Persistent current induced by vacuum fluctuations in a quantum ring

Torsion-induced persistent current in a twisted quantum ring.

We describe the effects of geometric torsion on the coherent motion of electrons along a thin twisted quantum ring. The geometric torsion inherent in the quantum ring triggers a quantum phase shift in the electrons' eigenstates, thereby resulting in a torsion-induced persistent current that flows along the twisted quantum ring. The physical conditions required for detecting the current flow are...

Dark energy as spacetime curvature induced by quantum vacuum fluctuations

Assuming that the vacuum expectation of the quantum vacuum energy-momentum is zero, I show that fluctuations give rise to a smooth curvature of spacetime. That curvature is currently attributed to a uniform energy-momentum tensor, known as “dark energy”.Our calculation leads to an estimate which roughly agrees with observations. An outstanding open problem in cosmology concerns the nature of “d...

Fluctuations in the Quantum Vacuum

We argue that it is a fluctuational underpinning of the Quantum vacuum which on the one hand gives a stochastic character to the conservation laws, and on the other is required for explaining the recently observed acceleration of the universe. This also provides us with the arrow of time, in a consistent cosmology.

Large “Dipolar” Vacuum Fluctuations in Quantum Gravity

We study a novel set of gravitational field configurations, called “dipolar zero modes”, which give an exactly null contribution to the Einstein action and are thus candidates to become large fluctuations in the quantized theory. They are generated by static unphysical sources satisfying (up to terms of order G) the simple condition ∫ dxT00(x) = 0. We give two explicit examples of virtual sourc...

Current and Current Fluctuations in Quantum Shuttles