Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hubble Induced Mass in Radiation Dominated Universe   We reconsider the effective mass of a scalar field which interact with
visible sector via Planck-suppressed coupling in supergravity framework. We
focus on the radiation-dominated (RD) era after inflation. In this era, the
effective mass is given by thermal average of interaction terms. To make our
analysis clear, we rely on Kadanoff-Baym equations to evaluate the thermal
average. We find that, in RD era, a scalar field acquires the effective mass of
the order of $H$.

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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con