SCOAP3 Repository 7 records found  Search took 0.02 seconds. 
1. Blue and violet graviton spectra from a dynamical refractive index / Giovannini, Massimo
We show that the spectral energy distribution of relic gravitons mildly increases for frequencies smaller than the μHz and then flattens out whenever the refractive index of the tensor modes is dynamical during a quasi-de Sitter stage of expansion. [...]
Published in Physics letters B (2019) 10.1016/j.physletb.2018.12.068
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2. The propagating speed of relic gravitational waves and their refractive index during inflation / Giovannini, Massimo
If the refractive index of the tensor modes increases during a conventional inflationary stage of expansion the relic graviton spectrum is tilted towards high frequencies. [...]
Published in EPJC 78 (2018) 442 10.1140/epjc/s10052-018-5931-9
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3. Spectator electric fields, de Sitter spacetime, and the Schwinger effect / Giovannini, Massimo
During a de Sitter stage of expansion, the spectator fields of different spin are constrained by the critical density bound and by further requirements determined by their specific physical nature. [...]
Published in Phys. Rev. D 97 (2018) 10.1103/PhysRevD.97.061301 arXiv:1801.09995
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4. Effective horizons, junction conditions and large-scale magnetism / Giovannini, Massimo
The quantum mechanical generation of hypermagnetic and hyperlectric fields in four-dimensional conformally flat background geometries rests on the simultaneous continuity of the effective horizon and of the extrinsic curvature across the inflationary boundary. [...]
Published in EPJC 77 (2017) 522 10.1140/epjc/s10052-017-5105-1
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5. Tensor to scalar ratio from single field magnetogenesis / Giovannini, Massimo
The tensor to scalar ratio is affected by the evolution of the large-scale gauge fields potentially amplified during an inflationary stage of expansion. [...]
Published in Physics letters B (2017) 10.1016/j.physletb.2017.05.093
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6. The first observations of wide-band interferometers and the spectra of relic gravitons / Giovannini, Massimo
Stochastic backgrounds of relic gravitons of cosmological origin extend from frequencies of the order of the aHz up to the GHz range. [...]
Published in Physics letters B (2016) 10.1016/j.physletb.2016.06.020
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7. Uniform gradient expansions / Giovannini, Massimo
Cosmological singularities are often discussed by means of a gradient expansion that can also describe, during a quasi-de Sitter phase, the progressive suppression of curvature inhomogeneities. [...]
Published in Physics letters B 746 (2015) 159-163 10.1016/j.physletb.2015.04.071
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