Книга: Mahmoud Hashim «Bulk and Shear Viscosity in the Early Universe Cosmology»

Bulk and Shear Viscosity in the Early Universe Cosmology

Производитель: "LAP Lambert Academic Publishing"

We consider the evolution of a flat, isotropic and homogeneous Friedmann-Lemaitre-Robertson-Walker Universe, filled with a causal bulk viscous cosmological fluid, that can be characterized by an ultra-relativistic equation of state, and bulk viscosity coefficient obtained from recent lattice Quantum Chromodynamics calculations. The basic equation for the Hubble parameter is derived under the assumption that the total energy in the Universe is conserved. By assuming a power law dependence of bulk viscosity coefficient, temperature and relaxation time on energy density, an approximate solution of the field equations has been obtained, in which we utilized equations of state from recent lattice Quantum Chromodynamics simulations and heavy-ion collisions to derive an evolution equation. In viscous cosmology, there is no evidence for singularity. For example, both Hubble parameter and scale factor have a finite value at time equal to zero. To avoid any controversial argumentation about the... ISBN:9783846504550

Издательство: "LAP Lambert Academic Publishing" (2011)

ISBN: 9783846504550

См. также в других словарях:

  • Mahmoud Karim — Mahmoud el Karim (1916 1999) was a squash player from Egypt. He won the British Open men s title four consecutive times from 1947 1950. Playing career Karim first played golf and tennis at the Gezira Sporting Club in Cairo before discovering… …   Wikipedia

  • Hashim Khan — (Urdu: ہاشم خان ) is a former squash player from Pakistan. He won the British Open seven times between 1951 and 1958. He is widely considered to be one of the greatest squash players of all time, and was the first great player to emerge from a… …   Wikipedia

  • Mahmoud — Mohammed Mohammed (m[=o]*h[a^]m m[e^]d) n. [ The praised one .] [Also spelled {Mahomed}, {Mahomet}, {Muhammad} (the Arabic form), {Mahmoud}, {Mehemet}, etc.] The prophet who founded Islam (570 632). Syn: Muhammad, Mahomet, Mahmoud. [WordNet 1.5]… …   The Collaborative International Dictionary of English

  • Natik Hashim — Personal information Full name Natik Hashim Abidoun Date of birth January 15, 1960( …   Wikipedia

  • Abu-l-Qâsim Muhammad Ibn `Abd Allâh Ibn `Abd Al-Muttalib Ibn Hâshim — Mahomet Religion religions abrahamiques …   Wikipédia en Français

  • Championnats de squash du British Open — Le British Open est l un des plus vieux et prestigieux tournois de squash. Il se déroule au Royaume Uni. Il est considéré avec le World Open comme l un des deux plus grands tournois annuels en termes de notoriété. En effet, après la mise en place …   Wikipédia en Français

Поделиться ссылкой на выделенное

Прямая ссылка:
Нажмите правой клавишей мыши и выберите «Копировать ссылку»