Buona crescita, cattiva immunità

Grasso, A.

doi:10.53126/mebxxiv257

Cited by 2 publications

(7 citation statements)

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“…11: Variations ∆D ang (Lin, N) and ∆D ang (PN, N), as defined in Eq. ( 29), on different scales in the range [30,500] Mpc. The amplitudes monotonically decrease as the scale k becomes smaller.…”

Section: Resultsmentioning

confidence: 99%

“…BiGONLight.m works as an independent package that, once is called by a Mathematica notebook, can be used to compute numerically the BGO along the line of sight, given the spacetime metric, the four-velocities and accelerations of source and observer as inputs: a sample of the notebook we used for our analysis can be found in the repository folder Plane-parallel. An exhaustive description of BiGONLight and several tests of the package are presented in [30]. Here we just report in App.…”

Section: Methodsmentioning

confidence: 99%

“…A short description of the package is given in App. A here and we will give a more extensive discussion on BiGONLight in [30]. In the present work we focus on two observables in the cosmological context: redshift and angular diameter distance.…”

Section: Fig 12mentioning

confidence: 99%

“…We devote a companion paper, [30], to the comprehensive description of the modules of package, including also benchmark testing performed in the context of several exact and simulated cosmological models and addressing more obsevables than in the present work. In the rest of this appendix, we report the tests for the angular diameter distance only in the well-known ΛCDM and Szekeres models.…”

Section: Fig 13mentioning

confidence: 99%

“…Besides, an important novelty of this work is that we make use of the new BiGONLight Mathematica package to study light propagation in GR and compute observables numerically, [30]. Contrary to other software, BiGONLight implements light propagation within the new Bi-local Geodesic Operator (BGO) framework, which is applicable to more general situations than the standard formalism and it is also suitable to construct new observables, [31,32].…”

Section: Introductionmentioning

confidence: 99%

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Isolating non-linearities of light propagation in inhomogeneous cosmologies

Grasso,

Villa,

Korzyński

et al. 2021

Preprint

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A new formulation for light propagation in geometric optics by means of the Bi-local Geodesic Operators is considered. We develop the BiGONLight Mathematica package, uniquely designed to apply this framework to compute optical observables in Numerical Relativity. Our package can be used for light propagation on a wide range of scales and redshifts and accepts numerical as well as analytical input for the spacetime metric. In this paper we focus on two cosmological observables, the redshift and the angular diameter distance, specializing our analysis to a wall universe modeled within the post-Newtonian approximation. With this choice and the input metric in analytical form, we are able to estimate non-linearities of light propagation by comparing and isolating the contributions coming from Newtonian and post-Newtonian approximations as opposed to linear perturbation theory. We also clarify the role of the dominant post-Newtonian contribution represented by the linear initial seed which, strictly speaking, is absent in the Newtonian treatment. We found that post-Newtonian non-linear corrections are below 1%, in agreement with previous results in the literature.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Fig 12mentioning

confidence: 99%

Section: Fig 13mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Isolating non-linearities of light propagation in inhomogeneous cosmologies

Grasso,

Villa,

Korzyński

et al. 2021

Preprint

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Super partes? Ideological leaning of heads of state and their distance from prime ministers

Cerón

2023

Contemporary Italian Politics

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Presidents in parliamentary democracies are commonly perceived as neutral actors, with limited influence on everyday politics. However, Italian Heads of State have the widest set of powers among European parliamentary democracies. Recent episodes occurred during the presidential terms of Giorgio Napolitano and Sergio Mattarella suggest that Heads of State can indeed play a political role, influencing cabinet formation and everyday politics. This paper examines whether the Head of State can be considered as a non-partisan political actor or, to the contrary, his ideological leaning can be detected from public speeches and declarations. By collecting and analysing a new and original dataset, based on the content analysis of Presidents' investiture speeches and New Year's Eve messages, we mapped the political position of Italian Heads of State over 76 years . As such, the paper investigates under which conditions the position of the President is closer to that of the Prime Minister on the ideological left-right scale and on foreign policy. The analysis reveal that their ideological distance is lower when both belong to the same ideological party family and when the Prime Minister has been appointed to form a President's cabinet, closer to the preferences of the Head of State.

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Buona crescita, cattiva immunità

Abstract: The author presents a case of common variable immunodeficiency due to adenosine deaminase 1 deficiency diagnosed in a 3-year-old girl with recurrent pneumonia slowly respondent to the antibiotic therapy.

Cited by 2 publications

References 0 publications

Isolating non-linearities of light propagation in inhomogeneous cosmologies

Isolating non-linearities of light propagation in inhomogeneous cosmologies

Super partes? Ideological leaning of heads of state and their distance from prime ministers

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