Format results
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A New look at Dark Matter in the Universe
Manoj Kaplinghat - University of California, Irvine
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Self-interacting scalar fields and the Eot-Wash experiment
Amol Upadhye - University of Wisconsin–Madison
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String Cosmology in the Hagedorn Phase
Subodh Patil - Université de Genève
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Expressing the equation of state parameter in terms of the three dimensional cosmic shear
Ramy Brustein - Ben-Gurion University of the Negev
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What does the CMB really tell us about inflation?
William Kinney - State University of New York (SUNY)
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Mapping the polarized sky with WMAP: Methods and new cosmological insights
Olivier Dore - National Aeronautics and Space Administration
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Modifications to the Properties of the Higgs Boson
Mark Wise - California Institute of Technology (Caltech)
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A New look at Dark Matter in the Universe
Manoj Kaplinghat - University of California, Irvine
The best studied class of dark matter candidates in Supersymmetric theories is the WIMP, Weakly Interacting Massive Particles, which makes cold dark matter. There is a well-motivated alternative to the WIMP -- dark matter populated by decays of WIMPs. This dark matter from decays is closer in spirit… -
Self-interacting scalar fields and the Eot-Wash experiment
Amol Upadhye - University of Wisconsin–Madison
Experiments have ruled out unit-strength scalar-mediated fifth forces on scales ranging from 0.1 mm to 10,000 AU. However, allowing the scalar to have a quartic self-interaction weakens these constraints considerably. This weakening is due to the "chameleon mechanism", which gives the scalar field… -
String Cosmology in the Hagedorn Phase
Subodh Patil - Université de Genève
It has recently been proposed by Nayeri, Brandenberger and Vafa, that the thermodynamics of strings in the early universe can provide us with a causal mechanism to generate a scale invariant spectrum of primordial density fluctuations, without requiring an intervening epoch of inflation. We will… -
Early stages of the universe: brane gas-driven bulk dynamics
We propose a new brane world scenario. In our model, the Universe starts as a small bulk filled with a dense gas of branes. The bulk is bounded by two orbifold fixed planes. An initial stage of isotropic expansion ends once a weak potential between the orbifold fixed planes begins to dominate… -
Mirage Inflation
A cosmological model based on an inhomogeneous D3-brane moving in an AdS_5 X S_5 bulk is introduced. Although there is no special points in the bulk, the brane Universe has a center and is isotropic around it. The model has an accelerating expansion and its effective cosmological constant is… -
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Accelerated expansion from structure formation
I discuss the backreaction of inhomogeneities on the expansion of the universe. The average behaviour of an inhomogeneous spacetime is not given by the Friedmann-Robertseon-Walker equations. The new terms in the exact equations hold the possibility of explaining the observed acceleration without a… -
Expressing the equation of state parameter in terms of the three dimensional cosmic shear
Ramy Brustein - Ben-Gurion University of the Negev
We express the total equation of state parameter of a spatially flat Friedman-Robertson-Walker universe in terms of derivatives of the red-shift dependent spin-weighted angular moments of the two-point correlation function of the three dimensional cosmic shear. In the talk I will explain all the… -
What does the CMB really tell us about inflation?
William Kinney - State University of New York (SUNY)
The recently released WMAP 3-year data on the anisotropy and polarization of the Cosmic Microwave Background is a milestone in cosmology. For the first time, it is possible to rule out popular models of inflation in the early universe. However, the WMAP3 data contain interesting hints which indicate… -
Mapping the polarized sky with WMAP: Methods and new cosmological insights
Olivier Dore - National Aeronautics and Space Administration
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Phenomenological aspects on N=1, four-dimensional Type IIB string theory compactifications with all moduli stabilised
I will discuss phenomenological aspects on N=1, four-dimensional Type IIB string theory compactifications with all moduli stabilised. In particular, I will review a class of compactifications with exponentially large volumes of the Calabi-Yau manifold and derive explicit formulae for bulk and D3/D7… -
Modifications to the Properties of the Higgs Boson
Mark Wise - California Institute of Technology (Caltech)