Ghazal Geshnizjani
@ghazalgesh.bsky.social
Scientist, Physics, Mathematics
https://ghazalgeshnizjani.wordpress.com/
The posts here are my personal views.
https://ghazalgeshnizjani.wordpress.com/
The posts here are my personal views.
Pinned
🚀 Paper Day! How Much NEC Breaking Can the Universe Endure?
Quantum fields violate NEC.
As an example of a semilocal quantum-motivated energy condition, check out the parameter space over which SNEC, is consistent with the recent results from #DESI.
@perimeterinstitute.ca @desisurvey.bsky.social
Quantum fields violate NEC.
As an example of a semilocal quantum-motivated energy condition, check out the parameter space over which SNEC, is consistent with the recent results from #DESI.
@perimeterinstitute.ca @desisurvey.bsky.social
Reposted by Ghazal Geshnizjani
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...
@bot.astronomy.blue signup
Why dark energy does not rule out a cyclic cosmos. @nafshordi.bsky.social and I debunk this commonly held myth in our new video www.youtube.com/watch?v=dHzo...
Big Bang myths . Does dark energy disprove a cyclic cosmos?
YouTube video by Phil Halper (aka Skydivephil)
www.youtube.com
September 12, 2025 at 3:23 PM
@bot.astronomy.blue signup
Reposted by Ghazal Geshnizjani
I’m doing a public talk with @perimeterinstitute.ca in Waterloo!
www.eventbrite.ca/e/how-the-un...
(Tickets are free but you have to be quick — Eventbrite ticket reservations open at 9am Eastern Sep 2, which is in… 5 minutes)
www.eventbrite.ca/e/how-the-un...
(Tickets are free but you have to be quick — Eventbrite ticket reservations open at 9am Eastern Sep 2, which is in… 5 minutes)
How the Universe Ends - Katie Mack (CIGI)
The Big Bang started the universe 13.8B years ago - but how might it end? Here's what modern astrophysics says about its ultimate fate.
www.eventbrite.ca
September 2, 2025 at 12:55 PM
I’m doing a public talk with @perimeterinstitute.ca in Waterloo!
www.eventbrite.ca/e/how-the-un...
(Tickets are free but you have to be quick — Eventbrite ticket reservations open at 9am Eastern Sep 2, which is in… 5 minutes)
www.eventbrite.ca/e/how-the-un...
(Tickets are free but you have to be quick — Eventbrite ticket reservations open at 9am Eastern Sep 2, which is in… 5 minutes)
Reposted by Ghazal Geshnizjani
At least 62 Palestinians killed across enclave in Israeli attacks, as two more malnutrition deaths are recorded.
Death toll from starvation in Gaza rises to 115 as Israeli attacks continue
At least 62 Palestinians killed across enclave in Israeli attacks, as two more malnutrition deaths are recorded.
bit.ly
July 25, 2025 at 12:30 AM
At least 62 Palestinians killed across enclave in Israeli attacks, as two more malnutrition deaths are recorded.
Reposted by Ghazal Geshnizjani
"Merger of two massive black holes is one for the record books"
@jenlucpiquant.bsky.social reports on our LIGO @egovirgo.bsky.social KAGRA discovery of #GW231123
arstechnica.com/science/2025...
🔭🧪⚛️
@jenlucpiquant.bsky.social reports on our LIGO @egovirgo.bsky.social KAGRA discovery of #GW231123
arstechnica.com/science/2025...
🔭🧪⚛️
Merger of two massive black holes is one for the record books
The event resulted in a new black hole with a mass 225 times larger than our Sun.
arstechnica.com
July 15, 2025 at 1:09 PM
"Merger of two massive black holes is one for the record books"
@jenlucpiquant.bsky.social reports on our LIGO @egovirgo.bsky.social KAGRA discovery of #GW231123
arstechnica.com/science/2025...
🔭🧪⚛️
@jenlucpiquant.bsky.social reports on our LIGO @egovirgo.bsky.social KAGRA discovery of #GW231123
arstechnica.com/science/2025...
🔭🧪⚛️
Reposted by Ghazal Geshnizjani
Friends Branding together to check on expats' elderly parents in Tehran, doctors staying in dangerous places providing free care, folks in rural areas providing free housing, food, and car rides, these are Iranian stories that you won't hear in the msm. We are human too and deserve to live.
June 19, 2025 at 5:18 PM
Friends Branding together to check on expats' elderly parents in Tehran, doctors staying in dangerous places providing free care, folks in rural areas providing free housing, food, and car rides, these are Iranian stories that you won't hear in the msm. We are human too and deserve to live.
Reposted by Ghazal Geshnizjani
The White House has confirmed that “We” means the United States but won’t provide any other details.
“WE” not “Israel”
This is President Trump indicating that the United States is now part of the war between Israel and Iran.
This is President Trump indicating that the United States is now part of the war between Israel and Iran.
June 17, 2025 at 4:35 PM
The White House has confirmed that “We” means the United States but won’t provide any other details.
Reposted by Ghazal Geshnizjani
Tehran, home to 10 million people, suffers from severe traffic congestion making a speedy evacuation impossible.
Trump warns Tehran residents to ‘evacuate immediately’. But can they?
Tehran, home to 10 million people, suffers from severe traffic congestion making a speedy evacuation impossible.
bit.ly
June 17, 2025 at 5:00 PM
Tehran, home to 10 million people, suffers from severe traffic congestion making a speedy evacuation impossible.
"Modeling Gravitational Wave Bias from 3D Power Spectra of Spectroscopic Surveys" is out!🔭
Led by Dorsa Sadat Hosseini and a great collaboration with Amir Dehghani, Leo Kim, Alex Krolewski, and Suvodip Mukherjee across different institutes.
@jjlkim.bsky.social
@perimeterinstitute.ca @uwaterloo.ca
Led by Dorsa Sadat Hosseini and a great collaboration with Amir Dehghani, Leo Kim, Alex Krolewski, and Suvodip Mukherjee across different institutes.
@jjlkim.bsky.social
@perimeterinstitute.ca @uwaterloo.ca
The Gravitational Wave Bias Parameter from Angular Power Spectra: Bridging Between Galaxies and Binary Black Holes
https://arxiv.org/pdf/2411.11965
Amir Dehghani, J. Leo Kim, Dorsa Sadat Hosseini, Alex Krolewski, Suvodip Mukherjee, Ghazal Geshnizjani
https://arxiv.org/pdf/2411.11965
Amir Dehghani, J. Leo Kim, Dorsa Sadat Hosseini, Alex Krolewski, Suvodip Mukherjee, Ghazal Geshnizjani
The Gravitational Wave Bias Parameter from Angular Power Spectra: Bridging Between Galaxies and Binary Black Holes
arXiv abstract link
arxiv.org
June 17, 2025 at 4:32 PM
"Modeling Gravitational Wave Bias from 3D Power Spectra of Spectroscopic Surveys" is out!🔭
Led by Dorsa Sadat Hosseini and a great collaboration with Amir Dehghani, Leo Kim, Alex Krolewski, and Suvodip Mukherjee across different institutes.
@jjlkim.bsky.social
@perimeterinstitute.ca @uwaterloo.ca
Led by Dorsa Sadat Hosseini and a great collaboration with Amir Dehghani, Leo Kim, Alex Krolewski, and Suvodip Mukherjee across different institutes.
@jjlkim.bsky.social
@perimeterinstitute.ca @uwaterloo.ca
Reposted by Ghazal Geshnizjani
Iran’s air defence batteries have been firing overnight in the capital Tehran to counter a fourth night of Israeli strikes.
Iranian officials say Israeli attacks have killed more than 224 people, including 70 women and children.
Iranian officials say Israeli attacks have killed more than 224 people, including 70 women and children.
June 16, 2025 at 8:43 AM
Iran’s air defence batteries have been firing overnight in the capital Tehran to counter a fourth night of Israeli strikes.
Iranian officials say Israeli attacks have killed more than 224 people, including 70 women and children.
Iranian officials say Israeli attacks have killed more than 224 people, including 70 women and children.
Reposted by Ghazal Geshnizjani
My institute, Kavli-IPMU at the university of Tokyo is hiring early career researchers whose work has been disrupted due to difficult circumstances due to events happening at various places currently in the world. Please repost and encourage them to apply. 🙏🏻 www.ipmu.jp/en/job-oppor...
Special Postdoctoral Positions for displaced scientists (2025)
The Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), WPI at the University of Tokyo solicits applications for its special Postdoctoral Fellowship program.
www.ipmu.jp
June 8, 2025 at 3:07 PM
My institute, Kavli-IPMU at the university of Tokyo is hiring early career researchers whose work has been disrupted due to difficult circumstances due to events happening at various places currently in the world. Please repost and encourage them to apply. 🙏🏻 www.ipmu.jp/en/job-oppor...
Reposted by Ghazal Geshnizjani
How did the universe begin?
PI researcher Niayesh Afshordi unpacks the history of the Big Bang theory and what the evidence tells us about the universe’s beginnings: perimeterinstitute.ca/news/perimet...
PI researcher Niayesh Afshordi unpacks the history of the Big Bang theory and what the evidence tells us about the universe’s beginnings: perimeterinstitute.ca/news/perimet...
Perimeter researcher tells the real history of the Big Bang | PI News
perimeterinstitute.ca
June 4, 2025 at 2:14 PM
How did the universe begin?
PI researcher Niayesh Afshordi unpacks the history of the Big Bang theory and what the evidence tells us about the universe’s beginnings: perimeterinstitute.ca/news/perimet...
PI researcher Niayesh Afshordi unpacks the history of the Big Bang theory and what the evidence tells us about the universe’s beginnings: perimeterinstitute.ca/news/perimet...
Do jets really need two wings? Think of the budget cuts if they only had one! @ligo.org
For multimessenger astronomy, you really need 3 detectors online to localise sources. With KAGRA all having a long way to catch up, and LIGO India only just starting construction, we'll have many years before we could make it back to current abilities even if everything goes perfectly
May 31, 2025 at 1:05 AM
Do jets really need two wings? Think of the budget cuts if they only had one! @ligo.org
Reposted by Ghazal Geshnizjani
NSF budget would close down one of LIGO's sites. This would be, to put it lightly, a catastrophe for gravitational wave astronomy.
"In FY 2026 NSF will operate only one of the two sites
and will support a reduced level for technology development."
bsky.app/profile/hast...
"In FY 2026 NSF will operate only one of the two sites
and will support a reduced level for technology development."
bsky.app/profile/hast...
May 30, 2025 at 8:47 PM
NSF budget would close down one of LIGO's sites. This would be, to put it lightly, a catastrophe for gravitational wave astronomy.
"In FY 2026 NSF will operate only one of the two sites
and will support a reduced level for technology development."
bsky.app/profile/hast...
"In FY 2026 NSF will operate only one of the two sites
and will support a reduced level for technology development."
bsky.app/profile/hast...
Reposted by Ghazal Geshnizjani
@nafshordi.bsky.social and I had a blast talking about our new book The Battle of the Big Bang with the legendary @seanmcarroll.bsky.social . You can check it out here: www.youtube.com/watch?v=iG1I...
Mindscape 316 | Niayesh Afshordi and Phil Halper on the Big Bang and Before
YouTube video by Sean Carroll
www.youtube.com
May 26, 2025 at 4:53 PM
@nafshordi.bsky.social and I had a blast talking about our new book The Battle of the Big Bang with the legendary @seanmcarroll.bsky.social . You can check it out here: www.youtube.com/watch?v=iG1I...
Thicket may go very fast, but you can also join the live stream 🙂 @nafshordi.bsky.social
Tickets for Niayesh Afshordi's free public lecture on "Battle of the Big Bang" will go live on Eventbrite on Monday, May 26 at 9 AM.
Join us at Perimeter Institute or watch our YouTube livestream on Wednesday, June 4 at 7 PM.
Set a reminder and read event details: www.eventbrite.ca/e/battle-of-...
Join us at Perimeter Institute or watch our YouTube livestream on Wednesday, June 4 at 7 PM.
Set a reminder and read event details: www.eventbrite.ca/e/battle-of-...
May 23, 2025 at 3:16 PM
Thicket may go very fast, but you can also join the live stream 🙂 @nafshordi.bsky.social
Reposted by Ghazal Geshnizjani
My new book review is out! My goodness did this one take me on a journey… thanks for a great read @philhalper.bsky.social @nafshordi.bsky.social 🔭📖
physicsworld.com/a/beyond-the...
physicsworld.com/a/beyond-the...
Beyond the Big Bang: reopening the doors on how it all began – Physics World
Emma Chapman reviews Battle of the Big Bang: The New Tales of Our Cosmic Origins by Niayesh Afshordi and Phil Halper
physicsworld.com
May 8, 2025 at 12:32 PM
My new book review is out! My goodness did this one take me on a journey… thanks for a great read @philhalper.bsky.social @nafshordi.bsky.social 🔭📖
physicsworld.com/a/beyond-the...
physicsworld.com/a/beyond-the...
Reposted by Ghazal Geshnizjani
#BattleoftheBigBang is finally here!
Take advantage of a 30% discount by using this discount code (UCPNEW) when ordering from:
press.uchicago.edu/ucp/books/bo...
Take advantage of a 30% discount by using this discount code (UCPNEW) when ordering from:
press.uchicago.edu/ucp/books/bo...
May 2, 2025 at 1:41 AM
#BattleoftheBigBang is finally here!
Take advantage of a 30% discount by using this discount code (UCPNEW) when ordering from:
press.uchicago.edu/ucp/books/bo...
Take advantage of a 30% discount by using this discount code (UCPNEW) when ordering from:
press.uchicago.edu/ucp/books/bo...
🚀 Paper Day! How Much NEC Breaking Can the Universe Endure?
Quantum fields violate NEC.
As an example of a semilocal quantum-motivated energy condition, check out the parameter space over which SNEC, is consistent with the recent results from #DESI.
@perimeterinstitute.ca @desisurvey.bsky.social
Quantum fields violate NEC.
As an example of a semilocal quantum-motivated energy condition, check out the parameter space over which SNEC, is consistent with the recent results from #DESI.
@perimeterinstitute.ca @desisurvey.bsky.social
March 27, 2025 at 4:14 PM
🚀 Paper Day! How Much NEC Breaking Can the Universe Endure?
Quantum fields violate NEC.
As an example of a semilocal quantum-motivated energy condition, check out the parameter space over which SNEC, is consistent with the recent results from #DESI.
@perimeterinstitute.ca @desisurvey.bsky.social
Quantum fields violate NEC.
As an example of a semilocal quantum-motivated energy condition, check out the parameter space over which SNEC, is consistent with the recent results from #DESI.
@perimeterinstitute.ca @desisurvey.bsky.social
Reposted by Ghazal Geshnizjani
Hello, London!
I’m thrilled that I’ll be speaking at the iconic Royal Institution @ri-science.bsky.social on June 28th about #BattleoftheBigBang, which is also the topic of my upcoming book by @uchicagopress.bsky.social with @philhalper.bsky.social
Book your tickets here: rigb.org/whats-on/bat...
I’m thrilled that I’ll be speaking at the iconic Royal Institution @ri-science.bsky.social on June 28th about #BattleoftheBigBang, which is also the topic of my upcoming book by @uchicagopress.bsky.social with @philhalper.bsky.social
Book your tickets here: rigb.org/whats-on/bat...
Battle of the Big Bang
Astrophysicist Niayesh Afshordi explores the latest debates on the origin of our universe.
rigb.org
March 25, 2025 at 1:47 AM
Hello, London!
I’m thrilled that I’ll be speaking at the iconic Royal Institution @ri-science.bsky.social on June 28th about #BattleoftheBigBang, which is also the topic of my upcoming book by @uchicagopress.bsky.social with @philhalper.bsky.social
Book your tickets here: rigb.org/whats-on/bat...
I’m thrilled that I’ll be speaking at the iconic Royal Institution @ri-science.bsky.social on June 28th about #BattleoftheBigBang, which is also the topic of my upcoming book by @uchicagopress.bsky.social with @philhalper.bsky.social
Book your tickets here: rigb.org/whats-on/bat...
سال نو مبارک و نوروزتان پیروز.
امیدوارم آغاز بهار و سال جدید با همنوع دوستی، مهربانی و خردمندی بیشتر رقم بخوره 🙂 🐣 🪻🌱
Happy Nowruz,
May the new turn of earth around the sun brings us all more empathy for each other, kindness, and wisdom. #Nowruz @perimeterinstitute.ca
امیدوارم آغاز بهار و سال جدید با همنوع دوستی، مهربانی و خردمندی بیشتر رقم بخوره 🙂 🐣 🪻🌱
Happy Nowruz,
May the new turn of earth around the sun brings us all more empathy for each other, kindness, and wisdom. #Nowruz @perimeterinstitute.ca
March 20, 2025 at 7:03 PM
سال نو مبارک و نوروزتان پیروز.
امیدوارم آغاز بهار و سال جدید با همنوع دوستی، مهربانی و خردمندی بیشتر رقم بخوره 🙂 🐣 🪻🌱
Happy Nowruz,
May the new turn of earth around the sun brings us all more empathy for each other, kindness, and wisdom. #Nowruz @perimeterinstitute.ca
امیدوارم آغاز بهار و سال جدید با همنوع دوستی، مهربانی و خردمندی بیشتر رقم بخوره 🙂 🐣 🪻🌱
Happy Nowruz,
May the new turn of earth around the sun brings us all more empathy for each other, kindness, and wisdom. #Nowruz @perimeterinstitute.ca
Reposted by Ghazal Geshnizjani
Thank you.
We're strongest when we are united.
We're strongest when we are united.
March 9, 2025 at 11:26 PM
Thank you.
We're strongest when we are united.
We're strongest when we are united.
If you’ve been hoping origin of cosmos could be less dramatic than current affairs, here’s a rigorous work by Amir Dehghani, Jerome Quintin & me showing Cuscuton bounce has no strong coupling problems & is within observational non-Gaussianity bounds.
#cosmology @perimeterinstitute.ca @uwaterloo.ca
#cosmology @perimeterinstitute.ca @uwaterloo.ca
Cuscuton Bounce Beyond the Linear Regime: Bispectrum and Strong Coupling Constraints. Amir Dehghani et. al. https://arxiv.org/abs/2503.01992
March 5, 2025 at 4:29 PM
If you’ve been hoping origin of cosmos could be less dramatic than current affairs, here’s a rigorous work by Amir Dehghani, Jerome Quintin & me showing Cuscuton bounce has no strong coupling problems & is within observational non-Gaussianity bounds.
#cosmology @perimeterinstitute.ca @uwaterloo.ca
#cosmology @perimeterinstitute.ca @uwaterloo.ca
Reposted by Ghazal Geshnizjani
After going quiet on bird flu, CDC scientists have published a report on its spread among veterinarians. The findings suggest a need for better surveillance.
After delay, CDC releases data signaling bird flu spread undetected in cows and people
After going quiet on bird flu, CDC scientists have published a report on its spread among veterinarians. The findings suggest a need for better surveillance.
www.npr.org
February 13, 2025 at 6:16 PM
After going quiet on bird flu, CDC scientists have published a report on its spread among veterinarians. The findings suggest a need for better surveillance.
Reposted by Ghazal Geshnizjani
This is the first time that the ring of light surrounding the centre of NGC 6505 is detected, thanks to Euclid’s high-resolution instruments.
🔭🧪
#cosmology
🔭🧪
#cosmology
February 10, 2025 at 8:31 AM
This is the first time that the ring of light surrounding the centre of NGC 6505 is detected, thanks to Euclid’s high-resolution instruments.
🔭🧪
#cosmology
🔭🧪
#cosmology