I Why is the DM density near the sun so small?

1. Jan 20, 2017

Buzz Bloom

This question arose in the context of another thread.
Wikipedia gives an estimated value for the DM density near the sun of
0.35 × GeV/cm3 = 6.2 ×10−25 g/cm3.​
The value of the average DM density in the universe
ρDM = 2.26 ×10−24 g/cm3.
https://en.wikipedia.org/wiki/Milky_Way - Bottom of list of Observation data​
This means that ρDM is approximately 3.6 times the density of DM near the sun.

I unsuccessfully have tried to find references that provide an answer to the question, but my skills are not up to the challenge. I am hopeful that one or more knowledgeable participants here the PFs can help me.

Regards,
Buzz

Last edited: Jan 20, 2017
2. Jan 20, 2017

Staff: Mentor

The average density in the universe is 2.26*10-30 g/cm3, 4.5 orders of magnitude thinner than the local density. I guess you mixed cm3 and m3, as the number is equal to 2.26*10-24 g/m3.

source values

3. Jan 20, 2017

Buzz Bloom

Hi @mfb:
Thank you very much for spoting and letting me know about my careless error.

Regards,
Buzz