7 citations · 21 across the 12 of their papers we have counts for
12 papers
GraviGUT unification with revisited Pati-Salam model
Stephon Alexander, Bruno Alexandre, Michael Fine +2
We propose a graviGUT unification scheme based on the simple orthogonal group that resolves the chiral duplication of weak isospin in Pati--Salam mod…
Spontaneous Symmetry Breaking in Graviweak Theory
Stephon Alexander, Bruno Alexandre, Michael Fine +2
Graviweak theory seeks to unify gravity (specifically in its self-dual formulation) with the weak interaction, preying on their parallel chiral structures. In this paper we…
Unimodular JT gravity and de Sitter quantum cosmology
Bruno Alexandre, Altay Etkin, Farbod-Sayyed Rassouli
In this work, we show that a gauge-theoretic description of Jackiw-Teitelboim (JT) gravity naturally yields a Henneaux-Teitelboim (HT) unimodular gravity via a central extension of…
Higgs Mechanism for the Ashtekar Self-Dual Connection
Bruno Alexandre
We introduce the Higgs mechanism for the self-dual spin connection (also known as the Ashtekar connection), using the Plebański formulation of gravity. We develop our formalism wit…
Overall signature of the metric and the cosmological constant
Bruno Alexandre, Steffen Gielen, João Magueijo
We consider a little known aspect of signature change, where the overall sign of the metric is allowed to change, with physical implications. We show how, in different formulations…
Unitary and Vilenkin's wave functions
Bruno Alexandre, Raymond Isichei, João Magueijo
It is remarkably difficult to reconcile unitary and Vilenkin's wave function. For example, the natural conserved inner product found in quantum unimodular gravity applies to the Ha…
Quantum Gravity Signatures in the Late-Universe
Michael W. Toomey, Savvas Koushiappas, Bruno Alexandre +1
We calculate deviations in cosmological observables as a function of parameters in a class of connection-based models of quantum gravity. In this theory non-trivial modifications t…
Unimodular Hartle-Hawking wave packets and their probability interpretation
Bruno Alexandre, João Magueijo
We re-examine the Hartle-Hawking wave function from the point of view of a quantum theory which starts from the connection representation and allows for off-shell non-constancy of…
Possible quantum effects at the transition from cosmological deceleration to acceleration
Bruno Alexandre, Joao Magueijo
The recent transition from decelerated to accelerated expansion can be seen as a reflection (or "bounce") in the connection variable, defined by the inverse comoving Hubble length…
Topic Analysis of Superconductivity Literature by Semantic Non-negative Matrix Factorization
Valentin Stanev, Erik Skau, Ichiro Takeuchi +1
We utilize a recently developed topic modeling method called SeNMFk, extending the standard Non-negative Matrix Factorization (NMF) methods by incorporating the semantic structure…
Fresnel polarisation of infra-red radiation by elemental bismuth
Bruno S. C. Alexandre, Luís C. Martins, Jaime E. Santos +2
We revisit the classical problem of electromagnetic wave refraction from a lossless dielectric to a lossy conductor, where both media are considered to be non-magnetic, linear, iso…
Excitation of SPP's in graphene by a waveguide mode
D. C. Pedrelli, B. S. C. Alexandre, N. M. R. Peres
We present a semi-analytical model that predicts the excitation of surface-plasmon polaritons (SPP) on a graphene sheet located in front of a sub-wavelength slit drilled in thick m…