منابع مشابه
Dark Energy From Vacuum Fluctuations
The nature of the dark energy (DE) is one of the most outstanding problems of physical sciences today. Numerous and often ingenious attempts have been made to explain it, with multiple new papers appearing daily, yet no model proposed so far has gained a general acceptance. Modern approaches to the problem date from the pioneering papers by Zel’dovich [1], who was first to recognize the fundame...
متن کاملMeasurability of vacuum fluctuations and dark energy
Vacuum fluctuations of the electromagnetic field induce current fluctuations in resistively shunted Josephson junctions that are measurable in terms of a physically relevant power spectrum. In this paper we investigate under which conditions vacuum fluctuations can be gravitationally active, thus contributing to the dark energy density of the universe. Our central hypothesis is that vacuum fluc...
متن کاملDark 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...
متن کاملDark energy from primordial inflationary quantum fluctuations.
We show that current cosmic acceleration can be explained by an almost massless scalar field experiencing quantum fluctuations during primordial inflation. Provided its mass does not exceed the Hubble parameter today, this field has been frozen during the cosmological ages to start dominating the Universe only recently. By using supernovae data, completed with baryonic acoustic oscillations fro...
متن کاملDecoherence from Vacuum Fluctuations
Vacuum fluctuations are a source of irreversibility and decoherence. We investigate the persistent current and its fluctuations in a ring with an in-line quantum dot with an Aharonov-Bohm flux through the hole of the ring. The Coulomb blockade leads to persistent current peaks at values of the gate voltage at which two charge states of the dot have the same free energy. We couple the structure ...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2007
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2007.08.056