Abstract Details
| Name: MOHAMMAD SHAFI KHAN Affiliation: GOVT. DEGREE C OLLEGE BEMINA SRINAGAR KASHMIR 190018. Conference ID: ASI2017_1042 Title : Cosmological Evolution of the Universe from Big Bang to Structure Formation Authors and Co-Authors : Mohammad Shafi Khan and Manzoor Ahmad Malik 1Department of Physics, University of Kashmir,Srinagar-190006, J&K, India 2Visiting Associate, Inter-university Centre for Astronomy and Astrophysics, Pune 411007. Abstract Type : Poster Abstract Category : General Relativity and Cosmology Abstract : We study the phase transitions occurring in the gravitational clustering of galaxies on the basis of specific heat analysis and Yang-Lee theory. The investigations have been carried out in terms of time since big bang, re-placing the temperature in earlier work (paper I). It is found that a first order phase transition occurs when galaxies cluster gravitationally from an initial homogenous phase. We calculate its properties here and find that it differs from the usual laboratory phase transitions in so many ways. While the usual laboratory phase transitions are sudden and decisive , the cosmological case is never complete since it takes longer to evolve dynamically on larger spatial scales. At a critical time tc, the system breaks the symmetry from homogeneity and there is growth of correlation functions from a linear to a non-linear regime. The application of Yang- Lee theory of phase transitions reassures the phase change significance. The results of Yang-Lee theory of phase transitions applied to the gravitational clustering of galaxies closely match with those from specific heat analysis. |