The Naked Scientists

The Naked Scientists Forum

Author Topic: Does the expanding universe prove that dark matter existed before the big bang?  (Read 259 times)

Offline thedoc

  • Forum Admin
  • Administrator
  • Sr. Member
  • *****
  • Posts: 511
  • Thanked: 12 times
    • View Profile
David asked the Naked Scientists:
   If the Universe (space and matter) is expanding and accellerating faster the greater distance you are from the known limits of the Universe. My question(s) is:-

Does the expanding Universe prove that dark matter existed before the big bang?........and.........

If the Universe is expanding, what has created the space in the first place to allow space and time to expand within it (chicken and egg scenario lol)?
What do you think?
« Last Edit: 28/09/2016 13:23:01 by _system »


 

Offline Bill S

  • Neilep Level Member
  • ******
  • Posts: 1828
  • Thanked: 12 times
    • View Profile
Hi David; I'm certainly not an expert, so question everything I say. :)

Quote
If the Universe (space and matter) is expanding and accellerating faster the greater distance you are from the known limits of the Universe.

My understanding is that there are limits to our knowledge of the Universe, but we don't what, if any, limits the Universe might have.

Quote
Does the expanding Universe prove that dark matter existed before the big bang?

I don't see why it would prove that, but possibly you have thought of something I have not.

Quote
If the Universe is expanding, what has created the space in the first place to allow space and time to expand within it

Informed opinion seems to be that there was probably no pre-existing space and time.  Time and space were created with, and expand with, the Universe.

 

Offline evan_au

  • Neilep Level Member
  • ******
  • Posts: 4126
  • Thanked: 247 times
    • View Profile
Quote from: David
Does the expanding Universe prove that dark matter existed before the big bang?
We don't really know what dark matter is, or what its properties are - but we see the effects of its gravity.

The effect of this gravity is to slow down the expansion of the universe.

Observations show that the universe is expanding, and is expanding at an accelerating rate. This is the opposite of the effect you expect from dark matter.

So dark energy (another unknown) has been suggested as the driver for the accelerating expansion of the universe.

Perhaps this implies that (pent-up) dark energy existed before the big bang, but I don't see how it suggests the existence of dark matter before the big bang.
 

The Naked Scientists Forum


 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums