منابع مشابه
Gravitational correction to running of gauge couplings.
We calculate the contribution of graviton exchange to the running of gauge couplings at lowest non-trivial order in perturbation theory. Including this contribution in a theory that features coupling constant unification does not upset this unification, but rather shifts the unification scale. When extrapolated formally, the gravitational correction renders all gauge couplings asymptotically free.
متن کاملGauge dependence of gravitational correction to running of gauge couplings.
Recently an interesting idea has been put forward by Robinson and Wilczek that the incorporation of quantized gravity in the framework of Abelian and non-Abelian gauge theories results in a correction to the running of gauge coupling and, as a consequence, increase the grand unification scale and asymptotic freedom. In this Letter it is shown by explicit calculations that this correction depend...
متن کاملRunning Surface Couplings
We discuss the renormalization group improved effective action and running surface couplings in curved spacetime with boundary. Using scalar selfinteracting theory as an example, we study the influence of boundary effects to effective equations of motion in spherical cap and the relevance of surface running couplings to quantum cosmology and symmetry breaking phenomenon. Running surface couplin...
متن کاملGravitational Couplings for Ygop-planes
The results that this paper presents is about gravitational couplings for y deformed and generalized orientifold planes (yGOp-planes) . The usual orientifold planes do not have gauge fields on their worldvolumes and do no have any kind of topological y-deformation over their worldvolumes . The y deformed and generalized orientifold planes that this paper consider have SO(2k) Yang-Mills gauge fi...
متن کاملGravitational couplings of orientifold planes
We reanalyse the gravitational couplings of the perturbative orientifold planes Op, Op (and D-branes). We first compute their D−1 instantonic corrections for p = 3. Then, by using U-dualities, we obtain the Wess-Zumino terms of orientifolds with RR flux for p ≤ 5. The expressions for the effective actions can be partially checked via M-theory. We point out a previous oversimplification and we s...
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 1998
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/15/11/011