Tootfinder

A leading gravitational wave observatory recently detected ripples in spacetime that scientists say came from the collision of a dead, superdense stellar remnant and an unknown object.
LIGO-Virgo-KAGRA detected a unique gravitational wave signal in May 2023, just days after the observatory resumed operations following some upgrades that reduced the amount of noise in the detector.
The signal is dubbed GW230529 for short.
The gravitational wave signal travelled 650 million…

The Central Kinematics and Black Hole Mass of 4C 37.11: #BlackHole Pair Ever Found: https://noirlab.edu/public/news/noirlab2405/?lang - data from Gemini North provide possible explanation for supermassive binary black hole’s halted merger.

I’ve been trying very hard to come up with link beteeen the magnetic fields generated by the black hole at the center of our galaxy (that generate the beautiful pattern of polarized light shown here), and the magnetic fields generated by the human brain that I measure in my neuroscience research, but I’m at a loss. Except maybe that black holes and human heads are both approximately spherical. #magnetoencephalography #blackhole https://mastodon.social/@mcnees/112168007768055185

Orbital polarimetric tomography of a flare near the Sagittarius A* supermassive black hole: #BlackHole: https://www.caltech.edu/about/news/ai-and-physics-combine-to-reveal-the-3d-structure-of-a-flare-erupting-around-a-black-hole

This https://arxiv.org/abs/2402.18604 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Dynamics of holographic dark energy with apparent-horizon cutoff and non-minimal derivative coupling gravity in non-flat FLRW universe
Background cosmological dynamics for a universe with matter, a scalar field non-minimally derivative coupling to Einstein tensor under power-law potential and holographic vacuum energy is considered here. The holographic IR cutoff scale is apparent horizon which, for accelerating universe, forms a trapped null surface in the same spirit as blackhole's event horizon. For non-flat case, effective gravitational constant can not be expressed in the Friedmann equation. Therefore holographic vacuum d…

Good morning. Please blackhole all URLs owned by Monday on your router. Thank you.

I’ve been trying very hard to come up with link beteeen the magnetic fields generated by the black hole at the center of our galaxy (that generate the beautiful pattern of polarized light shown here), and the magnetic fields generated by the human brain that I measure in my neuroscience research, but I’m at a loss. Except maybe that black holes and human heads are both approximately spherical. #magnetoencephalography #blackhole https://mastodon.social/@mcnees/112168007768055185

The #accretion of a solar mass per day by a 17-billion solar mass #BlackHole: #quasar: https://www.eso.org/public/news/eso2402/

Static Blackhole with Cosmological Influence: Whittaker Solutions
Santanu Tripathy, K Rajesh Nayak
https://arxiv.org/abs/2404.16146 https://

Static Blackhole with Cosmological Influence: Whittaker Solutions
In this article, we investigate the impact of cosmological parameters on black holes using an exact solution to Einstein's equations that satisfies the Whittaker equation of state. We examine a spherically symmetric black hole in the background of a static Einstein Universe with a perfect fluid source with the cosmological constant. This solution is characterized by two independent parameters, namely the size of the universe~($R$) and the cosmological constant~(Lambda), representing the cosmolo…

The #accretion of a solar mass per day by a 17-billion solar mass #BlackHole: #quasar: https://www.eso.org/public/news/eso2402/

"Beads on a String" Star Formation Tied to one of the most Powerful #AGN Outbursts Observed in a Cool Core #GalaxyCluster: #BlackHole Fashions Stellar Beads on a String: https://chandra.si.edu/photo/2024/beads/ -> https://www.nasa.gov/image-article/stellar-beads-on-a-string/

A multi-wavelength study of the hard and soft states of MAXI J1820 070 during its 2018 outburst: #AstroSat's Full Capability Deciphers #BlackHole X-ray #Binary MAXI J1820 07: https://www.isro.gov.in/AstroSatFullCapabilityDeciphers.html

This https://arxiv.org/abs/2401.00890 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Behind-the-horizon excitations from a single 2d CFT
In this work, we consider the atypical non-equilibrium state found in [1708.06328] which holographically represents a behind-the-horizon excitation in a blackhole spacetime. The special feature of this state is that it looks like an equilibrium state when probed by a class of low-energy operators. First, we retrieve this property using the uniformization mapping in the limit of large central charge, in the process we are able to derive rather than presume approximate thermal physics. Furthermor…

Nice video about the #Gaia discovery of the 33 solar-mass #BlackHole, making use of the #GaiaSky space simulation software: https://www.youtube.com/watch?v=cU00B-6DeSQ

Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry: #BlackHole in our galaxy found: https://www.cosmos.esa.int/web/gaia/iow_20240416 and https://www.eso.org/public/news/eso2408/ and https://www.youtube.com/watch?v=cU00B-6DeSQ&ab_channel=ESAGaiaMission