Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Ismael Delgado"'
Persistent tensions in the $\Lambda$CDM cosmological model underline the importance of tests of its basic assumptions. One such potential test arises from the fact that the surface of zero expansion around the collapsing object with spherical symmetr
Externí odkaz:
http://arxiv.org/abs/2408.10699
Publikováno v:
Phys. Rev. D 109, 083525 (2024)
We develop a relativistic framework to investigate the evolution of cosmological structures from the initial density perturbations to the highly nonlinear regime. Our approach involves proposing a procedure to match ``best-fit", exact Bianchi IX (BIX
Externí odkaz:
http://arxiv.org/abs/2401.05810
We present numerical solutions to Einstein's equations describing large spherical cosmic voids constituted by two components; dark matter and baryons, with a non-vanishing initial relative velocity, in an asymptotically homogeneous background compati
Externí odkaz:
http://arxiv.org/abs/2306.02668
Publikováno v:
Phys. Rev. D 107, 024018 (2023)
We develop a new nonlinear method to model structure formation in general relativity from a generalization of the relativistic Lagrangian perturbation schemes, controlled by Szekeres (and LTB) exact solutions. The overall approach can be interpreted
Externí odkaz:
http://arxiv.org/abs/2210.04004
Publikováno v:
Universe 2022, 8, 583
The Newtonian Lagrangian perturbation theory is a widely used framework to study structure formation in cosmology in the nonlinear regime. We review a general-relativistic formulation of such a perturbation approach, emphasizing results on already de
Externí odkaz:
http://arxiv.org/abs/2209.13417
In many cosmological models, including the $\Lambda$CDM concordance model, there exist a theoretical upper bounds on the size of collapsing structures. The most common formulations in the literature refer to a turnaround radius in spherical symmetry
Externí odkaz:
http://arxiv.org/abs/2112.05245
Two recently published papers (J.D. Barrow and A. Paliathanasis, Eur. Phys. J. C. (2018, 2019)) claim to have found exact solutions of Einstein's field equations belonging to the class of non-trivial Szekeres models, whose source is a mixture of dust
Externí odkaz:
http://arxiv.org/abs/2103.06862
Publikováno v:
Phys. Rev. D 103, 023513 (2021)
We examine the relation between the Szekeres models and relativistic Lagrangian perturbation schemes, in particular the Relativistic Zel'dovich Approximation (RZA). We show that the second class of the Szekeres solutions is exactly contained within t
Externí odkaz:
http://arxiv.org/abs/2009.06339
Autor:
Ciro Ismael Delgado Sánchez, Milagros Mirella De la Cruz Rojas, David De la Cruz Montoya, Ana Isabel Correa Colonio, María Aurora Gonzales Vigo, Jamer Nórvil Mírez Toro, Jorge Luis Albarrán-Gil
Publikováno v:
Podium, Vol 18, Iss 3, Pp e1535-e1535 (2023)
La Educación Física, en la actualidad, presta cada vez más atención al desarrollo de estrategias pedagógicas, con la finalidad de perfeccionar los logros del aprendizaje y que este sea sostenible y enfrenta muchos retos de cómo acceder y manten
Externí odkaz:
https://doaj.org/article/fb7f16cd922f432f8459ea09757affdb
We examine the fully relativistic evolution of cosmic voids constituted by baryons and cold dark matter (CDM), represented by two non-comoving dust sources in a $\Lambda$CDM background. For this purpose, we consider numerical solutions of Einstein's
Externí odkaz:
http://arxiv.org/abs/1811.03634