Quantum Field Theory In Curved Spacetime: Quant... Info

: General curved backgrounds lack global Poincaré invariance and time-translation symmetry, making it impossible to define a unique, preferred vacuum state.

. This approach serves as a robust approximation for environments where gravity is strong but quantum gravitational effects—such as fluctuations of the metric itself—are not yet dominant. 1. The Fundamental Shift: From Particles to Fields Quantum Field Theory in Curved Spacetime: Quant...

Quantum Field Theory in Curved Spacetime: Quantized Fields and Semiclassical Gravity and quantum mechanics:

: A second observer might decompose the same field using a different basis and operators Mixing : The new annihilation operator Quantum Field Theory in Curved Spacetime: Quant...

This framework predicts several landmark effects that bridge the gap between thermodynamics, gravity, and quantum mechanics: