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hep-th2004★ 8 cited
Back-Reaction of Cosmological Perturbations in the Infinite Wavelength Approximation
Robert H. Brandenberger, C. S. Lam
Cosmological perturbations in an expanding universe back-react on the space-time in which they propagate. Calculations to lowest non-vanishing order in perturbation theory indicate…
hep-th1998
Time-Ordered Products and Exponentials
C. S. Lam
I discuss a formula decomposing the integral of time-ordered products of operators into sums of products of integrals of time-ordered commutators. The resulting factorization enabl…