2023-06-30 03:00:16
The North American Nanohertz Observatory for Gravitational Waves (NANOGrav), an astronomy consortium conducting gravitational wave detection, announced that it would hold an important presentation event on June 30. It is said that background gravitational wave traces were captured from observational data spanning more than 15 years. Massive stars can become neutron stars with supernova explosions as a result of their mass being so massive. If there is a strong magnetism in such a neutron star, it becomes a celestial body called a pulsar that periodically emits strong electromagnetic waves along with its rotation. Electromagnetic waves emitted by pulsars can also be caught on Earth, and NANOGrav has been observing electromagnetic waves emitted by 68 pulsars over 15 years. Electromagnetic waves emitted from pulsars are periodically emitted at short intervals, but the NANOGrav research team announced that they found chaos that became the background gravitational wave trace in these cycles. For example, collisions between supermassive Blaggols create distortions in space itself. At this time, the entire gravitational field undulates and is a background gravitational wave. Until now, gravitational wave detection has been detecting gravitational waves emitted from large-mass black holes that orbit several to thousands of times per second, but this time, instead of directly detecting them from black holes, the point is that background gravitational wave traces can be observed from the pulsar period. In other words, the existing gravitational wave detection is like realizing a wave when it is shaken by a wave while riding on a boat, but this observation result can be said to be noticing the entire sea wave from the boat. Background gravitational waves also originate from massive black hole collisions, but they may also be traces of cosmic inflation, which suggests that the early universe was inflationary. In other words, being able to detect traces of background gravitational waves may be evidence supporting the cosmic inflation theory proposed in 1981, and in this sense it can be said to be a great discovery. NASA congratulates the NANOGrav discovery for detecting evidence that gravitational waves fill the universe. In the structure of the universe, background gravitational waves vortex each other before massive objects such as black holes collide. It gives us access to an understanding of how it evolves, he added. In this presentation, the data set analysis results and interpretation of the results collected over the past 15 years will also be reported. Related information can be found here.
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