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29/08/2016, 15:00
Dark matter, where do we stand?
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29/08/2016, 15:30
An accurate determination of the local dark matter (DM) density is crucial to interpreting data from direct detection and certain indirect detection experiments, as it is degenerate with the DM-nucleon interaction strength. Here I give an update to our ongoing project to make a determination of the local DM density. Our method uses the positions and velocities of a set of tracer stars...
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29/08/2016, 16:00
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29/08/2016, 17:00
I will present a brief review of techniques to extract the radial profiles of total mass, from which one can infer the dark matter (DM) profile and of velocity anisotropy, related to orbital shapes and formation history of structures. This will allow me to compare the shapes of the anisotropy profiles of elliptical, S0 and spiral galaxies in clusters. I will show how accurate is our knowledge...
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Andrea Chiappo (oskar klein center, stockholm university)29/08/2016, 17:30
Dwarf spheroidal satellite galaxies (dSphs) of the Milky Way appear to
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be the most dark matter (DM) dominated objects in the near Universe.
Their proximity coupled with their low astrophysical background make
them ideal targets for DM indirect detection, which can be achieved by
searching for DM decay or annihilation into, e.g., γ-rays. The latter
approach requires the calculation of the... -
29/08/2016, 18:00
Over the summer Fermi LAT will publish a new measurement of the angular power spectrum of anisotropies in the diffuse gamma-ray emission. The new data indicate the detection of significant Poissonian angular power over the energy range between 0.5 and 500 GeV. Such an observable provides valuable insight on the nature of the Diffuse Gamma-Ray Background (DGRB), i.e. the radiation produced by...
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29/08/2016, 18:30
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30/08/2016, 09:00
Bound states of symmetric and asymmetric dark matter
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Daniele Gaggero30/08/2016, 09:30
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Joakim Edsjo (Stockholm University)30/08/2016, 09:50
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30/08/2016, 10:10
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30/08/2016, 11:00
A hardening of the proton and helium fluxes is observed above a few hundreds of GeV/nuc. The actual distribution of the local sources of primary cosmic rays has been suggested as a potential solution to this puzzling behavior. Some authors even claim that a single source is responsible for the proton and helium anomalies. But how probable are such explanations ? To answer that question, I will...
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30/08/2016, 11:30
Cosmic Ray Antiprotons at High Energies
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30/08/2016, 12:00
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30/08/2016, 14:00
Fermi-LAT observations have discovered a gamma-ray excess emanating from the Galactic center of the Milky Way. While the existence of this excess is now certain, its origin is not. Three distinct classes of models have been posited to explain its key features: dark matter annihilation, a population of sub-threshold gamma-ray pulsars, and diffuse emission from the intense Galactic center...
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30/08/2016, 14:30
The nature of the Galactic diffuse gamma-ray emission as measured by the Fermi Gamma-ray Space Telescope has remained an active area of research for the last several years. In particular, the discovery of a GeV excess towards the Galactic center has generated enormous interest in trying to understand its origins, whether astrophysical or more exotic. While most analyses of the GeV excess...
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30/08/2016, 15:00
The Fermi-LAT has provided an unprecedented view of the gamma-ray sky and in particular has found a host of previously unknown point sources, i.e. the 3FGL. Of the 3033 objects in the 3FGL, 1010 remain unassociated to a particular source class. Additionally, the origin of the GeV-scale excess emission towards the galactic centre remains unknown. Recent statistical studies have shown that the...
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31/08/2016, 09:00
PBH, DM and more
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31/08/2016, 09:30
The past two decades have seen a rapid development of $\gamma$-ray astronomy, in particular at energies above a few hundred MeV where Fermi-LAT has revolutionised the field. As a result, extensive studies have been undertaken to characterise gamma-ray annihilation spectra of dark matter with masses above ~1 GeV. However, due to the lacking sensitivity of current experiments at lower energies,...
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31/08/2016, 10:00
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31/08/2016, 11:00
Direct detection experiments aim to detect the interaction of Galactic Dark Matter (DM) with terrestrial nuclei. But many of these DM particles will pass through the Earth before reaching the detector. During this transit, they may interact and scatter, altering their distribution at the Earth's surface. I will sketch the first fully self-consistent calculation of this ‘Earth-Shadowing’...
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31/08/2016, 11:30
This talk will discuss results from "Supernova neutrino physics with xenon dark matter detectors: A timely perspective", arXiv:1606.09243. Work in collaboration with Rafael Lang, Shayne Reichard, Marco Selvi and Irene Tamborra.
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31/08/2016, 12:00
When cosmic rays hit the sun high energy neutrinos, along with many other particles, are produced as a result of a chain of interactions and decays in a process similar to how particles are produced in the Earth's atmosphere. The high energy neutrinos produced in such a fashion will propagate and oscillate from the Sun to the Earth and can in principle be detected by modern neutrino detectors...
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