Carl Haster
@haster.bsky.social
Assistant Professor at UNLV+NevadaCfA looking for gravitational waves and the best music. Previously at LIGO, MITKavli, CITA_ICAT and UoBIGWaves.
Reposted by Carl Haster
A little less than a year ago, a large team of cosmologists reported evidence that dark energy (which drives the acceleration of the expansion of the Universe) evolves over time. This made a huge splash but has also been viewed with healthy skepticism. Today they report that evidence has weakened. 🧪
The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration
We present improved cosmological constraints from a re-analysis of the Dark Energy Survey (DES) 5-year sample of Type Ia supernovae (DES-SN5YR). This re-analysis includes an improved photometric cross...
arxiv.org
November 12, 2025 at 12:00 PM
A little less than a year ago, a large team of cosmologists reported evidence that dark energy (which drives the acceleration of the expansion of the Universe) evolves over time. This made a huge splash but has also been viewed with healthy skepticism. Today they report that evidence has weakened. 🧪
Reposted by Carl Haster
Our next webinar will introduce our latest #GWTC4 release and the associated data (papers arxiv.org/abs/2508.18080 and arxiv.org/abs/2508.18079)
Tomorrow at 15:00 UTC, with the recording on YouTube after
Free registration wisconsin-edu.zoom.us/webinar/regi...
☄️🔭
Tomorrow at 15:00 UTC, with the recording on YouTube after
Free registration wisconsin-edu.zoom.us/webinar/regi...
☄️🔭
November 12, 2025 at 11:09 AM
Our next webinar will introduce our latest #GWTC4 release and the associated data (papers arxiv.org/abs/2508.18080 and arxiv.org/abs/2508.18079)
Tomorrow at 15:00 UTC, with the recording on YouTube after
Free registration wisconsin-edu.zoom.us/webinar/regi...
☄️🔭
Tomorrow at 15:00 UTC, with the recording on YouTube after
Free registration wisconsin-edu.zoom.us/webinar/regi...
☄️🔭
Reposted by Carl Haster
A universal mystery 🪐 Recently published research co-authored by UNLV astrophysicist Carl-Johan Haster gives insight into black holes and fundamental physics.
#UniversityResearch #Science #Physics #Astrophysics
www.unlv.edu/news/release...
#UniversityResearch #Science #Physics #Astrophysics
www.unlv.edu/news/release...
Study: Pair of Distinct Black Hole Mergers Reveals Clues on How They Form and Evolve
The mergers, measured one month apart in 2024 by LIGO-Virgo-KAGRA collaboration, advance scientific understanding of the nature of black hole formation and fundamental physics; offer evidence of "seco...
www.unlv.edu
November 7, 2025 at 3:26 PM
A universal mystery 🪐 Recently published research co-authored by UNLV astrophysicist Carl-Johan Haster gives insight into black holes and fundamental physics.
#UniversityResearch #Science #Physics #Astrophysics
www.unlv.edu/news/release...
#UniversityResearch #Science #Physics #Astrophysics
www.unlv.edu/news/release...
Reposted by Carl Haster
We’re closer to solving dark matter thanks to these black holes!
OzGrav PhD student at ANU, Aswathi, was part of the analysis team of the GW241011+GW241110 special event paper. Here she explains how these events helped refine our understanding of dark matter.
youtube.com/shorts/wW4yp...
OzGrav PhD student at ANU, Aswathi, was part of the analysis team of the GW241011+GW241110 special event paper. Here she explains how these events helped refine our understanding of dark matter.
youtube.com/shorts/wW4yp...
youtube.com
October 28, 2025 at 7:02 PM
We’re closer to solving dark matter thanks to these black holes!
OzGrav PhD student at ANU, Aswathi, was part of the analysis team of the GW241011+GW241110 special event paper. Here she explains how these events helped refine our understanding of dark matter.
youtube.com/shorts/wW4yp...
OzGrav PhD student at ANU, Aswathi, was part of the analysis team of the GW241011+GW241110 special event paper. Here she explains how these events helped refine our understanding of dark matter.
youtube.com/shorts/wW4yp...
A really nice article in AAS Nova about our article that was published today!
Meet GW241011 and GW241101: with rapid spins and mismatched black hole masses, these gravitational wave events provide strong evidence for black hole growth through successive mergers. aasnova.org/2025/10/28/n... 🔭🧪 @ligo.org
Not Their First Rodeo: Gravitational Wave Detectors Spot Merging Black Holes That Have Merged Before
The gravitational wave events GW241011 and GW241110 provide strong evidence for the growth of black holes through successive mergers.
aasnova.org
October 28, 2025 at 6:14 PM
A really nice article in AAS Nova about our article that was published today!
I'm incredibly happy to share the amazing results we in the @ligo.org, @egovirgo.bsky.social, KAGRA collaborations have made public today.
iopscience.iop.org/article/10.3...
We are today announcing the observation of two new Binary Black Holes, GW241011 and GW241110.
iopscience.iop.org/article/10.3...
We are today announcing the observation of two new Binary Black Holes, GW241011 and GW241110.
Radware Bot Manager Captcha
To ensure we keep this website safe, please can you confirm you are a human by ticking the box below.
iopscience.iop.org
October 28, 2025 at 4:06 PM
I'm incredibly happy to share the amazing results we in the @ligo.org, @egovirgo.bsky.social, KAGRA collaborations have made public today.
iopscience.iop.org/article/10.3...
We are today announcing the observation of two new Binary Black Holes, GW241011 and GW241110.
iopscience.iop.org/article/10.3...
We are today announcing the observation of two new Binary Black Holes, GW241011 and GW241110.
Reposted by Carl Haster
Two #blackhole mergers, GW241011 & GW241110, detected a month apart in 2024 are helping scientists learn how black holes form, spin & evolve. Researchers from OzGrav & ANU, incl. PhD student Aswathi P Subhash & CI Dr Ling (Lilli) Sun contributed key analysis.
www.ozgrav.org/news/twin-bl...
www.ozgrav.org/news/twin-bl...
Twin Black Hole Mergers Reveal Secrets of Cosmic Evolution - OzGrav
An international team of scientists from the LIGO, Virgo, and KAGRA collaborations, including researchers from the ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), has detected two ...
www.ozgrav.org
October 28, 2025 at 3:13 PM
Two #blackhole mergers, GW241011 & GW241110, detected a month apart in 2024 are helping scientists learn how black holes form, spin & evolve. Researchers from OzGrav & ANU, incl. PhD student Aswathi P Subhash & CI Dr Ling (Lilli) Sun contributed key analysis.
www.ozgrav.org/news/twin-bl...
www.ozgrav.org/news/twin-bl...
Reposted by Carl Haster
this is the people's ballroom
October 25, 2025 at 8:05 AM
this is the people's ballroom
Reposted by Carl Haster
How it feels citing your old papers:
(Me et al. 2024b) = "per my last email"
(Me et al. 2019) = "told you so!"
(Me et al. 2009) = "as the prophesy foretold"
(Me et al. 2024b) = "per my last email"
(Me et al. 2019) = "told you so!"
(Me et al. 2009) = "as the prophesy foretold"
October 20, 2025 at 2:31 PM
How it feels citing your old papers:
(Me et al. 2024b) = "per my last email"
(Me et al. 2019) = "told you so!"
(Me et al. 2009) = "as the prophesy foretold"
(Me et al. 2024b) = "per my last email"
(Me et al. 2019) = "told you so!"
(Me et al. 2009) = "as the prophesy foretold"
Reposted by Carl Haster
I think the technical name for this is Wolf-Rayet star
October 16, 2025 at 7:29 PM
I think the technical name for this is Wolf-Rayet star
Reposted by Carl Haster
Cosmologists! We have a faculty job going here in Oxford - happy to answer questions. Brief version is that this remains a great & collaborative place to do science and the students are superb. 🔭 www.jobs.ac.uk/job/DOP628/a...
Associate Professor of Cosmology at University of Oxford
Recruiting now: Associate Professor of Cosmology on jobs.ac.uk. Click for details and explore more academic job opportunities on the top job board
www.jobs.ac.uk
October 14, 2025 at 9:16 AM
Cosmologists! We have a faculty job going here in Oxford - happy to answer questions. Brief version is that this remains a great & collaborative place to do science and the students are superb. 🔭 www.jobs.ac.uk/job/DOP628/a...
Reposted by Carl Haster
Schweiziska tågbolaget SBB planerar i vår att inleda natttågstrafik mellan Malmö och Basel eller Zürich. Trafiken finansieras av en flygskatt - idén är ju att fler ska ta tåget. Tänk om den svenska regeringen haft liknande visioner. Men det är förstås för mycket begärt av Tidöpartierna.
Premiär för nattåg Sverige–Schweiz i vår – Järnvägar.nu
Det federala schweiziska tågtrafikbolaget SBB kommer av allt att döma att inleda nattågstrafik mellan Malmö och Basel eller Zürich i april 2026.
jarnvagar.nu
October 10, 2025 at 2:41 PM
Schweiziska tågbolaget SBB planerar i vår att inleda natttågstrafik mellan Malmö och Basel eller Zürich. Trafiken finansieras av en flygskatt - idén är ju att fler ska ta tåget. Tänk om den svenska regeringen haft liknande visioner. Men det är förstås för mycket begärt av Tidöpartierna.
Reposted by Carl Haster
when you try and get your PhD advisor to review your manuscript 😂
October 7, 2025 at 5:06 PM
when you try and get your PhD advisor to review your manuscript 😂
Reposted by Carl Haster
Valuable info about the Physics Nobel Prize today from Prof. Joseph Barranco at SFSU on Martinis and Devoret being a grad student and postdoc in Clarke's lab at UC Berkeley & Clark and Devoret being immigrants. "California *public* education made this happen. Immigration made this happen." ⚛️
October 7, 2025 at 5:53 PM
Valuable info about the Physics Nobel Prize today from Prof. Joseph Barranco at SFSU on Martinis and Devoret being a grad student and postdoc in Clarke's lab at UC Berkeley & Clark and Devoret being immigrants. "California *public* education made this happen. Immigration made this happen." ⚛️
Reposted by Carl Haster
See that small, moving splotch?
That's 3I/ATLAS, a comet that formed in a different star system, photographed from Mars orbit by the ESA Exomars Trace Gas Orbiter.
A comet from a DIFFERENT SOLAR SYSTEM photographed by a ROBOT ORBITING MARS
last Friday
That's 3I/ATLAS, a comet that formed in a different star system, photographed from Mars orbit by the ESA Exomars Trace Gas Orbiter.
A comet from a DIFFERENT SOLAR SYSTEM photographed by a ROBOT ORBITING MARS
last Friday
October 7, 2025 at 3:37 PM
See that small, moving splotch?
That's 3I/ATLAS, a comet that formed in a different star system, photographed from Mars orbit by the ESA Exomars Trace Gas Orbiter.
A comet from a DIFFERENT SOLAR SYSTEM photographed by a ROBOT ORBITING MARS
last Friday
That's 3I/ATLAS, a comet that formed in a different star system, photographed from Mars orbit by the ESA Exomars Trace Gas Orbiter.
A comet from a DIFFERENT SOLAR SYSTEM photographed by a ROBOT ORBITING MARS
last Friday
Reposted by Carl Haster
Oh dang. This is an excellent analogy.
October 4, 2025 at 2:01 AM
Oh dang. This is an excellent analogy.
Reposted by Carl Haster
Dame Sarah Mullally has been named the 106th Archbishop of Canterbury, becoming the first woman to hold the Church of England’s most senior clerical position. on.ft.com/3Kywkdg
October 3, 2025 at 9:37 AM
Dame Sarah Mullally has been named the 106th Archbishop of Canterbury, becoming the first woman to hold the Church of England’s most senior clerical position. on.ft.com/3Kywkdg
Reposted by Carl Haster
A little morning treat: Rosalind Franklin’s and R. G. Gosling’s confirmation of Watson and Crick’s DNA model. A part of Arne Engström’s collection. Engström was a key player in the Nobel assembly, held the Nobel speech to Watson and Crick, and was, as we can see, aware of Franklin’s contribution.
October 2, 2025 at 5:58 AM
A little morning treat: Rosalind Franklin’s and R. G. Gosling’s confirmation of Watson and Crick’s DNA model. A part of Arne Engström’s collection. Engström was a key player in the Nobel assembly, held the Nobel speech to Watson and Crick, and was, as we can see, aware of Franklin’s contribution.
Some heads up would've been good...
‘Completely shattered.’ Changes to NSF’s graduate student fellowship spur outcry
The announcement comes months later than usual, leaving many would-be applicants stranded
www.science.org
September 30, 2025 at 6:47 AM
Some heads up would've been good...
Reposted by Carl Haster
Here we go!
Over 13,000 H-1B workers have joined 200+ land-grant, sea-grant, and R1 research institutions so far this fiscal year.
I also found that public institutions in large, Republican states are disproportionately affected by Trump's $100,000 H1-B fee.
Find your state or your school:
Over 13,000 H-1B workers have joined 200+ land-grant, sea-grant, and R1 research institutions so far this fiscal year.
I also found that public institutions in large, Republican states are disproportionately affected by Trump's $100,000 H1-B fee.
Find your state or your school:
EXCLUSIVE: A new analysis by The Xylom's @alexip718.com shows for the first time just how much America’s top research institutions have grown to depend on H-1B skilled workers — and how this delicate balance might be disrupted by U.S. President Donald Trump’s crackdown on legal immigration.
The Most Detailed Maps of H-1B Visa Holders Joining America's Top Research Institutions
A new analysis by The Xylom shows for the first time just how much America’s top research institutions have grown to depend on the specialized knowledge of H-1B skilled workers — and how this…
www.thexylom.com
September 25, 2025 at 4:23 PM
Here we go!
Over 13,000 H-1B workers have joined 200+ land-grant, sea-grant, and R1 research institutions so far this fiscal year.
I also found that public institutions in large, Republican states are disproportionately affected by Trump's $100,000 H1-B fee.
Find your state or your school:
Over 13,000 H-1B workers have joined 200+ land-grant, sea-grant, and R1 research institutions so far this fiscal year.
I also found that public institutions in large, Republican states are disproportionately affected by Trump's $100,000 H1-B fee.
Find your state or your school:
Reposted by Carl Haster
I'm hiring 1-2 postdocs this year! If you're interested in:
GW astrophysics
(Binary) Stellar Evolution
Stellar dynamics (esp. w/ massive BHs)
Galactic dynamics (inc. stellar streams)
plz consider applying! You don't need letters initially, just a list of references.
🔭🧪
aas.org/jobregister/...
GW astrophysics
(Binary) Stellar Evolution
Stellar dynamics (esp. w/ massive BHs)
Galactic dynamics (inc. stellar streams)
plz consider applying! You don't need letters initially, just a list of references.
🔭🧪
aas.org/jobregister/...
Postdoctoral Associate Positions in Theoretical/Computational Astrophysics | American Astronomical Society
The Department of Physics and Astronomy at the University of North Carolina Chapel Hill invites applications for postdoctoral associates to conduct research in theoretical and computational astrophysi...
aas.org
September 25, 2025 at 5:33 PM
I'm hiring 1-2 postdocs this year! If you're interested in:
GW astrophysics
(Binary) Stellar Evolution
Stellar dynamics (esp. w/ massive BHs)
Galactic dynamics (inc. stellar streams)
plz consider applying! You don't need letters initially, just a list of references.
🔭🧪
aas.org/jobregister/...
GW astrophysics
(Binary) Stellar Evolution
Stellar dynamics (esp. w/ massive BHs)
Galactic dynamics (inc. stellar streams)
plz consider applying! You don't need letters initially, just a list of references.
🔭🧪
aas.org/jobregister/...
Reposted by Carl Haster
Job Announcement!
Postdoc in Gravitational Waves at University of Nottingham
* Two year position
* Deadline soon: 29 September
* Details and application form: jobs.nottingham.ac.uk/Vacancy.aspx...
Postdoc in Gravitational Waves at University of Nottingham
* Two year position
* Deadline soon: 29 September
* Details and application form: jobs.nottingham.ac.uk/Vacancy.aspx...
Job Vacancy at the University of Nottingham: Research Associate/Fellow (Fixed Term)
We are looking for a researcher, whose expertise lies in gravitational waves. They will be expected to conduct research on perturbative or nonperturbative waveform modelling, with applications to data...
jobs.nottingham.ac.uk
September 23, 2025 at 10:15 PM
Job Announcement!
Postdoc in Gravitational Waves at University of Nottingham
* Two year position
* Deadline soon: 29 September
* Details and application form: jobs.nottingham.ac.uk/Vacancy.aspx...
Postdoc in Gravitational Waves at University of Nottingham
* Two year position
* Deadline soon: 29 September
* Details and application form: jobs.nottingham.ac.uk/Vacancy.aspx...
Reposted by Carl Haster
imagine if a family of beavers randomly showed up right now and finished whatever thing you've been putting off
September 22, 2025 at 9:41 PM
imagine if a family of beavers randomly showed up right now and finished whatever thing you've been putting off
Reposted by Carl Haster
If you mash the audio example buttons on the wikipedia page for the IPA vowel sounds you can create a choir of mildly disgusted men
September 20, 2025 at 6:52 PM
If you mash the audio example buttons on the wikipedia page for the IPA vowel sounds you can create a choir of mildly disgusted men