Shulou(Shulou.com)11/24 Report--

Thanks to CTOnews.com netizens for the delivery of clues about the past, rain and snow! CTOnews.com, June 29, China Sky Eye FAST is the largest and most sensitive radio astronomical telescope in the world, and many important achievements have been found since its operation.

According to a CCTV news report, recently, a Chinese pulse star timing array research team, composed of researchers from the National Astronomical Observatory of the Chinese Academy of Sciences, detected key evidence of the existence of Nahertz gravitational waves using Chinese Sky Eye FAST, indicating that China's research on Nahertz gravitational waves has reached a leading level in step with the international level.

The official Weibo of the Chinese Academy of Sciences has also released an introduction video. Recently, a team of researchers from the National Astronomical Observatory of the Chinese Academy of Sciences (CPTA) analyzed the three-year and five-month data collected by FAST and found key evidence of the existence of the Nahertz gravitational wave at the 4.6 Sigma confidence level (false positive rate less than 1/500000).

CTOnews.com note: the Nahertz gravitational wave is a kind of gravitational wave, which is an extremely low frequency disturbance in the universe. Its frequency is 10 to the negative ninth power Hertz. The detection of Nahertz gravitational wave is very challenging because its frequency is very low, its period is several years, and its wavelength can reach several light years.

The relevant research results were published online in the Chinese Astronomical academic Journal Astronomy and Astrophysics on June 29, Beijing time.

In general relativity, gravitational waves are ripples of space-time. When a stone is thrown into a pond, it creates ripples on the surface of the pond and spreads outward from where the stone enters the water. When an object with mass moves in acceleration, it will also produce ripples in space-time, propagating outward from the position of the object with mass, and the ripples in space-time are gravitational waves.

Because the interaction between gravitational waves and matter is very weak, gravitational waves are not easily changed by matter on the way, so gravitational waves are excellent information carriers that enable human beings to observe valuable information from the depths of the universe. Gravitational wave astronomy is a new branch of observational astronomy. Gravitational wave astronomy uses gravitational waves to collect gravitational wave sources for severe astronomical events, such as white dwarfs, neutron stars and black holes. Supernovae and the Big Bang are also the sources of gravitational waves for severe astronomical events.

In 1916, Albert Einstein predicted the existence of gravitational waves based on general relativity. In 1974, Russell Hulse and Joseph Taylor discovered the Hulse-Taylor pulse binary. When the two star systems revolve around each other, they lose energy due to the continuous emission of gravitational waves, so they gradually get closer to each other, which provides the first indirect evidence for the existence of gravitational waves.

On February 11, 2016, the LIGO Science team and the Virgo Interferometer team announced that gravitational waves were first directly observed by humans on September 14, 2015, resulting from the merger of two black holes. Since then, gravitational wave events have been observed for many times, such as the gravitational wave event GW170817, which originated from the merging of two neutron stars, was first detected on August 17, 2017. In 2017, Leonard Weiss, Barry Barish and Kip Thorne won the Nobel Prize in physics for their success in observing gravitational waves.

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