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Pure connection gravity at one loop: Instanton background

Autor: Groh, Kai, Krasnov, Kirill, Steinwachs, Christian F.

In the "pure connection" formulation General Relativity becomes a particular diffeomorphism invariant SL(2) gauge theory. Using this formalism, we compute the divergent contributions to the gravitational one-loop effective action. Calculations of the

Externí odkaz: http://arxiv.org/abs/1304.6946

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Duality and Couplings of 3-Form-Multiplets in N=1 Supersymmetry

Autor: Groh, Kai, Louis, Jan, Sommerfeld, Jason

In this paper we study 3-form gauge fields in four-dimensional N=1 supersymmetric theories. We give the sigma model action together with its Poincare dual action for massless and massive 3-forms. The resulting target space geometries are Kahler where

Externí odkaz: http://arxiv.org/abs/1212.4639

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Off-diagonal heat-kernel expansion and its application to fields with differential constraints

Autor: Groh, Kai, Saueressig, Frank, Zanusso, Omar

The off-diagonal heat-kernel expansion of a Laplace operator including a general gauge-connection is computed on a compact manifold without boundary up to third order in the curvatures. These results are used to study the early-time expansion of the

Externí odkaz: http://arxiv.org/abs/1112.4856

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The Universal RG Machine

Autor: Benedetti, Dario, Groh, Kai, Machado, Pedro F., Saueressig, Frank

Publikováno v: JHEP 1106 (2011) 079

Functional Renormalization Group Equations constitute a powerful tool to encode the perturbative and non-perturbative properties of a physical system. We present an algorithm to systematically compute the expansion of such flow equations in a given b

Externí odkaz: http://arxiv.org/abs/1012.3081

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Ghost wave-function renormalization in Asymptotically Safe Quantum Gravity

Autor: Groh, Kai, Saueressig, Frank

Publikováno v: J.Phys.A43:365403,2010

Motivated by Weinberg's asymptotic safety scenario, we investigate the gravitational renormalization group flow in the Einstein-Hilbert truncation supplemented by the wave-function renormalization of the ghost fields. The latter induces non-trivial c

Externí odkaz: http://arxiv.org/abs/1001.5032

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