Yet spotting a long cosmic string could be incredibly difficult: Computer simulations suggest they would be spaced about 325 million light-years apart. With such density, cosmic strings would act as gravitational lenses if they floated in front of bright background objects, and this could be one way to find one. Strings also may be incredibly dense, much denser than the matter at a neutron star’s center. If they exist, cosmic strings are almost unimaginably thin, yet they possess nearly unlimited length. These sinewy filaments of matter might forever be frozen in a primordial state, having avoided the cosmic inflation the rest of the universe experienced. These features might have formed like fissures in ice, along faults between transition zones. The current thinking on cosmic strings goes as follows: When inflation occurred, “cracks” in the universe’s phase transition arose, and these cracks created thin, superdense strings of matter and energy. According to Alexander Vilenkin of Tufts University, however, who pioneered cosmic string theory by suggesting strings could have triggered the formation of galaxies, the discoveries have “breathed new life into this field.” Two research teams have reported evidence of cosmic strings in different parts of the sky, but these observations are unconfirmed. With the reformulation of what astronomers think strings might be, the question of whether they can be detected still hangs out there. Because of these changes, they would have less effect on the cosmos than astronomers originally thought, so they would not necessarily be ruled in or out of existence by recent observations The strings researchers currently propose are less massive and more stable than the ones originally thought up in the 1980s. The current incarnation of the theory suggests cosmic strings arose after the inflationary period. He now believes these tiny stringlike loops of energy could be the universe’s basic form of matter and energy and that some strings could reach enormous sizes. Edward Witten of Princeton University, one of the world’s foremost theoretical physicists, says, “Strings of different sizes and kinds probably exist.” Thirty years ago, Witten opposed string theory. Some cosmologists are embracing the possibilities. We’re excited to announce Astronomy magazine’s new Space and Beyond subscription box - a quarterly adventure, curated with an astronomy-themed collection in every box. The answer could be cosmic strings.īringing the universe to your door. One of the universe’s strangest conundrums is the smoothness of the early cosmos following the Big Bang and how clumpy things like galaxies could have formed suddenly from it. Do long, thin, and incredibly dense strands of matter called cosmic strings wind their way throughout the universe? This theoretical idea took off with a bang in the 1980s, received a torrent of skepticism in the 1990s, underwent a resurgence of credibility in the 2000s, and has since remained a tantalizing, yet unproven, model. One of the strangest ideas about the nature of the universe could be one of the most important.
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