Niko
@nikosarcevic.com
human person (she)
| cosmologist at Duke University
| member of @LSSTDESC @Roman
| did physics @XENONexperiment
| loves plots, coats, and The Wire
| opinions mine
| cosmologist at Duke University
| member of @LSSTDESC @Roman
| did physics @XENONexperiment
| loves plots, coats, and The Wire
| opinions mine
Hate whatever this thing is
(Respectfully)
(Respectfully)
"It is giving evil Olaf from Frozen," as said by the observant person who captured these amazing photos of an insect-colonizing fungus species, Erynia rhizospora, on a caddisfly.
August 4, 2026 at 10:52 PM
Not sure if I ever shared but I’m obsessed with lighting (hello, photons! 😆)
I have so many lamps, plugins etc it’s embarrassing at this point.
But in any case I just bought a new lamp and it’s so freaking gorgeous I caaaaaant
I have so many lamps, plugins etc it’s embarrassing at this point.
But in any case I just bought a new lamp and it’s so freaking gorgeous I caaaaaant
August 1, 2026 at 10:27 PM
Not sure if I ever shared but I’m obsessed with lighting (hello, photons! 😆)
I have so many lamps, plugins etc it’s embarrassing at this point.
But in any case I just bought a new lamp and it’s so freaking gorgeous I caaaaaant
I have so many lamps, plugins etc it’s embarrassing at this point.
But in any case I just bought a new lamp and it’s so freaking gorgeous I caaaaaant
I’m deeply honored to share I am now a builder within LSST DESC!
This means I have made significant contributions to the collaboration I am in position to be added to every publication from now on (with certain caveats)
This means I have made significant contributions to the collaboration I am in position to be added to every publication from now on (with certain caveats)
July 24, 2026 at 4:49 PM
I’m deeply honored to share I am now a builder within LSST DESC!
This means I have made significant contributions to the collaboration I am in position to be added to every publication from now on (with certain caveats)
This means I have made significant contributions to the collaboration I am in position to be added to every publication from now on (with certain caveats)
An obligatory selfie! @scipyconf.bsky.social 🐍💙
July 16, 2026 at 3:24 PM
An obligatory selfie! @scipyconf.bsky.social 🐍💙
Reposted by Niko
The 25th annual #SciPy2026 conference is only two weeks away!
Join us in Minnesota or virtually for a plethora of scientific Python talks, including the Physics and Astronomy track 👀 see the full schedule at scipy2026.scipy.org/schedule
You can sign up here 👉 ti.to/scipy/scipy2026
Join us in Minnesota or virtually for a plethora of scientific Python talks, including the Physics and Astronomy track 👀 see the full schedule at scipy2026.scipy.org/schedule
You can sign up here 👉 ti.to/scipy/scipy2026
June 29, 2026 at 5:59 PM
The 25th annual #SciPy2026 conference is only two weeks away!
Join us in Minnesota or virtually for a plethora of scientific Python talks, including the Physics and Astronomy track 👀 see the full schedule at scipy2026.scipy.org/schedule
You can sign up here 👉 ti.to/scipy/scipy2026
Join us in Minnesota or virtually for a plethora of scientific Python talks, including the Physics and Astronomy track 👀 see the full schedule at scipy2026.scipy.org/schedule
You can sign up here 👉 ti.to/scipy/scipy2026
Conference photos are in! @perimeterinstitute.ca 🤩
June 15, 2026 at 2:59 PM
Conference photos are in! @perimeterinstitute.ca 🤩
Fresh on the @arxiv 💪
Check out how baryons and nonlinear galaxy bias (and scales) impact the 3x2pt analysis in the LSST scenario
arxiv.org/abs/2606.10679
Check out how baryons and nonlinear galaxy bias (and scales) impact the 3x2pt analysis in the LSST scenario
arxiv.org/abs/2606.10679
June 11, 2026 at 3:28 AM
Fresh on the @arxiv 💪
Check out how baryons and nonlinear galaxy bias (and scales) impact the 3x2pt analysis in the LSST scenario
arxiv.org/abs/2606.10679
Check out how baryons and nonlinear galaxy bias (and scales) impact the 3x2pt analysis in the LSST scenario
arxiv.org/abs/2606.10679
Old pals catching up @marcobonici.bsky.social
June 10, 2026 at 12:56 AM
Old pals catching up @marcobonici.bsky.social
I’ve been obsessed with Langewiesche’s writing since I discovered his @theatlantic.com articles.
If someone had told me I’d be into a book about shipping and maritime stuff, man…
He was such a master of narrative nonfiction that he can make any subject fascinating.
If someone had told me I’d be into a book about shipping and maritime stuff, man…
He was such a master of narrative nonfiction that he can make any subject fascinating.
June 9, 2026 at 1:14 AM
I’ve been obsessed with Langewiesche’s writing since I discovered his @theatlantic.com articles.
If someone had told me I’d be into a book about shipping and maritime stuff, man…
He was such a master of narrative nonfiction that he can make any subject fascinating.
If someone had told me I’d be into a book about shipping and maritime stuff, man…
He was such a master of narrative nonfiction that he can make any subject fascinating.
Reposted by Niko
cloelib: A Flexible Python Library for Computing Cosmological Observables in the Euclid Era. Marco Bonici et. al. https://arxiv.org/abs/2605.23839
May 29, 2026 at 12:53 PM
cloelib: A Flexible Python Library for Computing Cosmological Observables in the Euclid Era. Marco Bonici et. al. https://arxiv.org/abs/2605.23839
Over on Twitter a debate of medical doctor vs PhD and who is in the “right” is peeking its head again. I guess we have to have it at least once a year 😂
For me it’s always an excuse to pull this gem out
Also: RIP Andre. What an actor he was. Pembleton forever!
youtu.be/xYOK-2Q75wE?...
For me it’s always an excuse to pull this gem out
Also: RIP Andre. What an actor he was. Pembleton forever!
youtu.be/xYOK-2Q75wE?...
a PhD is a doctorate, it is literally describing a doctor -- Brooklyn 99
YouTube video by Estefanía Torres
youtu.be
May 25, 2026 at 7:39 PM
Over on Twitter a debate of medical doctor vs PhD and who is in the “right” is peeking its head again. I guess we have to have it at least once a year 😂
For me it’s always an excuse to pull this gem out
Also: RIP Andre. What an actor he was. Pembleton forever!
youtu.be/xYOK-2Q75wE?...
For me it’s always an excuse to pull this gem out
Also: RIP Andre. What an actor he was. Pembleton forever!
youtu.be/xYOK-2Q75wE?...
If someone told me 10 years ago that I’d be giving a talk at @scipyconf.bsky.social, I would’ve called them crazy.
I’m incredibly honored that the SciPy organizers think derivkit is worthy of a talk!
Thank you, SciPy team 🥹🥹🥹🥹
I’m incredibly honored that the SciPy organizers think derivkit is worthy of a talk!
Thank you, SciPy team 🥹🥹🥹🥹
May 7, 2026 at 2:34 AM
If someone told me 10 years ago that I’d be giving a talk at @scipyconf.bsky.social, I would’ve called them crazy.
I’m incredibly honored that the SciPy organizers think derivkit is worthy of a talk!
Thank you, SciPy team 🥹🥹🥹🥹
I’m incredibly honored that the SciPy organizers think derivkit is worthy of a talk!
Thank you, SciPy team 🥹🥹🥹🥹
Reposted by Niko
🚨🚨🚨 Only a few weeks left to apply for summer schools in physics (MSc / junior PhD):
• Dark Universe - May 10
• Quantum Gravity & Quantum Chaos - May 10
• Scientific ML - May 15
• Dark Universe - May 10
• Quantum Gravity & Quantum Chaos - May 10
• Scientific ML - May 15
PSI – Petnica Summer Institute
Intensive summer schools in theoretical physics, phenomenology, quantum technologies, and machine learning at the Petnica Science Center, Serbia.
psi.petnica.rs
April 23, 2026 at 6:04 PM
🚨🚨🚨 Only a few weeks left to apply for summer schools in physics (MSc / junior PhD):
• Dark Universe - May 10
• Quantum Gravity & Quantum Chaos - May 10
• Scientific ML - May 15
• Dark Universe - May 10
• Quantum Gravity & Quantum Chaos - May 10
• Scientific ML - May 15
Fresh on @arxiv 🥳🥳🥳🥳
Blinding in cosmology is especially challenging: unlike particle physics, our signal is statistical, subtle, and extracted through a long inference chain.
Excited to share the official LSST DESC tool for blind analyses:
arxiv.org/abs/2604.18111
Blinding in cosmology is especially challenging: unlike particle physics, our signal is statistical, subtle, and extracted through a long inference chain.
Excited to share the official LSST DESC tool for blind analyses:
arxiv.org/abs/2604.18111
April 21, 2026 at 3:22 PM
Fresh on @arxiv 🥳🥳🥳🥳
Blinding in cosmology is especially challenging: unlike particle physics, our signal is statistical, subtle, and extracted through a long inference chain.
Excited to share the official LSST DESC tool for blind analyses:
arxiv.org/abs/2604.18111
Blinding in cosmology is especially challenging: unlike particle physics, our signal is statistical, subtle, and extracted through a long inference chain.
Excited to share the official LSST DESC tool for blind analyses:
arxiv.org/abs/2604.18111
Reposted by Niko
Episode 24 | Nikolina Sarcevic on Modern Cosmology
YouTube video by The Knowmads Podcast
youtube.com
April 20, 2026 at 2:16 AM
How awesome is this?!
Witness breathtaking drone footage capturing the fiery heart of a volcanic eruption. A new era of vulcanology is here, revealing nature's power like never before.
April 17, 2026 at 5:40 PM
How awesome is this?!
Reposted by Niko
SBI Field Level Inference workshop at Perimeter this June
Hurry up!
events.perimeterinstitute.ca/event/1924/
Hurry up!
events.perimeterinstitute.ca/event/1924/
Advancing Field-level and Simulation-based Inference for Cosmology
Field-level inference has recently emerged as a powerful alternative to traditional summary-statistic approaches in the analysis of cosmological data sets. This technique exploits the full information...
events.perimeterinstitute.ca
March 30, 2026 at 9:14 PM
SBI Field Level Inference workshop at Perimeter this June
Hurry up!
events.perimeterinstitute.ca/event/1924/
Hurry up!
events.perimeterinstitute.ca/event/1924/
Working on the problem from two completely different angles is the best part of this project we’ve been hammering for months
Matthijs: pristine, elegant, mathematically flawless
Niko: “okay but imagine the posterior is a traffic cone…”
Somehow… we are both correct 🤣🤣
Matthijs: pristine, elegant, mathematically flawless
Niko: “okay but imagine the posterior is a traffic cone…”
Somehow… we are both correct 🤣🤣
a man wearing a witch hat is surrounded by orange cones
ALT: a man wearing a witch hat is surrounded by orange cones
media.tenor.com
March 24, 2026 at 1:57 AM
Working on the problem from two completely different angles is the best part of this project we’ve been hammering for months
Matthijs: pristine, elegant, mathematically flawless
Niko: “okay but imagine the posterior is a traffic cone…”
Somehow… we are both correct 🤣🤣
Matthijs: pristine, elegant, mathematically flawless
Niko: “okay but imagine the posterior is a traffic cone…”
Somehow… we are both correct 🤣🤣
Apparently Matthew McConaughey was at Duke today and I missed meeting him because I was stuck in telecons/working from home
This is NOT alright alright alright
I’m really upset
This is NOT alright alright alright
I’m really upset
a close up of a man 's face with a smile on his face
ALT: a close up of a man 's face with a smile on his face
media.tenor.com
March 21, 2026 at 2:19 AM
Apparently Matthew McConaughey was at Duke today and I missed meeting him because I was stuck in telecons/working from home
This is NOT alright alright alright
I’m really upset
This is NOT alright alright alright
I’m really upset
Minor pet peeve: describing ΛCDM-based analyses as having the “potential to discover new physics.”
They can reveal tensions or inconsistencies that may motivate extensions to the model — but that’s not the same as discovering new physics.
Cmon my man, tone that down
They can reveal tensions or inconsistencies that may motivate extensions to the model — but that’s not the same as discovering new physics.
Cmon my man, tone that down
a man with a beard is holding a microphone in front of a crowd .
ALT: a man with a beard is holding a microphone in front of a crowd .
media.tenor.com
March 16, 2026 at 1:10 PM
Minor pet peeve: describing ΛCDM-based analyses as having the “potential to discover new physics.”
They can reveal tensions or inconsistencies that may motivate extensions to the model — but that’s not the same as discovering new physics.
Cmon my man, tone that down
They can reveal tensions or inconsistencies that may motivate extensions to the model — but that’s not the same as discovering new physics.
Cmon my man, tone that down
Happy bday, arXiv! You are the best!
Funny coincidence is that I chose to wear one of my arXiv shirts (which are top quality btw! Hoodies as well, highly recommend)
Funny coincidence is that I chose to wear one of my arXiv shirts (which are top quality btw! Hoodies as well, highly recommend)
March 14, 2026 at 1:28 AM
Happy bday, arXiv! You are the best!
Funny coincidence is that I chose to wear one of my arXiv shirts (which are top quality btw! Hoodies as well, highly recommend)
Funny coincidence is that I chose to wear one of my arXiv shirts (which are top quality btw! Hoodies as well, highly recommend)
I am a science machine 💪💪💪💪
4th paper fresh on the @arxiv.bsky.social this year 🥳🥳🥳
arxiv.org/pdf/2603.09973
4th paper fresh on the @arxiv.bsky.social this year 🥳🥳🥳
arxiv.org/pdf/2603.09973
March 11, 2026 at 3:45 AM
I am a science machine 💪💪💪💪
4th paper fresh on the @arxiv.bsky.social this year 🥳🥳🥳
arxiv.org/pdf/2603.09973
4th paper fresh on the @arxiv.bsky.social this year 🥳🥳🥳
arxiv.org/pdf/2603.09973