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krrazypassion
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Expansion of the universe: Aren't there 2 distinct expansions we are talking about?
Expansion No.1: This is caused due to Big Bang. Singularity expanded with huge acceleration. Also called inflation. With time, this expansion decelerated. It is observed in the cosmological redshifts. The deeper we look in space, the deeper into past we are looking. So, as we look deeper, we witness a younger universe. A universe as was sooner after big bang. Here, we see matter with large cosmological redshifts,up to 1089 in case of the Cosmic Microwave Background, which happened around 378000 years after Big Bang. The cosmological redshifts in case of very distant galaxies(currently received light from these has traveled 13.1 billion years) are 8, and this happened 652 million years after Big Bang. Closer galaxies(currently received light from these has traveled 11.5 billion years) show cosmological redshift of 3.
Expansion No.2: This is the reason why we are talking about increasingly expanding universe. And that leads to dark energy.
However, we are often given explanations of presently expanding universe due to Expansion No. 2 with the irrelevant examples of cosmological redshifts which are observed to be increasing as we look deeper, while these examples actually indicate only the fact that there was a big bang and inflation, and this expansion no.1 decelerated with time. Right?(read the first paragraph again if you didn't grasp the point I'm trying to make about expansion no.1 and cosmological redshifts)
Also, what are the relevant examples and evidences for expansion no.2 then?
Expansion No.1: This is caused due to Big Bang. Singularity expanded with huge acceleration. Also called inflation. With time, this expansion decelerated. It is observed in the cosmological redshifts. The deeper we look in space, the deeper into past we are looking. So, as we look deeper, we witness a younger universe. A universe as was sooner after big bang. Here, we see matter with large cosmological redshifts,up to 1089 in case of the Cosmic Microwave Background, which happened around 378000 years after Big Bang. The cosmological redshifts in case of very distant galaxies(currently received light from these has traveled 13.1 billion years) are 8, and this happened 652 million years after Big Bang. Closer galaxies(currently received light from these has traveled 11.5 billion years) show cosmological redshift of 3.
Expansion No.2: This is the reason why we are talking about increasingly expanding universe. And that leads to dark energy.
However, we are often given explanations of presently expanding universe due to Expansion No. 2 with the irrelevant examples of cosmological redshifts which are observed to be increasing as we look deeper, while these examples actually indicate only the fact that there was a big bang and inflation, and this expansion no.1 decelerated with time. Right?(read the first paragraph again if you didn't grasp the point I'm trying to make about expansion no.1 and cosmological redshifts)
Also, what are the relevant examples and evidences for expansion no.2 then?