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

  1. Jan 20, 2017 #1
    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. jcsd
  3. Jan 20, 2017 #2

    mfb

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    2016 Award

    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
     
  4. Jan 20, 2017 #3
    Hi @mfb:
    Thank you very much for spoting and letting me know about my careless error.

    Regards,
    Buzz
     
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