Search Publications
Gas Density Profile in Dark Matter Halo in Chameleon Cosmology
Terukina, Ayumu; Yamamoto, Kazuhiro
We investigate the gas density, temperature, and pressure profiles in a dark matter halo under the influence of the chameleon force. We solve the hydrostatic equilibrium equation for the gas coupled with the chameleon field in an analytic manner, using an approximate solution for the chameleon field equation with the source term, with a generalize…
Sunyaev-Zel'dovich signal of the maxBCG SDSS galaxy clusters in WMAP
Rozo, Eduardo; Hao, Jiangang; Dodelson, Scott +1 more
The Planck Collaboration measured the Sunyaev-Zel’dovich decrement of optically selected clusters from the Sloan Digital Sky Survey, finding that it falls significantly below expectations based on existing mass calibration of the maxBCG galaxy clusters. Resolving this tension requires either the data to go up, or the theoretical expectations to co…
Constraints on non-Gaussianity from Sunyaev-Zeldovich cluster surveys
Mak, Daisy S. Y.; Pierpaoli, Elena
We perform a Fisher matrix analysis to forecast the capability of ongoing and future Sunyaev-Zeldovich cluster surveys in constraining the deviations from Gaussian distribution of primordial density perturbations. We use the constraining power of the cluster number counts and clustering properties to forecast limits on the fNL parameter…
Cold positrons from decaying dark matter
Boubekeur, Lotfi; Dodelson, Scott; Vives, Oscar
Many models of dark matter contain more than one new particle beyond those in the Standard Model. Often, heavier particles decay into the lightest dark matter particle as the Universe evolves. Here, we explore the possibilities which arise if one of the products in a (heavyparticle)→(darkmatter) decay is a positron, and the lifetime is shorter tha…
Amplitudes of thermal and kinetic Sunyaev-Zel'dovich signals from small-scale CMB anisotropies
Melchiorri, Alessandro; Cooray, Asantha; Pagano, Luca +4 more
While the arcminute-scale cosmic microwave background (CMB) anisotropies are due to secondary effects, point sources dominate the total anisotropy power spectrum. At high frequencies the point sources are primarily in the form of dusty, star-forming galaxies. Both Herschel and Planck have recently measured the anisotropy power spectrum of cosmic i…