Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-12-03
Commun. Theor. Phys. 57, 629(2012)
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, published version, emphasis on the proper treatment of quadratic divergence in the quantum gravitational computation
Scientific paper
10.1088/0253-6102/57/4/19
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.
Tang Yong
Wu Yue-Liang
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