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  • Stockholm - Photo by Raphael Andres. Twelve postdoctoral positions at the Oskar Klein Centre for Cosmoparticle Physics, Stockholm 2019-11-22 Postdoctoral positions in cosmology, multimessenger and transient astrophysics, high energy astrophysics and experimental particle physics.
  • Close-up of the upper arc segment, containing six (complete or partial) images of the galaxy. Astronomers find galaxy revealing its innermost secrets – in 12 copies 2019-11-08 An international group of astronomers, led by Thøger Emil Rivera-Thorsen from the Oskar Klein Centre, have found a distant galaxy which has a rarely seen hole in its interstellar gas, allowing a direct view to the hot, massive stars at its very center. Luckily this galaxy is lensed by a foreground galaxy cluster and the resulting 12 images of the original galaxy can be studied in great detail.
  • A spiral created by two neutron stars that are swirling closer and closer to each other. OKC researchers will use Wallenberg grant to study light from merging neutron stars 2019-10-24 The era of multi-messenger astrophysics has just begun and recently a merging neutron star system has been detected in gravitational waves and subsequently electromagnetically. This grant supports a concentrated research effort across groups at the OKC to study future neutron star merger events from their detection, through simulations and modeling and extending to their electromagnetic follow-up and the use of these events to measure the expansion rate of our Universe.
  • An image of the sky in gamma rays. Gamma ray burst locations on the sky are marked. NASA’s Fermi Mission Reveals its Highest-energy Gamma-ray Bursts 2019-06-15 Gamma-ray bursts are the most powerful explosions known in the Universe, yet we still don’t understand the physics behind their high-energy radiation. An international team, partly led by OKC researcher Magnus Axelsson, has studied nearly 200 events observed over 10 years, the largest sample collected at these energies thus far. The study reveals many new observational findings, it also tells us that there is still a lot we don’t know.
  • Our Milky Way galaxy with known halo streams of stars shown above and below. GD-1 Stellar Stream and Dark Matter in Our Milky Way 2019-06-05 Streams of stars orbiting in the halo of our Milky Way Galaxy can be used to constrain the shape of our Galaxy's dark matter halo and the amount of mass inside the radius of our Sun's orbit.
  • XENON1T installation in the underground hall of Laboratori Nazionali del Gran Sasso. The three story building houses various auxiliary systems. The cryostat containing the LXeTPC is located inside the large water tank next to the building. Photo by Roberto Corrieri and Patrick De Perio.” The extreme of rarity 2019-04-30 OKC researchers helped reveal the rarest nuclear reaction now known to mankind. To observe this ultra-rare process, XENON1T watched a tonne of ultra-pure liquid xenon for a year. The experiment was featured on the cover of the scientific journal 'Nature'
  • Wimpo ion illustration First test of the interaction of dark matter with pions 2019-02-25 Over 80% of the matter content of the universe is made of dark matter. In order to unravel its nature, direct-detection experiments look for the scattering of dark matter particles off atomic nuclei.
  • Artist’s illustration of two merging neutron stars with gamma-ray beams and clouds of ejecta. Merging neutron stars detected in gravitation waves and electromagnetic radiation 2019-02-13 Gravitational waves from the merger of two neutron stars have been detected for the first time. Scientists around the world pinpointed the source to a galaxy 130 million light years away.
  • The Hubble Space Telescope being removed from the space shuttle by its robotic arm. OKC researchers secure HST time in Cycle 26 2018-11-13 Angela Adamo and Matthew Hayes both had successful medium HST proposals in Cycle 26, the most oversubscribed cycle in the history of HST. Angela's observations will explore how dense, young clusters of stars interact with their surroundings. Matthew's observations will look for gas that is thought to envelope galaxies and fuel their future generations of stars.
  • Three panels that show the spiral galaxy before, during, and after the supernova went off near it. Wimpy supernova may signal the birth of a double neutron star system 2018-11-13 The star that died in the supernova likely left behind a binary neutron star system. These dense stellar remnants will ultimately merge with each other, giving off gravitational and electromagnetic waves.
  • Prof. Hiranya Peiris. Photo: Serena Nobili /Oskar Klein Centre Wallenberg Project Grant to OKC Director Hiranya Peiris 2018-10-26 The Knut and Alice Wallenberg Foundation have awarded a project grant of 37.8 million crowns over five years to OKC Director Hiranya Peiris for the project Understanding the Dynamic Universe
  • four images : Dr. Freese, Dr. Carroll, and Dr. Peiris speaking A successful public event for OKC@10 2018-10-23 On Sept 11 the OKC organized a public science event for the Stockholm community. It was held at the Royal College of Music and included a student jazz ensemble, a talk on dark matter by Dr. Katherine Freese and a discussion between Dr. Freese and Dr. Sean Carroll.
  • An design drawing for the instrument - a large container of water surrounded by light detectors The future of neutrino physics is bright with the construction of Hyper-Kamiokande 2018-09-28 A large collaboration of scientists will build a new neutrino detector, known as Hyper-Kamiokande, in Japan. Construction will begin in 2020 and the completed instrument will explore neutrinos from supernovae as well as other unsolved problems in particle physics.
  • XENON1T installation in the underground hall of Laboratori Nazionali del Gran Sasso. The three story building houses various auxiliary systems. The cryostat containing the LXeTPC is located inside the large water tank next to the building. Photo by Roberto Corrieri and Patrick De Perio.” The world's largest dark matter detector, XENON1T, reaches a new level of sensitivity 2018-09-14 The international collaboration, XENON, which includes members of Stockholm University has built the world's most sensitive detector for dark matter. After one year of data collection, the experiment has reached a greater sensitivity than ever before.
  • By User:Rursus (R. J. Hall) [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or CC BY 2.5 (https://creativecommons.org/licenses/by/2.5)], via Wikimedia Commons Massive star explodes in metal-poor galaxy 2018-05-09 This week's issue of Nature Astronomy tells the story of a massive and metal-poor star that exploded as a supernova. It is located in a distant faint galaxy and the authors suggest that it is the low metal content of the host galaxy that allows such a massive star to explode.
  • Sara Strandberg Sara Strandberg Wins the Göran Gustafsson Prize 2018-04-17 The prize is given to Dr. Strandberg for her research in experimental particle physics and and its potential connection to dark matter.
  • Horsehead - Image credit: Caltech Optical Observatories The Zwicky Transient Facility sees “first light”: a new era in the study of the dynamic sky 2017-11-15 The Zwicky Transient Facility is now ready to start operations. A new robotic camera with the ability to capture hundreds of thousands of galaxies in a single shot has taken its first image of the sky. The recently installed camera is part of a new automated sky-survey project based at the Palomar Observatory in California and a revolutionising tool for the study of rapidly varying cosmic phenomena
  • Sara Strandberg Quest for the unknown elementary particle 2017-11-15 Thanks to a 35.2 million SEK grant from the Knut and Alice Wallenberg Foundation, Sara Strandberg and her colleagues can go on the hunt for new particles that could explain the mass of the Higgs boson
  • A graph of the brightness versus time which lasts longer than expected for the supernova iPTF14hls. A strange stellar explosion with enduring brightness 2017-11-15 Located in a dwarf galaxy 500 million light years away, supernova iPTF14hls initially seemed like an ordinary explosion of a red giant star. Then it lasted more than four times longer than a normal supernova.
  • An image of the shiny silver dome of the Nordic Optical Telescope (NOT) during the daytime. The most energetic transient events : supernovae or stars disrupted by black holes? 2017-11-14 A new type of energetic transient has been discovered in the center of active galaxies. There are two potential causes for these events : the explosion of a massive star or the tidal disruption of a star by the galaxy's central, supermassive black hole.
  • Credits: Björn Olin/Folio/imagebank.sweden.se
The cosmoparticle exchange programme 2017-11-13 Welcome to the Cosmoparticle Visitor Exchange Programme, linking London UCL, Ohio CCAPP, New York CCA, Stanford KIPAC, Stockholm OKC and Durham ICC.
  • Frank Wilczek ERC Grant to detect the existence of axions 2017-10-11 Frank Wilczek, professor at the Department of Physics at Stockholm University, has been awarded the ERC Advanced Grant for the theoretical study of axions. Axions are hypothetical particles whose existence would solve the dark matter problem.
  • The Dark Matter WG changes name 2017-05-30

Director

Prof. Hiranya Peiris
hiranya.peiris@fysik.su.se


Deputy Directors

Prof. Garrelt Mellema
garrelt@astro.su.se

Dr. Chad Finley
cfinley@fysik.su.se


Communication manager

Serena Nobili
serena@fysik.su.se

Oskar Klein

Oskar Benjamin Klein

was born in Stockholm the 15th of September 1894.  He is the greatest Swedish theoretical physicist of the 20th century, and also an International authority on quantum  mechanics in his time but even more recognised after his death for his pioneering work in several fields. Oskar Klein studied very fundamental theoretical questions.