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CERN Document Server Намерени са 3 записа  Търсенето отне 1.12 секунди. 
1.
Probing homogeneity with standard candles / Chiang, Hsu Wen (Taiwan, Natl. Taiwan U.) ; Romano, Antonio Enea (CERN ; Antioquia U. ; Bishop's U., Sherbrooke) ; Nugier, Fabien (Taiwan, Natl. Taiwan U.) ; Chen, Pisin (Taiwan, Natl. Taiwan U. ; KIPAC, Menlo Park)
We show that standard candles can provide some valuable information about the density contrast, which could be particularly important at redshifts where other observations are not available. We use an inversion method to reconstruct the local radial density profile from luminosity distance observations assuming background cosmological parameters obtained from large scale observations. [...]
arXiv:1706.09734.- 2019-11-14 - 47 p. - Published in : JCAP 1911 (2019) 016 Fulltext: arXiv:1706.09734 - PDF; 1706.09734 - PDF;
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2.
The second-order luminosity-redshift relation in a generic inhomogeneous cosmology / Ben-Dayan, Ido (Canadian Inst. Theor. Astrophys. ; Perimeter Inst. Theor. Phys.) ; Marozzi, Giovanni (College de France ; Geneva U., Dept. Theor. Phys. ; Geneva U., CAP) ; Nugier, Fabien (Ecole Normale Superieure) ; Veneziano, Gabriele (College de France ; CERN)
After recalling a general non-perturbative expression for the luminosity-redshift relation holding in a recently proposed "geodesic light-cone" gauge, we show how it can be transformed to phenomenologically more convenient gauges in which cosmological perturbation theory is better understood. We present, in particular, the complete result on the luminosity-redshift relation in the Poisson gauge up to second order for a fairly generic perturbed cosmology, assuming that appreciable vector and tensor perturbations are only generated at second order. [...]
arXiv:1209.4326; CERN-PH-TH-2012-225; CERN-PH-TH-2012-225.- 2012 - 18 p. - Published in : JCAP 11 (2012) 045 Fulltext: PDF; IOP Open Access article: PDF; External link: Preprint
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3.
Do stochastic inhomogeneities affect dark-energy precision measurements? / Ben-Dayan, Ido (Canadian Inst. Theor. Astrophys. ; Perimeter Inst. Theor. Phys.) ; Gasperini, Maurizio (Bari U. ; INFN, Bari) ; Marozzi, Giovanni (College de France) ; Nugier, Fabien (Ecole Normale Superieure) ; Veneziano, Gabriele (College de France ; CERN)
The effect of a stochastic background of cosmological perturbations on the luminosity-redshift relation is computed to second order through a recently proposed covariant and gauge-invariant light-cone averaging procedure. The resulting expressions are free from both ultraviolet and infrared divergences, implying that such perturbations cannot mimic a sizable fraction of dark energy. [...]
arXiv:1207.1286; CERN-PH-TH-2012-188.- 2013 - 5 p. - Published in : Phys. Rev. Lett. 110 (2013) 021301 APS Published version, local copy: PDF; Fulltext: PDF; External link: Preprint
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3 Nugier, F.
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