Zobrazeno 1 - 10
of 96
pro vyhledávání: '"Tim R. Morris"'
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 11, Pp 1-39 (2023)
Abstract We investigate off-shell perturbative renormalisation of pure quantum gravity for both background metric and quantum fluctuations. We show that at each new loop order, the divergences that do not vanish on-shell are constructed from only the
Externí odkaz:
https://doaj.org/article/02bc047a09614d838bda93df287ae672
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 1, Pp 1-30 (2022)
Abstract We study an f(R) approximation to asymptotic safety, using a family of non-adaptive cutoffs, kept general to test for universality. Matching solutions on the four-dimensional sphere and hyperboloid, we prove properties of any such global fix
Externí odkaz:
https://doaj.org/article/ae8ba2646f89407b9290e05b275e0632
Autor:
Alex Mitchell, Tim R. Morris
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 6, Pp 1-41 (2020)
Abstract The Wilsonian renormalization group (RG) properties of the conformal factor of the metric are profoundly altered by the fact that it has a wrong-sign kinetic term. The result is a novel perturbative continuum limit for quantum gravity, which
Externí odkaz:
https://doaj.org/article/975c30c1fd2b47ac8ce4fa905b0a32f2
Autor:
Tim R. Morris
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 8, Pp 1-45 (2018)
Abstract The Wilsonian renormalization group (RG) requires Euclidean signature. The conformal factor of the metric then has a wrong-sign kinetic term, which has a profound effect on its RG properties. Generically for the conformal sector, complete fl
Externí odkaz:
https://doaj.org/article/89dc22eea80745f2820d6763db32e3e7
Autor:
Tim R. Morris
Publikováno v:
SciPost Physics, Vol 5, Iss 4, p 040 (2018)
We show that the Wilsonian renormalization group (RG) provides a natural regularisation of the Quantum Master Equation such that to first order the BRST algebra closes on local functionals spanned by the eigenoperators with constant couplings. We
Externí odkaz:
https://doaj.org/article/c1933c98d4024663b5a3977d6ec59588
Autor:
Vlad-Mihai Mandric, Tim R. Morris
Publikováno v:
Physical Review
We explore the properties of a recently proposed background independent exact renormalization group approach to gauge theories and gravity. In the process we also develop the machinery needed to study it rigorously. The proposal comes with some advan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bce0c5ce2223877c454d40234f5f12c3
http://arxiv.org/abs/2210.00492
http://arxiv.org/abs/2210.00492
Autor:
Tim R. Morris
Publikováno v:
Physical Review
Interactions growing slower than a certain exponential of the square of a scalar field are well behaved when evolved under the functional renormalization group linearized around the Gaussian fixed point. They satisfy properties usually taken for gran
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b768f6959f100e74f12549824bb6de51
http://repo.scoap3.org/api
http://repo.scoap3.org/api
Autor:
Tim R. Morris
Publikováno v:
Physical Review
Recently a novel perturbative continuum limit for quantum gravity has been proposed and demonstrated to work at first order. Every interaction monomial $\sigma$ is dressed with a coefficient function $f^\sigma_\Lambda(\varphi)$ of the conformal facto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba06173b51961c7687afc94aeee84c34
Publikováno v:
Progress of Theoretical and Experimental Physics
We show, explicitly within perturbation theory, that the quantum master equation and the Wilsonian renormalization group flow equation can be combined such that for the continuum effective action, quantum BRST invariance is not broken by the presence
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95bf5a0ca99e9a16b6948f1c6db0033a
http://repo.scoap3.org/api
http://repo.scoap3.org/api
Publikováno v:
Classical and Quantum Gravity. 38:115006
We show that perturbative quantum gravity based on the Einstein-Hilbert action, has a novel continuum limit. The renormalized trajectory emanates from the Gaussian fixed point along (marginally) relevant directions but enters the diffeomorphism invar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e0b8bd32702f1925c2b71db522e3822
https://doi.org/10.1088/1361-6382/abf2f4
https://doi.org/10.1088/1361-6382/abf2f4