COBE attitude refinement

Wright, E. L.; Kumar, V.; Freedman, I.; Rae, A.; Basappa, S.; Venkataraman, R.; Patt, Frederick S.

doi:10.1063/1.40444

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“…After the seminal discoveries of the COBE satellite [13] (later confirmed and extended by the WMAP experiment [14,15]) it became gradually clear that the early Universe itself could be seen, from the physical viewpoint, as an effective quantum amplifier. Consequently the applications of quantum optical techniques to the analysis of large-scale inhomogeneities has been firstly suggested by Grishchuk and collaborators in a class of problems involving the evolution of the tensor and scalar modes of the four-dimensional geometry [16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Squeezed relic photons beyond the horizon

Giovannini¹

2017

Phys. Rev. D

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Owing to the analogy with the ordinary photons in the visible range of the electromagnetic spectrum, the Glauber theory is generalized to address the quantum coherence of the gauge field fluctuations parametrically amplified during an inflationary stage of expansion. The first and second degrees of quantum coherence of relic photons are then computed beyond the effective horizon defined by the evolution of the susceptibility. In the zero-delay limit the Hanbury Brown-Twiss correlations exhibit a super-Poissonian statistics which is however different from the conventional results of the single-mode approximation customarily employed, in quantum optics, to classify the coherence properties of visible light. While in the case of large-scale curvature perturbations the degrees of quantum coherence coincide with the naive expectation of the single-mode approximation, the net degree of second-order coherence computed for the relic photons diminishes thanks to the effect of the polarizations. We suggest that the Hanbury Brown-twiss correlations are probably the only tool to assess the quantum or classical origin of the large-scale magnetic fluctuations and of the corresponding curvature perturbations.Comment: 33 pages. arXiv admin note: text overlap with arXiv:1608.0584

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Section: Introductionmentioning

confidence: 99%

Squeezed relic photons beyond the horizon

Giovannini¹

2017

Phys. Rev. D

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COBE attitude refinement

Cited by 1 publication

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Squeezed relic photons beyond the horizon

Squeezed relic photons beyond the horizon

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