dear casper collaboration, you might have read about the discovery of the stochastic background of gravitational waves. "the cosmic hum of gravitational waves". i'm appending some media coverage from yesterday and today, from science and the washington post.
there's a live video public announcement from nanograv today at 13:00 eastern, 10:00am pacific time at this link: https://nanograv.org/news/15yrDataSet the discovery is a huge international collaboration of different pulsar timing groups. almost all (perhaps all) of the measurements from this discovery were done with casper based instruments, using hardware, software, tools, libraries that many of you developed. so congratulations ! best wishes and congrats on your amazing work, dan In major discovery, scientists say gravitational waves constantly churn space and time — seemingly affirming an Einstein theory <https://s2.washingtonpost.com/3a6f7b4/649cca1a9912225d7ca311b5/605b8901ae7e8a10b715c040/3/13/649cca1a9912225d7ca311b5> Multiple international teams of scientists have independently found compelling evidence for long-theorized space-time waves called the “gravitational wave background.” The announcement has sent a thrill through the astrophysics community, which has been buzzing for days in anticipation of papers that seem to affirm an astounding implication of Albert Einstein’s general theory of relativity. Read more <https://s2.washingtonpost.com/3a6f7b4/649cca1a9912225d7ca311b5/605b8901ae7e8a10b715c040/4/13/649cca1a9912225d7ca311b5> ASTROPHYSICS | NEWS FROM SCIENCE A cosmic hum of gravitational waves has finally been detected Scientists have long hypothesized that the fabric of spacetime is filled with ripples—long gravitational waves produced by colliding supermassive black holes. But these undulations are hard to detect, as there’s just so much background noise complicating their detection. Now, after 20 years of hunting, the hum of these overlapping gravitational waves has finally been heard, according to reports released last night involving five separate international teams. The feat was achieved by tuning into rapidly rotating pulsars. These now-dead stars emit radiation as they spin, blasting Earth at precise intervals. Because gravitational waves stretch and squish spacetime, they alter the timing of these pulsar flashes—and it’s these miniscule shifts in timing that the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) and four other pulsar timing arrays around the world have finally detected. “This is really epic,” says University of Amsterdam astrophysicist Jason Hessels, who used to work with one of the teams involved in the announcement. According to experts, it opens up all sorts of astronomical research and could even reveal new physics. “We’re not even close to the end of the story,” Hessels says. -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To view this discussion on the web visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAGHS_vFNzjsXAZ2mZFc-3wLYfW43bq%3D5rZQr6sa8Gt8r7hvUAQ%40mail.gmail.com.
