Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Lesław Rachwał"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 9, Pp 1-48 (2024)
Abstract The six-derivative conformal scalar operator was originally found by Hamada in its critical dimension of spacetime, $$d=6$$ d = 6 . We generalize this construction to arbitrary dimensions d by adding new terms cubic in gravitational curvatur
Externí odkaz:
https://doaj.org/article/10eb3c4fc84b43dca2e2563672a7ceaa
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 9, Pp 1-20 (2024)
Abstract We study how the number of degrees of freedom in Weyl conformal gravity runs with the energy scale from the UV fixed point. To this end we employ two approaches. First, we utilize the Fradkin–Tseytlin prescription for the number of degrees
Externí odkaz:
https://doaj.org/article/3acdf3de405c4782af91401fbfd2f1b6
Autor:
Gianluca Calcagni, Breno L. Giacchini, Leonardo Modesto, Tibério de Paula Netto, Lesław Rachwał
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 9, Pp 1-52 (2023)
Abstract We extensively study the ultraviolet quantum properties of a nonlocal action for gravity nonminimally coupled to matter. The theory unifies matter and gravity in an action principle such that all the classical solutions of Einstein’s theor
Externí odkaz:
https://doaj.org/article/f58df2b1c574499fb1a548bdd1668224
Autor:
Lesław Rachwał
Publikováno v:
Acta Polytechnica, Vol 62, Iss 1, Pp 118-156 (2022)
We extensively motivate the studies of higher-derivative gravities, and in particular we emphasize which new quantum features theories with six derivatives in their definitions possess. Next, we discuss the mathematical structure of the exact on the
Externí odkaz:
https://doaj.org/article/d8574b53d7e9475eb30c208c09e1adac
Autor:
Nobuyoshi Ohta, Lesław Rachwał
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 9, Pp 1-31 (2020)
Abstract We study the quantum gravitational system coupled to a charged scalar, Dirac fermions, and electromagnetic fields. We use the “exact” or “functional” renormalization group equation to derive the effective action $$\Gamma _0$$ Γ 0 by
Externí odkaz:
https://doaj.org/article/339744d411474af9acfb1126fd83f979
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 3, Pp 1-23 (2020)
Abstract We study the spectral action approach to higher derivative gravity. The work focuses on the classical aspects. We derive the complete and simplified form of the purely gravitational action up to the 6-derivative terms. We also derive the equ
Externí odkaz:
https://doaj.org/article/7d4921667bf0411d8723826f921663a5
Autor:
Lesław Rachwał
Publikováno v:
Universe, Vol 8, Iss 4, p 229 (2022)
We present and discuss well known conditions for ultraviolet finiteness and asymptotic safety. The requirements for complete absence of ultraviolet divergences in quantum field theories and existence of a non-trivial fixed point for renormalization g
Externí odkaz:
https://doaj.org/article/7f952b3cfa2b44169475fcf73d757493
Autor:
Lesław Rachwał
Publikováno v:
Universe, Vol 8, Iss 4, p 225 (2022)
A method for consistent quantization of conformal gravity treating conformal symmetry in a very controllable way is presented. First, we discuss local conformal symmetry in the framework of gravitational interactions, where we view it as an example o
Externí odkaz:
https://doaj.org/article/0b25e9b3ad85447fa9b05498e4f445a4
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 7, Pp 1-19 (2018)
Abstract One of the main advantages of super-renormalizable higher derivative quantum gravity models is the possibility to derive exact beta functions, by making perturbative one-loop calculations. We perform such a calculation for the Newton constan
Externí odkaz:
https://doaj.org/article/17edd83dc0de4c9fbd04d0c39723647f
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 6, Pp 1-14 (2018)
Abstract We compute the area term contribution to black holes’ entanglement entropy (using the conical technique) for a class of local or weakly non-local super-renormalizable gravitational theories coupled to matter. For the first time, we explici
Externí odkaz:
https://doaj.org/article/6013056364054e3aacea2fa0d4a1d66f