Viscous universes

Some Inhomogeneous Magnetized Viscous-Fluid Cosmological Models with Varying Λ

“…The expansion scalar θ has already been given by (49). Sincev i = v i ;j v j = 0, the motion is geodetic.…”

“…However, bulk viscosity is expected to play an important role at certain stages of expanding universe. 46−48 It has been shown that bulk viscosity leads to inflationary like solution, 49 and acts like a negative energy field in an expanding universe. 50 Furthermore, there are several processes which are expected to give rise to viscous effects.…”

Big Rip Singularity in 5D Viscous Cosmology

“…Dark energy model can be divided into two categories: (i) scalar field dark energy models *Address correspondence to this author at the Department of Mathematics, Rashtrasant Tukadoji Maharaj Nagpur University, Mahatma Jyotiba Phule Educational Campus, Amravati Road, Nagpur-440033, India; Tel: 91-9011323123; E-mail: gkhadekar@yahoo.com including a quintessence (Wang et al [12]) and phantom (Caldwell [13]), and (ii) interacting dark energy models, by considering the interaction including Chaplygin gas (Kamenohehik et al [14]), generalized Chaplygin gas (Bento et al [15]) and a linear equation of state (Babichev et al [16]). The bulk viscosity in isotopic space bulk and shear viscosity in anisotropic space are presented by (Padmanabham and Chitre [17]). The Planck data show that the Hubble constant H is the tension with that measure by the several direct probes on H. The Planck data favor < -1 when the "supernova legacy survey" is complicated.…”

“…Recently, Gorbunova and Diego Saez-Gomez [31] described the influence of Casimir effects near the Big Rip singularity in viscous cosmology. Also Padmanabhan and Chitre [17] studied a constant and an oscillating dark energy fluid that crosses the phantom barrier ( <-1) and derives the universe evolution to a Big rip singularity.…”

Tilted bianchi type v bulk viscous cosmological models in general relativity

“…However, the relationship assumed by Murphy between the viscosity coefficient and the matter density is not acceptable at large density. The effect of bulk viscosity on the cosmological evolution has been investigated by a number of authors in the framework of general theory of relativity (Pavon [35], Padmanabhan and Chitre [36], Johri and Sudarshan [37], Maartens [38], Zimdahl [39], Santos et al [40], Pradhan, Sarayakar and Beesham [41], Kalyani and Singh [42], Singh, Beesham and Mbokazi [43], Pradhan et al [44]). This motivates to study cosmological bulk viscous fluid model.…”