Results 1 to 10 of about 23,671 (302)

Perturbations in Bianchi-V Spacetimes with Varying Λ, G and Viscous Fluids

open access: yesUniverse, 2023
As a follow-up of a recent article in which we investigated the cosmological background expansion history of the universe in Bianchi type-V cosmological models with bulk viscous fluid and evolving cosmological Λ and Newtonian G parameters, we study the ...
Amare Abebe   +4 more
doaj   +2 more sources

A Generalized Solution of Bianchi Type-V Models with Time-Dependent G and Λ [PDF]

open access: yesUniverse, 2018
We study the homogeneous but anisotropic Bianchi type-V cosmological model with time-dependent gravitational and cosmological “constants”. Exact solutions of the Einstein field equations (EFEs) are presented in terms of adjustable parameters ...
Alnadhief H. A. Alfedeel   +2 more
doaj   +3 more sources

Bianchi type–I Model with Time Varying Λ and G: The Generalized Solution [PDF]

open access: yesOpen Astronomy, 2020
In this paper, we have investigated the homogeneous and anisotropic Bianchi type–I cosmological model with a time-varying Newtonian and cosmological constant.
Alfedeel Alnadhief H. A.
doaj   +2 more sources

The evolution of time-dependent Λ and G in multi-fluid Bianchi type-I cosmological models

open access: yesOpen Astronomy, 2022
In this work, cosmological solutions based on the time-dependent cosmological (Λ\Lambda ) and Newtonian (GG) running “constants” in the Bianchi type-I spacetime are investigated vis-à-vis known cosmological data. The observationally known values of Ωm,Ωr{
Alfedeel Alnadhief H. A., Abebe Amare
doaj   +2 more sources

Speciale. Intorno alle "Lettere scelte" di G. Bianchi e A. Catani. Nota Editoriale [PDF]

open access: yesLaboratorio dell'ISPF, 2021
Editorial note presenting the special section dedicated to the Correspondence between G. Bianchi and A, Catani.
doaj   +1 more source

I marmi bianchi e colorati dalle caserme “G. Carreca” e “Ce.Ri.co” a Roma

open access: yesLanx, 2011
Questo lavoro si inserisce nell’ambito delle indagini archeologiche compiute tra il 2002 e il 2008 nell’area delle caserme “G. Carreca” e “Ce.Ri.co.”, in via Labicana a Roma.
Marco Viglietti
doaj   +2 more sources

Restrictions on sets of conjugacy class sizes in arithmetic progressions [PDF]

open access: yesInternational Journal of Group Theory, 2023
We continue the investigation, that began in [M. Bianchi, A. Gillio and P. P. Pálfy, A note on finite groups in which the conjugacy class sizes form an arithmetic progression, Ischia group theory 2010, World Sci. Publ., Hackensack, NJ (2012) 20--25.] and
Alan R. Camina, Rachel D. Camina
doaj   +1 more source

Da Napoli a Rimini: i corrispondenti di Giovanni Bianchi [PDF]

open access: yesLaboratorio dell'ISPF, 2021
Since his first trip to Naples in 1726, Giovanni Bianchi maintains correspondence with the Neapolitan intellectual environment. The sending of his printed works to Francesco Vargas Macciucca and his acquaintances extends the chain of Neapolitan ...
Flavia Luise
doaj   +1 more source

Libri di antiquaria nella corrispondenza tra Giovanni Bianchi e Alessandro Catani [PDF]

open access: yesLaboratorio dell'ISPF, 2021
In the correspondence between Giovanni Bianchi and Alessandro Catani, the two correspondents combine the editorial reports of a scientific literature, suited to their medical profession, an antiquarian publishing line.
Vincenzo Trombetta
doaj   +1 more source

Giovanni Bianchi e la tradizione medico-naturalistica partenopea [PDF]

open access: yesLaboratorio dell'ISPF, 2021
From the recovered pieces of a scientific mosaic, scattered by G. Bianchi in the correspondence with A. Catani, it emerges the image of a Neapolitan medical republic and a lively "naturaliter lincea" capital city, heir to the late seventeenth-century ...
Oreste Trabucco
doaj   +1 more source

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