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gr-qc2018
Thermodynamics of Quantum Fields in Nonstationary Spacetimes
Klaus Fredenhagen, Thomas-Paul Hack, Nicola Pinamonti
Quantum field theory (QFT) on non-stationary spacetimes is well understood from the side of the algebra of observables. The state space, however, is largely unexplored, due to the…
gr-qc2018
Approaches to linear local gauge-invariant observables in inflationary cosmologies
Markus B. Fröb, Thomas-Paul Hack, Igor Khavkine
We review and relate two recent complementary constructions of linear local gauge-invariant observables for cosmological perturbations in generic spatially flat single-field inflat…