COSMO-15, the 19th annual International Conference on Particle Physics and Cosmology

Session

Dark Matter

8 Sept 2015, 14:00

Warsaw, Poland

Conveners

Dark Matter: DM

• Ki-Young Choi

Dark Matter: DM

• Ki-Young Choi

Dark Matter: DM

• Kiwoon Choi

Dark Matter: DM

• Kiwoon Choi

166. Detecting Particle Dark Matter Signatures by Cross-Correlating Gamma-Ray Anisotropies with Weak Lensing

Stefano Camera (Jodrell Bank Centre for Astrophysics, United Kingdom)

08/09/2015, 14:00

Both gravitational lensing and cosmological gamma-ray emission stem from the presence of dark matter (DM) in the universe. Indeed DM structures are responsible for the bending of light due to the gravitational lensing effect, and those same objects can emit gamma rays, either because they host astrophysical sources or directly by particle DM annihilations/decays. Such gamma rays should...

53. Interplay of ID, DD, and LHC searches in the MSSM

Enrico Maria Sessolo (National Centre for Nuclear Research, Poland)

08/09/2015, 14:20

We investigate the prospects for detection of neutralino dark matter in the 19-parameter phenomenological MSSM (pMSSM). We explore very wide ranges of the pMSSM parameters but pay particular attention to the higgsino-like neutralino at the 1 TeV scale, which has been shown to be a well motivated solution in many constrained supersymmetric models, as well as to a wino-dominated solution with...

54. Explaining the Galactic Center Excess with the MSSM

Alejandro Lopez (University of Michigan, United States)

08/09/2015, 14:40

The Fermi/LAT experiment measures a spherically symmetric excess in gamma-ray flux from the Galactic Center. The gamma-ray excess could be explained by annihilating dark matter. We aim to explain the Galactic Center Excess (GCE) via a neutralino in resonance with the higgs pseudoscalar. The MSSM parameter spaced is scanned in order to find the best fit to the gamma-ray flux signal measured at...

56. The relic density of heavy neutralinos

Andrzej Hryczuk (TU Munich, Germany)

08/09/2015, 15:00

We will discuss the relic density of TeV-scale neutralino dark matter in the pMSSM. We have recently developed a framework enabling us to calculate the Sommerfeld enhanced relic density in general pMSSM scenarios. We will present the results of a thorough investigation of certain regions of parameter space, focussing in particular on departures from the well known pure wino scenario: namely...

74. Nano-explosive detector for Dark Matter and Neutrinos

Maciej Gorski (National Centre for Nuclear Research, Poland)

08/09/2015, 15:20

65. The Warmness of Dark Matter from the Lyman alpha forest

Antonella Garzilli (Leiden University, Netherlands)

08/09/2015, 16:10

We reconsider the problem of determining the warmness of dark matter from the Lyman-alpha forest. In particular, we have re-analyzed the previous work of Viel et al 2013, based on high resolution Lyman-alpha forest spectra. We allow different cosmic thermal history than the one considered in the previous work; these cosmic thermal history are in agreement with other theoretical...

69. Minimal Asymmetric Dark Matter

Martin Krauss (INFN - Laboratori Nazionali di Frascati, Italy)

08/09/2015, 16:30

n the early Universe, any particle carrying a conserved quantum number and in chemical equilibrium with the thermal bath will unavoidably inherit a particle-antiparticle asymmetry. A new particle of this type, if stable, would represent a candidate for asymmetric dark matter (DM) with an asymmetry directly related to the baryon asymmetry. We study this possibility for a minimal DM sector...

71. XENON Dark Matter Search

Christopher Geis (Johannes Gutenberg-University Mainz, Germany)

08/09/2015, 16:50

The XENON suite of experiments, situated at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, aim at the direct detection of Dark Matter in the form of WIMPs (Weakly Interacting Massive Particles) via their elastic scattering off xenon nuclei. The detector concept is based on a dual phase liquid xenon time projection chamber. The currently operating phase of the XENON Dark Matter...

72. Dark-Matter Bound States from Feynman Diagrams

Marieke Postma (Nikhef, Netherlands)

08/09/2015, 17:10

If dark matter couples directly to a light force mediator, then it may form bound states in the early universe and in the non-relativistic environment of haloes today. In this talk I will present a field-theoretic framework for the computation of bound-state formation cross-sections, de-excitation and decay rates, in theories with long-range interactions. At low relative velocities of the...

62. A search for dark matter annihilation in the newly discovered dwarf galaxy Reticulum 2

Savvas Koushiappas (Brown University, United States)

08/09/2015, 17:30

I will present results from a search for gamma-ray emission in nine Milky Way satellites recently discovered in the Dark Energy Survey. The nearest of these, Reticulum 2, shows evidence for a signal in public Fermi data. The detected emission is consistent with annihilating dark matter with a particle mass less than a few hundred GeV. Different ways of treating the background yield different...

205. Cosmological black holes and accretion: causal structure and models for the dark sector

Daniel Guariento (Perimeter Institute for Theoretical Physics, Canada)

08/09/2015, 17:50

The generalized McVittie solution, representing a central time-dependent mass in an expanding cosmological background, has been shown to be an exact solution of a self-gravitating subset of the Horndeski class of scalar field actions, and constitutes an important example of an analytic solution for hairy black holes. Following the analysis performed on its fixed-mass counterpart, we...

76. Inflationary Imprints on Dark Matter

Tommi Tenkanen (University of Helsinki, Finland)

10/09/2015, 14:00

A generic feature of Standard Model extensions with no drastic modifications to the Higgs potential is that the Higgs is a light and energetically subdominant field during inflation. Inflationary fluctuations generically displace the field from its vacuum generating a primordial Higgs condensate. This sets specific out-of-equilibrium initial conditions for the hot big bang epoch which could...

77. Cogeneration and Pre-annihilation of Dark Matter by a New Gauge Interaction

Stephen Barr (University of Delaware, United States)

10/09/2015, 14:20

Sphalerons of a new non-Standard Model gauge interaction can cogenerate dark matter and baryonic matter. They can also wipe out the symmetric component of the dark matter by a process of "pre-annihilation.

80. Diluting the inflationary axion fluctuation by a stronger QCD in the early Universe

Sang Hui Im (Institute for Basic Science, Republic of Korea)

10/09/2015, 14:40

We propose a new mechanism to suppress the axion isocurvature perturbation, while producing the right amount of axion dark matter, within the framework of supersymmetric axion models with the axion scale induced by supersymmetry breaking. The mechanism involves an intermediate phase transition to generate the Higgs mu-parameter, before which the weak scale is comparable to the axion scale and...

81. Generating Luminous and Dark Matter During Inflation

Neil Barrie (University of Sydney, Australia)

10/09/2015, 15:00

We propose a simple mechanism for generating ordinary luminous and dark matter during cosmic inflation. This scenario involves an extension of the Standard Model through the introduction of a dark matter candidate/s and an anomalous U(1)_X gauge group. The general framework developed is found to be able to replicate both the observed matter-antimatter asymmetry and the dark-to-visible matter...

83. Dark matter with low reheating temperature

Krzysztof Turzynski (University of Warsaw, Poland)

10/09/2015, 15:20

We revisit the calculation of the abundance of the supersymmetric dark matter particles: neutralino, gravitino, singlino and axino, taking into account the possibility that the reheating temperature of the Universe after inflation can be of the order of the electroweak scale or even lower. This leads to dramatic departures of predictions from the usually considered case of high reheating...

85. Newtonian linear perturbations from the Schroedinger-Poisson equations

Adam Christopherson (University of Florida, United States)

10/09/2015, 16:10

Dark matter is a crucial ingredient of the standard cosmological model, making up over 80% of the total matter in the Universe. Although observational evidence strongly favors the existence of dark matter, we are yet to physically detect a particle, despite many attempts to do so. In order to model the dynamics of structure formation with dark matter one uses Newtonian physics, where we are...

87. IceCube potential for detecting Q-ball dark matter

Shinta Kasuya (Kanagawa University, Japan)

10/09/2015, 16:30

We study Q-ball dark matter in gauge-mediated supersymmetry breaking, and seek the possibility of detection in the IceCube experiment. We find that the Q balls would be the dark matter in the parameter region different from that for gravitino dark matter. In particular, the Q ball is a good dark matter candidate for low reheating temperature, which may be suitable for the...

89. Constraining the dark matter by 21cm signals

Kenji Kadota (Institute for Basic Science, Republic of Korea)

10/09/2015, 16:50

The future prospects for the constraints on the particle dark matter from the 21cm signals will be presented. The effects of the dark matter interactions with the baryons on the 21 cm observables will be discussed, along with its comparison with the complementary bounds from the direct dark matter search experiments. I will also discuss the 21 cm bounds on the ultra light dark matter which...

101. Super-weakly interacting Dark Matter

Alexey Boyarsky (Leiden University, Netherlands)

10/09/2015, 17:10

I will review model-independent bounds on the properties of DM particles and the current state of searches for the signatures of decayingh super-weakly intercating DM particles in astrophysical data.

102. Constraining the lifetime of Dark Matter

Thomas Tram (ICG Portsmouth University, United Kingdom)

10/09/2015, 17:30

The existence of Dark Matter has been confirmed by many different cosmological probes including observations of the Cosmic Microwave Background (CMB) and the Large Scale Structure (LSS) of the Universe. But what else can we learn about the nature of Dark Matter from CMB and LSS data? One parameter of interest is the decay rate of Dark Matter. Even though Dark Matter must be stable on...

103. A stable Higgs portal with vector dark matter

Mateusz Duch (University of Warsaw, Poland)

10/09/2015, 17:50

We explored an extension of the Standard Model by an additional U(1) gauge group and a complex scalar interacting through the Higgs portal. As the scalar is charged under this gauge factor, this simple model supplies a vector dark matter candidate satisfying the observed relic abundance and limits from direct dark matter searches at LUX and XENON. An additional Higgs-like state, that may be...