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Describe Dark Energy Like Force

  1. May 11, 2015 #1
    1/2 mv2 kinetic energy of expansion and force will beΩ
    m(dv/dt)=m((dH/dt)D+H2D). Thats the force of expansion. But have can we describe the force of dark energy ? I thought F=P/S P=ωρc2 then force will be F=-ρc2/R2 am I right ? (ρ=dark energy density)
     
  2. jcsd
  3. May 11, 2015 #2

    PeterDonis

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    No, it isn't. Expansion is not a force; objects which are moving with the Hubble flow are moving along geodesics, with no applied force at all.

    Dark energy isn't a force either; it's just a contribution to the overall spacetime geometry that determines the Hubble flow.
     
  4. May 11, 2015 #3
    Cant we show them like force I know theres no force theorytically
     
  5. May 11, 2015 #4

    PeterDonis

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    No. "Force" would imply either non-geodesic motion, or a non-inertial frame in which a comoving object's coordinate acceleration was nonzero. Neither of those applies to what you are suggesting.
     
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