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oskarkleincentre.bsky.social
Oskar Klein Centre
@oskarkleincentre.bsky.social
34 followers 23 following 11 posts
The Oskar Klein Centre for Cosmoparticle Physics.
https://www.okc.albanova.se/
Posts Replies Media Videos
oskarkleincentre.bsky.social
A recent paper in #MNRAS - an international collaboration with 11 OKC researchers involved.
rasjournals.bsky.social RAS Journals @rasjournals.bsky.social · Sep 16
Published in #MNRAS: "The ambiguous AT2022rze: changing-look AGN mimicking a supernova in a merging galaxy system", Pessi et al. This is Fig. 1: for the caption & to read the paper please visit academic.oup.com/mnras/articl... @oxfordacademic.bsky.social @royalastrosoc.bsky.social
Host images. Top left panel: colourized Legacy Survey (Dey et al. 2019) cut-out centred on AT2022rze. The position of the transient is marked with a red cross. The coordinates of the host as obtained from NED are shown with a black cross. A purple cross shows the coordinates of the AllWISE observations. A light blue cross shows the coordinates of the eROSITA observations, a dotted circle of the same colour with a 9.1 arcsec radius shows the 98 per cent error radius for these observations. Tentative VLASS radio continuum emission is shown as a blue contour. The grey ellipse marks the size of the VLASS beam. Top right panel: r-band Legacy Survey cutout centred on AT2022rze. A green and salmon circle denote the respective global and local regions considered for host characterization. Blue markers show constant value pixel contours. Cyan and orange dashed ellipses mark the respective fits to the smallest regions confined by the contours. For details, see Section 3.3. Bottom panel: Stamps associated with a ZTF g-band detection alert. Science, Template, and Difference of those, respectively. These were obtained from the Alerce broker (https://alerce.online/, Förster et al. 2021).
October 28, 2025 at 12:48 PM
Reposted by Oskar Klein Centre
fysinfo.bsky.social
You are welcome to join the zoom event on high energy physics on October 30th at 13.00!
Speakers: Frank Wilczek, Sara Strandberg, Oksana Iarygina, and Oliver Schlotterer. The event will be moderated by Jonas Enander.
You'll find the zoom link here: indico.fysik.su.se/event/9415/ Welcome!
October 23, 2025 at 8:15 AM
oskarkleincentre.bsky.social
We seek outstanding postdoctoral researchers, with background in computational, theoretical and/or observational projects, to develop and deploy cutting-edge machine-learning and AI methods for astrophysics and cosmology.

Apply: su.varbi.com/en/what:job/...
#Cosmology #Astrophysics #EDUCATECoE
Hiring: Postdoctoral fellows in Machine Learning for Astrophysics and Cosmology.
September 24, 2025 at 9:18 AM
oskarkleincentre.bsky.social
Can neutron-star tidal effects hide deviations from General Relativity? OKC researcher Alex Brown @stockholm-uni.bsky.social talks neutron-star tides and tests of gravity in the American Astronomical Society Journals Author Series.

#aasjournal #neutronstar #GravitationalWaves #astrophysics
aas.org American Astronomical Society (AAS) @aas.org · Sep 2
✨ New AAS Journal Author Series Video!
Stephanie (Alex) Brown (Stockholm University) chats about neutron star tides — what her latest article reveals and where the science takes us next. #Astronomy #TheGoodStuff

📺 Watch the full interview here: youtu.be/-HQK2jUW-hc
AAS Journal Author Series: Stephanie (Alex) Brown on 2025ApJ...982..133B
YouTube video by AAS
youtu.be
September 3, 2025 at 9:57 AM
Reposted by Oskar Klein Centre
stockholm-uni.bsky.social
A new study by scientists at @oskarkleincentre.bsky.social & @fysinfo.bsky.social have developed an AI-powered method to build a digital twin of the Universe—reconstructing its early state and simulating its entire evolution up to the galaxies we see today.
www.okc.albanova.se/news/leverag...
Leveraging AI to create a digital twin of the Universe - Oskar Klein Centre
OKC scientists unveil an AI method for a digital twin of the Universe—reconstructing the early state and simulating billions of years to match observations.
www.okc.albanova.se
September 2, 2025 at 6:49 AM
oskarkleincentre.bsky.social
OKC researchers presents an AI method to recover the Universe’s initial conditions and simulate forward—toward a digital twin of the cosmos. MNRAS (Aug 2025).

Details: www.okc.albanova.se/news/leverag...

#cosmology #AI #neuraloptimizer #Space
Infographic showing an AI-driven loop to build a digital twin of the Universe: Early Universe (initial conditions) → Simulation Output → Data Difference → Neural Optimizer (AI) → Update ICs → Run New Simulation, repeated until it matches observed galaxies.
September 3, 2025 at 8:28 AM
Reposted by Oskar Klein Centre
stockholm-uni.bsky.social
Astronomers from @oskarkleincentre.bsky.social participated in study of exploding star that lacks all of the most common elements in universe. This rare stripped star helps understanding how & where elements like sulphur & silicon form. New study in @nature.com.web.brid.gy
www.su.se/english/news...
New kind of supernova explosion reveals a naked star - Stockholm University
In the latest issue of the journal Nature, astronomers from Stockholm University participate in a study of an exploding star that lacks all of the most common elements in the Universe. This rare strip...
www.su.se
August 21, 2025 at 6:56 AM
oskarkleincentre.bsky.social
✨ Explore the cutting edge of cosmology! OKC's Jens Jasche reveals they're "Building Digital Twins of the Universe," & Ivelin Georgiev dives into "Direction Dependence of Photon Emission during Reionisation". Part of the CosmologyFromHome series.

#CosmologyFromHome2025 #OKC #Astrophysics #Cosmology
Jens Jasche - Building Digital Twins of the Universe
YouTube video by Cosmology from Home
www.youtube.com
July 8, 2025 at 5:32 AM
Reposted by Oskar Klein Centre
pomarede.bsky.social
Check this out: this a tactile model of the Cosmic Web, produced by Amelia Ortiz Gil and @vicentjm.bsky.social as part of their project: Tactile 3D models for research and outreach in astronomy.

The model used is the Cosmic V-Web inferred from Cosmicflows-2:
doi.org/10.3847/1538... #cosmology 🧪
A photography of a tactile model of the Cosmic Web, that is, the large scale structure of the Universe. It features a materialization of the Cosmic Web filaments, by means of a grey mesh, and a materialization of Cosmic Web knots, by means of filled, colored blobs. Such knots include: the Great Attractor, Perseus-Pisces, Shapley, Hercules, Norma. The location of our Home galaxy the Milky Way is at the center of the model.
March 6, 2025 at 4:39 PM
oskarkleincentre.bsky.social
🔭 The LSST telescope at @vrubinobs.bsky.social is live!

The OKC team looks forward to unprecedented surveys of transient events, enabling detailed studies of galaxy evolution, and precision research into dark matter and energy.

#LSST #OskarKleinCentre #Astronomy #Cosmology #DarkMatter #Supernovae
LSST telescope launched – New era of research at the Oskar Klein Centre - Oskar Klein Centre
The LSST at Vera C. Rubin Observatory powers Oskar Klein Centre’s research on supernovae, dark matter, and cosmic evolution in a new scientific era.
www.okc.albanova.se
July 3, 2025 at 8:08 AM
Reposted by Oskar Klein Centre
fysinfo.bsky.social
Welcome with your late application for courses and programs in physics on July 15.
www.su.se/department-o...
June 18, 2025 at 2:23 PM
Reposted by Oskar Klein Centre
fysinfo.bsky.social
Fysikum congratulates our PhD student David Sundelin, who successfully defended his thesis: “Isomers of ions in space and planetary atmospheres: Experimental and theoretical studies” on May 27 2025.
www.su.se/department-o...
David Sundelin's thesis in Chemical Physics - Department of Physics
Fysikum congratulates our PhD student David Sundelin, who successfully defended his thesis: “Isomers of ions in space and planetary atmospheres: Experimental and theoretical studies” on May 27 2025.
www.su.se
June 9, 2025 at 7:36 AM
oskarkleincentre.bsky.social
Astrofysiker Jens Jasche från OKC utses till ny AI-samordnare vid @stockholm-uni.bsky.social. Nytt tvärvetenskapligt AI-center etableras 2026 för att främja AI inom forskning och utbildning!

#AI #Vetenskap #StockholmsUniversitet #Forskning #Astrofysik
Jens Jasche ny AI-samordnare för Naturvetenskapliga fakulteten - Oskar Klein center
Astrofysikern Jens Jasche blir ny AI-samordnare vid Stockholms universitet, där han ska stärka och bredda AI-användningen inom forskning och utbildning. Läs om universitetets satsning och framtida AI-...
www.okc.albanova.se
March 27, 2025 at 12:21 PM
Reposted by Oskar Klein Centre
fysinfo.bsky.social
Welcome to an open lecture at AlbaNova!

Date: Thursday 3 April 2025
Time: 18.15 – 19.15
Location: Oskar Klein Auditorium (FR4), AlbaNova University Centre, Roslagstullsbacken 21

Title: DESIREE: A unique instrument for laboratory astrophysics.
www.su.se/department-o...
Professor Henning Schmidt will give an open lecture at AlbaNova on April 3, 2025
March 14, 2025 at 8:57 AM
Reposted by Oskar Klein Centre
fysinfo.bsky.social
Welcome to AlbaNova for an open lecture

Date: Thursday 20 March 2025
Time: 18.15 – 19.15
Location: Oskar Klein Auditorium (FR4), AlbaNova University Centre, Roslagstullsbacken 21
Title: Gravitational waves: Ripples in Space and Time and a New Way to Understand the Universe
www.su.se/department-o...
Haakon Andresen gives an open lecture at AlbaNova on March 20, 2025
March 14, 2025 at 8:54 AM
oskarkleincentre.bsky.social
Exciting new research from @akhostov.bsky.social and the COSMOS team has been posted on arXiv today (arxiv.org/abs/2503.00120)! At the Oskar Klein Centre, we are eager to explore how these data can contribute to our own work on galaxy modeling (e.g., arxiv.org/abs/2406.19437).

#Astrophysics
COSMOS Spectroscopic Redshift Compilation (First Data Release): 165k Redshifts Encompassing Two Decades of Spectroscopy
We present the COSMOS Spectroscopic Redshift Compilation encompassing ~ 20 years of spectroscopic redshifts within the 2 deg$^2$ COSMOS legacy field. This compilation contains 165,312 redshifts of 97,...
arxiv.org
March 4, 2025 at 12:44 PM
oskarkleincentre.bsky.social
💥 3,628 stellar explosions reshaping our view of the Universe. Novel ZTF data (20+ publications) reveals clues on cosmic expansion & Type Ia supernovae.

This analysis by the OKC @stockholm-uni.bsky.social refines our understanding of dark energy.

#Supernovae #Cosmology #ZTF #Astrophysics
The Zwicky Transient Facility observed over 3,500 “standard candle” supernova explosions - Stockholm University
The Zwicky Transient Facility observed over 3,500 “standard candle” supernova explosions The Zwicky Transient Facility (ZTF) collaboration has announced a major milestone in the study of cosmic expan...
www.su.se
February 26, 2025 at 9:55 AM