Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Stability of a w < - 1 Phase of Cosmic Acceleration   We consider a massless, minimally coupled scalar with a quartic
self-interaction which is released in Bunch-Davies vacuum in locally de Sitter
background of an inflating universe. It was shown, in this system, that quantum
effects can induce a temporary phase of super-acceleration causing a violation
of the Weak Energy Condition on cosmological scales. In this paper we
investigate the system's stability by studying the behavior of linearized
perturbations in the quantum-corrected effective field equation at one and
two-loop order. We show that the time dependence we infer from the
quantum-corrected mode function is in perfect agreement with the system
developing a positive mass squared. The maximum induced mass remains
perturbatively small and it does not go tachyonic. Thus, the system is stable.

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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: eess