Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Barca, Gabriele"'
Publikováno v:
Physics of the Dark Universe 45 (2024) 101540
We investigate the quantum dynamics of the isotropic Universe in the presence of a free massless scalar field, playing the role of a physical clock. The Hilbert space is constructed via a direct analogy between the Wheeler-DeWitt equation in the mini
Externí odkaz:
http://arxiv.org/abs/2404.07056
Autor:
Barca, Gabriele, Montani, Giovanni
Publikováno v:
Eur. Phys. J. C 84, 261 (2024)
We study the effects of cut-off physics, in the form of a modified algebra inspired by Polymer Quantum Mechanics and by the Generalized Uncertainty Principle representation, on the collapse of a spherical dust cloud. We analyze both the Newtonian for
Externí odkaz:
http://arxiv.org/abs/2309.09767
Publikováno v:
Phys. Rev. D 108, 063505 (2023)
We provide an Emergent Universe picture in which the fine-tuning on the initial conditions is replaced by cut-off physics, implemented on a semiclassical level when referred to the Universe dynamics and on a purely quantum level for the quantum fluct
Externí odkaz:
http://arxiv.org/abs/2302.01173
We compare two alternative representations of quantum mechanics: Polymer Quantum Mechanics (PQM), which presents features similar to Loop Quantum Gravity and Loop Quantum Cosmology, and the Generalized Uncertainty Principle (GUP) representation, that
Externí odkaz:
http://arxiv.org/abs/2203.05398
Publikováno v:
IJGMMP 19, 07, 2250097 (2022)
We compare in some detail Polymer Quantum Mechanics and the Generalized Uncertainty Principle approach to clarify to what extent we can treat them on the same footing. We show that, while on a semiclassical level they may be formulated as similar mod
Externí odkaz:
http://arxiv.org/abs/2112.08905
Polymer Quantization of the Isotropic Universe: comparison with the Bounce of Loop Quantum Cosmology
We implement Polymer Quantum Mechanics on the Hamiltonian formulation of the isotropic Universe in both the representations of the standard Ashtekar-Barbero-Immirzi connection and of a new generalized coordinate conjugate to the Universe volume. The
Externí odkaz:
http://arxiv.org/abs/2111.02129
Publikováno v:
Universe 2021, 7, 327
We present a review on basic aspects of quantum cosmology in the presence of cut-off physics. We first analyze how the Wheeler-DeWitt equation in a pure metric approach describes the quantum Universe, showing how the singularity is not removed. We th
Externí odkaz:
http://arxiv.org/abs/2109.08645
We analyze the semiclassical and quantum polymer dynamics of the isotropic Universe in terms of both the standard Ashtekar-Barbero-Immirzi connection and its conjugate momentum and also of the new generalized coordinate conjugate to the Universe volu
Externí odkaz:
http://arxiv.org/abs/2006.10614
Publikováno v:
Phys. Rev. D 99, 123509 (2019)
We analyze some relevant semiclassical and quantum features of the implementation of Polymer Quantum Mechanics to the phenomenology of the flat isotropic Universe. We firstly investigate a parallelism between the semiclassical polymer dynamics of the
Externí odkaz:
http://arxiv.org/abs/1902.02128
Autor:
Barca, Gabriele1,2 (AUTHOR) gabriele.barca@uniroma1.it, Montani, Giovanni1,3 (AUTHOR)
Publikováno v:
European Physical Journal C -- Particles & Fields. Mar2024, Vol. 84 Issue 3, p1-14. 14p.
