Zobrazeno 1 - 10
of 149
pro vyhledávání: '"Trugenberger, Carlo"'
Publikováno v:
Materials 17, 4924 (2024)
Bose metals are metals made of Cooper pairs, which form at very low temperatures in superconducting films and Josephson junction arrays as an intermediate phase between superconductivity and superinsulation. We predicted the existence of this 2D meta
Externí odkaz:
http://arxiv.org/abs/2410.06659
Autor:
Trugenberger, Carlo A.
Publikováno v:
Class. Quant. Gravity (2024)
We point out that dark matter and dark energy arise naturally in a recently proposed model of combinatorial quantum gravity. Dark energy is due to the ground-state curvature at finite coupling, dark matter arises from allotropy in the discrete struct
Externí odkaz:
http://arxiv.org/abs/2409.09385
Autor:
Trugenberger, Carlo A.
Publikováno v:
Condens. Matter 9, 34 (2024)
We review the theoretical model underpinning the recently reported room-temperature, ambient-pressure superconductivity along line defects on the surface of highly-oriented pyrolytic graphite. The main ingredients for this 1D room-temperature superco
Externí odkaz:
http://arxiv.org/abs/2409.05031
Autor:
Trugenberger, Carlo A.
Publikováno v:
Condensed Matter 8, 85 (2023)
We review the topological gauge theory of Josephson junction arrays and thin film superconductors, stressing the role of the usually forgotten quantum phase slips, and we derive their quantum phase structure. A quantum phase transition from a superco
Externí odkaz:
http://arxiv.org/abs/2309.11098
Autor:
Trugenberger, Carlo A.
Publikováno v:
JHEP 03, 186 (2023)
De Sitter space-time, essentially our own universe, is plagued by problems at the quantum level. Here we propose that Lorentzian de Sitter space-time is not fundamental but constitutes only an effective description of a more fundamental quantum gravi
Externí odkaz:
http://arxiv.org/abs/2211.01002
Autor:
Trugenberger, Carlo A.
We show that the oblique confinement states in the Cardy-Rabinovici model are superinsulators, not topological insulators. This is because their only bulk excitations are strings that completely prevent the separation of charge-anticharge pairs, caus
Externí odkaz:
http://arxiv.org/abs/2206.12823
Autor:
Trugenberger, Carlo A.
Publikováno v:
JHEP 04 (2022) 019
Combinatorial quantum gravity is governed by a discrete Einstein-Hilbert action formulated on an ensemble of random graphs. There is strong evidence for a second-order quantum phase transition separating a random phase at strong coupling from an orde
Externí odkaz:
http://arxiv.org/abs/2112.03778
We present a new regularisation of Euclidean Einstein gravity in terms of (sequences of) graphs. In particular, we define a discrete Einstein-Hilbert action that converges to its manifold counterpart on sufficiently dense random geometric graphs (mor
Externí odkaz:
http://arxiv.org/abs/2102.02356
Publikováno v:
Discrete & Computational Geometry, v.70(3), p.671-712 , 2023
Curvature is a fundamental geometric characteristic of smooth spaces. In recent years different notions of curvature have been developed for combinatorial discrete objects such as graphs. However, the connections between such discrete notions of curv
Externí odkaz:
http://arxiv.org/abs/2009.04306
We consider a formal discretisation of Euclidean quantum gravity defined by a statistical model of random $3$-regular graphs and making using of the Ollivier curvature, a coarse analogue of the Ricci curvature. Numerical analysis shows that the Hausd
Externí odkaz:
http://arxiv.org/abs/2008.11779