Conveners
Dark Matter: Cosmological Aspects
- Mark Lovell (Universiteit van Amsterdam)
Dark Matter: Cosmological Aspects
- matteo viel
Dark Matter: Cosmological Aspects
- There are no conveners in this block
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Prof. Matthew Walker (CMU)26/06/2014, 16:30Dark Matter: Cosmological AspectsPresentationThe Local Group's dwarf galaxies represent the lower limit of galaxy formation. Inferences about the amount and spatial distribution of dark matter within these objects has can provide tests of cosmological models and predictions for indirect detection experiments. I will summarize current observational constraints and discuss prospects for improvement.Go to contribution page
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Dr Jorge Penarrubia (Royal Observatory Edinburgh)26/06/2014, 16:50Dark Matter: Cosmological AspectsPresentationDwarf spheroidal galaxies are the faintest galaxies in the Universe and as such play a fundamental role in galaxy formation models. In addition, their internal kinematics suggest the presence of large amounts of non-baryonic matter on very small scales. In models where dark matter (DM) consists of exotic particles formed shortly after the Big Bang, the high phase-space densities inferred in...Go to contribution page
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Pascal Steger (E)26/06/2014, 17:10Dark Matter: Cosmological AspectsPresentationWe propose a new non-parametric method to determine the mass distribution in spherical systems. A high dimensional parameter space encoding tracer density, line of sight velocity anisotropy and total mass density is sampled using MultiNest. Without assumptions on the functional form of any of these profiles, we can reproduce reliably the total mass density and velocity anisotropy...Go to contribution page
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Dr Oleg Ruchayskiy (Ecole Polytechnique Federale de Lausanne)26/06/2014, 17:30Dark Matter: Cosmological AspectsPresentationAnalyses of the cosmic microwave background anisotropies and of galaxy survey data allow for the possibility that dark matter particles were born relativistic yet became non-relativistic well before matter-radiation equality. Such "warm" or "cold plus warm" dark matter models may still have observable signatures at sub-Mpc scales, e.g. modifying the structure of galactic halos and their...Go to contribution page
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tom theuns (d)26/06/2014, 17:50Dark Matter: Cosmological AspectsPresentationI will discuss the key difference between warm dark matter and cold dark matter on the formation of Milky Way-like galaxies, demonstrating that a generic aspect of WDM is the formation of stars in filaments that connect to the forming galaxy. Such dense filaments also appear as Lyman Limit systems (LLSs) in the spectra of background QSOs, and the correlation function of LLSs could...Go to contribution page
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Aaron Ludlow (Argelander-Institut fuer Astronomie)26/06/2014, 18:10Dark Matter: Cosmological AspectsPresentationI will discuss the relation between the accretion history and mass profile of cold dark matter (CDM) haloes, emphasizing how an appropriate definition of their formation times can be used to determine their characteristic radii. This result is based on the finding that the average mass accretion history, expressed in terms of the critical density of the Universe, resembles the enclosed...Go to contribution page
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Dr Paolo Salucci (SISSA)27/06/2014, 14:00Dark Matter: Cosmological AspectsPresentationRecent observations have revealed the structural properties of the dark and luminous mass distribution in spirals. These results led to the vision of a new and amazing scenario. The investigation of single and coadded objects has unanimously shown that the rotation curves of spirals follow, from their centres out to their virial radii, a universal profile. This profile implies a tuned...Go to contribution page
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Miguel Pato (TU Munich)27/06/2014, 14:20Dark Matter: Cosmological AspectsPresentationThe distribution of dark matter in the Milky Way is poorly constrained at present and represents a major uncertainty for both direct and indirect dark matter searches. In this talk, I shall present new constraints on the dark matter distribution based on photometric and dynamical observations of our Galaxy. First, state-of-the-art models for the distribution of baryons are calibrated against...Go to contribution page
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fabio iocco (Instituto de Fisica Teorica)27/06/2014, 14:40Dark Matter: Cosmological AspectsPresentationWe use a new compilation of data for the Rotation Curve of our own Galaxy in order to assess evidence for a Dark component of matter. We construct the rotation curve expected from a large sample of models of the baryonic (star and gas) component of the Milky Way, and infer the missing component with high statistical evidence. This model-independent approach shows evidence for a dark component...Go to contribution page
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Pol Mollitor (L)27/06/2014, 15:00Dark Matter: Cosmological AspectsPresentationWe study three high resolution cosmological hydrodynamical simulations of Milky Way-sized halos including a comparison with the corresponding DM-only runs performed with the adaptive mesh refinement code RAMSES. We analyse the stellar and gas distribution and find one of our simulated galaxies with interesting Milky Way like features with regard to several observational tests. Thanks to...Go to contribution page
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Mr Tom Richardson (King's College London)27/06/2014, 15:20Dark Matter: Cosmological AspectsPresentationDetailed measurements of the dark matter density profile in systems such as dwarf galaxies and galaxy clusters would allows us to test predictions from N-body simulations of cold dark matter and how complex astrophysical effects and interactions with baryons may have reshaped dark matter halos. Traditionally, the Jeans equation is used to constrain the dark matter density profile in spherical...Go to contribution page
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Dr Aurel Schneider (University of Sussex)27/06/2014, 15:40Dark Matter: Cosmological AspectsPresentationI will discuss the scenario of sterile neutrino dark matter produced by decays of heavy scalars. This is an ideal toy example to illustrate how the production of dark matter influences the formation of structures in the universe.Go to contribution page
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Joern Kersten (University of Bergen)27/06/2014, 16:30Dark Matter: Cosmological AspectsPresentationDespite the astonishing success of standard $\Lambda$CDM cosmology, there is mounting evidence for a tension with observations at small and intermediate scales (missing satellites, cusp vs. core and too big to fail problems). We introduce a simple model where both cold dark matter (DM) and sterile neutrinos are charged under a new $U(1)_X$ gauge interaction. The resulting DM...Go to contribution page
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Dr Katarina Markovic (University of Manchester)27/06/2014, 16:50Dark Matter: Cosmological AspectsPresentationWarm Dark Matter (WDM) is a generalisation of the standard Cold Dark Matter model in the sense that it does not assume dark matter particles to be absolutely cold. In the simplest models all dark matter is made of the same particles, which started out in thermal equilibrium and cooled to effectively become cold today. If such particles have masses of the order of a keV or less, they leave an...Go to contribution page
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Francesc Ferrer (W)27/06/2014, 17:10Dark Matter: Cosmological AspectsPresentationThe cold dark matter at the center of a galaxy will be redistributed by the presence of a massive black hole. We apply the adiabatic growth framework in a fully relativistic setting to obtain the final dark-matter density for both cored and cusped initial distributions. Besides the implications for indirect detection estimates, we show that the gravitational effects of such a dark-matter spike...Go to contribution page
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Dr Jan Hamann (CERN)27/06/2014, 17:30Dark Matter: Cosmological AspectsPresentationLight sterile neutrinos with masses of order 1 eV have been suggested to resolve anomalies in various neutrino oscillation experiments. In a cosmological context, these sterile neutrinos would act as a (hot) dark matter component. I will review their impact on cosmological observables and discuss the observational status following the recent measurements of the cosmic microwave background...Go to contribution page
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Prof. Annika Peter (The Ohio State University)27/06/2014, 17:50Dark Matter: Cosmological AspectsPresentationThe simplest phenomenological model for cosmological dark matter is the “cold dark matter” (CDM) model. This model assumes that dark matter is cold, collisionless, and stable. Recently, these three tenets of CDM have been challenged on both observational and theoretical grounds. In this talk, I present a review of recent work on investigations into the stability of dark matter. I consider...Go to contribution page
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Mr Ryan Wilkinson (IPPP, Durham University)27/06/2014, 18:10Dark Matter: Cosmological AspectsPresentationDespite the large number of dedicated experiments, an understanding of the particle nature of dark matter and direct evidence for its existence have remained elusive. However, detection methods generally assume that dark matter consists of cold, massive particles. In this talk, I will discuss how cosmological data from the CMB and Large-Scale Structure can be used to study dark matter...Go to contribution page