FIZIKA B 15 (2006)  4, 163-182

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GENERATION OF BIANCHI TYPE V BULK VISCOUS COSMOLOGICAL MODELS WITH TIME-DEPENDENT L-TERM

ANIRUDH PRADHANa,d  KANTI JOTANIAb,e and ANJU RAIc,f

aDepartment of Mathematics, Hindu Post-Graduate College, Zamania-232 331, Ghazipur, India
bDept. of Physics, Faculty of Science, The M.S. University of Baroda, Vadodara-390 002, Gujarat, India
cDept. of Mathematics, Hindu Post-Graduate College, Zamania 232 331, Ghazipur, India
E-addresses: dpradhan@iucaa.ernet.in ekanti@iucaa.ernet.in fanjuraianju@yahoo.co.in

Received 5 November 2006;  Accepted 13 December 2006
Online 23 February 2007

Bianchi type V bulk viscous fluid cosmological models are investigated with dynamic cosmological term L(t). Using a generation technique (Camci et al., 2001), it is shown that the Einstein's field equations are solvable for any arbitrary cosmic scale function. Solutions for particular forms of cosmic scale functions are also obtained. The cosmological constant is found to be a decreasing function of time, which is supported by results from recent type Ia supernovae observations. Some physical and geometrical aspects of the models are also discussed.

PACS numbers: 98.80.Es, 98.80.-k
UDC 524.83

Keywords: cosmology, Bianch type V universe, cosmological constant

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