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FIZIKA B 19 (2010) 2, 81-90
 
BIANCHI TYPE-III STRING COSMOLOGICAL MODELS FOR STIFF AND ANTI-STIFF FLUID
IN GENERAL RELATIVITY
HASSAN AMIRHASHCHIa and HISHAMUDDIN ZAINUDDINb
a,bPhysics Department, Universiti Putra Malaysia, 43400 UPM, Serdang,
Selangor D.E. Malaysia
aPhysics Department, Mahshahr Islamic Azad University, Mahshahr, Iran
E-mail address: h.amirhashchi@mahshahriau.ac.ir
bLaboratory of Computational Sciences and Informatics, Institute for
Mathematical Research, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor
D.E., Malaysia E-mail address: hisham@putra.upm.edu.my
Received 13 September 2009; Accepted 21 April 2010
Online 28 May 2010
Bianchi type-III string cosmological models in the presence of stiff and
anti-stiff fluids are studied. The scalar expansion is assumed to be
proportional to the shear. In the present study, we consider two cases (i) p+r
= 0 and (ii) p-r = 0,
where r and p are the rest energy density and the
pressure of the fluid, respectively. The physical behavior of these models is
also discussed.
PACS numbers: 98.80.Cq, 04.20.-q
UDC 524.83, 52-423
Keywords: Bianchi type-III models; stiff fluid; anti-stiff fluid
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