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  1. M

    A Seeking the Standard Model in E8 plus Supersymmetry

    This is just a quick alert regarding a paper today https://arxiv.org/abs/2005.03048 Exceptional Unification of Families and Forces Alfredo Aranda, Francisco J. de Anda, Stephen F. King [Submitted on 6 May 2020] This work considers the remarkable suggestion that the three families of quarks and...
  2. M

    A Eric Weinstein's Geometric Unity theory

    Eric Weinstein finally released a video of his 2013 Oxford talk on "geometric unity". There are many fans and skeptics out there, looking in vain for a genuinely informed assessment of the idea. I admit that so far I have only skimmed the transcript of the video, being very pressed for...
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    A Donoghue's critique of asymptotic safety

    I have not read this paper yet, but Lubos Motl blogs about it here: "A serious critique of the real-world Asymptotic Safety program for quantum gravity". The points I would list in favor of asymptotic safety's significance and viability, may be found in this Physics Stack Exchange...
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    A Gravitational dressing in quantum field theory

    In quantum field theory, a dressed particle is a particle ("bare particle") considered in combination with certain secondary effects that it produces (e.g. the virtual pair creation involved in vacuum polarization). The dressed states are regarded as more physical, hence closer to reality. Axel...
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    A Explaining the Hubble tension with fundamental physics

    The Hubble tension or Hubble discrepancy is a contradiction between the Hubble constant as measured today, and the Hubble constant as measured in the early universe and extrapolated to today. @mfb recently listed the relevant measurements. There are some threads about this in the Cosmology...
  6. M

    A Double copies and the black hole electron

    Because they evaporate, quantum micro black holes resemble unstable elementary particles: you can create them by smashing stable particles together, and then they will decay back into particles, as if it was all just another scattering process. Certainly in string theory, elementary particles...
  7. M

    A Froggatt & Nielsen: top-Higgs blobs explain everything

    Summary: Nonperturbative top-Higgs effects proposed to explain all violations of lepton universality Three years ago, Froggatt & Nielsen wanted to explain the, apparently spurious, 750 GeV resonance as top quarks bound, not just by the gluonic strong force, but also by the 'Higgs force', which...
  8. M

    Mass in motivic quantum gravity

    From the proceedings of Group32, the 32nd International Colloquium on Group Theoretical Methods in Physics (9–13 July 2018, Prague): https://iopscience.iop.org/article/10.1088/1742-6596/1194/1/012097 M D Sheppeard Abstract: A physical approach to a category of motives must account for the...
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    A Masses from modular symmetry

    One of the interesting new ideas in BSM model building began with this paper: https://arxiv.org/abs/1706.08749 Are neutrino masses modular forms? Ferruccio Feruglio A modular form is a kind of two-dimensional analogue of the periodic trigonometric functions. Just as trigonometric functions can...
  10. M

    A New model of high-spin Baryons

    They are described here as (2+1)-dimensional sheets of eta-prime condensate, with the valence quarks on the boundary. One amazing detail is that, because it is a lower-dimensional object, the quarks are anyons! This description is said to apply most immediately to single-flavor baryons like ∆++...
  11. M

    A Fine structure and fixed points

    I apologize for creating a new thread which has significant overlap with two other ongoing threads ("Quantization isn't fundamental", "Atiyah's arithmetic physics"). But both those threads discuss theories or paradigms of extreme breadth, whereas here I want to focus on a very specific bundle of...
  12. M

    A Baroque neutrinos and Zee-Babu model

    https://arxiv.org/abs/1810.01000 MiniBooNE, MINOS+ and IceCube data imply a baroque neutrino sector Jiajun Liao, Danny Marfatia, Kerry Whisnant (Submitted on 1 Oct 2018) The 4.8σ anomaly in MiniBooNE data cannot be reconciled with MINOS+ and IceCube data within the vanilla framework of neutrino...
  13. M

    A Atiyah's arithmetic physics

    Sir Michael Atiyah just gave a livestreamed talk claiming to prove the Riemann hypothesis. But it turns out that this is part of a larger research program in which he also claims to have an apriori calculation of the fine-structure constant and possibly other physical constants. Atiyah is 89...
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    A Numerology from Vafa and Visser

    http://arxiv.org/abs/1808.03483 Theta-problem and the String Swampland Sergio Cecotti, Cumrun Vafa (Submitted on 10 Aug 2018) In the context of N=2 supergravity without vector multiplets coupled to hypermultiplets, the coupling constant of graviphoton τ is apriori a free parameter. Stringy...
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    A A standard model wormhole?

    Apparently the Internet hasn't noticed this paper yet: http://arxiv.org/abs/1807.04726 Traversable wormholes in four dimensions Juan Maldacena, Alexey Milekhin, Fedor Popov (Submitted on 12 Jul 2018) We present a wormhole solution in four dimensions. It is a solution of an Einstein Maxwell...
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    A Pressure in the proton, from gravitational form factors?

    A paper in Nature is getting some press, for having calculated "the pressure distribution inside the proton". But the theory behind the calculation seems a little odd. Apparently the data pertains to the scattering of an electron from a quark via the exchange of two photons. But each photon...
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    A New perspectives on M-theory

    PF regular @Urs Schreiber has coauthored a new paper: http://arxiv.org/abs/1805.00233 Higher T-duality in M-theory via local supersymmetry Hisham Sati, Urs Schreiber (Submitted on 1 May 2018) By analyzing super-torsion and brane super-cocycles, we derive a new duality in M-theory, which takes...
  18. M

    A Shaposhnikov and Hossenfelder, Higgs and MOND

    We had two papers yesterday making big claims in the realm of minimal BSM theory. http://arxiv.org/abs/1803.08907 Conformal symmetry: towards the link between the Fermi and the Planck scales Mikhail Shaposhnikov, Andrey Shkerin (Submitted on 23 Mar 2018) If the mass of the Higgs boson is put...
  19. M

    A "UV completion of a theory of Superfluid Dark Matter"

    http://arxiv.org/abs/1801.04083 UV completion of a theory of Superfluid Dark Matter Andrea Addazi, Antonino Marciano (Submitted on 12 Jan 2018) We show that a model of superfluid dark matter, modifying the Newtonian potential and explaining galactic rotational curves, can be unitarized by the...
  20. M

    A Joseph Polchinski's physics autobiography

    I'm posting here, because this memoir is actually full of comments about interesting BSM physics too. https://arxiv.org/abs/1708.09093 Memories of a Theoretical Physicist Joseph Polchinski (Submitted on 30 Aug 2017) While I was dealing with a brain injury and finding it difficult to work...
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    A Does Shaposhnikov & Wetterich 2009 have a hierarchy problem?

    A thread for discussing this issue (and related topics). The first question I have is, how to define the theory under consideration? Asymptotic safety has only been proven for some truncations of general relativity; if we take one of those truncations, and couple it to one of those minimal...
  22. M

    A Representation theory of supersymmetry

    I had heard of adinkras but didn't realize that they were meant to play this role. Nor did I realize that the representation theory of supersymmetry is mathematically underdeveloped.
  23. M

    A Recent papers on particle masses

    http://arxiv.org/abs/1612.03825 Towards a new paradigm for quark-lepton unification Christopher Smith (Submitted on 12 Dec 2016) My comments: This is my favorite. It is a modification of Minimal Flavor Violation (MFV), a popular philosophy which posits that any BSM couplings may only involve...
  24. M

    A Towards a dS/MERA correspondence

    http://arxiv.org/abs/1611.08581 Towards a dS/MERA correspondence Raj Sinai Kunkolienkar, Kinjal Banerjee (Submitted on 25 Nov 2016) Recent advances have suggested that spacetime itself emerges from the entanglement of the quantum degrees of freedom living on the boundary. In the case of the AdS...
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    A String theory made E-Z

    Move over, M- theory and F-theory! http://arxiv.org/abs/1609.06863 A brief review of E theory Peter West (Submitted on 22 Sep 2016) I begin with some memories of Abdus Salam who was my PhD supervisor. After reviewing the theory of non-linear realisations and Kac-Moody algebras, I explain...
  26. M

    A Kahana and Kahana predicted Higgs mass, top mass in 1993

    In 2009, Shaposhnikov and Wetterich successfully predicted the Higgs boson mass, by assuming that quantum gravity is asymptotically safe. Asymptotic safety remains a minority research program, but the paper itself is now well-known among people studying the metastability of the electroweak...
  27. M

    A Tension between local and CMB measurements of Hubble constant

    "A 2.4% Determination of the Local Value of the Hubble Constant" by Riess et al has led to some excited news stories recently. I don't see it discussed anywhere here. Looking for the essence of the paper, I note three things: The two measurements considered are "the Hubble constant ... measured...
  28. M

    A Higgs-top resonances

    I was thinking about the possible 750 GeV resonance, and the joke idea that it could be a bound state of six Higgs bosons, and I suddenly realized that Higgs bosons might feel a "top force" (from top loops) because the top yukawa is so big. Has anyone calculated this?
  29. M

    A Koide, neutrinos, and phenomenology

    Compared to the other fermions, I have always had much less interest in Koide mass formulas for neutrinos. There is less data, and neutrino mass works differently anyway (Dirac plus Majorana, whereas the other fermions are just Dirac). But today that has changed. First, today we have a paper...
  30. M

    Our world as a typical F-theory vacuum?

    This paper presents an unusually concrete hypothesis about the string theory landscape - that it is numerically dominated by "flux vacua" arising from a single compactification manifold. And our world could be one of them. http://arxiv.org/abs/1511.03209 The F-theory geometry with most flux...
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