A5027294134- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- CCD and CMOS Imaging Sensors
- Radiation Detection and Scintillator Technologies
- Adaptive optics and wavefront sensing
- Neutrino Physics Research
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Photocathodes and Microchannel Plates
- Radiation Therapy and Dosimetry
- High-Energy Particle Collisions Research
University of Amsterdam
2015-2018
University of Nottingham
2012-2015
Instituto de Astrofísica de Andalucía
2010-2012
Institute for High Energy Physics
2012
Universitat Autònoma de Barcelona
2012
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2007-2010
Institut d'Astrophysique de Paris
2009
Istituto Nazionale di Fisica Nucleare
2009
The Cherenkov Telescope Array (CTA) is a project for next-generation observatory very high energy (GeV-TeV) ground-based gamma-ray astronomy, currently in its design phase, and foreseen to be operative few years from now. Several tens of telescopes 2-3 different sizes, distributed over large area, will allow sensitivity about factor 10 better than current instruments such as H.E.S.S, MAGIC VERITAS, an coverage GeV several TeV, field view up deg. In the following study, we investigate...
We present global fits of the constrained Minimal Supersymmetric Standard Model (cMSSM) and Non-Universal Higgs (NUHM), including most recent CMS constraint on boson mass, 5.8 fb−1 integrated luminosity null Supersymmetry searches by ATLAS, new LHCb measurement BR(s → μ+μ−) 7-year WMAP dark matter relic abundance determination. include latest constraints from XENON100 experiment, marginalising over astrophysical particle physics uncertainties. Bayesian posterior profile likelihood maps...
We present new global fits of the constrained Minimal Supersymmetric Standard Model (cMSSM), including LHC 1/fb integrated luminosity SUSY exclusion limits, recent 5/fb constraints on mass Higgs boson and XENON100 direct detection data. Our analysis fully takes into account astrophysical hadronic uncertainties that enter when translating limits cMSSM parameter space. provide results for both a Bayesian Frequentist statistical analysis. find 2011 in combination with data can rule out...
We present updated global fits of the constrained Minimal Supersymmetric Standard Model (cMSSM), including most recent constraints from ATLAS and CMS detectors at LHC, as well results XENON100 experiment. Our robust analysis takes into account both astrophysical hadronic uncertainties that enter in calculation rate WIMP-induced recoils direct detection study consequences for neutralino Dark Matter, show current data already allow to robustly rule out so-called Focus Point region, therefore...
The Fermi-LAT collaboration has recently reported the detection of angular power above photon noise level in diffuse gamma-ray background between 1 and 50 GeV. Such signal can be used to constrain a possible contribution from dark matter (DM) induced photons. We estimate intensity features spectrum (APS) this potential DM signal, for both decaying annihilating candidates, by constructing template all-sky maps emission produced galactic halo its substructures, as well extragalactic...
Both cosmic shear and cosmological gamma-ray emission stem from the presence of dark matter (DM) in universe: DM structures are responsible for bending light weak-lensing regime those same objects can emit gamma rays, either because they host astrophysical sources (active galactic nuclei or star-forming galaxies) directly by annihilations (or decays, depending on properties particle). Such rays should therefore exhibit strong correlation with signal. In this Letter, we compute...
The isotropic gamma-ray background arises from the contribution of unresolved sources, including members confirmed source classes and proposed emitters such as radiation induced by dark matter annihilation decay. Clues about properties contributing sources are imprinted in anisotropy characteristics background. We use 81 months Pass 7 Reprocessed data Fermi Large Area Telescope to perform a measurement angular power spectrum analyze energies between 0.5 500 GeV, extending range considered...
Dark matter (DM) is currently searched for with a variety of detection strategies. Accelerator searches are particularly promising, but even if weakly interacting massive particles found at the Large Hadron Collider (LHC), it will be difficult to prove that they constitute bulk DM in Universe ${\ensuremath{\Omega}}_{\mathrm{DM}}$. We show significantly better reconstruction properties can obtained combined analysis LHC and direct data, by making simple Ansatz on local density...
We study the flux and angular power spectrum of gamma rays produced by dark matter (DM) annihilations in Milky Way (MW) extra-galactic halos. The annihilation signal receives contributions from: (a) smooth MW halo, (b) resolved unresolved substructures MW, (c) external DM halos at all redshifts, including (d) their substructures. Adopting a self-consistent description local substructures, we compute gamma-ray anisotropies show that, quite independently from prescription used for...
Dark Matter (DM) direct detection experiments usually assume the simplest possible 'Standard Halo Model' for Milky Way (MW) halo in which velocity distribution is Maxwellian. This model assumes that MW an isotropic, isothermal sphere, hypotheses are unlikely to be valid reality. An alternative approach derive a self-consistent solution particular mass of (i.e. obtained from its gravitational potential) using Eddington formalism, isotropy. In this paper we extend incorporate anisotropic...
The Cherenkov Telescope Array (CTA) will have a unique chance of discovery for large range masses in Weakly Interacting Massive Particles models dark matter. principal target matter searches with CTA is the centre Galactic Halo. best strategy to perform observations within few degrees Centre, Centre itself and most intense diffuse emission regions removed from analysis. Assuming cuspy density profile Milky Way, 500 hours this region provide sensitivities below thermal cross-section...
The next generation of ground-based Imaging Air Cherenkov Telescopes will play an important role in indirect dark matter searches. In this article, we consider two particularly promising candidate sources for annihilation signals, the nearby dwarf galaxies Draco and Willman 1, study prospects detecting such a signal soon-operating MAGIC II telescope system as well planned installation CTA, taking special care describing experimental features that affect detectional prospects. For first time...
In this work, starting from 21 months of data the Fermi Large Area Telescope (LAT), we derive maps residual isotropic γ-ray emission, a relevant fraction which is expected to be contributed by extragalactic diffuse background (EGB). We search for auto-correlation signals in above and cross-correlation signal with angular distribution different classes objects that trace large-scale structure Universe. compute two-point function Fermi-LAT at energies E > 1 GeV, 3 GeV 30 well Galactic plane...
We study the effect that uncertainties in nuclear spin-dependent structure functions have determination of dark matter (DM) parameters a direct detection experiment. show different models describe function specific target nuclei can lead to variations reconstructed values DM mass and scattering cross section. propose parametrization spin allows us treat these as three parameters, with central value deviation depend on nucleus. The method is illustrated for germanium xenon detectors an...
The munuSSM is a supersymmetric model that has been proposed to solve the problems generated by other extensions of standard particle physics. Given R-parity broken in munuSSM, gravitino natural candidate for decaying dark matter since its lifetime becomes much longer than age Universe. In this model, could be detectable through emission monochromatic gamma ray two-body decay. We study prospects Fermi-LAT telescope detect such lines 5 years observations most massive nearby extragalactic...
We recently proposed to cross-correlate the diffuse extragalactic gamma-ray background with gravitational lensing signal of cosmic shear. This represents a novel and promising strategy search for annihilating or decaying particle dark matter (DM) candidates. In present work, we demonstrate potential tomographic-spectral approach: measuring cross-correlation in separate bins redshift energy significantly improves sensitivity DM signal. Indeed, technique here takes advantage different scaling...
The Cherenkov Telescope Array (CTA) will have a unique chance of discovery for large range masses in Weakly Interacting Massive Particles models dark matter. principal target matter searches with CTA is the centre Galactic Halo. best strategy to perform observations within few degrees Centre, Centre itself and most intense diffuse emission regions removed from analysis. Assuming cuspy density profile Milky Way, 500 hours this region provide sensitivities below thermal cross-section...
The formation and evolution of black holes (BHs) inevitably affects the distribution dark baryonic matter in neighborhood BH. These effects may be particularly relevant around Supermassive Intermediate Mass Black Holes (IMBHs), which can lead to large (DM) overdensities, called spikes mini-spikes, respectively. Despite being larger more dense, evolve at very centers galactic halos, regions where numerous dynamical tend destroy them. Mini-spikes likely survive, they have been proposed as...
We study how the combined observation of dark matter in various direct detection experiments can be used to determine phenomenological properties WIMP matter: mass, spin-dependent (SD) and spin-independent (SI) scattering cross section off nucleons. A convenient choice target materials, including nuclei that couple particles through a significantly different ratio SD vs SI interactions, could break degeneracies determination those parameters single experiment cannot discriminate. In this...
Even if supersymmetric particles are found at the Large Hadron Collider (LHC), it will be difficult to prove that they constitute bulk of dark matter (DM) in Universe using LHC data alone. We study complementarity and DM indirect searches, working out explicitly reconstruction properties for a specific benchmark model coannihilation region 24-parameters model. Combining mock high-luminosity with presentday null searches gamma rays from dwarf galaxies Fermi Area Telescope, we show current...
We measure the cross-correlation between Fermi-LAT gamma-ray photons and over 1000 deg$^2$ of weak lensing data from Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS), Red Cluster Sequence (RCSLenS), Kilo Degree (KiDS). present first measurement tomographic cross-correlations application spectral binning to gamma rays lensing. The measurements are performed using an angular power spectrum estimator while covariance is estimated analytical prescription. verify accuracy our estimate by...
With positive signals from multiple direct detection experiments it will, in principle, be possible to measure the mass and cross sections of weakly-interacting massive particle (WIMP) dark matter. Recent work has shown that, with a polynomial parameterisation WIMP speed distribution, is make an unbiased measurement mass, without making any astrophysical assumptions. However, are not sensitive low-speed WIMPs and, therefore, model-independent approach will lead bias section. This problem can...
We review the consequences of growth and evolution black holes (BHs) for distribution stars dark matter (DM) around them. focus in particular on supermassive intermediate mass (SMBHs IMBHs, respectively), discuss under what circumstances they can lead to significant overdensities surrounding DM, thus effectively acting as DM annihilation boosters.