Unruh Effect
A full lecture reconstruction showing how the inertial vacuum of a quantum field appears thermal to a uniformly accelerating observer, using a massless scalar field in 1+1 dimensions, two-mode squeezed states, Rindler coordinates, and the emergence of the Unruh temperature.
Introduction
The Unruh effect is one of the cleanest demonstrations that in quantum field theory, the notion of “particle” is not absolute. It depends on the observer.
An inertial observer can regard a field state as vacuum, meaning no particles are present. But a uniformly accelerating observer can describe the **same state** as thermal, as if immersed in a bath of particles at some non
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