Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

B Help me understand Boson stars

  1. Sep 4, 2017 #1

    wolram

    User Avatar
    Gold Member

    Boson stars seem to be a good fit for Dark Matter.
    https://arxiv.org/pdf/1704.05057v1.pdf
    Can you help me understand why such a huge particle with such low mass can exist, and how it could be found experimentally.
     
  2. jcsd
  3. Sep 4, 2017 #2

    PeterDonis

    User Avatar
    2016 Award

    Staff: Mentor

    Moderator's note: moving to the Beyond the Standard Model forum as the question is really about a hypothesized particle species not in the SM.
     
  4. Sep 5, 2017 #3

    Demystifier

    User Avatar
    Science Advisor

    Boson star is a solitonic solution of classical nonlinear field equations. As such, it consists of many elementary particles, or more precisely it is a quantum coherent state in which the number of particles is uncertain. The mass is low because there is an attractive force which makes a negative contribution to the total energy.
     
  5. Sep 5, 2017 #4

    wolram

    User Avatar
    Gold Member

    So it is a BEC, why is it it can not be seen against CBR?
     
  6. Sep 5, 2017 #5

    kimbyd

    User Avatar
    Gold Member

    The "boson stars" are basically just cold dark matter. Each "star" is a galactic halo, each of which is much larger than a visible galaxy. The concept here is that low-mass particles make up the dark matter, and they condense to form Bose-Einstein condensates in galaxy halos. Low-mass dark matter candidates are produced in ways that ensure they have very little kinetic energy, and the leading candidate is the axion.

    The way they would be detected would be by detecting the low-mass particles that make them up. This tends to be much more difficult than it is for WIMPs (which have much higher masses), but there have been some attempts (e.g. https://en.wikipedia.org/wiki/Axion_Dark_Matter_Experiment).

    Edit: And yes, these candidates are perfectly compatible with the CMB, as they are a potential theoretical explanation for cold dark matter which fits the CMB data quite well.
     
  7. Sep 6, 2017 #6

    wolram

    User Avatar
    Gold Member

    Thank you very much for the answers to my questions :biggrin:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Help me understand Boson stars
  1. Help me out here (Replies: 1)

  2. Can you help me (Replies: 3)

Loading...