Experimental observation of acceleration-induced thermality.

We examine the radiation emitted by high energy positrons channeled into silicon crystal samples. The positrons are modeled as semiclassical vector currents coupled to an Unruh-DeWitt detector to incorporate any local change in the energy of the positron. In the subsequent accelerated QED analysis, we discover a Larmor formula and power spectrum that are both thermalized by the acceleration. As such, these systems will explicitly exhibit thermalization of the detector energy gap at the celebrated Fulling-Davies-Unruh temperature. Our derived power spectrum, with a nonzero energy gap, is then shown to have an excellent statistical agreement with high energy channeling experiments. The presence of accelerated thermality is also verified by the simultaneous confirmation of the Bekenstein-Hawking area-entropy law. As such, we present the very first experimental observation of the Unruh effect and measurement of the Planck area.