Dark matter mass

  • I
  • Thread starter Ranku
  • Start date
243
2

Main Question or Discussion Point

Is there any indication, such as through gravitational lensing, that dark matter has a low-mass compared to visible matter?
 

Answers and Replies

Orodruin
Staff Emeritus
Science Advisor
Homework Helper
Insights Author
Gold Member
2018 Award
16,176
6,107
Are you referring to the dark matter particle mass or the total mass of dark matter?

In the first case no, you have viable dark matter candidates in a very large span of masses. In the second, the total mass of dark matter in the Universe is about five times that of normal matter.
 
243
2
Are you referring to the dark matter particle mass or the total mass of dark matter?
I meant in the first case. Does gravitational lensing indicate anything, one way or another?
 
Orodruin
Staff Emeritus
Science Advisor
Homework Helper
Insights Author
Gold Member
2018 Award
16,176
6,107
I meant in the first case. Does gravitational lensing indicate anything, one way or another?
Micro-lensing rules out some range of masses for quite massive objects such as primordial black holes. When it comes to fundamental particle candidates, it does not.
 
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
23,478
5,924
Is there any indication, such as through gravitational lensing, that dark matter has a low-mass compared to visible matter?
I think you need to clarify this question. How much are we talking about? A kilogram of each weighs the same, no?
 
243
2
I think you need to clarify this question. How much are we talking about? A kilogram of each weighs the same, no?
I mean in terms of comparable volumes of visible and dark matter - although not sure how practically feasible it is to compare between volumes.
 
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
23,478
5,924
In the galaxy as a whole, there is more dark matter. In the earth, there is more baryonic matter.
 
1,392
139
If there were dense lumps of dark matter then microlensing of light by such dense lumps of dark matter would show up as low angle scattering.
Absence of such low angle scattering suggests lack of lumps of certain sizes, and that dark matter is divided into big but low and smooth density lumps.
 

Related Threads for: Dark matter mass

  • Last Post
Replies
15
Views
2K
Replies
37
Views
2K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
3
Views
2K
Replies
16
Views
5K
Replies
7
Views
2K
Replies
5
Views
13K
  • Last Post
Replies
5
Views
2K
Top