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I Causal Fermion System and revival of Dirac Sea

  1. Mar 26, 2018 #1
    If the Higgs Field could exist with constant 246GeV across all of space. How come the Dirac Sea couldn't exist? If the Universe can easily accommodate Higgs Field.. why not Dirac Sea for all particles.

    Also how does the Dirac Sea of bosons work? Like W+, W-? Any idea?

    I was asking about the classical Dirac Sea.

    For modern Dirac Sea, there seems to be a revival

    "Dirac's original concept of a sea of particles was revived in the theory of causal fermion systems, a recent proposal for a unified physical theory. In this approach, the problems of the infinite vacuum energy and infinite charge density of the Dirac sea disappear because these divergences drop out of the physical equations formulated via the causal action principle.[9] These equations do not require a preexisting space-time, making it possible to realize the concept that space-time and all structures therein arise as a result of the collective interaction of the sea states with each other and with the additional particles and "holes" in the sea."

    What is the consensus of the experts? Is there no possibility for Dirac's original concept to be viable?

    How about Causal Fermion Systems? What do you think of it? What flaws can you see here that can bury the whole (old and modern idea of) Dirac Sea for good?
  2. jcsd
  3. Apr 1, 2018 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
  4. Apr 10, 2018 #3
    This is very elegant...
    "Instead of introducing physical objects on a preexisting space-time manifold, the general concept is to derive space-time as well as all the objects therein as secondary objects from the structures of an underlying causal fermion system."

    Couldn't this solve the cosmological constant problem? the Hierarchy problem, the naturalness problem of the Higgs vev and mass and even vacuum metastability in one blow?
  5. Apr 22, 2018 at 12:40 AM #4
    according to an authority: "The quantum vacuum is a particular state of quantum fields; it's not a "place" where quantum fields "exist in"."

    No problem about it. But in the May 2014 Sci-am article "Supersymmetry and the Crisis in Physics" it is described:

    "The Higgs may hold other clues. The discovery of the Higgs boson
    shows that there is a Higgs energy field turned on everywhere in
    the universe that gives mass to elementary particles. This means
    that the vacuum of “empty” space is a busy place, with both Higgs
    energy and virtual particles producing complicated dynamics.
    One might then wonder if the vacuum is really stable or if some
    unlucky quantum event could one day trigger a catastrophic transition
    from our universe to a clean slate."

    In the above, the "vacuum" is described as a "place". Is it just popularization?

    Or does it mean "quantum vacuum" is a state while "vacuum" is a place?

    How about the Dirac Sea according to Causal Fermion System. Is it a state or place?

    What BSM models or theories has the vaccum as a place instead of a state, and vice versa?
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