Explanation
Unruh demonstrated theoretically that the notion of vacuum depends on the path of the observer through spacetime. From the viewpoint of the accelerating observer, the vacuum of the inertial observer will look like a state containing many particles in thermal equilibrium—a warm gas.
Although the Unruh effect would initially be perceived as counter-intuitive, it makes sense if the word vacuum is interpreted appropriately, as below.
Read more about this topic: Unruh Effect
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