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Coherent States in Quantum Field Theory
This lecture explores the concept of coherent states in quantum field theory, focusing on de-Sitter space as a coherent state of gravitons. It discusses the important properties of de-Sitter space, the implications of de-Sitter in quantum field theory, and the role of coherent states in linear gravity. The instructor delves into the BRST quantization, the introduction of matter in general relativity, and the Maxwell equations with quantum corrections. The lecture concludes by emphasizing the necessity of representing de-Sitter as a coherent state of gravitons within the S-matrix framework.