Recent content by mitchell porter

The theorem is a statement about the S-matrix of a QFT with interactions. One interpretation is that if you have hybrid symmetries, you can't have interactions. See the last two comments in this thread...

"Gravity and electroweak sector from symmetry breaking of an SO(3,3) BF theory" (Wesley, Singh, Isidro) It seems the authors have developed the idea as an offshoot of Tejinder Singh's theory of everything, but this paper does also stand alone. My own comments on this concept are in #5 of this...

I am very short of time so I will just briefly note "Generating the fermion mass hierarchy at the TeV scale" (Arkani-Hamed et al) I can't think of another paper by Arkani-Hamed that tries to explain the distribution of fermion masses (as opposed to e.g. the origin of the Fermi scale as a...

There's a paper from Iran making a startling claim that at least survives initial scrutiny: "GR from RG: Gravity Is Induced From Renormalization Group Flow In The Infrared" (Sheikh-Jabbari, Taghiloo) There is an old idea due to Sakharov, called induced gravity, according to which there might...

"A Z3-symmetric Quantum Chromodynamics" by Richard Kerner, a French physicist now in his 80s who has published in almost every area of fundamental physics. Here he is writing down a generalized Dirac equation in which a quark color triplet (red, green, blue states) is described by a 12-component...

1) "Unified analysis of screening masses for vector and axial-vector mesons and their diquark partners in the Contact Interaction model" discusses masses of constituent quarks (page 4, Table II), mesons (Tables III-VII), and diquarks (page 13, Table VIII). The constituent masses are described as...

There's a paper from Shandong University in China which I think will be my approach to the neutrino masses going forwards, at least when thinking within the framework of the waterfall. "Further study on the lepton mass spectra and flavor mixing with S_3L x S_3R flavor symmetry" (Hu, Li, Liang...

It turns out that the 500-page paper had a forerunner in 2000 that's just 100 pages, so it might be easier to read. :-) "de Sitter Space as a Glauber-Sudarshan State" (Brahma, Dasgupta, Tatar) This paper starts with a review of the De Sitter debate in quantum gravity and string theory. The...

An anonymous string theorist ("Stringmaster") showed up at Peter Woit's blog to state an abbreviated version of what they think this century's progress in string theory has been about: https://www.math.columbia.edu/~woit/wordpress/?p=15348#comment-252759 To me, the prose looks like it's been...

Do you remember what prompt you used to generate that image? Gizmodo recently ran an article asking "whatever happened to string theory?" My comment: "In general, the biggest thing that happened is that nothing but the Higgs boson showed up at the LHC. This all but falsified what had been...

I don't know about Manin, but complex gauge theory has seen use in pure math, e.g. in the Hitchin fibration (also known as the theory of Higgs bundles). But that's just the classical theory (and in 2D). Regarding the quantum theory: No, that's all still true. There are a handful of cases...

I thought of posting this under Particle Physics, but it does go slightly beyond standard model, and in a way that could point to some larger theories, so I post it here. "A path to confine gluons and fermions through complex gauge theory" (Amaral et al 2020) "New picture on the mesons mass...

Just to be clear, I claimed the problem was that chiral gravi-GUTs want to use SU(2)R as the gravitational gauge group, but in Pati-Salam you also need it to supply part of U(1)Y, the hypercharge gauge group in the standard model. Alexander et al's approach is to abandon that part of Pati-Salam...

I think the summary in Sabine Hossenfelder's new video is excellent. Many important points made, I have bolded two at the end that interest me the most: "The Nobel Prize winning observation heavily relied on regularities of [Type 1a] supernovae. They assumed that these stellar explosions...

Formally you could do it but that's not really a gravi-GUT any more, or at least the gravitational SU(2)R is no longer united with the observed forces. You just have SO(10)_1 x SO(10)_2, the first SO(10)_1 is a standard SO(10) GUT whose breaking passes through standard Pati-Salam, and then the...