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Black holes, gravitational waves, astrophysics, and cosmology. Doomsday Clock. Existential risk.

University of Chicago
Joined January 2010
Photo by daniel holz (@decohere)Photo by daniel holz (@decohere)Photo by daniel holz (@decohere)Photo by daniel holz (@decohere)Photo by daniel holz (@decohere)Photo by daniel holz (@decohere)
Featured article out today in the New Yorker about a class on existential risks taught at UChicago by the inimitable Daniel Holz (@decohere) and myself this spring: newyorker.com/
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Achievement unlocked: Finding a typo in one of Bob Wald's equations
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The #DoomsdayClock is now at #90SecondsToMidnight. Existential threats, like the possibility of nuclear war, put us all at risk. How do you want to see the world #TurnBackTheClock?
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ICYMI: @PaulmRand and Prof. @Decohere discussed the breakthrough discoveries featured in The Day Tomorrow Began with #ChicagoTonight's @BrandisFriedman. Watch the full @WTTW interview here: ms.spr.ly/6010ePLAM
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Explore the history of #BlackHole research with cosmologist Daniel Holz (@decohere), @NobelPrize-winning scholar and @UChicagoLab grad Andrea Ghez and renowned #UChicago theoretical physicist Robert Wald. Spotify: open.spotify.com/episode/2xq… Apple Podcasts: podcasts.apple.com/us/podcas…
Replying to @UChicago
New @BigBrainsUC podcast: The biggest moments in scientific history often happen in the unlikeliest of places. Learn about how UChicago scholar Subrahmanyan Chandrasekhar's pioneering research paved the way to the discovery of #BlackHoles. news.uchicago.edu/legendary-…
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How can pairs of colliding black holes measure #UniverseExpansion? Prof. Daniel Holz @UChicagoAstro and Jose María Ezquiaga of KICP and @NASA #EinsteinFellow, propose a 'spectral siren' method. ow.ly/v53y50Kn7NN
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✋🏼 Galactic high five! In Webb’s image of Stephan’s Quintet, we see 5 galaxies, 4 of which interact. (The left galaxy is in the foreground!) Webb will revolutionize our knowledge of star formation & gas interactions in these galaxies: nasa.gov/webbfirstimages/ #UnfoldTheUniverse
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👀 Sneak a peek at the deepest & sharpest infrared image of the early universe ever taken — all in a day’s work for the Webb telescope. (Literally, capturing it took less than a day!) This is Webb’s first image released as we begin to #UnfoldTheUniverse: nasa.gov/webbfirstimages/
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We are delighted to welcome @DavidRelman to the Bulletin's Science and Security Board! Relman is the Thomas C. and Joan M. Merigan Professor in Medicine, Professor of Microbiology & Immunology, and Senior Fellow at @StanfordCISAC. ow.ly/uAoV50IA6aB
"#Putin is playing with fire, and—even if he does not actually plan to use #nuclear weapons—we may all get burned," writes Bulletin Science and Security co-chair @decohere. ow.ly/W7Ez50ImLVU
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daniel holz retweeted
We remain at 100 seconds to midnight, according to the #DoomsdayClock. The good news - because humans created these threats, we can reduce them. Read more via @nypost: bit.ly/34ptCl8 #Scientists
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And it's finally out! Very excited for our review "Unveiling the Universe with Emerging Cosmological Probes" arxiv.org/abs/2201.07241 to be out! You can find here the details of 12 of the new emerging cosmological probes. 1/7
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daniel holz retweeted
Our new @LIGO @ego_virgo @KAGRA_PR catalog #GWTC3 adds even more #BlackHoles and #NeutronStar #BlackHoles mergers - as captured by our new "Stellar Graveyard" plot, courtesy of Aaron Geller @NorthWesternU. Check it out at ligo.org/detections/O3bcatal…
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daniel holz retweeted
The #GravitationalWaves distance measured to #GW170817 combined with the #redshift of #NGC4993 allowed our first ever measurement of the cosmic expansion rate using #GravitationalWaves #sirens. Soon we hope to use #sirens to help resolve the #HubbleTension ligo.org/science/Publication…
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daniel holz retweeted
At this moment exactly 4 years ago today, 12:41:04 UTC Aug 17th 2017, @LIGO and @ego_virgo detected #GW170817: the merger of 2 #NeutronStars about 130 million light years away and the first ever cosmic event observed in both #GravityAndLight. youtube.com/watch?v=EtIkOjq0…
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daniel holz retweeted
Today @LIGO and @ego_virgo released the bulk data from #O3a, the first half of our 3rd observing run, including all data taken between 1 April and 30 September 2019. Check it out at gw-openscience.org/O3/O3a/. Happy #GravitationalWaves hunting! #OpenData
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It remains 100 seconds to midnight. #DoomsdayClock amp.cnn.com/cnn/2021/01/27/o…
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“Today, the Bulletin of the Atomic Scientists leaves the Doomsday Clock unchanged. It is 100 seconds to midnight,” — @RachelBronson1, President & CEO, Bulletin of the Atomic Scientists #DoomsdayClock bit.ly/DoomsdayClock_2021
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