3,217 research outputs found

    Phenomenological renormalizaiton group approach to the anisotropic two-layer Ising model

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    The anisotropic two-layer Ising model is studied by the phenomenological renormalizaiton group method. It is found that the anisotropic two-layer Ising model with symmetric couplings belongs to the same universality class as the two dimensional Ising model.Comment: 10 page

    Nonperturbative Thermodynamic Geometry of Anyon Gas

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    Following our earlier work on the Ruppeiner geometry of an anyon gas [B. Mirza and H. Mohammadzadeh, Phys. Rev. E {\bf 78,} 021127 (2008)], we will derive nonperturbative thermodynamic curvature of a two-dimensional ideal anyon gas. At different values of the thermodynamic parameter space, some unique and interesting behaviors of the anyon gas are explored. A complete picture of attractive and repulsive phases of the anyon gas is given.Comment: 20 page

    Thermodynamic Geometry of the Born-Infeld-anti-de Sitter black holes

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    Thermodynamic geometry is applied to the Born-Infeld-anti-de Sitter black hole (BIAdS) in the four dimensions, which is a nonlinear generalization of the Reissner-Norstr\"Aom-AdS black hole (RNAdS). We compute the Weinhold as well as the Ruppeiner scalar curvature and find that the singular points are not the same with the ones obtained using the heat capacity. Legendre-invariant metric proposed by Quevedo and the metric obtained by using the free energy as the thermodynamic potential are obtained and the corresponding scalar curvatures diverge at the Davies points.Comment: Latex,19 pages,14 figure

    Thermodynamic Geometry of Fractional Statistics

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    We extend our earlier study about the fractional exclusion statistics to higher dimensions in full physical range and in the non-relativistic and ultra-relativistic limits. Also, two other fractional statistics, namely Gentile and Polychronakos fractional statistics, will be considered and similarities and differences between these statistics will be explored. Thermodynamic geometry suggests that a two dimensional Haldane fractional exclusion gas is more stable than higher dimensional gases. Also, a complete picture of attractive and repulsive statistical interaction of fractional statistics is given. For a special kind of fractional statistics, by considering the singular points of thermodynamic curvature, we find a condensation for a non-pure bosonic system which is similar to the Bose-Einstein condensation and the phase transition temperature will be worked out.Comment: 29 pages, 12 figure

    Cancellation of soft and collinear divergences in noncommutative QED

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    In this paper, we investigate the behavior of non-commutative IR divergences and will also discuss their cancellation in the physical cross sections. The commutative IR (soft) divergences existing in the non-planar diagrams will be examined in order to prove an all order cancellation of these divergences using the Weinberg's method. In non-commutative QED, collinear divergences due to triple photon splitting vertex, were encountered, which are shown to be canceled out by the non-commutative version of KLN theorem. This guarantees that there is no mixing between the Collinear, soft and non-commutative IR divergences

    Generalized relation between the relative entropy and dissipation for nonequilibrium systems

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    Recently, Kawai, Parrondo, and Van den Broeck have related dissipation to time-reversal asymmetry. We generalized the result by considering a protocol where the physical system is driven away from an initial thermal equilibrium state with temperature β0\beta_0 to a final thermal equilibrium state at a different temperature. We illustrate the result using a model with an exact solution, i.e., a particle in a moving one-dimensional harmonic well.Comment: 4 page

    Service quality models in the context of the fitness industry

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    Purpose This paper aims to reviews the concept of perceived service quality in the fitness industry by considering the service-dominant logic (Vargo and Lusch, 2004) and examining existing service quality models in the context of sport and fitness. Design/methodology/approach The paper critically reviews generic and industry-specific models of service quality in the fitness industry. The examination of the models is intended to identify the role that the perspective of customers and the dynamics of service co-creation play in these models. Findings Consideration of the context in a particular industry plays an important role in the development of service quality models. If underestimated, it can result in a model being inadequate or having limited explanatory potential. The review shows that both generic and fitness industry-specific models have methodological and conceptual limitations. This requires researchers to consider developing new contextual models that acknowledge a) service as co-creation of experience/value between suppliers and customers; and, b) the goal of this co-creation as fulfilment of customers’ aspirations. Such an approach brings a new light to the meaning of ‘a customer’s perspective’ and emphasises the dynamics of service co-creation in the fitness industry. Practical implications The study provides an agenda for future research to consider perceived service quality models from the customers’ perspective. It suggests researchers to take into account various factors of consumer behaviour (e.g. motivation) which are unique to sport and fitness services. Also, managers of fitness facilities need to revisit their tools for capturing customers' perceptions and to update the areas included in customer satisfaction surveys. Originality/value The paper provides an insight into the role of co-creation for service quality in fitness services. It contributes towards establishing revised relations between service quality in fitness and contextual industry-specific factors suggested by numerous studies previously

    Service quality in fitness centres- literature review and further research

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    Addressing the needs of the customers and understanding their perspectives on service quality (SQ) have become essential for fitness organisations in a competitive environment. In a saturated market, fitness clubs seek methods of both retaining existing and attracting new customers. This places a significant emphasis on SQ and the identification of what customers perceive as quality. SQ in the sport and fitness industries evolved into a credible research stream from the late 1980s. However, there is still no agreement in the literature about the key dimensions of quality in these industries. Due to the unique aspects of the sport services, there are distinct differences between sport organisations and other businesses. Recognising this distinction, a number of studies (Brady and Cronin, 2001; Martinez and Martinez, 2010) have emphasised the need for developing industry specific SQ models. The current study aims to review the existing body of literature on SQ in the fitness industry. Future research aims to examine SQ in fitness clubs in England and to test measurement scales from previous studies for their validity. The model of Brady and Cronin (2001) is taken as a basis for the research framework and suggestions for overcoming its existing limitations are proposed
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