Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Finn, Kieran"'
For more than half a century, covariant and differential geometric methods have been playing a central role in the development of Quantum Field Theory (QFT). After a brief historic overview of the major scientific achievements using these methods, we
Externí odkaz:
http://arxiv.org/abs/2204.00123
Publikováno v:
Phys. Rev. D 103, 065004 (2021)
The classical Eisenhart lift is a method by which the dynamics of a classical system subject to a potential can be recreated by means of a free system evolving in a higher-dimensional curved manifold, known as the lifted manifold. We extend the formu
Externí odkaz:
http://arxiv.org/abs/2012.15288
Publikováno v:
Eur. Phys. J. C81 (2021) 572
We present a frame- and reparametrisation-invariant formalism for quantum field theories that include fermionic degrees of freedom. We achieve this using methods of field-space covariance and the Vilkovisky-DeWitt (VDW) effective action. We explicitl
Externí odkaz:
http://arxiv.org/abs/2006.05831
Autor:
Finn, Kieran
Publikováno v:
Phys. Rev. D 101, 063512 (2020)
We investigate the initial conditions of inflation in a Bianchi~I universe that is homogeneous but not isotropic. We use the Eisenhart lift to describe such a theory geometrically as geodesics on a field space manifold. We construct the phase-space m
Externí odkaz:
http://arxiv.org/abs/1912.04306
Publikováno v:
Phys. Rev. D 102, 045014 (2020)
We develop a quantum effective action for scalar-tensor theories of gravity which is both spacetime diffeomorphism invariant and field reparameterisation (frame) invariant beyond the classical approximation. We achieve this by extending the Vilkovisk
Externí odkaz:
http://arxiv.org/abs/1910.06661
Autor:
Finn, Kieran, Karamitsos, Sotirios
Publikováno v:
Phys. Rev. D 99, 063515 (2019)
We investigate whether inflation requires finely tuned initial conditions in order to explain the degree of flatness and homogeneity observed in the Universe. We achieve this by using the Eisenhart lift, which can be used to write any scalar field th
Externí odkaz:
http://arxiv.org/abs/1812.07095
Publikováno v:
Phys. Rev. D 98, 016015 (2018)
We present the Eisenhart-lift formalism in which the dynamics of a system that evolves under the influence of a conservative force is equivalent to that of a free system embedded in a curved manifold with one additional generalised coordinate. As an
Externí odkaz:
http://arxiv.org/abs/1806.02431
Publikováno v:
Ann. of Phys. 438, 168767 (2022)
We investigate the idea that the universe before the Big Bang is the $CPT$ reflection of the universe after the bang, both classically and quantum mechanically, so that the universe does {\it not} spontaneously violate $CPT$. We show how $CPT$ symmet
Externí odkaz:
http://arxiv.org/abs/1803.08930
Publikováno v:
Phys. Rev. Lett. 121, 251301 (2018)
We propose that the state of the universe does {\it not} spontaneously violate CPT. Instead, the universe after the big bang is the CPT image of the universe before it, both classically and quantum mechanically. The pre- and post-bang epochs comprise
Externí odkaz:
http://arxiv.org/abs/1803.08928