首页 | 本学科首页   官方微博 | 高级检索  
     


Brane Universes Tested by Supernovae Ia
Authors:Włodzimierz Godłowski  Marek Szydłowski
Affiliation:(1) Astronomical Observatory, Jagiellonian University, 30-244 Krakow, ul, Orla, 171, Poland
Abstract:
We discuss observational constraints coming from supernovae Ia imposed on the behaviour of the Randall-Sundrum models. In the case of dust matter on the brane, the difference between the best-fit Perlmutter model with a Lambda-term and the best-fit brane models becomes detectable for redshifts z > 1.2. It is interesting that brane models predict brighter galaxies for such redshifts which is in agreement with the measurement of the z = 1.7 supernova. We also demonstrate that the fit to supernovae data can also be obtained, if we admit the ldquosuper-negativerdquo dark energy (phantom matter) p = – (4/3)rhov on the brane, where the dark energy in a way mimics the influence of the cosmological constant. It also appears that the dark energy enlarges the age of the universe which is demanded in cosmology. Finally, we propose to check for dark radiation and brane tension by the application of the angular diameter of galaxies minimum value test. We point out the existence of coincidence problem for the brane tension parameter.
Keywords:Brane cosmology  dark energy  supernova
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号