Accelerating Universe Expansion: Age & Hubble Constant

In summary, the article discusses how the age of the universe is affected by the rate of acceleration, which is determined by the value of the Hubble Constant at the present time. The article also explores how the expansion of the universe may progress in the future under different scenarios. However, the article's assumptions are not in line with the Lambda-CDM model and the estimate for the age of the universe is based on the cosmological model. The conversation ends due to the unacceptable reference used in the thread.
  • #1
Mike holden
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TL;DR Summary
How the age of the Universe depends on the rate of acceleration.
In my article - The accelerating expansion of the Universe at:
[Unacceptable reference delted by the Mentors]
I discuss how the age of the Universe depends on the rate of acceleration, the common factor being the value of the Hubble Constant at the present time. I go on to show how the expansion progresses in the future for each scenario.
 
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  • #2
Mike holden said:
age of the Universe depends on the rate of acceleration
The age of the universe is what it is. It doesn't get older because the rate changes, although the rate may change as it gets older.
 
  • #3
The article makes fundamental assumptions that are not in accordance with the Lambda-CDM model. Assuming a simple power law is fine if you only have a single type of energy component in the Universe, but then the exponent will depend on the equation of state parameter of that component. In the current Universe, matter and the cosmological constant are of similar energy density and this means the simple power law is not a good description.

In addition, the estimate for the age of the Universe is based upon the cosmological model.
 
  • #4
Since the thread start was based on an unacceptable reference, the thread is closed.
 

1. What is the accelerating expansion of the universe?

The accelerating expansion of the universe refers to the observation that the rate at which the universe is expanding is increasing over time. This means that the distances between galaxies are getting larger at a faster and faster rate.

2. How do we know that the universe is expanding?

We know that the universe is expanding because of the observation of redshift in light from distant galaxies. This redshift is caused by the stretching of light waves as they travel through the expanding universe, similar to how the pitch of a siren changes as it moves away from you. Additionally, the cosmic microwave background radiation, leftover from the Big Bang, also provides evidence for the expansion of the universe.

3. How does the age of the universe relate to its expansion?

The age of the universe is closely related to its expansion. The current estimated age of the universe is about 13.8 billion years, and this age is determined by measuring the rate of expansion and working backwards to determine when the universe would have started expanding from a single point (the Big Bang).

4. What is the Hubble constant and how does it relate to the expansion of the universe?

The Hubble constant is a measure of the rate at which the universe is expanding. It is named after astronomer Edwin Hubble, who first discovered the expansion of the universe. The value of the Hubble constant is important in determining the age and size of the universe, as well as the amount of dark energy (the force driving the acceleration) present in the universe.

5. What is causing the acceleration of the universe's expansion?

The cause of the acceleration of the universe's expansion is still a topic of ongoing research and debate. One theory is that there is a mysterious force known as dark energy, which makes up about 70% of the total energy in the universe, and is responsible for the acceleration. Another theory is that our understanding of gravity on a large scale is incomplete and needs to be modified to explain the observed acceleration.

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