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Cosmological constant

  1. Jun 2, 2009 #1
    can someone tell me about the cosmological constant,its significance and 'god' particle?
  2. jcsd
  3. Jun 2, 2009 #2
    The cosmological constant, to my understanding, it's a fudge factor introduced by Einstein into GR. The reason behind this number panders to a deterministic/stable view of the universe: always there, always existed, not moving or going anywhere. Keep in mind that GR was developed before Hubble-Humason discovered the expansion of the universe. After that, the cosmological constant became "the greatest blunder" of Einstein's life. Refering to some kind of "theoretical physics oops", I suppose.

    In the late 90's, an awesome discovery was made regarding the expansion of the universe: it's accelerating. Which basically brought back attention to this whole "cosmological constant" deal.

    It's a very decently refined value, something like 74 km/s/mpc. What's driving the expansion? (in other words, what gives the CC it's value). A number of scientists turn to what's known as Dark Energy. A very interesting concept beyond the scope of this reply. Don't be surprised when reading up on DE; opinions are very much divided among the science community. Or at least, that's the impression I get.

    As for the "god particle" (I severely dislike those names), you might want to look into the Higgs particle. The Higgs particle is a boson that, among other things, gives "mass" to other particles. How does it work? I have no idea: all I know it's considered to be a field present in all of space-time. Finding this particle will pretty much confirm the standard model of particles, which predicts this guy in the first place.
  4. Jun 4, 2009 #3
    why does the fact that the universe accelerate bring back focus on this constant,because this constant was brought out keeping the stable view of universe
    ,right? does the higgs particle have its own mass,now what exactly does giving mass
    to other particles mean,since every particle we know has mass???.....
  5. Jun 4, 2009 #4
    Indeed, keep in mind that it serves a different purpose now. Before, it kept the universe static, now it's a placeholder [so to speak] for a measurable quantity that indicated that the universe is expanding.

    This is way beyond my league, sorry.


    http://en.wikipedia.org/wiki/Higgs_boson" [Broken]
    Last edited by a moderator: May 4, 2017
  6. Jun 4, 2009 #5
    You can read about the theoretical Higgs mechanism...it's a field(s) responsible for symmetry breaking among forces and particles...in other words, it's responsible for breaking unified high energy forces and particles, which are indistinguishable at high energies during the "big bang" , into apparently separate and distinct force carriers and matter particles which we observe today...

    In the same way that an electrogmaetic field provides a FORCE to electrically charged particles, but not neutral particles, a Higgs field gives some particles MASS (like protons and electrons)....but not others, which become force carriers (like photons and gravitons).
    The Higgs particle (that is the higgs field) has never been detected but there are hopes it might be when the new European collider gets up and running...
  7. Jun 6, 2009 #6
    gravity in verse levity

    “A positive vacuum energy density resulting from a cosmological constant implies a negative pressure, and vice versa. If the energy density is positive, the associated negative pressure will drive an accelerated expansion of empty space.”

    Cosmological constant acceleration is relative equivalent mathematical construct as space.time fluent pressure differential.

    Force is acceleration in verse fluent pressure differential.
    Energy is in verse (equal and opposite) mass by space.time constant.
    Mass accelerates toward relative velocity 0; energy holds v max.
    Mass holds force as attraction; energy holds force as repulsion.
    Gravity is in verse fluent pressure differential.

    Space flows and falls into mass.


    I do not Believe in force as dark epicycle in turn crystal sphere.
    Space.time dark.monkeys called by sum as graviton is a different story.
    All hail the god of gravitons.
    Please forgive.
  8. Jun 7, 2009 #7
    "cosmological constant" now appears to be somewhat of a misnomer...Hubble's discovery of an accelerating universe makes the idea of a "constant" rather unappealing....it's very likely it is NOT a constant as Einstein originally envisioned...dark energy, currently seen as the driving force behind expansion, may have a life of it's own analogous in some respects perhaps to radioactive decay at certain times and of powering expansion cycles of varying strengths at other times.

    In inflationary models of the universe, a period of faster than light expansion at the beginning moments is now supplemented by an unexplained expansion due to an unrelated energy source...dark energy.... which powers the current acceleration; In the Ekyprotic cyclic model of Steinhardt and Turok, Guth's inflation is replaced with varying modes of dark energy in a cyclic (repeating) model....also supported by Guth!!!..no infinite "big bang" is required...
  9. Jun 7, 2009 #8
    a – inflation.repulsion

    Attraction and repulsion are states by force.
    Force is acceleration in verse fluent pressure differential.
    Energy is in verse mass by space.time constant.

    Gravity is acceleration in verse fluent pressure differential.
    Inflation.repulsion is in verse same force by basic physics model.


    q - What happens as force as energy exceeds space.time constant?
    q - What happens as energy is re-released by countless suns over endless time?
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