There is a very common misconception here. The Big Bang was not an explosion in the common meaning of the word. Throughout the history of the Universe, matter and radiation have both been relatively evenly spread in it. This is not and have never been a problem for the Big Bang model.orricl said:According to the hot Big Bang model, about 380000 years after that violent explosion,
Before decoupling, the matter was almost perfectly evenly-distributed. We can see the photons that resulted from that decoupling, and the temperature variance is approximately one part in 100,000. This roughly correlates to a density variance.orricl said:According to the hot Big Bang model, about 380000 years after that violent explosion, the universe was transparent to radiation but before that moment photons were trapped in the soup of ionized plasma. And my question is how does the matter distribute in space before the photons decouple from the ionized plasma?
Inflation does have the property that quantum fluctuations during inflation become small density variations in the early universe, variations that eventually grow to become galaxies, galaxy clusters, etc.ChrisVer said:I want to clarify something:
Is "inflation" the reason of the density perturbations?
Huh ?rootone said:It's good to know that the evidence incriminates the suspect we thought it was.
That does not prove much though, other than humans seek patterns.
They are, but from a very particular random distribution (Gaussian, scale-invariant).ChrisVer said:Couldn't e.g. those perturbations happen due to chaotic/statistical events?
CMB stands for Cosmic Microwave Background. It is a type of radiation that permeates the entire universe and is a remnant of the Big Bang. It is the oldest light in the universe, dating back to about 380,000 years after the Big Bang.
Before photon decoupling, matter in the universe was evenly distributed in a hot, dense plasma. This plasma was made up of particles such as protons, neutrons, and electrons. As the universe expanded and cooled, these particles began to combine and form atoms, and the photons were able to travel freely without interacting with the matter.
Photon decoupling is a critical event in the history of the universe. It marks the point at which the universe becomes transparent, allowing light to travel freely. This is significant because it allows us to observe the CMB, which provides valuable information about the early universe.
The CMB radiation is almost completely uniform, but there are tiny variations in temperature that are believed to be the seeds of the large-scale structures we see in the universe today. By studying these variations, scientists can gain insight into the distribution of matter and the evolution of the universe.
Scientists use a variety of tools and techniques to study the CMB, including telescopes, satellites, and ground-based experiments. These instruments measure the temperature and polarization of the CMB radiation to gather data about its properties and help us understand the structure and history of the universe.