Quantum Gravity Evaluation of Stimulated Graviton Emission in Superconductors
- Pp. 105-131 (27)Giovanni Modanese
It can be proven, using the Feynman path integral, that the vacuum state of Quantum Gravity contains localized fluctuations with large mass. Their interaction gives rise to a complex pattern of excited states. In particular, couples of equal virtual masses can be in a symmetrical superposition &#936; (ground state) or in an anti-symmetrical superposition &#936;<sup>-</sup>. Transitions &#936;<sup>+</sup> can be efficiently “pumped” only by a time-variable vacuum-energy-like term &#923;(t) associated with coherent matter. The decay &#936;<sup>-</sup> &#8594; &#936;<sup>+</sup> generates off-shell virtual spin 1 gravitons, which can also produce a cascade of stimulated emission, ending with absorption in a target. We compute to leading order the Einstein A and B coefficients of the transition and give magnitude order estimates for the amplification factor in YBCO crystals or melt-textured samples pumped by bulk supercurrents at frequency &#8776;10 MHz.