Zobrazeno 1 - 10
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pro vyhledávání: '"C. Wetterich"'
Autor:
C. Wetterich
Publikováno v:
Nuclear Physics B, Vol 1008, Iss , Pp 116707- (2024)
Field transformations for the quantum effective action lead to different pictures of a given physical situation, as describing a given evolution of the universe by different geometries. Field transformations for functional flow equations can reveal i
Externí odkaz:
https://doaj.org/article/84532a71bf7a4979bb7867da7a0872ab
Autor:
C. Wetterich
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 6, Pp 1-58 (2022)
Abstract In pregeometry a metric arises as a composite object at large distances. We investigate if its signature, which distinguishes between time and space, could be a result of the dynamics rather than being built in already in the formulation of
Externí odkaz:
https://doaj.org/article/48241b36150046b88772d1a3c5cf6403
Autor:
C. Wetterich
Publikováno v:
Nuclear Physics B, Vol 985, Iss , Pp 116017- (2022)
Quantum gravity can determine the dependence of gauge couplings in a scalar field, which is related to possible fifth forces and time varying fundamental “constants”. This prediction is based on the scaling solution of functional flow equations.
Externí odkaz:
https://doaj.org/article/f70d894180894741a3e33d563f0fc016
Autor:
C. Wetterich
Publikováno v:
Physics Letters B, Vol 818, Iss , Pp 136355- (2021)
The great emptiness is a possible beginning of the Universe in the infinite past of physical time. For the epoch of great emptiness particles are extremely rare and effectively massless. Only expectation values of fields and average fluctuations char
Externí odkaz:
https://doaj.org/article/e5c404e07190430b829146bcaae7d595
Autor:
C. Wetterich
Publikováno v:
Nuclear Physics B, Vol 964, Iss , Pp 115326- (2021)
We propose fundamental scale invariance as a new theoretical principle beyond renormalizability. Quantum field theories with fundamental scale invariance admit a scale-free formulation of the functional integral and effective action in terms of scale
Externí odkaz:
https://doaj.org/article/bcae763fb051454a8c1ed99674e82f8e
Autor:
C. Wetterich
Publikováno v:
Nuclear Physics B, Vol 963, Iss , Pp 115296- (2021)
A classical local cellular automaton can describe an interacting quantum field theory for fermions. We construct a simple classical automaton for a particular version of the Thirring model with imaginary coupling. This interacting fermionic quantum f
Externí odkaz:
https://doaj.org/article/29cd046e87f042ec98a87547d7823100
Autor:
C. Wetterich
Publikováno v:
Nuclear Physics B, Vol 934, Iss , Pp 265-316 (2018)
We discuss the concept of gauge-invariant fields for non-abelian gauge theories. Infinitesimal fluctuations around a given gauge field can be split into physical and gauge fluctuations. Starting from some reference field the gauge-invariant fields ar
Externí odkaz:
https://doaj.org/article/ea98b51b63a54006b52c198920ddd6ac
Autor:
C. Wetterich
Publikováno v:
Nuclear Physics B, Vol 931, Iss C, Pp 262-282 (2018)
We propose a closed gauge-invariant functional flow equation for Yang–Mills theories and quantum gravity that only involves one macroscopic gauge field or metric. It is based on a projection on physical and gauge fluctuations. Deriving this equatio
Externí odkaz:
https://doaj.org/article/48261cc2a01d4daa84910f26e0b2bc23
Autor:
C. Wetterich
Publikováno v:
Nuclear Physics B, Vol 927, Iss , Pp 35-96 (2018)
For “static memory materials” the bulk properties depend on boundary conditions. Such materials can be realized by classical statistical systems which admit no unique equilibrium state. We describe the propagation of information from the boundary
Externí odkaz:
https://doaj.org/article/d883d86056ce40ee9ff38b2167db8daa
Autor:
C. Wetterich
Publikováno v:
Physics Letters B, Vol 773, Iss , Pp 6-19 (2017)
Graviton fluctuations induce strong non-perturbative infrared renormalization effects for the cosmological constant. The functional renormalization flow drives a positive cosmological constant towards zero, solving the cosmological constant problem w
Externí odkaz:
https://doaj.org/article/e269a2671e6f496291b51e531e57f1b2