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Minimally subtracted six loop renormalization of $O(n)$-symmetric $φ^4$ theory and critical exponents (1705.06483v2)

Published 18 May 2017 in hep-th, cond-mat.stat-mech, and hep-lat

Abstract: We present the perturbative renormalization group functions of $O(n)$-symmetric $\phi4$ theory in $4-2\varepsilon$ dimensions to the sixth loop order in the minimal subtraction scheme. In addition, we estimate diagrams without subdivergences up to 11 loops and compare these results with the asymptotic behaviour of the beta function. Furthermore, we perform a resummation to obtain estimates for critical exponents in three and two dimensions.

Citations (162)

Summary

Overview of Six-Loop Renormalization in O(n)-Symmetric φ Theory

The paper focuses on the advanced perturbative computations of renormalization group functions for the O(n)-symmetric φ theory in 4 - 2ε dimensions, extending the calculations up to six loops. This advancement marks a significant step forward in the precision of determining critical exponents of phase transitions within O(n) universality classes in both three and two dimensions. After being restricted to five-loop calculations for over two decades, the authors achieve six-loop results by utilizing newly developed techniques that automate the computation of Feynman integrals.

Renormalization Group Functions and Critical Exponents

By employing the minimal subtraction (MS) scheme in dimensional regularization, the authors present an exhaustive set of renormalization group functions for arbitrary values n. Their methodology involves a rigorous analysis and computation of diagrams up to six loops, supplemented by estimates for additional diagrams reaching up to eleven loops. This work enabled them to perform a resummation of these series to refine estimates for critical exponents, a key component in understanding phase transitions.

Numerical Results and Confirmations

The paper provides detailed numerical expansions for the RG functions and critical exponents, which are validated against past predictions. Notably, the paper confirms the results for the anomalous dimension of the field and the beta function at six loops with previous large n expansions and numerical computations. This consolidation of results through various high-order expansions ensures the credibility and stability of the presented findings.

Asymptotic Behavior and Resummation Techniques

The authors delve into the asymptotic behavior of the series coefficients, acknowledging the slow convergence towards asymptotic predictions. They investigate the primitive contributions to the beta function, revealing an evolving dominance with increasing loop orders. For resummation, they employ a sophisticated Borel resummation technique with conformal mapping. This methodology, enhanced with the freedom to adjust specific parameters, facilitates accurate estimates for critical exponents in three dimensions.

Implications and Future Directions

The implications of this research span both theoretical and practical domains. The precise estimates for critical exponents could lead to enhanced theoretical models for simulated systems exhibiting such phase transitions. From a theoretical standpoint, these advancements challenge and refine existing methods and assumptions in quantum field theory and critical phenomena analysis. The authors anticipate that forthcoming seven-loop calculations will further reduce uncertainties and bolster the compatibility tests of differing theoretical approaches. Additionally, they propose the potential application of these methodologies across a broader spectrum of universality classes and more complex interactions.

Conclusion

In summary, the paper exemplifies a substantial leap in calculating renormalization group functions for O(n)-symmetric φ theory, presenting a detailed framework and precise results that may guide future developments in the field. By embracing novel techniques and verifying results through multiple independent methods, the authors set a new benchmark in the perturbative analysis of critical phenomena. This work paves the way for imminent advancements and serves as a foundation for the deeper exploration of universality and phase transition dynamics in statistical physics.