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Low Energy States and CPT invariance at the Big Bang

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arxiv 2302.08812 v2 pith:KHJDVZVN submitted 2023-02-17 gr-qc hep-th

Low Energy States and CPT invariance at the Big Bang

classification gr-qc hep-th
keywords statesbangenergyquantumvacuumadiabaticconditioncpt-invariant
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this paper, we analyze the quantum vacuum in a radiation-dominated and CPT-invariant universe by further imposing the quantum states to be ultraviolet regular i.e., satisfying the Hadamard/adiabatic condition. For scalar fields, this is enforced by constructing the vacuum via the States of Low Energy proposal. For spin-$\frac{1}{2}$ fields, we extend this proposal for a FLRW spacetime and apply it for the radiation-dominated and CPT-invariant universe. We focus on minimizing the smeared energy density around the Big Bang and give strong evidence that the resulting states satisfy the Hadamard/adiabatic condition. These states are then self-consistent candidates as effective Big Bang quantum vacuum from the field theory perspective.

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