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FIZIKA B 19 (2010) 1, 17-28
 
A CLASS OF INHOMOGENEOUS MESONIC PERFECT FLUID MODELS WITH TIME-DEPENDENT
L-TERM
R. C. SAHUa and L. K. MOHAPATRAb
aDepartment of Mathematics, K. S. U. B. College, Bhanjanagar 761 126,
Orissa, India
E-mail address: [email protected]
bPrincipal, UCP Engineering School, Berhampur-10, Ganjam, Orissa,
India
E-mail address:
[email protected]
Received 12 May 2009; Revised manuscript received 14 January 2010
Accepted 27 January 2010 Online 19 May 2010
A class of non-static inhomogeneous cosmological models are investigated with
cosmological term L(t) when source of the
gravitational field is generated by a mixture of meson field and perfect fluid.
Using gamma law equation of state, Einstein's field equations are solved for two
particular cases which are physically important. The cosmological term
L(t) is found to be a decreasing function of time, which is supported by
results found from recent type Ia supernovae observations. Some physical and
geometrical aspects of the models are also discussed.
PACS number: 04.20.-q
UDC 524.83, 52-423
Keywords: cosmology, cosmological constant, massless scalar field, perfect
fluid
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