Post Big Bang Gravity

In summary, "Post Big Bang Gravity" explores the role and evolution of gravity in the universe after the Big Bang. It discusses how gravity influences the formation of cosmic structures, such as galaxies and stars, and examines the interplay between gravity and other fundamental forces. The concept of gravity is framed within the context of cosmological models, highlighting its critical impact on the dynamics of the expanding universe and the eventual fate of cosmic entities. The work emphasizes ongoing scientific inquiries into the nature of gravity, its relationship with dark matter, and its implications for theories of quantum gravity.
  • #1
Hyku
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TL;DR Summary
How did gravity compress the mass of the post Big Bang universe?
If gravity is caused by the warping of spacetime - how did gravity compress the mass of the post Big Bang universe? Does said compression indicate the force of gravity exists independent of space time? Was Newtonian gravity responsible for the compression? On the other hand, if spacetime was the main causal factor of the formation of the universe - when did it come into existence?

Thanks.

Hyku (Curious layman)
 
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  • #2
Hyku said:
how did gravity compress the mass of the post Big Bang universe?
What makes you think this happened?
 
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  • #3
The "battle" between gravity and pressure.
 
  • #4
Hyku said:
The "battle" between gravity and pressure.
Our current models suggest that the universe started in a dense state. Gravity didn't have anything to do with making it that way.
Hyku said:
Was Newtonian gravity responsible for the compression?
Newtonian gravity isn't a separate effect; it's what you get from general relativity when the field strength is weak and everything is moving much slower than light.
Hyku said:
On the other hand, if spacetime was the main causal factor of the formation of the universe - when did it come into existence?
I don't understand what you are asking here.
 
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  • #5
It seems that my lay assumption "How did gravity compress the mass of the post Big Bang universe?" is incorrect. Thanks for your clarification. Regarding spacetime - what is it made of, and how does it support all the mass in the universe?

Thanks
 
  • #6
Spacetime is made up of spacetime.
 
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  • #7
Hyku said:
Regarding spacetime - what is it made of, and how does it support all the mass in the universe?
It's the lowest level thing there is in classical models of gravity. So it just is, it isn't made up of anything as far as we know. A working theory of quantum gravity may one day provide more answers, but we don't have one yet.
 
  • #8
Hyku said:
The "battle" between gravity and pressure.
There is no such thing in the universe as a whole. This "battle" you describe only exists in a system in hydrostatic equilibrium. The universe as a whole is not in hydrostatic equilibrium.
 
  • #9
Hyku said:
Regarding spacetime - what is it made of
It's not "made of" anything. In our current model of the universe, "spacetime" is a fundamental thing; it's not "made of" anything else.

Hyku said:
how does it support all the mass in the universe?
It doesn't; the universe as a whole is not in hydrostatic equilibrium, so there is no "support" to begin with.
 
  • #10
So, because the mass is in constant motion - it does not "fall"?
Does spacetime have the same velocity as said mass?
How does mass curve spacetime?
It seems that the "spacetime is like a sheet of rubber" analogy is fallacious?

Wow! The structure of the universe is counterintuitive. Yet, compared to the quantum world, it must be the equivalent of studying grade 10 algebra.

I am in humble shrub mode.:cool:
 
  • #11
Hyku said:
So, because the mass is in constant motion - it does not "fall"?
No. The matter in the universe as a whole does not "fall" because there is nowhere for it to "fall" to. There is no "center". The universe is homogeneous and isotropic.

Hyku said:
Does spacetime have the same velocity as said mass?
The question doesn't make sense. Spacetime has no "velocity".

Hyku said:
How does mass curve spacetime?
Through the Einstein Field Equation, as any basic textbook on GR will tell you.

Hyku said:
It seems that the "spacetime is like a sheet of rubber" analogy is fallacious?
It is certainly very limited, as plenty of previous PF threads will tell you. In particular, it does not work for the universe as a whole.
 
  • #12
Thanks guys.
 
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FAQ: Post Big Bang Gravity

What is Post Big Bang Gravity?

Post Big Bang Gravity refers to the behavior of gravitational forces and the dynamics of spacetime following the initial expansion of the universe during the Big Bang. It encompasses how gravity influences the formation of structures, such as galaxies and stars, as the universe evolves from its hot, dense state to its current form.

How does gravity behave immediately after the Big Bang?

Immediately after the Big Bang, gravity was not the dominant force due to the extreme temperatures and densities. Initially, the universe was governed by high-energy physics, and gravitational forces became significant as the universe cooled and matter began to clump together, leading to the formation of structures.

What role does dark energy play in the context of Post Big Bang Gravity?

Dark energy is thought to be responsible for the accelerated expansion of the universe observed today. After the initial gravitational clumping of matter, dark energy became more influential, counteracting the attractive force of gravity on cosmic scales and leading to the current understanding of an expanding universe.

How do scientists study Post Big Bang Gravity?

Scientists study Post Big Bang Gravity through a combination of observational astronomy, theoretical physics, and cosmological simulations. Observations of cosmic microwave background radiation, galaxy distributions, and gravitational waves provide insights into the behavior of gravity over cosmic time, while theoretical models help explain the underlying mechanisms.

What are the implications of Post Big Bang Gravity for the fate of the universe?

The implications of Post Big Bang Gravity include various scenarios for the ultimate fate of the universe, such as continued expansion, a potential "Big Crunch," or a steady state. Current evidence supports the idea of an ever-expanding universe dominated by dark energy, leading to a scenario known as the "Big Freeze," where galaxies drift apart and the universe becomes increasingly cold and empty.

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