Asymmetry of the dimension-two gluon condensate: The finite temperature case

Vercauteren, David; Verschelde, Henri

doi:10.1103/physrevd.82.085026

Cited by 17 publications

(22 citation statements)

References 26 publications

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“…This also implies that the electric-magnetic asymmetry observed [431,432] in dimension-two gluon condensates [433] at finite temperature is driven just by the electric sector [249]. Only the soft electric part is then left.…”

Section: Intermediate Momenta and Temperaturesmentioning

confidence: 88%

Gauge bosons at zero and finite temperature

2013

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Gauge theories of the Yang-Mills type are the single most important building block of the standard model of particle physics and beyond. They are an integral part of the strong and weak interactions, and in their Abelian version of electromagnetism. Since Yang-Mills theories are gauge theories their elementary particles, the gauge bosons, cannot be described without fixing a gauge. Therefore, to obtain their properties a quantized and gauge-fixed setting is necessary.Beyond perturbation theory, gauge-fixing in non-Abelian gauge theories is obstructed by the Gribov-Singer ambiguity, which requires the introduction of non-local constraints. The construction and implementation of a method-independent gauge-fixing prescription to resolve this ambiguity is the single most important first step to describe gauge bosons beyond perturbation theory. Proposals for such a procedure, generalizing the perturbative Landau gauge, are described here. Their implementation are discussed for two example methods, lattice gauge theory and the quantum equations of motion.After gauge-fixing, it is possible to study gauge bosons in detail. The most direct access is provided by their correlation functions. The corresponding two-and three-point correlation functions are presented at all energy scales. These give access to the properties of the gauge bosons, like their absence from the asymptotic physical state space, particle-like properties at high energies, and the running coupling. Furthermore, auxiliary degrees of freedom are introduced during gauge-fixing, and their properties are discussed as well. These results are presented for two, three, and four dimensions, and for various gauge algebras.Finally, the modifications of the properties of gauge bosons at finite temperature are presented. Evidence is provided that these reflect the phase structure of Yang-Mills theory. However, it is found that the phase transition is not deconfining the gauge bosons, although the bulk thermodynamical behavior is of a Stefan-Boltzmann type. The resolution of this apparent contradiction is also presented. In addition, this resolution provides an explicit and constructive solution to the Linde problem.Thus, the technical and conceptual framework presented here can be taken as a basis how to determine correlation functions in Yang-Mills theory, therefore opening up the avenue to investigate theories of direct practical relevance. The status of this effort will be briefly described, alongside with connections to other approaches to Yang-Mills theory beyond perturbation theory.

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Section: Intermediate Momenta and Temperaturesmentioning

confidence: 88%

Gauge bosons at zero and finite temperature

2013

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“…A critique that we voluntarily accept. The idea of writing from below was also, and going back to Vercauteren (2011), part of a collective effort of providing the air needed for other experiments to breath. Being committed in social movements, we believe that telling engaging and inspiring experiences to which one can relate is a much-needed practice in reaction to the hegemonic of favoring the plausible over the possible.…”

Section: Concluding Notesmentioning

confidence: 99%

“…Isabelle Stengers (2005, p 998 andcited in Doucet 2011) proposes the concept of the creation of an active memory to document experiences that were promising and turned out to be "failures, deformations or perversions", or on the contrary that made a difference (Vercauteren 2011 And thirdly, our trajectory of reflexivity and learning on the work of scholar activists is about distance. Distance, or rather lack of distance is, what gives rise to probably the most widespread critique on pursuing scholarly work at the service of social struggles.…”

Section: Scholar Activism: Reflexivity and Learningmentioning

confidence: 99%

“…As has been analysed in detail on the basis of critical work with collectives (e.g. see Starhawk 2012, Vercauteren 2011, group building, understanding group dynamics, responding and mediating to individual needs in the group, setting up and changing the pace of the project, finding different ways of engaging members, on the basis of their skills, while balancing the need for novelty and the need for a space of confidence, is crucial. The embeddedness of the researcher in a plethora of activities and projects that preceded EPS, helped with "knowing the other" (Routledge 2004), and in playing out the role of facilitator and activator of group dynamics that constituted the capacity to make an impact.…”

Section: Organic Praxis In Urban Food Growingmentioning

confidence: 99%

“…Within the current neoliberal urban landscape, we consider urban food growing initiatives as liberating experiences which confront us with questions of how to capture and unravel these 'events' to build the knowledge that can push us beyond the known and into experimentation. David Vercauteren (2011) points to the need of creating memories of experience. Such memories make us aware of being part of a history with a past and a future, and according to him, the feeling of 'being preceded' may give people the strength to continue to experiment in ways of doing.…”

Section: Introductionmentioning

confidence: 99%

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Research-informed gardening activism: steering the public food and land agenda

Tornaghi

Dyck

2014

Local Environment

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Drawing on the authors' personal experience in the Edible Public Space project (Leeds, UK), this paper explores the 'spheres of influence' and contradictions that shaped the project's trajectory. We identify and analyse the dynamics and contradictions at play in the formation of an urban gardening group grown out of a coming together of scholarly and committed action ambitions and aim to capture learning elements for scholarly activism, political gardening and radical urbanism. We explore the action research intervention with a focus on the role of spatial interventions in fostering social innovation in the public food and land agenda. We structure our discussion in a threefold conceptual framework: (i) a discussion on shifting planning arenas and their understanding in social innovation; (ii) an overview of the role of political gardening practices, in particular of food commons/food sovereignty initiatives, in envisioning and implementing alternative urbanism; and (iii) a discussion on the action research nexus, through a thick case study description in which we also unpack our own engagement and positionality. Doing so, we aim to contribute to the creation of an active memory of political gardening. The paper will speak in particular to a rising number of researcher-gardeners-environmentalists, and aims to problematise the links between research-informed strategic thinking and actions, and the vocation of critical urban theory to provide and make visible alternatives for social change.

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Dynamical holographic QCD model for glueball and light meson spectra

Huang

2013

J. High Energ. Phys.

134

112

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In this work, we offer a dynamical soft-wall model to describe the gluodynamics and chiral dynamics in one systematical framework. We firstly construct a quenched dynamical holographic QCD (hQCD) model in the graviton-dilaton framework for the pure gluon system, then develop a dynamical hQCD model for the two flavor system in the graviton-dilaton-scalar framework by adding light flavors on the gluodynamical background. For two forms of dilaton background field $\Phi=\mu_G^2z^2$ and $\Phi=\mu_G^2z^2\tanh(\mu_{G^2}^4z^2/\mu_G^2)$, the quadratic correction to dilaton background field at infrared encodes important non-perturbative gluodynamics and naturally induces a deformed warp factor of the metric. By self-consistently solving the deformed metric induced by the dilaton background field, we find that the scalar glueball spectra in the quenched dynamical model is in very well agreement with lattice data. For two flavor system in the graviton-dilaton-scalar framework, the deformed metric is self-consistently solved by considering both the chiral condensate and nonperturbative gluodynamics in the vacuum, which are responsible for the chiral symmetry breaking and linear confinement, respectively. It is found that the mixing between the chiral condensate and gluon condensate is important to produce the correct light flavor meson spectra. The pion form factor and the vector couplings are also investigated in the dynamical hQCD model. Besides, we give the criteria for the existence of linear quark potential from the metric structure, and show a negative quadratic dilaton background field is not favored in the graviton-dilaton framework.Comment: 49 pages, 23 figures, version accepted by JHE

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Asymmetry of the dimension-two gluon condensate: The finite temperature case

Cited by 17 publications

References 26 publications

Gauge bosons at zero and finite temperature

Gauge bosons at zero and finite temperature

Research-informed gardening activism: steering the public food and land agenda

Dynamical holographic QCD model for glueball and light meson spectra

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