Cosmology period

  • What is cosmological period?

    Cosmic time, or cosmological time, is the time coordinate commonly used in the Big Bang models of physical cosmology..

  • It has been suggested that the cosmic history might repeat in cycles, with an infinite series of similar aeons in the past and the future.
    Here, we instead propose that the cosmic history repeats itself exactly, constructing a universe on a periodic temporal history, which we call Periodic Time Cosmology.
This period measures from 370,000 years until about 1 billion years. After recombination and decoupling, the universe was transparent but the clouds of hydrogen  Cosmic timeHydrogen lineReionizationEkpyrotic universe
This period measures from 370,000 years until about 1 billion years. After recombination and decoupling, the universe was transparent but the clouds of hydrogen  Hydrogen lineReionizationCosmic timeEkpyrotic universe

When did physical cosmology start?

In a modern sense, physical cosmology became established after the discovery of the cosmic microwave background in 1965 which quickly turned the hot big bang model into the standard model of the universe.
Jim Peebles’ Physical Cosmology of 1971, possibly the first book with this title, may be taken as the beginning of modern physical cosmology.


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