Question

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✴Explain Unruh Effect
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Answer 1

● The Unruh effect is the fact that an observer who is accelerating doesn't 'see' a vacuum, but a thermal bath of particles with an effective temperature proportional the proper acceleration.

● In other words, the **particle content** of a given state in a quantum field theory depends on the frame of reference, i.e. on the observer - as a consequence of which what one observer sees as vacuum another describes as being riddled with particles.