29 citations · 50 across the 2 of their papers we have counts for
5 papers
Hubble Parameter in QCD Universe for finite Bulk Viscosity
A. Tawfik, M. Wahba, H. Mansour +1
We consider the influence of the perturbative bulk viscosity on the evolution of the Hubble parameter in the QCD era of the early Universe. For the geometry of the Universe we assu…
Bulk and Shear Viscosity in Hagedorn Fluid
A. Tawfik, M. Wahba
Assuming that the Hagedorn fluid composed of known particles and resonances with masses GeV obeys the {\it first-order} theory (Eckart) of relativistic fluid, we discuss the…
Viscous Quark-Gluon Plasma in the Early Universe
A. Tawfik, M. Wahba, H. Mansour +1
We consider the evolution of a flat, isotropic and homogeneous Friedmann-Robertson-Walker Universe, filled with a causal bulk viscous cosmological fluid, that can be characterized…
Hubble Parameter in Bulk Viscous Cosmology
A. Tawfik, H. Mansour, M. Wahba
We discuss influences of bulk viscosity on the Early Universe, which is modeled by Friedmann-Robertson-Walker metric and Einstein field equations. We assume that the matter filling…
Dissipative Processes in the Early Universe: Bulk Viscosity
A. Tawfik, T. Harko, H. Mansour +1
In this talk, we discuss one of the dissipative processes which likely take place in the Early Universe. We assume that the matter filling the isotropic and homogeneous background…