79 research outputs found
NUT charge in linearized infinite derivative gravity
We study the gravitational field of the NUT-like source in the linearized
(ghost-free) infinite derivative gravity. Such a source is equivalent to the
spinning semi-infinite cosmic string with no tension. In general relativity,
the linearized (massless) Taub-NUT solution has a curvature singularity as well
as a topological defect corresponding to distributional curvature on one half
of the symmetry axis called the Misner string. We find the NUT-charged
spacetime in the linearized infinite derivative gravity. We show that it is
free from curvature singularities as well as Misner strings. We also discuss an
asymptotic limit along the symmetry axis that leads to the spacetime of a
spinning cosmic string of infinite length.Comment: 10 pages, 4 figure
Impulsive waves in ghost-free infinite derivative gravity in anti-de Sitter spacetime
We study exact impulsive gravitational waves propagating in anti-de Sitter
spacetime in the context of the ghost free infinite derivative gravity. We show
that the source-free theory does not admit any AdS wave solutions other than
that of Einstein's general relativity. The situation is significantly different
in the presence of sources. We construct impulsive-wave solutions of the
infinite derivative gravity generated by massless particles and linear sources
in four and three dimensions. The singularities corresponding to distributional
curvature at the locations of the sources get smeared by the non-localities.
The obtained solutions are regular everywhere. They reduce to the corresponding
solutions of general relativity in the infrared regime and in the local limit.Comment: 9 pages, 5 figures, minor corrections and references added, Published
in Phys.Rev.
Geodetska konsolidacija obradivih površina socijalističkih gazdinstava
Geodetska konsolidacija obradivih površina socijalističkih gazdinstava
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