How Does Hubble's Constant Relate to Universe Inflation and Horizon Changes?

  • Thread starter Thread starter hobobobo
  • Start date Start date
AI Thread Summary
Hubble's constant, approximately 70 km/s/Mpc, describes the rate of expansion of the universe, indicating how fast galaxies are moving away from each other. This expansion is linked to cosmic inflation, which suggests that the universe underwent rapid expansion shortly after the Big Bang, affecting the observable horizon. The Hubble horizon represents the maximum distance from which light has had time to reach an observer since the beginning of the universe, influenced by the rate of expansion. Understanding these concepts helps clarify how the universe's expansion impacts what we can observe. The relationship between Hubble's constant and cosmic inflation is crucial for grasping the dynamics of the universe's growth and its observable limits.
hobobobo
Messages
40
Reaction score
0
Ok I'm kinda confused of what is the relationship between hubble's constant, hubble's horizon length and how all those calculation works. I'm reading a textbook called quarks, leptons and the big bang but they don't explain it clearly, maybe I'm just slow but could anyone explain to me thnx!
 
Space news on Phys.org
hobobobo said:
Ok I'm kinda confused of what is the relationship between hubble's constant, hubble's horizon length and how all those calculation works. I'm reading a textbook called quarks, leptons and the big bang but they don't explain it clearly, maybe I'm just slow but could anyone explain to me thnx!

Hubble constant is 70 km/s / Mpc.

Take the speed of light divided by 70 km/s and multiply by 1 Mpc.
 
hmmm ok maybe I wasn't clear of what I was trying to ask. I want to know how it relates to the inflation of the universe and the how the horizon is being affected during this major expansion. I don't want any calculation I just want to know the concept, but thanks for the Hubble constant calculation!
 

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
View full post »

Thread 'Hubble Constant, Dark Energy and the Expanding Universe'

Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
View full post »

Similar threads

I Why is inflation initial patch length ~ 1 Hubble length ?
Replies
2
Views
2K
I Slow-roll Inflation and Horizon Problem
Replies
1
Views
1K
I Difference between hubble sphere,particle horizon and event
Replies
11
Views
9K
Inflation, comoving Hubble radius and particle horizon
Replies
1
Views
4K
B Does dark energy or cosmic inflation explain flatness?
Replies
37
Views
5K
I Some questions about Cosmic Inflation
Replies
4
Views
4K
I How is the sound horizon at recombination and BAO measured in the CMB?
Replies
1
Views
2K
I Troubles understanding slow-roll conditions in Inflation
Replies
9
Views
2K
I The particle horizon value is ignoring inflation?
Replies
4
Views
2K
I Universe is a sphere that is centered on any observer? How?
Replies
17
Views
3K

Hot Threads

Recent Insights

Back
Top