We meet every Monday at 1.30pm to discuss the new developments in the fields of research relevant for GRAPPA members and affiliates. The idea is to discuss briefly, with the help of a projector, the results of ~5 interesting papers recently appeared on the arXiv, or anywhere else. Please choose one posted e.g. this week in your field and tell us about it in 5-10 minutes. Feel free to join us even if you haven't read anything.

Sunday, December 14, 2014

Monday, December 15, 2014

  • The X-ray flux distribution of Sagittarius*A as seen by Chandra, Neilsen et al. http://arxiv.org/abs/1412.3106 [Sera]
  • The Local group galaxies emerge from the dark, Sawala et al. http://arxiv.org/abs/1412.2748 [Nassim]
  • An ultimate target for dark matter searches, Blum et al. http://arxiv.org/abs/1412.3463 [Richard]

Monday, December 8, 2014

Monday, Dec 8

Sunday, November 30, 2014

Monday, December 1, 2014

  • Diffuse galactic gamma-ray emission with H.E.S.S., H.E.S.S. Collaboration, http://arxiv.org/abs/1411.7568 [David] + http://arxiv.org/abs/1411.7985v1
  • A possible indication of momentum-dependent asymmetric dark matter in the Sun, Vincent, Scott and Serenelli, http://arxiv.org/abs/1411.6626 [Hamish]
  • The gamma-ray sky points to radial gradients in cosmic-ray transport, Gaggero, Urbano, Valli and Ullio, http://arxiv.org/abs/1411.7623 [Francesca]

Monday, November 24, 2014

Monday, Nov 26

Sunday, November 16, 2014

Monday, November 17, 2014

Monday, November 10, 2014

Monday, Nov 10

Sunday, November 2, 2014

Monday, November 3, 2014
  • Moduli-induced Baryogenesis by Kohji Ishiwata (DESY/Hamburg)
  • First Results from the DarkSide-50 Dark Matter Experiment at
    Laboratori Nazionali del Gran Sasso
     http://arxiv.org/abs/1410.0653
    [Sander Breur]
  • An update from the Fifth Fermi Symposium 2014  https://www.dropbox.com/s/ubbcqvikkn1h10g/18_Charles_short.pdf?dl=0 [Francesca]

Monday, October 27, 2014

Monday, October 27, 2014
  • Are we really seeing dark matter signals from the Milky Way center? http://arxiv.org/abs/arXiv:1410.2376 [Roberta]
  • Clustering of gamma-ray selected 2LAC Fermi Blazars http://arxiv.org/abs/1410.0358 [Shin'ichiro]
  • The same with less: The cosmic web of warm versus cold dark matter dwarf galaxies http://arxiv.org/abs/1410.1541 [Mark]
  • Observational appearance of inefficient accretion flows and jets in 3D GRMHD simulations: Application to Sgr~A* http://lanl.arxiv.org/abs/1408.4743 [Sera]
  • An update from the Fifth Fermi Symposium 2014 [Francesca]

Sunday, October 19, 2014

Monday, October 20, 2014


  • Indirect Probes of Dark Matter and Globular Cluster Properties From Dark Matter Annihilation within the Coolest White Dwarfs, http://arxiv.org/pdf/1410.3925.pdf  [Hamish]

Monday, October 13, 2014



    Monday, October 13, 2014

    • Atmospheric and Astrophysical Neutrinos above 1 TeV Interacting in IceCube, http://arxiv.org/abs/1410.1749 [Irene]
    • Search for dark matter annihilation signatures in H.E.S.S. observations of Dwarf Spheroidal Galaxies, http://arxiv.org/abs/1410.2589 [Francesca]

    Sunday, October 5, 2014

    Monday, October 6

    Monday, June 16, 2014

    Monday, June 16

    Sunday, June 1, 2014

    Monday, June 2, 2014


    • GRAPPA Club Blackboard talk: "Does gravity crush everything?" [I-Sheng]

    Sunday, May 25, 2014

    Monday, May 26, 2014


    • The Intrinsic Two-Dimensional Size of Sagittarius A*, G.C. Bower et al.http://arxiv.org/abs/arXiv:1405.1456 [Sera]
    • A joint analysis of Plank and BICEP2 B modes including dust polarization uncertainty, M. Mortonson and U. Seljakhttp://arxiv.org/abs/arXiv:1405.5857 [Ben]
    • A photon-photon collider in a vacuum hohlraum, O.J. Pike et al., http://www.nature.com/nphoton/journal/vaop/ncurrent/full/nphoton.2014.95.html [Michael]

    • GRAPPA Club Blackboard talk: "The statistics behind our predicted dark matter limits for CTA" [Hamish]

    Sunday, May 18, 2014

    Monday, May 19, 2014


    • Searching for Dark Matter Annihilation in the Smith High-Velocity Cloud. Drlica-Wagner et al., http://arxiv.org/abs/1405.1030 [Francesca]

    Sunday, May 11, 2014

    Monday, May 12, 2014

    • Properties of galaxies reproduced by a hydrodynamic simulation. Vogelsberger et al., http://arxiv.org/abs/1405.1418 [Mark]
    • Effect of Gravitational Focusing on Annual Modulation in Dark-Matter Direct-Detection Experiments. Lee et al.,  http://arxiv.org/abs/1308.1953 [Sofia]
    • Searching for Dark Matter Annihilation in the Smith High-Velocity Cloud. Drlica-Wagner et al., http://arxiv.org/abs/1405.1030 [Francesca]

    Monday, April 28, 2014

    Monday, April 28

    • On the flavor composition of the high-energy neutrino events in IceCube, Olga Mena, Sergio Palomares-Ruiz, Aaron C. Vincent, http://arxiv.org/abs/1404.0017 [Roberta]
    • Galactic PeV neutrinos from dark matter annihilation,Jesus Zavala, http://arxiv.org/abs/1404.2932 [Roberta]
    • Bounds on Dark Matter Interpretation of Fermi-LAT GeV Excess,Kyoungchul Kong, Jong-Chul Park, http://arxiv.org/abs/1404.3741 [Christoph]
    • Cross-Correlation of Cosmic Shear and Extragalactic Gamma-ray Background: Constraints on the Dark Matter Annihilation Cross-Section, Masato Shirasaki, Shunsaku Horiuchi, Naoki Yoshida, http://arxiv.org/abs/1404.5503 [Shin'ichiro]
    • Too Big to Fail in the Local Group, Shea Garrison-Kimmel, Michael Boylan-Kolchin, James S. Bullock, Evan N. Kirby, http://arxiv.org/abs/1404.5313 [Mark]

    Monday, April 14, 2014

    Monday, April 14, 2014


    • Cosmic neutrino cascades from secret neutrino interactions, K.C.Y. Ng, J.F. Beacom http://arxiv.org/pdf/1404.2288v1.pdf [Shin'ichiro]
    • Star-forming galaxies as the origin of diffuse high-energy backgrounds: Gamma-ray and neutrino connections, and implications for starburst history, I. Tamborra, S. Ando, K. Murase, http://arxiv.org/pdf/1404.1189.pdf [Irene]

    Sunday, April 6, 2014

    Monday, April 7, 2014

    • $\phi^2$ or not $\phi^2$ Checking the Simplest Universe, Paolo Creminelli, Diana Lopez Nacir, Marko Simonovic, Gabriele Trevisan,  and Matias Zaldarriaga. http://arxiv.org/abs/1404.1065 [Ben]
    • Thermal dark matter implies new physics not far above the weak scale. http://arxiv.org/abs/1403.5829 [Francesca]

    Sunday, March 23, 2014

    Monday, March 24, 2014

    Friday, March 14, 2014

    Monday, March 17


    • We will discuss - and vote! - for the GRAPPA logo
    • Jan Pieter van der Schaar will tell us all we need to know about CMB polarization, B-modes, and the implications for inflationary scenarios
    • Don't forget to print your own BICEP2 Bingo Cards

    Monday, March 10, 2014

    Monday, March 10

    Sunday, February 23, 2014

    Monday, February 24

    Sunday, February 16, 2014

    Monday, February 17

    Sunday, February 9, 2014

    Monday, February 10

    Sunday, February 2, 2014

    Monday, February 3

    Monday, January 27, 2014

    Monday, January 27

    Sunday, January 19, 2014

    Monday, January 20

    Sunday, January 12, 2014

    Monday, January 13