Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Emmanuel Frion"'
Publikováno v:
The Open Journal of Astrophysics, Vol 7 (2024)
We investigate primordial magnetogenesis within a quantum bouncing model driven by a scalar field, focusing on various non-minimal couplings between the electromagnetic field and the scalar field. We test three cases: no coupling, a Cauchy coupling w
Externí odkaz:
https://doaj.org/article/344e3c6f478e419291a95f8007b5aa8e
Autor:
Emmanuel Frion, David Camarena, Leonardo Giani, Tays Miranda, Daniele Bertacca, Valerio Marra, Oliver F. Piattella
Publikováno v:
The Open Journal of Astrophysics, Vol 7 (2024)
Externí odkaz:
https://doaj.org/article/c9251bc67c2c45b893f47a8c41006e73
Publikováno v:
Acta Polytechnica, Vol 62, Iss 1, Pp 8-15 (2022)
The real plane with its set of orientations or angles in [0, π) is the simplest non trivial example of a (projective) Hilbert space and provides nice illustrations of quantum formalism. We present some of them, namely covariant integral quantization
Externí odkaz:
https://doaj.org/article/2882bb2f0ff44729bd2a42003e5cca08
Publikováno v:
The Open Journal of Astrophysics, Vol 4 (2021)
The apparent angular size of the shadow of a black hole in an expanding Universe is redshift-dependent. Since cosmological redshifts change with time - known as the redshift drift - all redshift-dependent quantities acquire a time dependence, and _a
Externí odkaz:
https://doaj.org/article/c5fcc8918b1a498e9e7dcd41b3a83975
Publikováno v:
Annals Phys.
Annals Phys., 2022, 447, pp.169134. ⟨10.1016/j.aop.2022.169134⟩
Annals Phys., 2022, 447, pp.169134. ⟨10.1016/j.aop.2022.169134⟩
We investigate two aspects of the elementary example of POVMs on the Euclidean plane, namely their status as quantum observables and their role as quantizers in the integral quantization procedure. The compatibility of POVMs in the ensuing quantum fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4e0f7bf3bbbdb476866ef975ec99d2b
http://arxiv.org/abs/2108.04086
http://arxiv.org/abs/2108.04086
Publikováno v:
Acta Polytech.
Acta Polytech., 2022, 62 (1), pp.8-15. ⟨10.14311/AP.2022.62.0008⟩
Acta Polytech., 2022, 62 (1), pp.8-15. ⟨10.14311/AP.2022.62.0008⟩
The real plane with its set of orientations or angles in $[0,\pi)$ is the simplest non trivial example of a (projective) Hilbert space and provides nice illustrations of quantum formalism. We present some of them, namely covariant integral quantizati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::224915c695bcccffbf569b5be4353663
We study how the evolution of a Dark Energy Quintessence fluid is modified by the presence of a matter inhomogeneity. To do so, we study linear perturbations of a flat FLRW background containing dust and a slowly rolling scalar field. Under the assum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b40388f241e43e0a4d0eb311c8dc78df
We investigate primordial magnetogenesis and the evolution of the electromagnetic field through a quantum bounce, in a model that starts in the far past from a contracting phase where only dust is present and the electromagnetic field is in the adiab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae2e7a5bbed87986b2f43652c3fe0261
Autor:
Leonardo Giani, Emmanuel Frion
Strong lensing time delay measurements provide a valuable and almost model-independent tool for cosmological investigations. In this work we recognize that they also carry information on the strength of the gravitational coupling at the redshift of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4ff02598954461b869f71295037262c
Publikováno v:
Miranda, T, Frion, E & Wands, D 2020, ' Stochastic collapse ', Journal of Cosmology and Astroparticle Physics, vol. 2020, no. 01, 026 . https://doi.org/10.1088/1475-7516/2020/01/026
We investigate cosmological models described by a scalar field with an exponential potential, and apply the stochastic formalism, which allows us to study how quantum field fluctuations give rise to stochastic noise. This modifies the classical dynam
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba782bcd75cbfd028100501b6a4d10aa
https://doi.org/10.1088/1475-7516/2020/01/026
https://doi.org/10.1088/1475-7516/2020/01/026