Prof.
Ben Moore
(University of Zurich)
14/06/2011, 11:30
I will review the most recent results from supercomputer simulations that follow the assembly of dark matter haloes and baryons. I will also address the question of future research directions and if there is anything left that simulations can contribute to the areas of direct and indirect dark matter detection.
Prof.
Simon White
(Max Planck Institute for Astrophysics)
14/06/2011, 12:15
I will discuss the fine-scale structure expected in the dark matter distribution at the position of the Sun (and thus relevant for direct detection experiments) using numerical simulations with effective mass resolution exceeding that of previous simulations used to address this issue by more than 10 orders of magnitude. The local
distribution should be a superposition of a very large number...
Pat Scott
(McGill University)
14/06/2011, 14:30
Events like inflation and phase transitions in the Early Universe could have introduced large density perturbations on very small scales. Such power at large wave-numbers is not constrained by standard probes of the primordial power spectrum like the CMB; existing limits come only from primordial black holes (PBHs). Any additional probe of such small scales would be exceptionally useful in...
Dr
Celine Combet
(University of Leicester)
14/06/2011, 14:45
The nature of dark matter still evades us. In this talk, I will focus on the gamma-ray flux from dark matter annihilation, which has been tagged as a promising channel for indirect detection. I will present the results of a recent study where we revisited the question of the detectability of such a signal in the classical dwarf spheroidal galaxies of the Milky Way. This work is based on a MCMC...
Dr
Nicolás Bernal
(Uni Bonn)
14/06/2011, 15:00
We study the abilities of the Fermi-LAT instrument on board of the Fermi mission to simultaneously constrain the Milky Way dark matter density profile and some dark matter particle properties, as annihilation cross section, mass and branching ratio into dominant annihilation channels. A single dark matter density profile is commonly assumed to determine the capabilities of gamma-ray...
Dr
Andy Strong
(MPE Garching)
15/06/2011, 10:15
Cosmic-ray origin and propagation can studied using a broad range of experimental data. These include direct measurements from balloons and satellites, gamma rays, synchrotron radiation, ionization in molecular clouds, and so on. It is important that a consistent framework be used for such studies, since all the data relate to the same Milky Way galaxy. Since the mid-1990s the GALPROP project...
Dr
Fiorenza Donato
(Torino University)
15/06/2011, 11:30
Positrons in cosmic rays have been measured by the Pamela satellite and more recently by the Fermi-LAT instrument. Their ratio to electrons increases with energy, indicating the presence of a primary source in the Galaxy. We investigate the possibility that their source resides in Dark Matter particles and discuss the possible astrophysical sources and backgrounds.
Dr
Antje Putze
(The Oskar Klein Centre for Cosmoparticle Physics (Stockholm University))
15/06/2011, 14:30
We implemented a Markov Chain Monte Carlo (MCMC) technique within the USINE propagation package to estimate the probability-density functions for cosmic-ray transport and source parameters within an 1D diffusion model. From the measurement of the B/C ratio and radioactive cosmic-ray clocks, we calculate their probability density functions, with a special emphasis on the halo size L of the...
Miguel Pato
(ITP Zurich / Univ Padova / IAP Paris)
15/06/2011, 14:45
We study the prospects for discriminating between the dark matter (DM) and pulsar origin of the PAMELA positron excess with the Alpha Magnetic Spectrometer AMS-02. We simulate the response of AMS-02 to positrons (and electrons) originating from DM annihilations, and determine the pulsar parameters (spin-down luminosity, distance and characteristic age) that produce a satisfactory fit to the...
Dr
Enrico Borriello
(Università degli Studi di Napoli "Federico II")
15/06/2011, 15:00
Indirect searches of particle Dark Matter (DM) with high energy Cosmic Rays (CR) are affected by large uncertainties, coming both from the DM side, and from poor understanding of the astrophysical backgrounds. We show that, on the contrary, the DM intrinsic degree of anisotropy in the arrival directions of high energy CR electrons and positrons does not suffer from these unknowns. Furthermore,...
Prof.
Pyungwon Ko
(Korea Inst for Advanced Study (KIAS))
15/06/2011, 15:15
Recent data on $e^+/e^-$ and $\bar{p}$ cosmic rays suggest that dark matter annihilate into the standard model (SM) particles through new leptophilic interaction. In this talk, I consider a standard model extension with the gauged $U(1)_{L_\mu - L_\tau}$ group, with a new Dirac fermion charged under this U(1) as a dark matter. We study the muon $(g-2)_\mu$, thermal relic density of the cold...
Prof.
Joakim Edsjö
(Department of Physics and the Oskar Klein Centre, Stockholm University)
16/06/2011, 12:15
Dark matter is searched for in many different ways and neutrinos from the Sun, the Earth or the galactic centre can be a promising route. In this talk I will go through the predictions of neutrino fluxes from dark matter from these sources and compare with the recent experimental constraints. I will also compare with other ways to search for dark matter.
Dr
Joachim Ripken
(Stockholm university)
16/06/2011, 14:45
One possible indirect messenger for dark matter are VHE photons, which are produced secondary or rarely primary in dark matter self annihilation or decay processes. Since the spectrum of this radiation in general is strongly dependent on the dark matter model, generic assumptions generic DM spectra, though often used, are not optimal in assessing the question what the nature of dark matter is....
Ms
Francesca Calore
(University of Hamburg)
16/06/2011, 15:15
Gamma rays from the annihilation of dark matter particles in the Galactic
halo provide a particularly promising means of indirectly detecting dark
matter. Here, we demonstrate that pronounced spectral features near the
kinematic cutoff at the dark matter particles' mass, which is a generic
prediction for most models, can significantly improve the sensitivity of
gamma-ray telescopes to...
Roberto Iengo
17/06/2011, 09:30
We present a review of the Sommerfeld enhancement in the generic case of many channels and different spin configurations. We also present results for a relic density computation including the enhancement.
Finally we discuss the radiative corrections to the Sommerfeld effect.
Dr
Björn Herrmann
(DESY)
17/06/2011, 12:15
Calculating the relic density of dark matter and comparing to current cosmological data is a powerful tool to constrain the parameter space of new physics and to obtain complementary information with respect to collider and precision data. However, this calculation is affected by several uncertainties. On the particle physics side, this concerns the calculation of the annihilation...
Dr
Christoph Weniger
(MPI for Physics, Munich)
17/06/2011, 14:45
If dark matter particles are not perfectly stable, their decay products could be seen in the cosmic-ray fluxes. A natural candidate for decaying dark matter is the gravitino in R-parity violating scenarios. In the relevant GeV-TeV energy range, the Fermi Large Area Telescope (LAT) is now measuring cosmic gamma-ray fluxes with an unprecedented precision. We use the public gamma-ray data to...
Dr
Mathias Garny
(Technical University Munich)
17/06/2011, 15:00
The decay of dark matter particles which are coupled predominantly to charged leptons has been proposed as a possible origin of excess high-energy positrons and electrons observed by cosmic-ray telescopes PAMELA and Fermi LAT. Even though the dark matter itself is electrically neutral, the tree-level decay of dark matter into charged lepton pairs will generically induce radiative two-body...
Mr
Stefan Vogl
(Technische Universitaet Muenchen)
17/06/2011, 15:15
It is well known that the annihilation of Majorana dark matter particles into
light leptons can be significantly enhanced by electromagnetic bremsstrahlung processes, which give rise to potentially observable signal in gamma-rays.
Due to the gauge invariance, this mechanism inevitably leads to electroweak
bremsstrahlung processes, which in turn lead to the production of antiprotons even...
