Astronomy and space science How the Universe Began : Nanohertz Gravitational Waves and the Physics of the Birth of the Universe

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Astronomy and Space Science : Is the mysterious "nanohertz gravity wave" a trace of the birth of the universe? The report of the observation project "Nanograph" that shocked the world in 2023. It said that it captured the existence of a gravitational wave. The discovered gravitational wave is the "nanohertz gravity wave" which is a gravitational wave with a period of "nano = 10 to the minus 9th power". * The actually observed gravitational wave is the period of 10 to the minus 15th power and the wavelength is the size of the Milky Way. The method used in this observation project is the "pulsar timing method". The method used in this observation project is the "pulsar timing method". The "pulsar timing method" is a method to detect the distortion of the space of the universe by observing the radio wave sent from the "pulsar", which is also called a radio star. Then, where was this nanohertz (ultra-long wavelength) gravitational wave born? - The trace of the time when the space was stretched by the "inflation", which is said to have occurred before the Big Bang, the origin of the universe "Primitive Background Gravitational Wave". - The "supergiant black hole", which is said to be hundreds of millions of times the mass of the Sun, which exists in the "active galactic nucleus", the center of the galaxy, merged. Until now, it has been considered a mystery "The Beginning of the Universe". Seeing the trace has begun to become a reality for mankind. In this book, we explain the cosmology in the background one step at a time. What is gravity? What is the Einstein equation? And how is the origin of the universe considered? It has become a reality for mankind. This book explains the "pulsar timing method" and future observation plans for precise observation of the space using the "pulsar" conducted by the "nanograph" and using the "pulsar timing array" for more than 15 years. It introduces the reality of this mysterious extra-long wavelength gravitational wave "nanohertz gravity wave". It introduces modern astronomy and the latest cosmology that is close to the beginning of the universe!