Scalar tensor theory : validity of Cosmic no hair conjecture
Sudeshna Mukerji, Nairwita Mazumder, Ritabrata Biswas, Subenoy, Chakraborty
TL;DR
This paper investigates the validity of the cosmic no hair conjecture within scalar tensor theories of gravity, analyzing conditions in both Jordan and Einstein frames to determine when the conjecture holds.
Contribution
It provides a comparative analysis of the conditions required for the cosmic no hair conjecture to be valid in scalar tensor theories across different frames.
Findings
In Jordan frame, restrictions include coupling function and parameter plus energy conditions.
In Einstein frame, restrictions are solely on energy conditions.
The validity of CNHC depends on frame-specific restrictions.
Abstract
The paper deals with cosmic no hair conjecture in scalar tensor theory of gravity. Here we have considered both Jordan frame and Einstein frame to examine the conjecture. In Jordan frame, one should restrict both the coupling function of the scalar field and the coupling parameter in addition to the ususal energy conditions for the the matter field for the validity of CNHC while in Einstein frame the restrictions are purely on the energy conditions.
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