Physicist finds loose thread of string theory puzzle:

Discussion in 'Physics & Math' started by paddoboy, Jul 3, 2019.

  1. paddoboy Valued Senior Member

    Messages:
    27,543
    https://phys.org/news/2019-07-physicist-loose-thread-theory-puzzle.html

    A University of Colorado Boulder physicist is one step closer to solving a string theory puzzle 20 years in the making.

    Paul Romatschke, an associate professor of physics at CU Boulder, has devised an alternative set of tools to those that created string theory's three-quarters dilemma, a mathematical puzzle that has plagued scientists for years and has kept them from fully understanding and proving this possible "theory of everything."

    While not necessarily applicable to the everyday world, the results, which were published this week in Physical Review Letters, open the door for higher-level equations that could have implications on the way we approach and understand important aspects of physics like string theory or quantum field theories, which are a set of theories in physics that describe the dynamics of fields, or objects that permeate everything.

    more at link.....

    the paper:

    https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.231603

    Finite-Temperature Conformal Field Theory Results for All Couplings: O(N) Model in 2+1Dimensions:

    ABSTRACT:
    A famous example of gauge-gravity duality is the result that the entropy density of the strongly coupled N=4 supersymmetric Yang-Mills theory in four dimensions for large N is exactly 3/4 of the Stefan-Boltzmann limit. In this work, I revisit the massless O(N) model in 2+1dimensions, which is analytically solvable at a finite-temperature T for all couplings λ in the large N limit. I find that the entropy density monotonically decreases from the Stefan-Boltzmann limit at λ=0 to exactly 4/5 of the Stefan-Boltzmann limit at λ=∞. Calculating the retarded energy-momentum tensor correlator in the scalar channel at λ=∞, I find that it has two logarithmic branch cuts originating at ω=±4Tln(1+√5/2) but no singularities in the whole complex frequency plane. I show that the ratio 4/5 and the location of the branch points both are universal within a large class of bosonic conformal field theories in 2+1 dimensions.
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    String theory and its derivitives! I'd nearly forgotten about them!!

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  3. Vmedvil Registered Member

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    94
    The Couplings on String Theory can be difficult but far from impossible there are anomalies in String Theory besides E8 x E8 SO(32) some of the variants of string theory have serious issues but not all do not judge the higher String Theories of M-Theory based on problems with the lesser ones. Honestly, I think the lesser String Theories with anomalies should just be thrown out as failures rather than attempted to be fixed, but no one listens to me.
     
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