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pro vyhledávání: '"Anselmi, Damiano"'
Autor:
Anselmi, Damiano
We investigate the local limits of various classes of unitary, nonlocal quantum field theories. While it is easy to build nonlocal models with well-behaved asymptotics in Euclidean space, the Minkowskian correlation functions typically exhibit singul
Externí odkaz:
http://arxiv.org/abs/2410.21599
Autor:
Anselmi, Damiano
Publikováno v:
Symmetry 2024, 16(11), 1412
We study the impact of the expansion of the universe on a broad class of objects, including black holes, neutron stars, white dwarfs, and others. Using metrics that incorporate primordial inhomogeneities, the effects of a hypothetical "center of the
Externí odkaz:
http://arxiv.org/abs/2405.12050
Autor:
Anselmi, Damiano
Publikováno v:
Phys. Rev. D 109 (2024) 025003
We study gauge theories and quantum gravity in a finite interval of time $\tau $, on a compact space manifold $\Omega $. The initial, final and boundary conditions are formulated in gauge invariant and general covariant ways by means of purely virtua
Externí odkaz:
http://arxiv.org/abs/2306.07333
Autor:
Anselmi, Damiano
Publikováno v:
J. High Energ. Phys. 07 (2023) 209
We provide a diagrammatic formulation of perturbative quantum field theory in a finite interval of time $\tau $, on a compact space manifold $\Omega $. We explain how to compute the evolution operator $U(t_{\text{f}},t_{\text{i}})$ between the initia
Externí odkaz:
http://arxiv.org/abs/2304.07642
Autor:
Anselmi, Damiano
Publikováno v:
J. High Energ. Phys. 07 (2023) 99
We study the free and dressed propagators of physical and purely virtual particles in a finite interval of time $\tau $ and on a compact space manifold $\Omega $, using coherent states. In the free-field limit, the propagators are described by the en
Externí odkaz:
http://arxiv.org/abs/2304.07643
Autor:
Anselmi, Damiano
Publikováno v:
J. High Energy Phys. 12 (2022) 088
We formulate a new quantization principle for perturbative quantum field theory, based on a minimally non time-ordered product, and show that it gives the theories of physical particles and purely virtual particles. Given a classical Lagrangian, the
Externí odkaz:
http://arxiv.org/abs/2210.14240
Autor:
Anselmi, Damiano
Publikováno v:
Eur. Phys. J. C 83 (2023) 1066
Quantum gravity is extended to include purely virtual "cloud sectors", which allow us to define a complete set of point-dependent observables, including a gauge invariant metric and gauge invariant matter fields, and calculate their off-shell correla
Externí odkaz:
http://arxiv.org/abs/2207.12401
Autor:
Anselmi, Damiano
Publikováno v:
Eur. Phys. J. C 83 (2023) 544
We extend quantum field theory by including purely virtual "cloud" sectors, to define physical off-shell correlation functions of gauge invariant quark and gluon fields, without affecting the $S$ matrix amplitudes. The extension is made of certain cl
Externí odkaz:
http://arxiv.org/abs/2207.11271
Autor:
Anselmi, Damiano
Publikováno v:
Symmetry 2022, 14(3), 521
We review the concept of purely virtual particle and its uses in quantum gravity, primordial cosmology and collider physics. The fake particle, or "fakeon", which mediates interactions without appearing among the incoming and outgoing states, can be
Externí odkaz:
http://arxiv.org/abs/2203.02516
Autor:
Anselmi, Damiano
Publikováno v:
Phys. Rev. D 105 125017 (2022)
We reconsider the Lee-Wick (LW) models and compare their properties to the properties of the models that contain purely virtual particles. We argue against the LW premise that unstable particles can be removed from the sets of incoming and outgoing s
Externí odkaz:
http://arxiv.org/abs/2202.10483