Bejarano Cecilia, Lobo Francisco S N, Olmo Gonzalo J, Rubiera-Garcia Diego
Instituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA), Casilla de Correo 67, Sucursal 28, 1428 Buenos Aires, Argentina.
Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC. Universidad de Valencia, Burjassot, 46100 Valencia, Spain.
Eur Phys J C Part Fields. 2017;77(11):776. doi: 10.1140/epjc/s10052-017-5353-0. Epub 2017 Nov 18.
Wormholes are hypothetical shortcuts in spacetime that in general relativity unavoidably violate all of the pointwise energy conditions. In this paper, we consider several wormhole spacetimes that, as opposed to the standard procedure frequently employed in the literature, arise directly from gravitational actions including additional terms resulting from contractions of the Ricci tensor with the metric, and which are formulated assuming independence between metric and connection (Palatini approach). We reinterpret such wormhole solutions under the prism of General Relativity and study the matter sources that thread them. We discuss the size of violation of the energy conditions in different cases and how this is related to the same spacetimes when viewed from the modified gravity side.
虫洞是时空中的假设性捷径，在广义相对论中不可避免地违反所有逐点能量条件。在本文中，我们考虑了几种虫洞时空，与文献中经常采用的标准程序不同，这些时空直接源于引力作用，包括里奇张量与度规收缩产生的附加项，并且是在假设度规与联络相互独立的情况下（帕拉蒂尼方法）构建的。我们在广义相对论的框架下重新解释这些虫洞解，并研究贯穿它们的物质源。我们讨论了不同情况下能量条件的违反程度，以及从修正引力的角度来看，这与相同时空是如何相关的。
