Relativity and Cosmology


Possible Experimental Evidence to the Converse Unruh Effect in Superconductors

Authors: Z.Y. Wang

Although there has not any direct evidence to the Unruh effect and Hawking radiation until now, the converse effect was maybe detected in superconductors. In a noteless experiment performed by scientists of USSR in 1984, a heat flow across the Josephson junction induced the a.c.component[1] and was interpreted to be a thermoelectric effect. Actually, the thermoelectric effect means a temperature gradient will generate an extra current. It occurs in a normal material but does not exist in superconductors. Here is a whole new effect that an extra phase difference rather than current is induced. We regard it as the converse Unruh effect where the temperature is corresponding to an acceleration. Then the temperature gradient will lead to an energy difference and consequential phase change just like the a.c.Josephson effect. Based on the postulate, the frequency formula dependent to the temperature difference T T dl is given which is in the region of ω = 4πkΔ/(ℏ2 VF) ∫(T1 - T2)dl radiowaves and consistent with the mentioned experiment. We hope further experiments will be carried out soon to make clear the phenomenon.

Comments: 3 pages.

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Submission history

[v1] 7 Dec 2009

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