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  2. QCD vacuum - Wikipedia

    en.wikipedia.org/wiki/QCD_vacuum

    The symmetry of the vacuum state is the diagonal SU(N f) part of the chiral group. The diagnostic for this is the formation of a non-vanishing chiral condensate ψ i ψ i , where ψ i is the quark field operator, and the flavour index i is summed. The Goldstone bosons of the symmetry breaking are the pseudoscalar mesons.

  3. Liouville field theory - Wikipedia

    en.wikipedia.org/wiki/Liouville_field_theory

    Liouville theory is defined for all complex values of the central charge of its Virasoro symmetry algebra, but it is unitary only if c ∈ ( 1 , + ∞ ) , {\displaystyle c\in (1,+\infty ),} and its classical limit is

  4. Bargmann–Wigner equations - Wikipedia

    en.wikipedia.org/wiki/Bargmann–Wigner_equations

    The operator constituting each equation, (−γ μ P μ + mc) = (−iħγ μ ∂ μ + mc), is a 4 × 4 matrix, because of the γ μ matrices, and the mc term scalar-multiplies the 4 × 4 identity matrix (usually not written for simplicity). Explicitly, in the Dirac representation of the gamma matrices: [1]

  5. Exact solutions in general relativity - Wikipedia

    en.wikipedia.org/wiki/Exact_solutions_in_general...

    Given the difficulty of constructing explicit small families of solutions, much less presenting something like a "general" solution to the Einstein field equation, or even a "general" solution to the vacuum field equation, a very reasonable approach is to try to find qualitative properties which hold for all solutions, or at least for all ...

  6. The best vacuums for allergies - AOL

    www.aol.com/news/best-vacuums-allergies...

    Simplicity Jill Canister Vacuum Cleaner $ at Amazon. ... This portable vacuum by DeWalt has a 4.7 rating from over 3,000 reviews. It may be small, but the model still includes attachments that a ...

  7. Loop quantum gravity - Wikipedia

    en.wikipedia.org/wiki/Loop_quantum_gravity

    Loop quantum cosmology (LQC) is a symmetry-reduced model of classical general relativity quantized using methods that mimic those of loop quantum gravity (LQG) that predicts a "quantum bridge" between contracting and expanding cosmological branches.

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