Quantum Gravitational Contributions to Gauge Field Theories |
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Authors: | TANG Yong WU Yue-Liang |
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Institution: | Kavli Institute for Theoretical Physics China(KITPC), State Key Laboratory of Theoretical Physics(SKLTP), Institute of Theoretical Physics, Chinese Academy of Science, Beijing 100190, China |
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Abstract: | We revisit quantum gravitational contributions to quantum gauge field theories in the gauge condition independent Vilkovisky-DeWitt formalism based on the background field method.With the advantage of Landau-DeWitt gauge,we explicitly obtain the gauge condition independent result for the quadratically divergent gravitational corrections to gauge couplings.By employing,in a general way,a scheme-independent regularization method that can preserve both gauge invariance and original divergent behavior of integrals,we show that the resulting gauge coupling is power-law running and asymptotically free.The regularization scheme dependence is clarified by comparing with results obtained by other methods.The loop regularization scheme is found to be applicable for a consistent calculation. |
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Keywords: | quantum gravity Vilkovisky-DeWitt asymptotic freedom |
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