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This lecture covers the Soft de Sitter Effective Theory, focusing on the late-time and long-wavelength behavior of correlation functions. It delves into In-In perturbation theory, scalar fields in de Sitter spacetime, canonical quantization, power counting interactions, and dynamical dimensional regularization. The instructor discusses the implications of locality, removing lending interactions, and the dynamics of light scalars in de Sitter space. Additionally, the lecture explores the concept of dynamical RG stochastic inflation and the resummation of time-dependent logs in the context of effective field theory.
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