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pro vyhledávání: '"Alberti, Giuseppe"'
Autor:
Alberti, Giuseppe
The possibility of modeling and therefore predicting the trend of demographic mortality is of great scientific and social interest. The article presents and discusses the hypothesis that the demographic distribution of mortality in advanced ages conv
Externí odkaz:
http://arxiv.org/abs/2307.10279
Autor:
Alberti, Giuseppe
The paper presents a recursive function able to mimic demographic mortality curves. This function is not a fitting algorithm and depends only from one parameter that has a precise meaning in a cellular automaton model. This model is also presented. F
Externí odkaz:
http://arxiv.org/abs/2205.12989
Autor:
Alberti, Giuseppe
La mécanique statistique des systèmes auto-gravitants constitue un des plus fascinants et mystérieux champs de recherche. À cause de la nature à longue-portée de la force gravitationnelle, la notion usuelle d'équilibre statistique est modifié
Externí odkaz:
http://www.theses.fr/2017TOU30309/document
Publikováno v:
Phys. Rev. E 101, 052105 (2020)
We determine the caloric curves of classical self-gravitating systems at statistical equilibrium in general relativity. In the classical limit, the caloric curves of a self-gravitating gas depend on a unique parameter $\nu=GNm/Rc^2$, called the compa
Externí odkaz:
http://arxiv.org/abs/1908.10316
Gravitational phase transitions and instabilities of self-gravitating fermions in general relativity
Publikováno v:
Physics Letters B 801, 135155 (2020)
We discuss the occurrence of gravitational phase transitions and instabilities in a gas of self-gravitating fermions within the framework of general relativity. In the classical (nondegenerate) limit, the system undergoes a gravitational collapse at
Externí odkaz:
http://arxiv.org/abs/1908.10303
Autor:
Alberti, Giuseppe
Publikováno v:
The Fifteenth Marcel Grossmann Meeting, pp. 1298-1303 (2022)
We study the dynamical stability of self-gravitating systems in presence of anisotropy. In particular, we introduce a stability criterion, in terms of the adiabatic local index, that generalizes the stability condition $<\gamma> \geq 4/3$ of the isot
Externí odkaz:
http://arxiv.org/abs/1902.04852
Publikováno v:
The Fifteenth Marcel Grossmann Meeting, pp. 1304-1309 (2022)
The Thomas-Fermi model is extended at finite temperature, to describe the gravitational phase transition occurring in massive fermionic systems in a general-relativistic framework. It is shown that, when a nondegenerate fermionic gas (for $N < N_{OV}
Externí odkaz:
http://arxiv.org/abs/1902.04854
Akademický článek
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Publikováno v:
Eur. Phys. J. B 93, 208 (2020)
We study the nature of phase transitions between gaseous and condensed states in the self-gravitating Fermi gas at nonzero temperature in general relativity. The condensed states can represent compact objects such as white dwarfs, neutron stars, or d
Externí odkaz:
http://arxiv.org/abs/1808.01007
Akademický článek
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