Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Benjamin Knorr"'
Autor:
Benjamin Knorr
Publikováno v:
Physics Letters B, Vol 792, Iss , Pp 142-148 (2019)
We set up a covariant renormalisation group equation on a foliated spacetime which preserves background diffeomorphism symmetry. As a first application of the new formalism, we study the effect of quantum fluctuations in Lorentz symmetry breaking the
Externí odkaz:
https://doaj.org/article/f29c5ac9f4c94969b550b4e34ff71274
Autor:
Benjamin Knorr
Publikováno v:
SciPost Physics Core, Vol 4, Iss 3, p 020 (2021)
We present a general framework to systematically study the derivative expansion of asymptotically safe quantum gravity. It is based on an exact decoupling and cancellation of different modes in the Landau limit, and implements a correct mode count
Externí odkaz:
https://doaj.org/article/57efb498cb5d4887a47ef487b0a7d1c7
Autor:
Benjamin Knorr, Marc Schiffer
Publikováno v:
Universe, Vol 7, Iss 7, p 216 (2021)
We employ non-perturbative renormalisation group methods to compute the full momentum dependence of propagators in quantum gravity in general dimensions. We disentangle all different graviton and Faddeev–Popov ghost modes and find qualitative diffe
Externí odkaz:
https://doaj.org/article/212846cac93f4727870de7e5e2992e0e
Publikováno v:
Physical Review
We discuss some aspects of the metric configuration space in quantum gravity in the background field formalism. We give a necessary and sufficient condition for the parameterization of Euclidean metric fluctuations such that i) the signature of the m
Publikováno v:
Physical Review
We tackle the question of whether regular black holes or other alternatives to the Schwarzschild solution can arise from an action principle in quantum gravity. Focusing on an asymptotic expansion of such solutions and inspecting the corresponding fi
Autor:
Benjamin Knorr
Publikováno v:
Physical Review Letters
We present the complete set of universal one-loop beta functions of cubic gravity in six dimensions. The system admits over 8000 distinct fixed points, of which more than 200 are real. Some of them might be relevant for the quantization of gravity in
Publikováno v:
Journal of High Energy Physics, 2020, 11, pp. 1-31
Journal of High Energy Physics
Journal of High Energy Physics, 2020, 1-31
Journal of High Energy Physics
Journal of High Energy Physics, 2020, 1-31
We employ the curvature expansion of the quantum effective action for gravity-matter systems to construct graviton-mediated scattering amplitudes for non-minimally coupled scalar fields in a Minkowski background. By design, the formalism parameterise
Publikováno v:
Physical Review Letters
Physical Review Letters, 125, 18, pp. 1-6
Physical Review Letters, 125, 1-6
Physical Review Letters, 125, 18, pp. 1-6
Physical Review Letters, 125, 1-6
We study the gravity-mediated scattering of scalar fields based on a parameterisation of the Lorentzian quantum effective action. We demonstrate that the interplay of infinite towers of spin zero and spin two poles at imaginary squared momentum leads
Autor:
Marc Schiffer, Benjamin Knorr
Publikováno v:
Universe, Vol 7, Iss 216, p 216 (2021)
Universe
Volume 7
Issue 7
Universe
Volume 7
Issue 7
We employ non-perturbative renormalisation group methods to compute the full momentum dependence of propagators in quantum gravity in general dimensions. We disentangle all different graviton and Faddeev-Popov ghost modes and find qualitative differe
Autor:
Benjamin Knorr, Chris Ripken
Publikováno v:
Physical Review
Affine gravity is a connection-based formulation of gravity that does not involve a metric. After a review of basic properties of affine gravity, we compute the tree-level scattering amplitude of scalar particles interacting gravitationally via the c