Abstract
Cosmological solutions in the presence of an imperfect fluid and zero-mass scalar field are obtained in higher derivative theory. We investigate both power law and exponential expansion of the universe described by full causal theories proposed by Israel and Stewart. It is observed that energy density, co-efficient of bulk viscosity decrease with time in the presence of massless scalar field and temperature increase with expansion of universe.
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Singh, N.I., Singh, S.S. & Romaleima Devi, S. Causal viscous universe coupled with zero-mass scalar field in higher derivative theory. Astrophys Space Sci 334, 187–191 (2011). https://doi.org/10.1007/s10509-011-0692-z
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DOI: https://doi.org/10.1007/s10509-011-0692-z