Traversable Wormholes Can Exist, But They're Not Very Useful For Space Travel, Physicists Say

A new study from physicists at Harvard and Stanford says that
wormholes can exist but they’re not very useful for humans to
travel through. “It takes longer to get through these wormholes
than to go directly, so they are not very useful for space travel,”
said the author of the study, Daniel Jafferis. From the report:
Despite his pessimism for pan-galactic travel, he said that finding
a way to construct a wormhole through which light could travel was
a boost in the quest to develop a theory of quantum gravity. The
new theory was inspired when Jafferis began thinking about two
black holes that were entangled on a quantum level, as formulated
in the ER=EPR correspondence by Juan Maldacena from the Institute
for Advanced Study and Lenny Susskind from Stanford. Although this
means the direct connection between the black holes is shorter than
the wormhole connection — and therefore the wormhole travel is not
a shortcut — the theory gives new insights into quantum mechanics.
“From the outside perspective, travel through the wormhole is
equivalent to quantum teleportation using entangled black holes,”
Jafferis said. Jafferis based his theory on a setup first devised
by Einstein and Rosen in 1935, consisting of a connection between
two black holes (the term wormhole was coined in 1957). Because the
wormhole is traversable, Jafferis said, it was a special case in
which information could be extracted from a black hole. “It gives a
causal probe of regions that would otherwise have been behind a
horizon, a window to the experience of an observer inside a
spacetime, that is accessible from the outside,” said Jafferis. The
physicists presented their results at the 2019 American Physical
Society April Meeting in Denver, Colorado.


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Source: *FS – All – Science News 2 Net
Traversable Wormholes Can Exist, But They're Not Very Useful For Space Travel, Physicists Say