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Search Results: 1 - 10 of 223813 matches for " R. Gurau "
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Dimensional regularization and renormalization of non-commutative QFT
R. Gurau,A. Tanasa
Physics , 2007, DOI: 10.1007/s00023-008-0363-y
Abstract: Using the recently introduced parametric representation of non-commutative quantum field theory, we implement here the dimensional regularization and renormalization of the vulcanized $\Phi^{\star 4}_4$ model on the Moyal space.
Tree Quantum Field Theory
R. Gurau,J. Magnen,V. Rivasseau
Physics , 2008, DOI: 10.1007/s00023-009-0002-2
Abstract: We propose a new formalism for quantum field theory which is neither based on functional integrals, nor on Feynman graphs, but on marked trees. This formalism is constructive, i.e. it computes correlation functions through convergent rather than divergent expansions. It applies both to Fermionic and Bosonic theories. It is compatible with the renormalization group, and it allows to define non-perturbatively {\it differential} renormalization group equations. It accommodates any general stable polynomial Lagrangian. It can equally well treat noncommutative models or matrix models such as the Grosse-Wulkenhaar model. Perhaps most importantly it removes the space-time background from its central place in QFT, paving the way for a nonperturbative definition of field theory in noninteger dimension.
The double scaling limit of the multi-orientable tensor model
Razvan Gurau,Adrian Tanasa,Donald R. Youmans
Physics , 2015, DOI: 10.1209/0295-5075/111/21002
Abstract: In this paper we study the double scaling limit of the multi-orientable tensor model. We prove that, contrary to the case of matrix models but similarly to the case of invariant tensor models, the double scaling series are convergent. We resum the double scaling series of the two point function and of the leading singular part of the four point function. We discuss the behavior of the leading singular part of arbitrary correlation functions. We show that the contribution of the four point function and of all the higher point functions are enhanced in the double scaling limit. We finally show that all the correlation functions exhibit a singularity at the same critical value of the double scaling parameter which, combined with the convergence of the double scaling series, suggest the existence of a triple scaling limit.
Non Commutative Field Theory on Rank One Symmetric Spaces
P. Bieliavsky,R. Gurau,V. Rivasseau
Mathematics , 2008,
Abstract: Quantum field theory has been shown recently renormalizable on flat Moyal space and better behaved than on ordinary space-time. Some models at least should be completely finite, even beyond perturbation theory. In this paper a first step is taken to extend such theories to non-flat backgrounds such as solvable symmetric spaces.
Non-Commutative Complete Mellin Representation for Feynman Amplitudes
R. Gurau,A. P. C. Malbouisson,V. Rivasseau,A. Tanasa
Physics , 2007, DOI: 10.1007/s11005-007-0170-2
Abstract: We extend the complete Mellin (CM) representation of Feynman amplitudes to the non-commutative quantum field theories. This representation is a versatile tool. It provides a quick proof of meromorphy of Feynman amplitudes in parameters such as the dimension of space-time. In particular it paves the road for the dimensional renormalization of these theories. This complete Mellin representation also allows the study of asymptotic behavior under rescaling of arbitrary subsets of external invariants of any Feynman amplitude.
A translation-invariant renormalizable non-commutative scalar model
R. Gurau,J. Magnen,V. Rivasseau,A. Tanasa
Physics , 2008, DOI: 10.1007/s00220-008-0658-3
Abstract: In this paper we propose a translation-invariant scalar model on the Moyal space. We prove that this model does not suffer from the UV/IR mixing and we establish its renormalizability to all orders in perturbation theory.
Propagators for Noncommutative Field Theories
R. Gurau,V. Rivasseau,F. Vignes-Tourneret
Mathematics , 2005, DOI: 10.1007/s00023-006-0296-2
Abstract: In this paper we provide exact expressions for propagators of noncommutative Bosonic or Fermionic field theories after adding terms of the Grosse-Wulkenhaar type in order to ensure Langmann-Szabo covariance. We emphasize the new Fermionic case and we give in particular all necessary bounds for the multiscale analysis and renormalization of the noncommutative Gross-Neveu model.
Some Comparative Properties of Reconstituted Poplar Veneer Replicating Wenge With Classic Veneer of the Same Species
Pro Ligno , 2010,
Abstract: Eco-friendly alternative options to traditional wood veneer have become available around the world in reconstituted veneers. This paper is exploring some properties of reconstituted poplar veneer replicating wenge in indirect testing, which meant to evaluate the bending properties of veneered particleboards and in direct testing that envisaged the veneer density and water absorption. The properties of reconstituted poplar replicating wenge were compared with those of poplar and wenge veneer tested in the same conditions. The results show a slightly lower MOE and MOR for the particleboard veneered with reconstituted veneer compared to the classic veneer, in spite of a higher veneered panel density. The reason may be a discontinuous structure of the engineered veneer compared to the traditional veneer. However, the addition of veneer to particleboards has increased their MOE app. 1.4-1.7 times and doubled their MOR. Smaller standard deviation values of the MOE, MOR and density were recorded for the particleboard veneered with reconstituted poplar replicating wenge compared with the ones veneered with poplar or natural wenge, which may indicate a more homogenous structure for the reconstituted veneer compared with the natural veneers. The reconstituted poplar veneer replicating wenge had higher density than the poplar veneer and it absorbed less water. However, compared with natural wenge, the replica made of poplar had lower performances. Further tests could examine the finishing behaviour of reconstituted veneer and its resistance to scratches and spots.
Gurau Calin
Annals of the University of Oradea : Economic Science , 2009,
Abstract: The paper outlines the necessity of marketing flexibility in the context of new theoretical and practical conditions, and proposes a synthetic model of flexible marketing systems capable to enhance the value co-creation process.
Gurau Calin
Annals of the University of Oradea : Economic Science , 2012,
Abstract: Theme: Many reports stress the importance of solving customer complaints in order to maintain customer satisfaction, but also to learn from mistakes and further improve the customer service. However, relatively few empirical studies have been conducted regarding the effect of complains handling activities on customer satisfaction and on company-customer relationships. Objectives of research: This paper attempts to identify the main elements of the complaints handling strategy that are considered essential for customers, and their effect on customer satisfaction. Literature analysis/previous research: Previous studies define a complaint as a conflict between a consumer and a business organisation in which the fairness of the resolution procedures, the interpersonal communication and behaviour, and the outcome of the complaint resolution process are the principal evaluative criteria used by the customer. In our opinion, a complaint is not necessary a conflict, however, it can create a conflict between a customer and a business organisation, when the answer to the consumera€ s complaint is not satisfactory. Therefore, the way in which business organisations deal with consumer complaints can significantly influence the consumersa€ level of satisfaction and loyalty. Research methodology: The empirical analysis of primary data collected through face-to-face interviews with 150 French customers provides a detailed picture of the specific elements of complains handling which are perceived as important in four different settings defined in relation to the perceived importance of the product or service, and the emergency of the experienced problem. Results: The identified elements of the complaint-handling procedure have a variable importance from one element to the other, and in the context of various complaint situations. This finding highlights the fact that, depending on each situation, the factors that will determine customera€ s satisfaction, and that will shape the final perception of the complaint service, will be different. On the other hand, the study presents and discusses the effect of various dimensions of the complaints handling strategy on the customer satisfaction. Implications: The findings of this study indicate the specific elements that should be improved by companies in order to enhance the quality of the complaint-handling process in various transactional situations. Contribution of author/authors: The present paper compares the importance of the various dimensions already identified by researchers in relation to four different situations d
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