Conveners
Dark Matter: Indirect Detection: Gammas and the GC Excess
- Tracy Slatyer (MIT)
Dark Matter: Indirect Detection: Dark Matter: Indirect Detection
- Gabrijela Zaharijas (CEA Saclay)
Dark Matter: Indirect Detection: Charged Antiparticles
- dan hooper (fermilab)
Dark Matter: Indirect Detection: Neutrinos
- Arman Esmaili Taklimi
Dark Matter: Indirect Detection: Neutrinos, Radio and 'Cosmology'
- Laura Lopez-Honorez (VUB)
Dark Matter: Indirect Detection: Future Gamma and Model bdg
- Oleg Ruchayskiy (Ecole Polytechnique Federale de Lausanne (CH))
Dr
Gabrijela Zaharijas
(ICTP and INFN, Trieste)
23/06/2014, 14:30
Dark Matter Indirect Detection
Presentation
High-energy gamma rays are one of the most promising ways to constrain or reveal the nature of dark matter. Through the first five years of the Fermi-LAT mission we have witnessed an exciting progress in this respect, with constraints on the dark matter cross section to various particle channels moving well into the theoretically motivated region of the parameter space and several hints of...
Mr
Stephan Zimmer
(OKC/ Stockholm University)
23/06/2014, 14:55
Dark Matter Indirect Detection
Presentation
Galaxy Clusters are the largest gravitationally bound structures in our universe. The majority of their mass is believed to be in the form of dark matter (DM). If DM manifests itself as weakly interacting massive particles (WIMPs) these WIMPs may self-annihilate or decay, and galaxy clusters would then be excellent targets for searches of DM-induced gamma rays. In addition, N-body cosmological...
Javier Rico
(IFAE)
23/06/2014, 15:05
Dark Matter Indirect Detection
Presentation
Determining the nature of dark matter (DM) is one of the most exciting tasks of modern science. In most of the suggested hypothesis, DM particles should annihilate or decay into standard matter, which would produce high energy gamma-ray signal. The MAGIC telescopes search for such a DM signature in the 50 GeV - 50 TeV energy range. Suitable targets are the Galactic centre, local DM clumps,...
Dr
dan hooper
(fermilab)
23/06/2014, 15:30
Dark Matter Indirect Detection
Presentation
A spatially extended excess of ~1-3 GeV gamma rays from the region surrounding the Galactic Center has been observed, consistent with the emission expected from annihilating dark matter. Recent improvements in analysis techniques have found this excess to be robust and highly statistically significant, with a spectrum, angular distribution, and overall normalization that is in good agreement...
Samuel McDermott
23/06/2014, 15:45
Dark Matter Indirect Detection
Presentation
We are interested in exhausting the list of possible minimal models that could produce the galactic center gamma-ray excess at tree level, without adopting the simplifications inherent in the effective operator approach. We wish to take a holistic but general view of the types of interactions that could produce the galactic center gamma-ray excess. This leads us to the simplified model...
Laura Lopez Honorez
(Vrije Universiteit Brussel)
23/06/2014, 16:30
Dark Matter Indirect Detection
Presentation
In my talk I will review the most recent cosmological constraints on dark matter annihilation with a special focus on CMB probes.
Prof.
Tracy Slatyer
(MIT)
23/06/2014, 16:50
Dark Matter Indirect Detection
Presentation
Discrepancies between N-body dark matter simulations and the observed distribution of dark matter on galactic and sub-galactic scales have been advanced as evidence of a complex dark sector. Dark matter self-interactions can flatten density cusps and reduce halo concentrations, and the down-scattering of a relic population of dark matter particles in a nearly-degenerate excited state could...
Dr
Alfredo Urbano
(SISSA)
23/06/2014, 17:10
Dark Matter Indirect Detection
Presentation
The quest for Dark Matter signals in the gamma-ray sky is one of the most intriguing and exciting challenges in astrophysics. In this talk I will discuss the energy spectrum of the Fermi bubbles at different latitudes, making use of the gamma-ray data collected by the Fermi Large Area Telescope. At high latitude, $|b|=20^{\circ}-50^{\circ}$, the Fermi bubbles energy spectrum can be reproduced...
Alessandro Cuoco
(U)
23/06/2014, 17:35
Dark Matter Indirect Detection
Presentation
I will describe the current status of the measurement of the Extra-Galactic Gamma-ray Background (EGB) anisotropy (its angular power spectrum) and correlations with galaxy catalogues (cross-correlation functions) derived using data from the Fermi-LAT gamma-ray observatory. I will then discuss the implications for the origin of the EGB, in particular in relation to the presence of a possible...
Ilias Cholis
(Fermi National Accelerator Laboratory)
23/06/2014, 18:00
Dark Matter Indirect Detection
Presentation
The approximately isotropic gamma-ray background measured by Fermi-LAT probes the contribution from several classes of astrophysical sources. Using the catalog of known gamma-ray sources along with similar catalogues at radio wavelengths, we can model and constrain the contributions to the extragalactic gamma-ray background from astrophysical sources, as are radio galaxies, star-forming...
Nicolas Bernal
23/06/2014, 18:15
Dark Matter Indirect Detection
Presentation
We study the impact of aspherical dark matter density distribution in Milky-Way like halo on direct and indirect searches. Using data from large N-body cosmological simulation Bolshoi, we perform a complete statistical analysis and quantify the systematic uncertainties that affect the determination of local dark matter density and $J$ factors for annihilating and decaying dark matter. We find...
Tsuguo Aramaki
(C)
24/06/2014, 14:30
Dark Matter Indirect Detection
Presentation
The general antiparticle spectrometer (GAPS) experiment is a proposed indirect dark matter search focusing on antiparticles produced by WIMP (weakly interacting massive particle) annihilation and decay in the Galactic halo. Since antideuteron signals at low energy are free of background, GAPS has a strong capability to observe dark matter signatures through the antideuteron search. In...
Andrea Vittino
(Universita' di Torino and IPhT/CEA Saclay)
24/06/2014, 14:55
Dark Matter Indirect Detection
Presentation
Light anti-nuclei, namely anti-deuteron and anti-helium, can be produced through the nuclear coalescence of the anti-protons and the anti-neutrons that are originated in a dark matter pair annihilation event. At low kinetic energies, the fluxes of these bound states are found to dominate over the astrophysical background and thus anti-nuclei may be considered as a very promising channel for a...
Dr
Holger Motz
(Waseda University)
24/06/2014, 15:20
Dark Matter Indirect Detection
Presentation
The Calorimetric Electron Telescope (CALET) will be installed at the ISS in JFY 2014 and measure the energy and direction distribution of electron/positron cosmic rays well into the TeV range. Featuring a proton rejection capability of $1:10^5$ and an energy resolution of 2$\%$, it is well suited to investigate features in the spectrum, testing the hypotheses of Dark Matter annihilation and/or...
Carmelo Evoli
(Hamburg University)
24/06/2014, 15:35
Dark Matter Indirect Detection
Presentation
The latest years have seen steady progresses in weakly interacting massive particle (WIMP) dark matter (DM) searches, with hints of possible signals suggested both in direct and indirect detection. Cosmic-ray (CR) antiprotons play a key role in this context, since WIMP annihilations can be a copious source of antiprotons, and, at the same time, the antiproton flux from conventional...
Anna Lamperstorfer
(TUM)
24/06/2014, 15:50
Dark Matter Indirect Detection
Presentation
We use the new positron data from the AMS-02 experiment to set limits on dark matter annihilations and decays in different channels. In this work it is assumed that the positron background consists of secondary positrons from spallations and an additional primary component of astrophysical origin. We show that the positron flux and the positron fraction give competitive limits on the dark...
Carsten Rott
(Sungkyunkwan University)
24/06/2014, 16:30
Dark Matter Indirect Detection
Presentation
Dark matter particles captured by the Sun through scattering may annihilate and produce neutrinos, which escape. Current searches have focused on the high-energy neutrino signal produced in the prompt decays of some final states. Interactions of hadronic annihilation products lead to other interesting final states with potentially observable neutrino signals. The talk will discuss the...
Martin Bissok
(RWTH Aachen)
24/06/2014, 16:50
Dark Matter Indirect Detection
Presentation
Dark matter may self-annihilate, and produce a flux of final-state particles,
including neutrinos. Indirect dark matter searches target regions of increased
dark matter density, and thus increased expected flux, with the Galactic center
being the most prominent target region in the Milky Way.
IceCube is a cubic-kilometer-scale neutrino detector embedded in glacial ice at
the South Pole....
Meike de With
(Humboldt University, Berlin)
24/06/2014, 17:00
Dark Matter Indirect Detection
Presentation
In many models, the self-annihilation of dark matter particles will create neutrinos which can be detected on Earth. An excess flux of these neutrinos is expected from regions of increased dark matter density, for example galaxies and galaxy clusters. The IceCube neutrino observatory, a cubic-kilometer neutrino detector at the South Pole, is capable of detecting neutrinos down to energies of...
Mr
Jan Kunnen
(Vrije Universiteit Brussel)
24/06/2014, 17:10
Dark Matter Indirect Detection
Presentation
Many models predict that dark matter consists of Weakly Interacting Massive Particles (WIMPs).
Heavy celestial bodies, such as the Earth, might capture these WIMPs, accumulate them in their gravitational centre and over time these dark matter particles will self-annihilate. These annihilations may produce standard model particles, including neutrinos.
Large scale neutrino telescopes, such...
Christoph Tönnis
(Universitat de Valencia)
24/06/2014, 17:20
Dark Matter Indirect Detection
Presentation
One of the main goals of neutrino telescopes is the indirect search for dark matter. The ANTARES detector, installed in the Mediterranean Sea, has been taken data since 2007. In this talk we present the results on different dark matter potential sources, including the Sun, the Galactic Center, the Earth, dwarf galaxies and galaxy clusters produced with different analysis methods and will show...
Mr
Sebastian Wild
(Technical University Munich)
24/06/2014, 17:35
Dark Matter Indirect Detection
Presentation
Dark matter particles captured in the Sun would annihilate producing a neutrino flux that could be detected at the Earth. In some channels, however, the neutrino flux lies in the MeV range and is thus undetectable at IceCube, namely when the dark matter particles annihilate into electrons, muons or light quarks. In this talk we show that the same interaction that mediates the annihilations...
Denis Robertson
(Instituto de Fisica, Universidade de Sao Paulo)
24/06/2014, 18:00
Dark Matter Indirect Detection
Presentation
If dark matter particles self-interact, their capture by astrophysical objects should be enhanced. As a consequence, the rate by which they annihilate at the center of the object will increase. If their self scattering is strong, it can be observed indirectly through an enhancement of the flux of their annihilation products. Here we investigate the effect of self-interaction on the neutrino...
Dr
Jordi Casanellas
(Max Planck Institute for Gravitational Physics (Albert Einstein Institute))
24/06/2014, 18:15
Dark Matter Indirect Detection
Presentation
Low-mass asymmetric dark matter (DM) particles are appealing DM candidates that are not detectable with most indirect DM searches. However, these particles may efficiently accumulate in the core of low-mass stars, reducing their central temperatures and inhibiting the formation of small convective cores in 1.1-1.3 M$_{\odot}$ stars, thus leaving a characteristic signature in the low-degree...
Arman Esmaili Taklimi
25/06/2014, 14:30
Dark Matter Indirect Detection
Presentation
Recent observations by IceCube, notably two PeV cascades accompanied by events at energies $\sim (30-400)$ TeV, are clearly in excess over atmospheric background fluxes and beg for an astroparticle physics explanation. In this talk I will discuss the possibility to interpret the IceCube data by PeV mass scale decaying Dark Matter. I discuss generic signatures of this scenario, including its...
Dr
Marco Regis
(University of Turin and INFN)
25/06/2014, 14:55
Dark Matter Indirect Detection
Presentation
Annihilations or decays of WIMPs in dark-matter (DM) halos can produce high-energy electrons and positrons, which in turn give raise to synchrotron radiation via their interaction with the interstellar magnetic field.
The emission typically peaks in the radio band, which is thus a promising range of photon wavelengths for indirect DM searches.
I will discuss recent results in the search for...
Dr
Michael Loewenstein
(University of Maryland/CRESST/NASA-GSFC)
25/06/2014, 15:20
Dark Matter Indirect Detection
Presentation
After briefly summarizing previous constraints on dark
matter candidates that produce X-ray emission lines via radiative
decay, with an emphasis on the sterile neutrino and moduli dark
matter, I present the recent detection by our team of a candidate dark
matter feature at ~3.56 keV. This weak unidentified emission line was
discovered by stacking XMM-Newton spectrum of 73 galaxy clusters...
25/06/2014, 15:40
Dark Matter Indirect Detection
Presentation
Recently two groups have reported an unidentified line-like feature in the
X-ray spectra of dark matter-dominated objects (galaxies and galaxy
clusters) [Bulbul et al.][1] and [Boyarsky et al.][2]. We discuss the signal and consistency of its interpretation in
terms of dark matter decay.
[1]: http://arxiv.org/abs/1402.2301
[2]: http://arxiv.org/abs/1402.4119
Dr
Christian Farnier
(Oskar Klein Centre, Stockholm University)
25/06/2014, 16:30
Dark Matter Indirect Detection
Presentation
Dark matter searches with the Cherenkov Telescope Array
Christian Farnier (Oskar Klein Centre - Stokckholm University) for the CTA Consortium
The current paradigm of the Universe states that more than 80% of its mass content consists of dark matter of unknown origin. Since its discovery more than eighty years ago, the quest for dark matter identification is one of the most important...
Mr
Paolo Cumani
(University of Trieste / INFN Trieste)
25/06/2014, 16:55
Dark Matter Indirect Detection
Presentation
GAMMA-400 is a Russian space mission with an international contribution, primarily devoted to the study of gamma-rays in the MeV – TeV energy range. One of the main topic addressed by GAMMA-400 will be the search of possible hint of Dark Matter signal with observation firstly towards the Galactic Center and Dwarf Galaxies. Thanks to a deep calorimeter of novel concept and a state-of-the-art...
Hamish Silverwood
(University of Amsterdam)
25/06/2014, 17:20
Dark Matter Indirect Detection
Presentation
The nature of Dark Matter (DM) is a pressing question, and can be investigated through the detection of gamma rays produced by annihilating DM. The upcoming Cherenkov Telescope Array (CTA) will provide increased sensitivity to high energy gamma rays and hence higher mass DM particles. When conducting analyses of the capability of CTA it is important to study the effects of backgrounds....
Michel Tytgat
(U)
25/06/2014, 17:35
Dark Matter Indirect Detection
Presentation
In this talk I will discuss some recent results regarding the gamma ray spectral features from the annihilation of a scalar dark matter particle interacting through a charged particle in the t-channel. In particular I will discuss the relative enhancement of the Bremsstrahlung signal and will present a new calculation of the annihilation in gamma ray lines. I will also present some...
Mr
Matthieu Kieffer
(LPNHE Paris)
25/06/2014, 17:50
Dark Matter Indirect Detection
Presentation
Weakly Interacting Massive Particles (WIMPs) are currently one of the most popular hypotheses to answer the question of the nature of Dark Matter. Gamma-ray line signatures from self-annihilation of WIMPs can be detected at very-high energies by the H.E.S.S. imaging air Cherenkov telescope in observations of the Galactic Center (GC) region. In 2012, phase II of H.E.S.S. started with the...
