The Gauge Connection

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109 posts · 132,169 views

I discuss most recent findings in the area of QCD and strong interactions in the low-energy limit. This involves lattice computations of the spectrum, the problem of the mass gap and existence of Yang-Mills theory.

Marco Frasca
109 posts

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  • April 20, 2011
  • 05:53 PM
  • 1,530 views

Chiral condensates in a magnetic field: Accepted!

by Marco Frasca in The Gauge Connection

As my readers could know, I have had a paper written in collaboration with Marco Ruggieri (see here). Marco is currently working at Yukawa Institute in Kyoto (Japan). The great news is that our paper has been accepted for publication on Physical Review D. I am really happy for this very good result of a [...]... Read more »

Philippe de Forcrand. (2010) Simulating QCD at finite density. PoS (LAT2009)010, 2009. arXiv: 1005.0539v2

  • April 20, 2011
  • 09:28 AM
  • 1,439 views

A simpler explanation for the CDF bump

by Marco Frasca in The Gauge Connection

A lot of fuss arose about the recent almost finding of a new particle at Tevatron (see here). Several exotic hypotheses were put forward mostly looking for physics beyond Standard Model. Of course, being there such a bump at about , we cannot yet cry out for a discovery and more mundane explanations could exist. [...]... Read more »

  • April 8, 2011
  • 05:14 AM
  • 1,749 views

Today in arXiv

by Marco Frasca in The Gauge Connection

After the excitation for the findings at Tevatron, we turn back to routine. Of course, I have never forgotten to cast a glance at arXiv where it is crystal clear the vitality of the physics community. I want to put down these few lines to point to your attention a couple of papers appeared today [...]... Read more »

J. R. Andersen, O. Antipin, G. Azuelos, L. Del Debbio, E. Del Nobile, S. Di Chiara, T. Hapola, M. Jarvinen, P. J. Lowdon, Y. Maravin.... (2011) Discovering Technicolor. arXiv. arXiv: 1104.1255v1

  • April 6, 2011
  • 03:45 AM
  • 1,588 views

A new particle at Fermilab?

by Marco Frasca in The Gauge Connection

I am a registered reader at New York Times and subscribed Dennis Overbye‘s articles. So, this morning I received the mail form the journal with a new writing from Dennis. The title is “At Particle Lab, a Tantalizing Glimpse Has Physicists Holding Their Breaths”. I just jumped on my chair and then, eagerly, read the [...]... Read more »

  • April 5, 2011
  • 04:16 AM
  • 1,648 views

QCD at finite temperature: Does a critical endpoint exist?

by Marco Frasca in The Gauge Connection

Marco Ruggieri is currently a post-doc fellow at Yukawa Institute for theoretical physics in Kyoto (Japan). Marco has got his PhD at University of Bari in Italy and spent a six months period at CERN. Currently, his main research areas are QCD at finite temperature and high density, QCD behavior in strong magnetic fields and [...]... Read more »

Rajan Gupta. (2011) Equation of State from Lattice QCD Calculations. arXiv. arXiv: 1104.0267v1

Philippe de Forcrand. (2010) Simulating QCD at finite density. PoS (LAT2009)010, 2009. arXiv: 1005.0539v2

Z. Fodor, & S. D. Katz. (2001) Lattice determination of the critical point of QCD at finite T and \mu. JHEP 0203 (2002) 014. arXiv: hep-lat/0106002v2

  • March 29, 2011
  • 09:00 AM
  • 1,357 views

CUDA: Upgrading to 3 Tflops

by Marco Frasca in The Gauge Connection

When I was a graduate student I heard a lot about the wonderful performances of a Cray-1 parallel computer and the promises to explore unknown fields of knowledge with this unleashed power. This admirable machine reached a peak of 250 Mflops. Its near parent, Cray-2, performed at 1700 Mflops and for scientists this was indeed [...]... Read more »

Nuno Cardoso, & Pedro Bicudo. (2010) SU(2) Lattice Gauge Theory Simulations on Fermi GPUs. J.Comput.Phys.230:3998-4010,2011. arXiv: 1010.4834v2

  • March 22, 2011
  • 07:47 AM
  • 1,345 views

Low-energy effective Yang-Mills theory

by Marco Frasca in The Gauge Connection

As usual I read the daily from arxiv and often it happens to find very interesting papers. This is the case for a new paper from Kei-Ichi Kondo. Kondo was in Ghent last year (here his talk) and I have had the chance to meet him. His research is on very similar lines as mine. [...]... Read more »

Marco Frasca. (2010) Glueball spectrum and hadronic processes in low-energy QCD. Nucl.Phys.Proc.Suppl.207-208:196-199,2010. arXiv: 1007.4479v2

Marco Frasca. (2008) Infrared QCD. International Journal of Modern Physics E 18, (2009) 693-703. arXiv: 0803.0319v5

Attilio Cucchieri, & Tereza Mendes. (2009) Landau-gauge propagators in Yang-Mills theories at beta . Phys.Rev.D81:016005,2010. arXiv: 0904.4033v2

  • March 21, 2011
  • 06:48 AM
  • 1,847 views

Sidney Coleman’s QFT lectures

by Marco Frasca in The Gauge Connection

This post is just to point out to my readers that the lectures of Sidney Coleman on QFT are now available in TeX and pdf format. I have taken this information from Lubos’ site. The link for the full pdf is this. For this excellent work the person to be grateful is Bryan Chen a [...]... Read more »

Coleman, S. (1977) There are no classical glueballs. Communications in Mathematical Physics, 55(2), 113-116. DOI: 10.1007/BF01626513  

  • March 15, 2011
  • 01:27 PM
  • 1,662 views

CUDA: Lattice QCD at your desktop

by Marco Frasca in The Gauge Connection

As my readers know, I have built up a CUDA machine on my desktop for few bucks to have lattice QCD at my home. There are a couple of reasons to write this post and the most important of this is that Pedro Bicudo and Nuno Cardoso have got their paper published on an archival [...]... Read more »

Nuno Cardoso, & Pedro Bicudo. (2011) SU(2) Lattice Gauge Theory Simulations on Fermi GPUs. Journal of Computational Physics. info:/10.1016/j.jcp.2011.02.023

Rafael B. Frigori. (2009) Screening masses in quenched (2 1)d Yang-Mills theory: universality from dynamics?. Nuclear Physics B, Volume 833, Issues 1-2, 1 July 2010, Pages 17-27. arXiv: 0912.2871v2

Marco Frasca. (2010) Mapping theorem and Green functions in Yang-Mills theory. PoS(FacesQCD)039, 2011. arXiv: 1011.3643v3

  • March 9, 2011
  • 05:32 AM
  • 1,381 views

No scaling solution with massive gluons

by Marco Frasca in The Gauge Connection

Some time ago, while I was just at the beginning of my current understanding of low-energy Yang-Mills theory, I wrote to Christian Fischer to know if from the scaling solution, the one with the gluon propagator going to zero lowering momenta and the ghost propagator running to infinity faster than the free particle in the [...]... Read more »

  • March 8, 2011
  • 05:51 AM
  • 1,373 views

Chiral condensates in a magnetic field: A collaboration

by Marco Frasca in The Gauge Connection

So far, it is more than twenty years that I publish in refereed journals and, notwithstanding a lot of exchange with my colleagues, I have never had the chance to work in a collaboration.  The opportunity come thanks to Marco Ruggieri (see here). Me and Marco met in Gent at the Conference “The Many faces [...]... Read more »

  • March 1, 2011
  • 10:59 AM
  • 1,213 views

Back to Earth

by Marco Frasca in The Gauge Connection

Nature publishes, in the last issue, an article about SUSY and LHC (see here).  The question is really simple to state. SUSY (SUperSYmmetry) is a solution to some problems that plagued physics for some time. An important question is the Higgs particle. In order to have the Standard Model properly working, one needs to fine [...]... Read more »

  • February 28, 2011
  • 07:13 AM
  • 773 views

A day as a physicist

by Marco Frasca in The Gauge Connection

I speak often in my blog about technical matters as I believe these represent the most important part of my intellectual activity. Indeed, my work is so extended in so much areas of physics due to the fact that I am largely involved about problematics of theoretical physics. So, I would like to tell you [...]... Read more »

D. Ebert. (1997) Bosonization in Particle Physics. arxiv. arXiv: hep-ph/9710511v1

Marco Frasca. (2010) Glueball spectrum and hadronic processes in low-energy QCD. Nucl.Phys.Proc.Suppl.207-208:196-199,2010. arXiv: 1007.4479v2

  • February 21, 2011
  • 07:07 AM
  • 1,771 views

Igor Suslov and the beta function of the scalar field

by Marco Frasca in The Gauge Connection

I think that blogs are a very good vehicle for a scientist to let his/her work widely known and can be really helpful also for colleagues doing research in the same field. This is the case of Igor Suslov at Kapitza Institute in Moscow. Igor is doing groundbreaking research in quantum field theory and, particularly, [...]... Read more »

I. M. Suslov. (2011) Renormalization Group Functions of \phi^4 Theory from High-Temperature Expansions. J.Exp.Theor.Phys., v.112, p.274 (2011); Zh.Eksp.Teor.Fiz., v.139, p.319 (2011). arXiv: 1102.3906v1

  • February 18, 2011
  • 08:43 AM
  • 2,015 views

Ashtekar and the BKL conjecture

by Marco Frasca in The Gauge Connection

Abhay Ashtekar is a well-known Indian physicist working at Pennsylvania State University. He has produced a fundamental paper in general relativity that has been the cornerstone of all the field of research of loop quantum gravity. Beyond the possible value that loop quantum gravity may have, we will see in the future, this result of [...]... Read more »

Abhay Ashtekar, Adam Henderson, & David Sloan. (2011) A Hamiltonian Formulation of the BKL Conjecture. arxiv. arXiv: 1102.3474v1

Marco Frasca. (2005) Strong coupling expansion for general relativity. Int.J.Mod.Phys. D15 (2006) 1373-1386. arXiv: hep-th/0508246v3

  • February 10, 2011
  • 06:56 AM
  • 1,085 views

QCD at strong magnetic fields

by Marco Frasca in The Gauge Connection

Today on arxiv it is appeared the contribution to the conference “The many faces of QCD” of my friend Marco Ruggieri. Marco is currently a postdoc student at Yukawa Institute in Tokyo and has been a former student of Raoul Gatto. Gatto is one of the most known Italian physicists that had as students also [...]... Read more »

  • February 8, 2011
  • 06:17 AM
  • 987 views

A striking clue and some more

by Marco Frasca in The Gauge Connection

My colleagues participating to “The many faces of QCD” in Ghent last year keep on publishing their contributions to the proceedings. This conference produced several outstanding talks and so, it is worthwhile to tell about that here. I have already said about this here, here and here and I have spent some words about the [...]... Read more »

Silvio P. Sorella, David Dudal, Marcelo S. Guimaraes, & Nele Vandersickel. (2011) Features of the Refined Gribov-Zwanziger theory: propagators, BRST soft symmetry breaking and glueball masses. arxiv. arXiv: 1102.0574v1

N. Vandersickel,, D. Dudal,, & S.P. Sorella. (2011) More evidence for a refined Gribov-Zwanziger action based on an effective potential approach. arxiv. info:/1102.0866

Axel Maas. (2011) Scalar-matter-gluon interaction. arxiv. arXiv: 1102.0901v1

  • February 4, 2011
  • 02:07 PM
  • 1,137 views

CUDA: An update

by Marco Frasca in The Gauge Connection

My activity with CUDA technology by Nvidia and parallel computing is going on (see here).  I was able to get up and running the code made available by Pedro Bicudo and Nuno Cardoso (see here) on my machine. This is a code for SU(2) QCD and, currently, these colleagues are working on the SU(3) version. [...]... Read more »

  • February 3, 2011
  • 05:38 AM
  • 1,008 views

The Gribov obsession

by Marco Frasca in The Gauge Connection

I have treated the question of Yang-Mills propagators in-depth in my blog being one of my main concerns. There is an important part of the scientific community aimed to understand how these functions behave both at lower energies and overall on the whole energy range. The motivation to write down these few lines today arises [...]... Read more »

  • February 1, 2011
  • 06:37 AM
  • 767 views

A wonderful confirmation

by Marco Frasca in The Gauge Connection

Contributions to proceedings to Ghent conference “The many faces of QCD” are starting to appear on arxiv and today appeared one of the most striking one I have heard of at that conference: Orlando Oliveira, Pedro Bicudo and Paulo Silva published their paper (see here). This paper represents a true cornerstone for people doing computations [...]... Read more »

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