79 posts · 46,932 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
79 posts
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- December 12, 2011
- 06:15 AM
- 2,765 views
Yang-Mills scenario: Yet a confirmation
by Marco Frasca in The Gauge Connection
While CERN is calming down rumors (see here), research activity on Yang-Mills theories keeps on going on. A few days ago, a paper by Axel Weber appeared on arxiv (see here). As my readers know, having discussed this at length, in these last years there has been a hot debate between the proponents of the [...]... Read more »
Axel Weber. (2011) Epsilon expansion for infrared Yang-Mills theory in Landau gauge. arXiv. arXiv: 1112.1157v1
Marco Frasca. (2007) Infrared Gluon and Ghost Propagators. Phys.Lett.B670:73-77,2008. arXiv: 0709.2042v6
- February 18, 2011
- 08:43 AM
- 1,205 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 »
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
- March 21, 2011
- 06:48 AM
- 1,112 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
Marco Frasca. (2009) Exact solutions of classical scalar field equations. arxiv. arXiv: 0907.4053v2
- April 20, 2011
- 05:53 PM
- 1,063 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 »
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
- February 21, 2011
- 07:07 AM
- 1,017 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
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
- April 6, 2011
- 03:45 AM
- 995 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 »
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
- April 20, 2011
- 09:28 AM
- 985 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 »
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
- April 8, 2011
- 05:14 AM
- 976 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 »
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
- March 8, 2011
- 05:51 AM
- 951 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 »
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
- June 21, 2011
- 03:47 PM
- 945 views
Evidence of a QCD critical endpoint at RHIC
by Marco Frasca in The Gauge Connection
A critical endpoint in QCD is a kind of holy grail in nuclear physics. It has been theorized as a point where deconfinement occurs and hadronic matter leaves place to some kind of plasma of quarks and gluons. We know that the breaking of chiral symmetry is something that people has proposed several years ago [...]... Read more »
Marco Frasca. (2011) Chiral symmetry in the low-energy limit of QCD at finite temperature. arXiv. arXiv: 1105.5274v2
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
Philippe de Forcrand. (2010) Simulating QCD at finite density. PoS (LAT2009)010, 2009. arXiv: 1005.0539v2
M. A. Stephanov. (2008) Non-Gaussian fluctuations near the QCD critical point. Phys.Rev.Lett.102:032301,2009. arXiv: 0809.3450v1
Christiana Athanasiou, Krishna Rajagopal, & Misha Stephanov. (2010) Using Higher Moments of Fluctuations and their Ratios in the Search for the QCD Critical Point. Physical review D. arXiv: 1006.4636v2
Xiaofeng Luo. (2011) Probing the QCD Critical Point with Higher Moments of Net-proton Multiplicity Distributions. arXiv. arXiv: 1106.2926v1
- March 9, 2011
- 05:32 AM
- 931 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 »
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
- June 1, 2011
- 05:38 AM
- 926 views
CDF bump at 4.8 sigma!
by Marco Frasca in The Gauge Connection
In these days I am exceeding with exclamation marks but let me say that there are sound reasons for this. I will keep on staying on a prudence line as my more renowned colleagues are doing but there is a talk by Giovanni Punzi, the spokesman of CDF Collaboration at Tevatron, (see here), presenting the [...]... Read more »
Kingman Cheung, & Jeonghyeon Song. (2011) Baryonic Z' Explanation for the CDF Wjj Excess. arXiv. arXiv: 1104.1375v3
- April 5, 2011
- 04:16 AM
- 913 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
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
- March 22, 2011
- 07:47 AM
- 894 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 »
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
- March 29, 2011
- 09:00 AM
- 872 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
- May 30, 2011
- 06:09 AM
- 852 views
A critical point in QCD exists indeed!
by Marco Frasca in The Gauge Connection
After my comeback from the conference in Ghent (see here, here and here), I started a collaboration with Marco Ruggieri. Marco was instrumental in making me aware of that part of the community that does computations in QCD at finite temperature. The aim of these people is to get a full landscape of the ground [...]... Read more »
Z. Fodor, & S. D. Katz. (2004) Critical point of QCD at finite T and \mu, lattice results for physical quark masses. JHEP 0404 (2004) 050. arXiv: hep-lat/0402006v1
Marco Frasca. (2011) Chiral symmetry in the low-energy limit of QCD at finite temperature. arXiv. arXiv: 1105.5274v2
T. Hell, S. Roessner, M. Cristoforetti, & W. Weise. (2008) Dynamics and thermodynamics of a nonlocal Polyakov--Nambu--Jona-Lasinio model with running coupling. Phys.Rev.D79:014022,2009. arXiv: 0810.1099v2
D. Gomez Dumm, & N. N. Scoccola. (2004) Characteristics of the chiral phase transition in nonlocal quark models. Phys.Rev. C72 (2005) 014909. arXiv: hep-ph/0410262v2
- March 15, 2011
- 01:27 PM
- 850 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
- August 3, 2011
- 05:54 AM
- 846 views
What’s going on with Higgs particle?
by Marco Frasca in The Gauge Connection
The aftermath of the EPS Conference is quite exciting on a side. Higgs hunting points to an unexpected direction even if some residuals of an old expectation are still there. I just want to show you the graphs of this conference from Tevatron and LHC From these it is very clear that the excluded range [...]... Read more »
Marco Frasca. (2010) Mass generation and supersymmetry. arXiv. arXiv: 1007.5275v2
- August 22, 2011
- 12:17 PM
- 829 views
Higgs particle heavier than ever?
by Marco Frasca in The Gauge Connection
Today in Mumbai (India), at the Lepton-Photon 2011 Conference, talks announcing new results from LHC were held. Data taking claimed almost doubling of data since July Conference in Grenoble. The results were striking and somewhat unexpected. In order to have an idea you should read this CERN press release and the general mood of people [...]... Read more »
Marco Frasca. (2010) Mass generation and supersymmetry. arXiv. arXiv: 1007.5275v2
- March 1, 2011
- 10:59 AM
- 826 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 »
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
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