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Did the rapid cooling of the universe crack the entire fabric of spacetime? Everything says it should have, but why can't we find these elusive "cosmic strings"?
Galaxy-Size Gravitational-Wave Detector Hints at Exotic Physics Recent results from a pulsar timing array, which uses dead stars to hunt for gravitational waves, has scientists speculating about cosmic strings and primordial black holes Print Representative illustration of Earth embedded in spacetime that is deformed by the background gravitational waves and its effects on radio signals coming from observed pulsars. Credit: Tonia Klein Advertisement The fabric of spacetime may be frothing with gigantic gravitational waves, and the possibility has sent physicists into a tizzy. A potential signal seen in the light from dead stellar cores known as pulsars has driven a flurry of theoretical papers speculating about exotic explanations.
Cosmic Ringtones in Pulsar Data? January 28, 2021• Physics 14, 15 A pulsar survey has detected a potential signal from low-frequency gravitational waves, which theorists are eager to explain. Tonia Klein/NANOGrav By monitoring the radio flashes from distant pulsars, astronomers have spotted a signal that could be the result of a background of gravitational waves. Tonia Klein/NANOGrav By monitoring the radio flashes from distant pulsars, astronomers have spotted a signal that could be the result of a background of gravitational waves.× Imagine a gravitational-wave detector stretching over a sizeable chunk of our Galaxy. That, in a nutshell, is the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), which monitors distances in our cosmic neighborhood using a network of clock-like stars, called pulsars. In late 2020, the NANOGrav team reported seeing fluctuations in the timing of pulsar ticks, which could be evidence of gravitational waves at nanohertz frequencies [1]. The source of such slow-cycling waves could be black hole mergers, but several new theoretical studies—all appearing in