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The late-time behaviour of ( Phi 2 ) is studied for a massless minimally coupled scalar field in cosmological models with power law expansion. It is shown that ( Phi 2 ) approaches a constant value at late times if the expansion of the universe is inflationary. An exact solution of the Klein-Gordon equation has been obtained for a two-component universe consisting of dust and radiation. It is found that the state corresponding to the adiabatic vacuum in this case exhibits an infrared divergence at all times.
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Varun Sahni (1988) studied this question.
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