samedi 30 mai 2015

Testing if the Higgs mechanism is a natural part of (the) quantum gravit(ational geometrization of ph)y(sics) at LHC 2?

The unnatural effectiveness of the standard model for particle physics phenomenology
The periphysicist / blogger pursues his quest for beyond standard model physics staying tuned to the music of spheres. Excited like all science enthusiasts by the starting of LHC Season 2 he's focusing today on one of the still few particle phenomenological works (already reported in a former post) that could offer hope for a testable bottom-up approach to the spectral noncommutative geometrization of physics at LHC . Let's start with the first slide of a parallel talk at 20th International Symposium on Particles, Strings and Cosmology, presented by Ufuk AYDEMIR:

Questioning our intuition of naturalness based on local effective field theory
We carry on with two excerpts from the last published article dealing with the same issue as above:
... [the] apparent theoretical appeal of supersymmetry does not exclude approaches that do not necessarily follow the local effective field theory (EFT) paradigm. For example, in the Spectral Standard Model (SM) approach of Connes et al. [29, 5764] the hierarchy problem can be addressed in a completely different fashion [62]. The crucial noncommutative geometry (NCG) (and thus in some sense non-local) aspect of the SM is found in the Higgs sector, which in principle comes with an extra (second) scale, to be distinguished from the usual UV scale of local EFT. The hierarchy between the Higgs and the UV (Planck) scale can be associated (as shown by Chamseddine and Connes in Ref. [62]) with the natural exponential factor that comes from the dynamical discrete geometry of the Higgs sector. Similarly, the apparent gauge unification (in the guise of an effective SO(10) relation between the gauge couplings) is also incorporated into the Spectral SM
(last revised 5 Mar 2015 (this version, v3))

Can particle physics phenomenology dates the spectral standard model?
These aspects of the NCG approach to the SM are almost completely unknown in the particle physics community, and at the moment, almost completely undeveloped from a phenomenological viewpoint. One of our aims in our upcoming review of the Spectral SM [71] is to clarify these interesting features of the NCG approach to the SM and make them palatable to the wider phenomenological community. We are also motivated by a deeper need to understand the limitations of the local EFT paradigm from the point of view of the physics of quantum gravity, which is usually, rather naively, ignored at the currently interesting particle physics scales, by invoking the concept of decoupling, which represents another central feature of the local EFT and which is also challenged by the NCG approach to the SM. Finally, as we discuss in the next concluding subsection of this paper, the usual RG analysis of the local EFT should be re-examined in the new light of the non-commutative/non-local structure of the SM, and the apparent existence of two natural (and naturally related) physics scales.  

Does the superconnection formalism cry for noncommutative geometry?
This is basically the question answered in the following slides from one of the authors of the text that has been quoted before:

Chen SUN, 4/5/2015 

Rendez-vous at a 4 TeV Left-Right symmetry breaking scale ?
This seems the basic prediction of the superconnection formalism worked out by the authors of the study exposed here as indicated in the last slide of the first talk this post has started with: 

The hidden geometry of the Standard Model from superconnections and TeV scale left-right symmetric model as new physics, Ufuk AYDEMIR 24 Jun 2014

\\Last edit on 31 May 2015
Of course this prediction about a possible 4TeV left-right symmetric model with a discrete extra dimension in the spectral noncomutative's way has to be taken with a pinch of salt. We end this post reviewing some pros and cons following another coworker Tatsu Takeuchi: 

Tatsu Takeuchi Virginia Tech March 26, 2014

lundi 11 mai 2015

The (spectral classical) standard model is the almost unique solution to the (noncommutative equation of) quantization of (4D Euclidean) spacetime

Hindsight from zeptospace
The theoretical physicist Ali Chamseddine conveys in a colloquial way the idea behind this statement (roughly made at 54'32'') in the following recent lecture footage which is a counterpart (susy-sugra-stringy-M-theory friendly, watch at 1h02'10'' and 1h20'10'' ;-) to the more hieratic (more mesmerizing) one by the mathematician Alain Connes mentioned in a former post. 

Quanta of Geometry (slides) by Ali Chamseddine
May 4 – 8, 2015 at Simons Center for Geometry and physics

Insight into zettaspace?
Here are the last slides where one can show that the complete solution to the more concrete quantization of the (3+1)D space-time could also give a hint to solve the inflation-dark matter-dark energy conundrum:

To the interested reader (not a regular one of this blog) here are the two published articles where the material briefly publicized above is fully presented :  the theoretical physicist-summary and the mathematical physics-demonstration.
It is interesting to notice the presence among the authors of both articles, out of the mathematician and the theoretical physicist already mentioned, the presence of a specialist in quantum cosmology (Sacha Mukhanov). Thus one may hope for a sequel about a testable phenomenology one day. The blogger stays alert.

//post re-edited on 14 May 2015