13/14
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There’s a lot more work to do: higher mass ratios, higher eccentricity, and meeting the accuracy requirements of next-generation detectors. Stay tuned for the next version of our catalog! But for now, check out the latest catalog paper at arxiv.org/abs/2505.13378. 14/14

The SXS Collaboration's third catalog of binary black hole simulations

We present a major update to the Simulating eXtreme Spacetimes (SXS) Collaboration's catalog of binary black hole simulations. Using highly efficient spectral methods implemented in the Spectral...

arxiv.org
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