Astrophysical Wormholes

Abstract

Wormholes are hypothetical topologically-non-trivial structures of spacetime. From the theoretical point of view, the possibility of their existence is challenging but cannot be ruled out. This article is a compact and non-exhaustive review of past and current efforts to search for astrophysical wormholes in the Universe.

Constraining Wormhole Geometries using the Orbit of S2 Star and the Event Horizon Telescope

“…Geometrically, they are non-singular and traversable structures which admit a throat. The elusive WH geometry is supported by the Einstein's theory of general relativity (GR) being one of the exact solutions of Einstein field equations (see [1,2] for historical reference and reviews). Classically, the existence and stability of WH geometry requires the presence of negative energy density and the violation of the weak energy condition, however other approaches such as quantum gravity and quantum field theory in curved spacetime minimize such violations near the WH's throat.…”

Ultracompact stars with polynomial complexity by gravitational decoupling

“…All of these solutions are known as BH mimickers and correspond to objects that, given their high compactness, the motion of test particles around them seems indistinguishable when compared with the physics around a BH (see [6], for a recent review). Some examples of BH mimickers found in literature encompasses regular BH [7][8][9], a e-mail: econtreras@usfq.edu.ec (corresponding author) traversable wormholes [10][11][12][13] and ultracompact stars [14], among others, and in this work we shall focus our attention in the latter.…”

The eye of the storm: A regular Kerr black hole

“…Exploration regarding the extraction of astrophysical observables for nonsingular candidate geometries has been performed in a vast array of contexts [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. One could propose a list of further constraints on such geometries which would render them as appropriate as possible for the experimental community, and streamline the discourse between theory and experiment.…”