Cluster abundances and S-Z power spectra: effects of non-Gaussianity and early dark energy - AstrophysicsReportar como inadecuado




Cluster abundances and S-Z power spectra: effects of non-Gaussianity and early dark energy - Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: In the standard Lambda CDM cosmological model with a Gaussian primordialdensity fluctuation field, the relatively low value of the mass varianceparameter sigma 8=0.74{+0.05}{-0.06}, obtained from the WMAP 3-year dataresults in a reduced likelihood that the measured level of CMB anisotropy onthe scales of clusters is due to the Sunyaev-Zeldovich S-Z effect. To assessthe feasibility of producing higher levels of S-Z power, we explore twoalternative models which predict higher cluster abundance. In the first modelthe primordial density field has a chi^2 1 distribution, whereas in the secondan early dark energy component gives rise to the desired higher clusterabundance. We carry out the necessary detailed calculations of the levels ofS-Z power spectra, cluster number counts, and angular 2-point correlationfunction of clusters, and compare in a self-consistent way their predictedredshift distributions. Our results provide a sufficient basis upon which theviability of the three models may be tested by future high qualitymeasurements.



Autor: S. Sadeh, Y. Rephaeli, J. Silk

Fuente: https://arxiv.org/







Documentos relacionados