Strategies to ascertain the sign of the spatial curvature

Ferreira, Pedro da Cunha; Pavón, Diego

Strategies to ascertain the sign of the spatial curvature

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dc.contributor.author	Ferreira, Pedro da Cunha
dc.contributor.author	Pavón, Diego
dc.date.accessioned	2021-01-20T18:32:17Z
dc.date.available	2021-01-20T18:32:17Z
dc.date.issued	2016-11-24
dc.description.resumo	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. Based on this, we study the connection between the deceleration parameter and the spatial curvature of the metric, Wk, and set limits on the latter, valid for any homogeneous and isotropic cosmological model. Likewise, we devise strategies to determine the sign of the spatial curvature index k. Finally, assuming the lambda cold dark matter model is correct, we find that the acceleration of the cosmic expansion is increasing today	pt_BR
dc.identifier.citation	FERREIRA, Pedro da CUNHA; PAVÓN, Diego. Strategies to Ascertain the Sign of the Spatial Curvature. Universe, [S.L.], v. 2, n. 4, p. 27-27, 24 nov. 2016. MDPI AG. Disponível em: https://www.mdpi.com/2218-1997/2/4/27. Acesso em: 27 nov. 2020. DOI: 10.3390/universe2040027	pt_BR
dc.identifier.doi	10.3390/universe2040027
dc.identifier.issn	2218-1997
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/31298
dc.language	en	pt_BR
dc.publisher	MDPI	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Mathematical cosmology	pt_BR
dc.subject	Spatial curvatur	pt_BR
dc.subject	Thermodynamics	pt_BR
dc.title	Strategies to ascertain the sign of the spatial curvature	pt_BR
dc.type	article	pt_BR