nivek
As Above So Below
Strange Shadows in Space May Be Wormholes
In a paper submitted to the Physical Review D journal arXiv but not yet peer-reviewed, Tata Institute of Fundamental Research physicist Rajibul Shaikh first looks at black holes, which we can’t see directly yet, and their shadows, which are actually dark spots made by matter that’s being pulled into the black hole passing over the bright event horizon – the light that hasn’t yet been sucked into the black hole’s darkness.
Shaikh proposes that wormholes cast a similar yet distinguishable shadow.
While prior models have calculated the shadow of a wormhole before, Shaikh adds data from the throat or connecting center tunnel of a particle type of fast-rotating wormhole. According to his calculations, the shadow of this type of wormhole would be distorted in comparison to that of a black hole, which would be a well-formed disc.
Shadows of rotating wormholes
Abstract
We study shadows cast by a certain class of rotating wormholes and point out the crucial role of a rotating wormhole throat in the formation of a shadow, a crucial point overlooking of which has resulted erroneous results in the earlier studies on shadows of the same class of rotating wormholes.
We explore the dependence of the shadows on the spin of the wormholes. We compare our results with that of the Kerr black hole. With increasing values of the spin, the shapes of the wormhole shadows start deviating considerably from that of the black hole. Such considerable deviation, if detected in future observations, may possibly indicate the presence of a wormhole.
In other words, the results obtained here indicate that, through the observations of their shadows, the wormholes which are considered in this work and have reasonable spin, can be distinguished from a black hole.
.
In a paper submitted to the Physical Review D journal arXiv but not yet peer-reviewed, Tata Institute of Fundamental Research physicist Rajibul Shaikh first looks at black holes, which we can’t see directly yet, and their shadows, which are actually dark spots made by matter that’s being pulled into the black hole passing over the bright event horizon – the light that hasn’t yet been sucked into the black hole’s darkness.
Shaikh proposes that wormholes cast a similar yet distinguishable shadow.
In the observer’s sky, the scattered photons form bright spots, whereas the photons captured by the wormhole form dark spots. The union of the dark spots in the observer’s sky constitute the shadow.
While prior models have calculated the shadow of a wormhole before, Shaikh adds data from the throat or connecting center tunnel of a particle type of fast-rotating wormhole. According to his calculations, the shadow of this type of wormhole would be distorted in comparison to that of a black hole, which would be a well-formed disc.
Shadows of rotating wormholes
Abstract
We study shadows cast by a certain class of rotating wormholes and point out the crucial role of a rotating wormhole throat in the formation of a shadow, a crucial point overlooking of which has resulted erroneous results in the earlier studies on shadows of the same class of rotating wormholes.
We explore the dependence of the shadows on the spin of the wormholes. We compare our results with that of the Kerr black hole. With increasing values of the spin, the shapes of the wormhole shadows start deviating considerably from that of the black hole. Such considerable deviation, if detected in future observations, may possibly indicate the presence of a wormhole.
In other words, the results obtained here indicate that, through the observations of their shadows, the wormholes which are considered in this work and have reasonable spin, can be distinguished from a black hole.
.