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nikkkom submitted a new PF Insights post
A Brief on the Expansion of the Universe
Continue reading the Original PF Insights Post.
A Brief on the Expansion of the Universe
Continue reading the Original PF Insights Post.
Chronos said:Any relationship between dark energy [Lambda] and inflation is an idea that is not widely shared among cosmologists. While there is a general consensus that matter froze out of the inflaton field, there is no firm evidence the inflaton field is related to Lambda. See https://medium.com/starts-with-a-ba...dark-energy-connected-6ef979bee115#.eqzjrm0qf and http://supernova.lbl.gov/~evlinder/defaq.html for further discussion.
nikkkom said:The text does not imply that we know that Lambda = inflaton field = dark energy.
PeterDonis said:Your statement that "##\Lambda## going down releases energy (in a form of appearance of new particles everywhere)" implies that the end of inflation involved "##\Lambda## going down", which implies that Lambda = inflaton field = dark energy.
nikkkom said:The text is "If “Λ (or dark energy) going down” releases energy...".
There is that "If" word. It is not a definitive statement.
Mordred said:For this we can detail using Newtons laws.
$$
F=\frac{GMm}{r^2}
$$
Mordred said:As we're dealing with test particles we just need the mass relation
$$
M = \frac{4 \pi \rho^3}{3}
$$
Mordred said:In that section I'm using the formulas in the sequence of the reference directly from Liddles textbook.
Mordred said:the cosmological constant isn't required to have expansion.
Mordred said:The original FLRW didn't include the Cosmological term, yet has numerous solutions for matter only universes expanding.
Mordred said:that depends on separation distance.
The expansion of the universe is the theory that the universe is constantly expanding, meaning that the distance between galaxies and other celestial objects is increasing over time.
In the early 20th century, astronomer Edwin Hubble observed that galaxies appeared to be moving away from us at a faster rate the further they were from our own galaxy. This led to the development of the Hubble-Lemaître Law, which states that the farther a galaxy is, the faster it is moving away from us.
Dark energy is a theoretical form of energy that is thought to make up about 70% of the universe. It is believed to be the driving force behind the expansion of the universe, as it counteracts the force of gravity and causes the expansion to accelerate.
Based on current observations, it is believed that the expansion of the universe will continue to accelerate, meaning that it will not slow down or stop. However, this is still an area of active research and further observations and studies may lead to new understandings of the expansion of the universe.
As the universe continues to expand, the distance between galaxies will increase and they will become more and more isolated from each other. This will eventually lead to the "heat death" of the universe, where all matter and energy will become evenly distributed and the universe will reach a state of maximum entropy.