Bibliografías temáticas / Friedmann-Robertson-Walker background equations

Literatura académica sobre el tema "Friedmann-Robertson-Walker background equations"

Autor: Grafiati

Publicado: 14 de marzo de 2023

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros

Elija tipo de fuente:

Índice

Artículos de revistas
Capítulos de libros

Consulte las listas temáticas de artículos, libros, tesis, actas de conferencias y otras fuentes académicas sobre el tema "Friedmann-Robertson-Walker background equations".

Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.

También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.

Artículos de revistas sobre el tema "Friedmann-Robertson-Walker background equations"

Shchigolev, Victor. "An approximate solution of the Yang - Mills equation on a spatially flat FRW cosmological background". International Journal of Physical Research 7, n.º 2 (21 de septiembre de 2019): 100. http://dx.doi.org/10.14419/ijpr.v7i2.29775.

Texto completo

Resumen

In this paper, an approximate solution for the Yang - Mills equation in a spatially flat Friedmann-Robertson-Walker universe is obtained. For this purpose, the well known method of solution of non-linear differential equations is used, viz. the homotopy perturbations method. This method has been developed as effective technique for solving different non-linear problems. Here, this method allowed us to obtain approximate solution for the essentially non-linear equation for the SO3 Yang-Mills fields on the curved space-time background of the spatially flat Friedmann-Robertson-Walker universe.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Liu, Jianwen, Ruifang Wang y Fabao Gao. "Dynamics of a Cosmological Model in f(R,T) Gravity: I. On Invariant Planes". Universe 8, n.º 7 (3 de julio de 2022): 365. http://dx.doi.org/10.3390/universe8070365.

Texto completo

Resumen

Under the background of perfect fluid and flat Friedmann–Lemaître–Robertson–Walker (FLRW) space-time, this paper mainly describes the dynamics of the cosmological model constructed in f(R,T) gravity on three invariant planes, by using the singularity theory and Poincaré compactification in differential equations.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Paliathanasis, Andronikos. "Painlevé Analysis of the Cosmological Field Equations in Weyl Integrable Spacetime". Universe 8, n.º 7 (23 de junio de 2022): 345. http://dx.doi.org/10.3390/universe8070345.

Texto completo

Resumen

We apply a singularity analysis to investigate the integrability properties of the gravitational field equations in Weyl Integrable Spacetime for a spatially flat Friedmann–Lemaître–Robertson–Walker background spacetime induced by an ideal gas. We find that the field equations possess the Painlevé property in the presence of the cosmological constant, and the analytic solution is given by a left Laurent expansion.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Coley, A. A. y B. O. J. Tupper. "Two-fluid Friedmann–Robertson–Walker cosmologies and their numerical predictions". Canadian Journal of Physics 64, n.º 2 (1 de febrero de 1986): 204–9. http://dx.doi.org/10.1139/p86-036.

Texto completo

Resumen

Friedmann–Robertson–Walker models satisfying the Einstein field equations for a combination of two fluids, one of which is a comoving perfect fluid with the radiation equation of state [Formula: see text], representing the cosmic microwave background, are discussed. Existing models, in which the second fluid is a comoving perfect fluid, are reviewed and their numerical predictions calculated. These models are generalized by considering the case in which the second fluid is an imperfect fluid. This fluid is necessarily noncomoving, the tilt representing the motion of the local supercluster of galaxies relative to the cosmic microwave background. The numerical predictions of one such model are calculated and are found to be in excellent agreement with observation.

Los estilos APA, Harvard, Vancouver, ISO, etc.

LAHIRI, JOYDEV y GAUTAM BHATTACHARYA. "A COVARIANT APPROACH TO THE GENERALIZED MULTI-INFLATON COSMOLOGICAL PERTURBATION". International Journal of Modern Physics A 24, n.º 20n21 (20 de agosto de 2009): 3893–916. http://dx.doi.org/10.1142/s0217751x09044231.

Texto completo

Resumen

Following the formalism developed in Astrophys. J.375, 443 (1991), differential equations for the gauge invariant scalar part of the metric perturbation in the Friedmann–Robertson–Walker background with multiple inflatons with arbitrary field metric are obtained without any specific choice of gauge. Subsequently, an algorithm for the solution of these equations in the slow-roll approximation is given without any prior choice of the basis system in the field manifold. Vector and tensor perturbations are also briefly reviewed.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Amani, Ali R. "The bouncing cosmology with F(R) gravity and its reconstructing". International Journal of Modern Physics D 25, n.º 06 (mayo de 2016): 1650071. http://dx.doi.org/10.1142/s0218271816500711.

Texto completo

Resumen

In this paper, we study [Formula: see text] gravity by Hu–Sawicki model in Friedmann–Lemaître–Robertson–Walker (FLRW) background. The Friedmann equations are calculated by modified gravity action, and then the obtained Friedmann equations are written in terms of standard Friedmann equations. Next, the behavior of bouncing cosmology is investigated in the modified gravity model, i.e. this behavior can solve the problem of nonsingularity in standard big bang cosmology. We plot the cosmological parameters in terms of cosmic time and then the bouncing condition is investigated. In what follows, we reconstruct the modified gravity by redshift parameter, and also graphs of cosmological parameters are plotted in terms of redshift, in which the figures show us an accelerated expansion of universe. Finally, the stability of the scenario is investigated by a function as sound speed, and the graph of sound speed versus redshift shows us that there is the stability in late-time.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Yılmaz, Nejat Tevfik. "Effective fluid FLRW cosmologies of minimal massive gravity". Modern Physics Letters A 30, n.º 18 (25 de mayo de 2015): 1550087. http://dx.doi.org/10.1142/s021773231550087x.

Texto completo

Resumen

By using a solution ansatz we partially decouple the metric and the Stückelberg sectors of the minimal massive gravity (MMGR). In this scheme for a diagonal physical metric we find the general solutions for the scalars of the theory and the particular fiducial (background) metric which leads to these solutions. Then we adopt this general formalism to construct the derivation of new Friedmann–Lemaitre–Robertson–Walker (FLRW) cosmologies of the theory in the presence of a so-called effective ideal fluid which arises from our solution ansatz as a modifying, non-physical source for the Einstein and the corresponding Friedmann equations.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Pal, Subhajyoti, Sudip Mishra y Subenoy Chakraborty. "Dynamical system analysis of a nonminimally coupled scalar field". International Journal of Modern Physics D 28, n.º 15 (noviembre de 2019): 1950173. http://dx.doi.org/10.1142/s0218271819501736.

Texto completo

Resumen

This paper deals with a nonminimally coupled scalar field in the background of homogeneous and isotropic Friedmann–Lemaître–Robertson–Walker (FLRW) flat spacetime. As Einstein field equations are coupled second-order nonlinear differential equations, it is very hard to find exact solutions. By suitable choice of variables, we transform Einstein field equations to an autonomous system and critical points are determined. We use center manifold theory to characterize nonhyperbolic critical points and are found to be saddle in nature. We discuss possible bifurcation scenarios, which indicate the existence of the cosmological bouncing model.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Paliathanasis, Andronikos y Genly Leon. "Cosmological solutions in Hořava-Lifshitz scalar field theory". Zeitschrift für Naturforschung A 75, n.º 6 (26 de mayo de 2020): 523–32. http://dx.doi.org/10.1515/zna-2020-0003.

Texto completo

Resumen

AbstractWe perform a detailed study of the integrability of the Hořava-Lifshitz scalar field cosmology in a Friedmann-Lemaître-Robertson-Walker background space-time. The approach we follow to determine the integrability is that of singularity analysis. More specifically, we test whether the gravitational field equations possess the Painlevé property. For the exponential potential of the scalar field, we are able to perform an analytic explicit integration of the field equations and write the solution in terms of a Laurent expansion and more specifically write the solution in terms of right Painlevé series.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Dutta, Malay Krishna y B. Modak. "Can Noether symmetry in modified f(G) gravity always yield cosmic evolution?" Modern Physics Letters A 32, n.º 11 (7 de abril de 2017): 1750046. http://dx.doi.org/10.1142/s0217732317500468.

Texto completo

Resumen

We discuss Noether symmetry approach in the modified theory of gravity with Gauss–Bonnet (GB) interaction-f(G) including an ideal fluid in Friedmann–Lemaître–Robertson–Walker (FLRW) background. It yields functional form of f(G) from the symmetry. The existence of Noether symmetry gives the scale factor in two cases, but these are not satisfied by field equations in general. In another case, the solution of field equations shows late-time transition to an accelerating expansion when matter is dust, however the solution including dust and radiation is always in accelerating era.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Más fuentes

Capítulos de libros sobre el tema "Friedmann-Robertson-Walker background equations"

Carlip, Steven. "Cosmology". En General Relativity, 92–100. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198822158.003.0011.

Texto completo

Resumen

Starting with the assumptions of homogeneity and isotropy, the cosmological solutions of the Einstein field equations—the Friedmann-Lemaitre-Robertson-Walker metrics—are derived. After a discussion of constant curvature metrics and the topology of the Universe, the chapter moves on to discuss observational implications: expansion of the Universe, cosmological red shift, primordial nucleosynthesis, the cosmic microwave background, and primordial perturbations. The chapter includes a brief discussion of de Sitter and anti-de Sitter space and an introduction to inflation.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Ofrecemos descuentos en todos los planes premium para autores cuyas obras están incluidas en selecciones literarias temáticas. ¡Contáctenos para obtener un código promocional único!