IDM2010

Session

Parallel Session : Structure Formation & N-body simulations 3

29 juil. 2010, 13:40

Amphithéatre Dumontet (Montpellier 2 University)

75. The observational signatures of high-redshift dark stars

Dr Erik Zackrisson (Stockholm Observatory)

29/07/2010 13:40

Talk

The annihilation of dark matter particles in the centers of minihalos may lead to the formation of so-called dark stars, which are cooler, larger, more massive and potentially more long-lived than conventional population III stars. Here, we investigate the prospects of detecting high-redshift dark stars with upcoming James Webb Space Telescope (JWST). We find that individual dark stars with...

117. Signatures of Dark Star Remnants in the Galactic Halo

Pearl Sandick (Thoery Group and Texas Cosmology Center, the University of Texas at Austin)

29/07/2010 14:00

Talk

The very first stars likely formed from metal-free, molecular hydrogen-cooled gas at the center of dark matter minihalos. Prior to nuclear fusion, these stars may have been supported by dark matter heating from annihilations in the star. As the dark matter fuel supply became depleted, nuclear fusion and standard stellar evolution would have begun, and today the objects that began their lives...

136. JWST Detecting Dark Stars

Dr douglas spolyar (FermiLab/ University of Chicago)

29/07/2010 14:20

Talk

DM (dark matter) is essential for the formation of structure and the first stars in particular. If DM is a common thermal WIMP (for instance the LSP), DM heating due to annihilation of DM can dramatically alter the formation of the first stars. These "dark stars" are powered by DM and look dramatically different from typical stars. Dark stars would have been only a few hundred million...

110. WIMP capture for dark stars in the early universe

Mlle Sofia Sivertsson (Royal Institute of Technology (KTH))

29/07/2010 14:40

Structure Formation & N-body simulations

Talk

The first stars to form in the universe may have been Dark Stars, powered by dark matter annihilation instead of nuclear fusion. The initial amount of dark matter gathered by the star gravitationally can sustain it only for a limited period of time. It has been suggested that capture of additional dark matter from the environment can substantially prolong the dark star phase and the star's...

111. Watching dark matter stars burn - possible signatures of Dark Stars in the EBL

M. Andreas Maurer (University of Hamburg)

29/07/2010 15:00

Structure Formation & N-body simulations

Talk

Recently, it has been proposed that self-annihilating dark matter could have a significant effect on the formation and development of the first stars in the universe. In such a model, the energy from self-annihilation of dark matter particles may be the main power source for this class of young stellar objects called Dark Stars (DS). Their features (e.g. luminosity, temperature,...

139. The Inter-Galactic Populations and Unbound Dark Matter

Prof. Ing-Guey Jiang (National Tsing-Hua University)

29/07/2010 15:20

Talk

The diffused light between galaxies, as first discovered by Zwicky (1951), has been an interesting issue related with the evolution of galaxies. N-body simulations of mergers of galaxies with dark matter have been employed to address this topic. By N-body simulations, we investigate the production of intergalactic populations through head-on mergers. Our results show that single...