Recent content by mitchell porter

A previous paper by this author was discussed in this thread in posts #251-252, and the author himself appeared at #262. I commented on his research program here. Of all the ingredients in his calculation of fermion masses, the idea that I find the most credible, is that there might be some...

I can first name the two papers that I mentioned: "Path integral for the Hilbert-Palatini and Ashtekar gravity" (Alexandrov and Vassilevich 1998) "Generalized Symmetry in Dynamical Gravity" (Clifford Cheung et al 2024) Also see the last paragraph of this comment from last year. The 1998...

Fermion doubling is just one form of a broader phenomenon, in which de facto extra fermions are brought about by the existence of extra zero-energy modes or "zero modes" of a fermionic field. A version of this actually occurs in string theory - the number of generations produced by a Calabi-Yau...

This is a response to an article from five years ago (Chae et al 2020) claiming to detect an effect of MOND (the "external field effect") in a particular population of galaxies. The authors of the present paper say, if true this would be the first violation of general relativity detected, so...

I have no time to think about this, but I will just mention that coincidentally, a very similar issue came up in a physics discussion the other day. It was about Eric Weinstein's theory of everything, and the other person insisted that "any gravitational theory requires infinite higher spin...

I have not had time or mental space in which to think about it, but I've just noticed that a recent Clifford-algebra GUT paper from Portugal "Spacetime Grand Unified Theory" by Gonçalo M. Quinta mentions the Brannen parametrization of Koide! This is still sufficiently rare that we should try...

A dielectric is a substance made of electric dipoles which, when placed in an external electric field, reduces the electric field because its constituent dipoles line up and contribute their own opposing field. For some years, the astrophysicist Luc Blanchet has proposed to explain MOND via a...

I can't access any of those, but Dirac's paper is the subject of https://arxiv.org/abs/1902.10367, and SO(3,3)'s Lie algebra is discussed in https://doi.org/10.3390/sym12050817, and its double cover Spin(3,3) in https://doi.org/10.3390/particles6010008. I'm interested in ideas like these, but...

I've only scraped the surface of the paper, and still don't see a way to bring it into contact with supergravity. But there's a picture on page 12 (figure 5) that is useful for general understanding. At some level, Furey is talking about an algebra of 16x16 matrices. As this diagram shows...

Nichol Furey (best known for trying to get the standard model from the octonions) has now contributed to the genre of "getting the standard model, except for the top quark, from a nonstandard supersymmetric structure": "A Superalgebra Within: representations of lightest standard model particles...

If this were true, string theorists would talk about it all the time. Applications from string theory in material science and design? It is common to claim that the AdS/CFT duality from string theory, has applications in material science, so that part is somewhat justified. There are articles...

The author of this paper (Carlos Castro, now Carlos Castro Perelman), has over the decades written a large number of papers which discuss all kinds of advanced frontier topics in physics, but which themselves do not seem to be contributing results that are accepted and taken up by other authors...

Soft photons are very-low-energy photons. The low energy means that a single interaction can emit large numbers of them. There are various theorems (soft pion theorem, soft photon theorem, soft graviton theorem), all due to Weinberg I think, which describe how scattering amplitudes change, as...

I assume this is the comma notation for derivatives of tensors, but can't figure it out. Are you taking two partial derivatives of mu, one with respect to omega and one with respect to sigma?

Their most recent reference (December 2024) for the calculation says "Green's functions ... are obtained from the solution of a Schrödinger equation accounting for the exchange of potential gluons among the top and anti-top quark ... the ttbar pair transition into a quasi-bound state is...