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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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 »

Marco Frasca, & Marco Ruggieri. (2011) Magnetic Susceptibility of the Quark Condensate and Polarization from Chiral Models. arXiv. arXiv: 1103.1194v1

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

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 »

CDF Collaboration, & T. Aaltonen. (2011) Invariant Mass Distribution of Jet Pairs Produced in Association with a W boson in ppbar Collisions at sqrt(s) . arXiv. arXiv: 1104.0699v1

Zack Sullivan, & Arjun Menon. (2011) A standard model explanation of a CDF dijet excess in Wjj. arXiv. arXiv: 1104.3790v1

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 »

Nele Vandersickel. (2011) A study of the Gribov-Zwanziger action: from propagators to glueballs. arXiv. arXiv: 1104.1315v1

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

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 »

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

M. Asakawa, & K. Yazaki. (1989) Chiral restoration at finite density and temperature. Nuclear Physics A, 504(4), 668-684. DOI: 10.1016/0375-9474(89)90002-X

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

Marco Ruggieri. (2011) The Critical End Point of Quantum Chromodynamics Detected by Chirally Imbalanced Quark Matter. arXiv. arXiv: 1103.6186v1

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

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 »

Kei-Ichi Kondo. (2011) A low-energy effective Yang-Mills theory for quark and gluon confinement. arxiv. arXiv: 1103.3829v1

Kei-Ichi Kondo. (2010) Toward a first-principle derivation of confinement and chiral-symmetry-breaking crossover transitions in QCD. Phys. Rev. D 82, 065024 (2010) . arXiv: 1005.0314v2

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

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

Marco Frasca. (2009) Exact solutions of classical scalar field equations. arxiv. arXiv: 0907.4053v2

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

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 »

J. Rodríguez-Quintero. (2011) The scaling infrared DSE solution as a critical end-point for the family of decoupling ones. arxiv. arXiv: 1103.0904v1

J. Rodríguez-Quintero. (2010) On the massive gluon propagator, the PT-BFM scheme and the low-momentum behaviour of decoupling and scaling DSE solutions. JHEP 1101:105,2011. arXiv: 1005.4598v2

Daniele Binosi, & Joannis Papavassiliou. (2007) Gauge-invariant truncation scheme for the Schwinger-Dyson equations of QCD. Phys.Rev.D77:061702,2008. arXiv: 0712.2707v1

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 »

Marco Frasca, & Marco Ruggieri. (2011) Magnetic Susceptibility of the Quark Condensate and Polarization from Chiral Models. arxiv. arXiv: 1103.1194v1

RITUS, V. (1972) Radiative corrections in quantum electrodynamics with intense field and their analytical properties. Annals of Physics, 69(2), 555-582. DOI: 10.1016/0003-4916(72)90191-1

C. N. Leung, & S. -Y. Wang. (2005) Gauge independent approach to chiral symmetry breaking in a strong magnetic field. Nucl.Phys.B747:266-293,2006. arXiv: hep-ph/0510066v3

P. V. Buividovich, M. N. Chernodub, E. V. Luschevskaya, & M. I. Polikarpov. (2009) Chiral magnetization of non-Abelian vacuum: a lattice study. Nucl.Phys.B826:313-327,2010. arXiv: 0906.0488v2

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 »

The ATLAS Collaboration. (2011) Search for supersymmetry using final states with one lepton, jets, and missing transverse momentum with the ATLAS detector in sqrt{s} . arxiv. DOI: 1102.2357

CMS Collaboration. (2011) Search for Supersymmetry in pp Collisions at 7 TeV in Events with Jets and Missing Transverse Energy. arxiv. arXiv: 1101.1628v1

The ATLAS Collaboration. (2011) Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in sqrt(s) . arxiv. arXiv: 1102.5290v1

Marco Frasca. (2010) Mass generation and supersymmetry. arxiv. arXiv: 1007.5275v2

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

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

Marco Frasca. (2008) Infrared behavior of the running coupling in scalar field theory. arxiv. arXiv: 0802.1183v4

Marco Frasca. (2010) Mapping theorem and Green functions in Yang-Mills theory. arxiv. arXiv: 1011.3643v2

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 »

Ashtekar, A. (1986) New Variables for Classical and Quantum Gravity. Physical Review Letters, 57(18), 2244-2247. DOI: 10.1103/PhysRevLett.57.2244

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

Frasca, M. (1992) Strong-field approximation for the Schrödinger equation. Physical Review A, 45(1), 43-46. DOI: 10.1103/PhysRevA.45.43

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 »

Marco Ruggieri. (2011) Chiral symmetry restoration and deconfinement in strong magnetic fields. arxiv. arXiv: 1102.1832v1

Kondo, K. (2010) Toward a first-principle derivation of confinement and chiral-symmetry-breaking crossover transitions in QCD. Physical Review D, 82(6). DOI: 10.1103/PhysRevD.82.065024

FRASCA, M. (2009) INFRARED QCD. International Journal of Modern Physics E, 18(03), 693. DOI: 10.1142/S0218301309012781

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

Frasca, M. (2006) Strongly coupled quantum field theory. Physical Review D, 73(2). DOI: 10.1103/PhysRevD.73.027701

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 »

Frigori, R. (2010) Screening masses in quenched (2 1)d(2 1)d Yang–Mills theory: Universality from dynamics?. Nuclear Physics B, 833(1-2), 17-27. DOI: 10.1016/j.nuclphysb.2010.02.021

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 »

Actor, A. (1979) Classical solutions of SU(2) Yang—Mills theories. Reviews of Modern Physics, 51(3), 461-525. DOI: 10.1103/RevModPhys.51.461

R. F. Sobreiro, & S. P. Sorella. (2005) Introduction to the Gribov Ambiguities In Euclidean Yang-Mills Theories. arxiv. arXiv: hep-th/0504095v1

Marco Frasca. (2010) Mapping theorem and Green functions in Yang-Mills theory. arxiv. arXiv: 1011.3643v1

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 »

O. Oliveira, P. J. Silva, & P. Bicudo. (2011) What Lattice QCD tell us about the Landau Gauge Infrared Propagators. arxiv. arXiv: 1101.5983v1

FRASCA, M. (2008) Infrared gluon and ghost propagators. Physics Letters B, 670(1), 73-77. DOI: 10.1016/j.physletb.2008.10.022

FRASCA, M. (2009) MAPPING A MASSLESS SCALAR FIELD THEORY ON A YANG–MILLS THEORY: CLASSICAL CASE. Modern Physics Letters A, 24(30), 2425. DOI: 10.1142/S021773230903165X

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