My Math Forum Dark matter "equals" dark energy

 Physics Physics Forum

 January 9th, 2018, 09:14 PM #1 Senior Member   Joined: May 2015 From: Arlington, VA Posts: 397 Thanks: 27 Math Focus: Number theory Dark matter "equals" dark energy Dark matter causes an inward acceleration. Dark energy causes an outward acceleration. Where do they offset each other?
 January 10th, 2018, 01:45 PM #2 Global Moderator   Joined: May 2007 Posts: 6,730 Thanks: 689 Dark matter and dark energy are completely different things. Dark matter is "stuff" that manifests itelf by gravitational effects, just like ordinary matter. Dark energy appears to be a property of space itself and is much harder to describe physically, since it appears as a term in general relativity description.
January 10th, 2018, 04:32 PM   #3
Senior Member

Joined: Sep 2015
From: USA

Posts: 2,404
Thanks: 1306

Quote:
 Originally Posted by mathman Dark matter is "stuff" that manifests itelf by gravitational effects, just like ordinary matter.
Jury is still out on this. There's a credible new theory of gravity where dark matter is just an artifact of the force law at very large distances.

https://en.wikipedia.org/wiki/Entropic_gravity

January 11th, 2018, 01:09 AM   #4
Senior Member

Joined: Apr 2014
From: Glasgow

Posts: 2,150
Thanks: 730

Math Focus: Physics, mathematical modelling, numerical and computational solutions
Quote:
 Originally Posted by Loren Dark matter causes an inward acceleration. Dark energy causes an outward acceleration. Where do they offset each other?
Little is known about the distribution of dark energy, but dark matter is certainly not homogeneous in the Universe, except at very large scales. Therefore, it's is not a simple balance problem.

Dark matter is unobserved matter that was hypothesised because the rotation profiles of galaxies seem to suggest that some sort of unobserved matter around galaxy haloes. No one knows what dark matter really is, but some people think that rotation profiles can be solved by considering alternative theories of gravity, like MOdified Newtonian Gravity (MOND).

Energy is something that is exchanged in most physical processes. Dark energy is energy that is unaccounted for by known phenomena and was hypothesised because SN 1a observations seem to suggest that the expansion of the Universe is accelerating, which is not accounted for in the vanilla Big Bang model. No one knows what dark energy really is.

Last edited by Benit13; January 11th, 2018 at 01:15 AM.

 Tags dark, energy, equals, matter

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post Loren Physics 3 July 13th, 2017 01:41 AM Loren Physics 15 November 4th, 2016 09:33 PM Loren Physics 1 September 5th, 2016 10:36 PM Carl James Mesaros Physics 9 April 1st, 2016 01:54 AM strangestofquarks Physics 24 January 19th, 2016 12:54 AM

 Contact - Home - Forums - Cryptocurrency Forum - Top