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  • 1.
    Bergström, Lars
    Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Physics.
    Cosmology and the dark matter frontier2013In: Physica scripta. T, ISSN 0281-1847, Vol. T158, no Art.nr., p. UNSP 014014-Article in journal (Refereed)
    Abstract [en]

    A brief overview is given about some issues in current astroparticle physics, focusing on the dark matter (DM) problem, where the connection to Large Hadron Collider (LHC) physics is particularly strong . New data from the Planck satellite has made the evidence in favour of the existence of DM even stronger. The favourite, though not the only, candidates for cosmological DM, weakly interacting massive particles, are being probed by a variety of experiments—direct detection through scattering in terrestrial detectors, indirect detection by observing products of annihilation of DM in the Galaxy and finally searches at accelerators such as the LHC. The field is in the interesting situation that all of these search methods are reaching sensitivities where signals of DM may plausibly soon be found, and a vast array of models will be probed in the next few years. Of course, expectations for a positive signature are high, which calls for caution regarding ‘false alarms’. Some of the presently puzzling and partly conflicting pieces of evidence for DM detection are discussed as well as expectations for the future.

  • 2.
    Lundin, Peter
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Gurell, Jonas
    Stockholm University, Faculty of Science, Department of Physics.
    Mannervik, Sven
    Stockholm University, Faculty of Science, Department of Physics.
    Royen, Peder
    Stockholm University, Faculty of Science, Department of Physics.
    Norlin, Lars-Olov
    Hartman, Henrik
    Hibbert, Alan
    Metastable levels in ScII: Lifetime measurements and calculations2008In: Physica scripta. T, ISSN 0281-1847, Vol. 78, no 1, p. 015301-Article in journal (Refereed)
    Abstract [en]

    The lifetime of the metastable level 3d2 1G4 in a singly charged scandium has been experimentally investigated at the ion storage ring CRYRING. A laser probing technique has been used for the studies. We also report calculated lifetimes and transition rates for 10 metastable levels in Sc II, including the 3d2 1G4 state, by calculations using configuration interaction wave functions. The lifetime of the 1G4 level is experimentally determined to be τexp=2.64±0.18 s and is in good agreement with the theoretical calculation τth=2.84 s.

  • 3. Niemi, Antti
    et al.
    Wilczek, Frank
    Ardonne, Eddy
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
    Hansson, Hans Thors
    Stockholm University, Faculty of Science, Department of Physics.
    Nobel Symposium 148: Graphene and quantum matter2012In: Physica scripta. T, ISSN 0281-1847, no T146, article id 010101Article in journal (Other academic)
    Abstract [en]

    The 2010 Nobel Symposium on Graphene and Quantum Matter, was held at the Grand Hotel in Saltsjöbaden south of Stockholm on 27-31 May. The main theme of the meeting was graphene, and the symposium turned out to be very timely: two of the participants, Andre Geim and Kanstantin Novoselov returned to Stockholm less then six months later to receive the 2010 Nobel Prize in Physics. In these proceedings leading experts give up-to-date, historical, experimental, theoretical and technological perspectives on the remarkable material graphene, and several papers also make connections to other states of quantum matter. Saltsjöbaden is beautifully situated in the inner archipelago of Stockholm. It provided a pleasant setting for the talks and the ensuing discussions that took place in an enthusiastic and friendly atmosphere. The social programme included a boat trip in the light summer night and a dinner at the renowned Grand Hotel. These proceedings are ordered thematically, starting with historical overviews, followed by first experimental and then theoretical papers on the physics of graphene. Next are several papers addressing more general topics in quantum matter and finally contributions on the technological applications of graphene. We hope that this volume will serve as a source of knowledge and inspiration for any physicist interested in graphene, and at the same time provide a snapshot of a young field of research that is developing at very high speed. We are grateful to Marja Fahlander for excellent administrative support, and to the Nobel Foundation who funded the symposium.

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