Quantum Field Theory in Curved Spacetime: Quantized Fields and Gravity

By L. Parker, D. Toms. 2009

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Palatini Approach to Modified Gravity: f(R) Theories and Beyond (2011, unknown): “+ √ −gfR [gS λσ + gS λσ + gS σλ] , (11) where∇λ ( −gfRgμν) only depends on the symmetric part of the connection, which means that ∇λAμ = ∂λAμ − C ρ λμAρ.”
Non-gaussianities and the Stimulated creation of quanta in the inflationary universe (2010, methodology): “On the one hand, an acceptable initial state must insure that physical quantities such as the energy-momentum tensor do not diverge when using standard methods of renormalization in curved spacetimes (see, for instance, [1]).”
Traversable wormholes via a double trace deformation (2016, methodology): “In this formula, one must renormalize the stress tensor by subtracting the coincident point singularities from the 2-point function, which are given by the Hadamard conditions [40].”