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FIZIKA B 15 (2006) 4, 163-182
 
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:
d[email protected]
e[email protected]
f[email protected]
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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