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102 papers · 1 filter
Non-unimodular reductions and N = 4 gauged supergravities
P. Marios Petropoulos
We analyze the class of four-dimensional N = 4 supergravities obtained by gauging the axionic shift and axionic rescaling symmetries. These theories are formulated with the machine…
On rime Ansatz
Oleg Ogievetsky, Todor Popov
The ice Ansatz on matrix solutions of the Yang-Baxter equation is weakened to a condition which we call rime. Generic rime solutions of the Yang-Baxter equation are described. We p…
LQG vertex with finite Immirzi parameter
Jonathan Engle, Etera Livine, Roberto Pereira +1
We extend the definition of the "flipped" loop-quantum-gravity vertex to the case of a finite Immirzi parameter. We cover the Euclidean as well as the Lorentzian case. We show that…
Cosmological constant and lensing
Thomas Schucker
The effect of the cosmological constant on the curvature of light due to an isolated spherical mass is recalculated without using the lens equation and compared to a lensing cluste…
Spectral Properties of a Magnetic Quantum Hamiltonian on a Strip
Philippe Briet, Georgi Raikov, Eric Soccorsi
We consider a 2D Schroedinger operator H0 with constant magnetic field, on a strip of finite width. The spectrum of H0 is absolutely continuous, and contains a discrete set of thre…
The theta parameter in loop quantum gravity: effects on quantum geometry and black hole entropy
Danilo Jimenez Rezende, Alejandro Perez
The precise analog of the theta-quantization ambiguity of Yang-Mills theory exists for the real SU(2) connection formulation of general relativity. As in the former case theta labe…