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Depósito Digital de Documentos de la UAB Encontrados 9 registros  La búsqueda tardó 0.01 segundos. 
1.
11 p, 301.0 KB Periodic Orbits of Quantised Restricted Three-Body Problem / Abouelmagd, Elbaz I. (National Research Institute of Astronomy and Geophysics . Astronomy Department) ; Guirao, Juan Luis Garcia (Universidad Politécnica de Cartagena. Departamento de Matemáticas) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this paper, perturbed third-body motion is considered under quantum corrections to analyse the existence of periodic orbits. These orbits are studied through two approaches to identify the first (second) periodic-orbit types. [...]
2023 - 10.3390/universe9030149
Universe, Vol. 9, Issue 3 (March 2023) , art. 149  
Registro completo - Creative Commons
2.
Global dynamics of the Hořava-Lifshitz cosmology in the presence of non-zero cosmological constant in a flat space / Gao, Fabao (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
Using the qualitative theory of differential equations, the global dynamics of a cosmological model based on Hořava-Lifshitz gravity is studied in the space with zero curvature in the presence of the non-zero cosmological constant. [...]
2022 - 10.1016/j.dark.2022.101139
Physics of the Dark Universe, Vol. 38 (December 2022) , art. 101139  
Registro completo - Creative Commons
3.
23 p, 1.1 MB The Effect of Age on the Grouping of Open Clusters : II. Are There Old Binary Clusters? / Casado, J. (Universitat Autònoma de Barcelona. Departament de Química)
In the present study, we continue testing the Primordial Group hypothesis (Casado 2022), which postulates that only sufficiently young open clusters can be binary or multiple, and old clusters are essentially single. [...]
2022 - 10.3390/universe8070368
Universe, Vol. 8 Núm. 7 (July 2022) , art. 368  
Registro completo - Creative Commons
4.
9 p, 278.0 KB Global dynamics for the Szekeres system with non-zero cosmological constant / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade de Lisboa. Instituto Superior Técnico. Departamento de Matemàtica)
The Szekeres system with cosmological constant term describes the evolution of the kinematic quantities for the Einstein field equations in dimension four. It is a Hamiltonian system (with Hamiltonian H). [...]
2022 - 10.1016/j.dark.2022.100954
Physics of the Dark Universe, Vol. 35 (March 2022) , art. 100954  
Registro completo - Creative Commons
5.
50 p, 1.4 MB Global dynamics of the Hořava-Lifshitz cosmological model in a non-flat universe with non-zero cosmological constant / Gao, Fabao (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
When the cosmological constant is non-zero, the dynamics of the cosmological model based on Hořava-Lifshitz gravity in a non-flat universe are characterized by using the qualitative theory of differential equations.
2021 - 10.3390/universe7110445
Universe, Vol. 7, Issue 11 (November 2021) , art. 445
2 documentos
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6.
24 p, 1.6 MB The Effect of Age on the Grouping of Open Clusters : the Primordial Group Hypothesis / Casado Giménez, Juan (Universitat Autònoma de Barcelona. Departament de Química)
The Primordial Group hypothesis states that only sufficiently young open clusters (OCs) can be multiple, and old OCs are essentially isolated. We tested this postulate through four different studies using a manual search of Gaia EDR3 and extensive literature. [...]
2022 - 10.3390/universe8020113
Universe, Vol. 8, Issue 2 (February 2022) , art. 113  
Registro completo - Creative Commons
7.
22 p, 6.4 MB Bifurcation analysis and periodic solutions of the HD 191408 system with triaxial and radiative perturbations / Gao, Fabao (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Wang, Ruifang (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
The nonlinear orbital dynamics of a class of the perturbed restricted three-bodyproblemis studied. The two primaries considered here refer to the binary system HD 191408. The third particle moves under the gravity of the binary system, whose triaxial rate and radiation factor are also considered. [...]
2020 - 10.3390/universe6020035
Universe, Vol. 6, Issue 2 (February 2020) , art. 35  
Registro completo - Creative Commons
8.
25 p, 24.1 MB Approximate Analytical Periodic Solutions to the Restricted Three-Body Problem with Perturbation, Oblateness, Radiation and Varying Mass / Gao, Fabao (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Wang, Yongqing (Yangzhou University. School of Mathematical Science)
Against the background of a restricted three-body problem consisting of a supergiant eclipsing binary system, the two primaries are composed of a pair of bright oblate stars whose mass changes with time. [...]
2020 - 10.3390/universe6080110
Universe, Vol. 6, Núm. 8 (August 2020) , art. 110  
Registro completo - Creative Commons
9.
10 p, 449.9 KB Strategies to Ascertain the Sign of the Spatial Curvature / Ferreira, Pedro C. (Universidade Federal do Rio Grande do Norte. Escola de Ciências e Tecnologia) ; Pavón Coloma, Diego (Universitat Autònoma de Barcelona. Departament de Física)
The second law of thermodynamics, in the presence of gravity, is known to hold at small scales, as in the case of black holes and self-gravitating radiation spheres. Using the Friedmann-Lemaître-Robertson-Walker metric and the history of the Hubble factor, we argue that this law also holds at cosmological scales. [...]
2016 - 10.3390/universe2040027
Universe, Vol. 2 Núm. 4 (November 2016) , p. 1-10  
Registro completo - Creative Commons

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