%0 Journal Article
%@ 2190-5444
%A  Racskó Bence
%A  Gergely László Á.
%A Holografikus kvantumtérelmélet ”Lendület”  Kutatócsoport  Wigner FK / RMI / ELMO HKTELCS [2019-],
%A Elméleti Fizikai Tanszék SZTE / TTIK / FI EFT [2016-],
%D 2023
%F publicatio:27276
%J EUROPEAN PHYSICAL JOURNAL PLUS
%N 5
%T Geometrical and physical interpretation of the Levi-Civita spacetime in terms of the Komar mass density
%U http://publicatio.bibl.u-szeged.hu/27276/
%V 138
%X We revisit the interpretation of the cylindrically symmetric, static vacuum Levi-Civita metric, known in either Weyl, Einstein–Rosen, or Kasner-like coordinates. The Komar mass density of the infinite axis source arises through a suitable compactification procedure. The Komar mass density \mu _{K} μ K calculated in Einstein–Rosen coordinates, when employed as the metric parameter, leads to a number of advantages. It eliminates double coverages of the parameter space, vanishes in flat spacetime and when small, it corresponds to the mass density of an infinite string. After a comprehensive analysis of the local and global geometry, we proceed with the physical interpretation of the Levi-Civita spacetime. First we show that the Newtonian gravitational force is attractive and its magnitude increases monotonically with all positive \mu _{K} μ K , asymptoting to the inverse of the proper distance in the radial direction. Second, we reveal that the tidal force between nearby geodesics (hence gravity in the Einsteinian sense) attains a maximum at \mu _{K}=1/2 μ K = 1 / 2 and then decreases asymptotically to zero. Hence, from a physical point of view the Komar mass density of the Levi-Civita spacetime encompasses two contributions: Newtonian gravity and acceleration effects. An increase in \mu _{K} μ K strengthens Newtonian gravity but also drags the field lines increasingly parallel, eventually transforming Newtonian gravity through the equivalence principle into a pure acceleration field and the Levi-Civita spacetime into a flat Rindler-like spacetime. In a geometric picture the increase of \mu _{K} μ K from zero to \infty ∞ deforms the planar sections of the spacetime into ever deepening funnels, eventually degenerating into cylindrical topology in an appropriately chosen embedding.