Zobrazeno 1 - 10
of 93
pro vyhledávání: '"Livio Pizzocchero"'
Publikováno v:
Nuclear Physics B, Vol 957, Iss , Pp 115095- (2020)
We show that several integrable (i.e., exactly solvable) scalar cosmologies considered by Fré, Sagnotti and Sorin (Nuclear Physics B 877(3) (2013), 1028–1106) can be generalized to include cases where the spatial curvature is not zero and, besides
Externí odkaz:
https://doaj.org/article/16d71e8f99134ad6a248b9655f349f7d
Publikováno v:
Universe, Vol 5, Iss 3, p 76 (2019)
We discuss the particle horizon problem in the framework of spatially homogeneous and isotropic scalar cosmologies. To this purpose we consider a Friedmann–Lemaître–Robertson–Walker (FLRW) spacetime with possibly non-zero spatial sectional cur
Externí odkaz:
https://doaj.org/article/6570e3941e344e2d8a6da318a2e2f6f6
Autor:
Davide Fermi, Livio Pizzocchero
Publikováno v:
Symmetry, Vol 10, Iss 2, p 38 (2018)
The Casimir effect for a scalar field in presence of delta-type potentials has been investigated for a long time in the case of surface delta functions, modelling semi-transparent boundaries. More recently Albeverio, Cacciapuoti, Cognola, Spreafico a
Externí odkaz:
https://doaj.org/article/71a6a5d011d1449b915027f05a923238
Autor:
Carlo Morosi, Livio Pizzocchero
Publikováno v:
Journal of Function Spaces and Applications, Vol 2, Iss 3, Pp 279-321 (2004)
In the frame work of Sobolev (Bessel potential) spaces Hn(Rd,R or C), we consider the nonlinear Nemytskij operator sending a function x∈Rd↦f(x) into a composite function x∈Rd↦G(f(x),x). Assuming sufficient smoothness for G, we give a “tame
Externí odkaz:
https://doaj.org/article/f1b15d9528944b2dab64f813b4da529e
Publikováno v:
Applied Mathematics and Computation. 308:54-72
We give fully explicit upper and lower bounds for the constants in two known inequalities related to the quadratic nonlinearity of the incompressible (Euler or) NavierStokes equations on the torus Td. These inequalities are tame generalizations (in t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e69b9a2afb54d678f651566d39392ea7
https://doi.org/10.1016/j.amc.2017.02.054
https://doi.org/10.1016/j.amc.2017.02.054
Recently, there has been quite a lot of interest in static, spherical wormhole spacetimes and the question of their stability with respect to time-dependent perturbations. The consideration of linearized perturbations usually leads to a master wave e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4412d0709390a0dcbd3b573c3f1c315
Publikováno v:
Universe
Volume 5
Issue 3
Universe, Vol 5, Iss 3, p 76 (2019)
Volume 5
Issue 3
Universe, Vol 5, Iss 3, p 76 (2019)
We discuss the particle horizon problem in the framework of spatially homogeneous and isotropic scalar cosmologies. To this purpose we consider a Friedmann&ndash
Lemaî
tre&ndash
Robertson&ndash
Walker (FLRW) spacetime with po
Lemaî
tre&ndash
Robertson&ndash
Walker (FLRW) spacetime with po
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f85e54df381dcabcbfcf1228c91143bb
https://www.mdpi.com/2218-1997/5/3/76
https://www.mdpi.com/2218-1997/5/3/76
Autor:
Livio Pizzocchero
Publikováno v:
Applied Mathematics Letters. 115:106970
In Morosi and Pizzocchero (2015) and previous papers by the same authors, a general smooth setting was proposed for the incompressible Navier–Stokes (NS) Cauchy problem on a torus of any dimension d ⩾ 2 , and the a posteriori analysis of its appr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4898033882358a7333f9aecef6c64357
https://doi.org/10.1016/j.aml.2020.106970
https://doi.org/10.1016/j.aml.2020.106970
Autor:
Livio Pizzocchero, Emanuele Tassi
Publikováno v:
Nonlinear Analysis: Theory, Methods and Applications
Nonlinear Analysis: Theory, Methods and Applications, Elsevier, 2020, 195, pp.111726. ⟨10.1016/j.na.2019.111726⟩
Nonlinear Analysis: Theory, Methods and Applications, 2020, 195, pp.111726. ⟨10.1016/j.na.2019.111726⟩
Nonlinear Analysis: Theory, Methods and Applications, Elsevier, 2020, 195, pp.111726. ⟨10.1016/j.na.2019.111726⟩
Nonlinear Analysis: Theory, Methods and Applications, 2020, 195, pp.111726. ⟨10.1016/j.na.2019.111726⟩
Inspired by an approach proposed previously for the incompressible Navier-Stokes (NS) equations, we present a general framework for the a posteriori analysis of the equations of incompressible magnetohydrodynamics (MHD) on a torus of arbitrary dimens
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2345cc6590473693a9c8dabbdfb7f634
https://doi.org/10.1016/j.na.2019.111726
https://doi.org/10.1016/j.na.2019.111726
We consider the wormhole of Ellis, Bronnikov, Morris and Thorne (EBMT), arising from Einstein's equations in presence of a phantom scalar field. In this paper we propose a simplified derivation of the linear instability of this system, making compari
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da03012a617f88dbdef450940f7cc993
http://arxiv.org/abs/1805.02602
http://arxiv.org/abs/1805.02602