What is an Einstein Rosen Bridge
How to find a wormhole in the cosmos
Wormholes already have a fixed place in science fiction. To bridge the light-years-wide distances between the stars, happen
Spaceships are tunnels through space-time, so to speak, to shorten their journeys accordingly. As futuristic as such passages may appear, at least according to the currently valid mathematical theories, they could actually exist. An international team of astrophysicists has now proposed a way of finding such a wormhole in the cosmos.
Einstein-Rosen bridges between distant places in the cosmos
Albert Einstein and Nathan Rosen derived the cosmological basis for wormholes in space in 1935 from the field equations of general relativity theory (ART). These so-called Kruskal solutions of the ART, also known as Einstein-Rosen bridges, assume that black holes are connected to equivalent white holes by a transition. The hypothesis states that such wormholes could connect two places of the same spacetime but also two different spacetime of a multiverse.
If such wormholes really exist in space, then they would probably most likely be discovered in the vicinity of supermassive black holes, says a research group led by De-Chang Dai from Yangzhou University in China and Dejan Stojkovic from the University at Buffalo, USA. In the journal "Physical Review D", the astrophysicists have for the first time presented a method how such a theoretical wormhole could be discovered in the immediate vicinity of the supermassive black hole Sagittarius A * in the center of the Milky Way, since such wormhole phenomena would require extreme gravitational conditions.
The idea behind it: Stars near the wormhole exit would be influenced by the gravity of those stars that are at the other end of the wormhole, provided that there are stars there. According to scientists, such a gravitational influence from a distance would manifest itself in changes in the orbits of the stars on this side around Sagittarius A *. Something like this can actually also be observed from Earth, the scientists assure - even if not yet.
"If there is a star at both ends of the wormhole, these objects could feel the gravitational influence of the other on the opposite side of the wormhole, as gravity would continue through the wormhole," says Stojkovic. "If you analyze the orbits of the stars around Sagittarius A * and detect deviations in their previously calculated orbits compared to the observations, this could indicate the entrance of a wormhole there."
"Magical" tunnel through the cosmos
According to the researchers, however, these considerations are still largely theoretical, at least for the time being. Current technologies are not yet precise enough to demonstrate the orbital differences that two stars connected by a wormhole exert on one another. The next generation of telescopes would be able to do this, the scientists are convinced.
Should such a wormhole actually be found, it would probably still have little in common with the visions of the science fiction authors. "Even if the passage of a wormhole were possible, you would need a source of negative energy to keep the end of the wormhole open. We don't know how to do that, at least at the moment," says Stojkovic. "To keep a really big, stable wormhole open, you really need something like magic." (tberg, November 3rd, 2019)
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