2 citations · 2 across the 5 of their papers we have counts for
5 papers
How Stark units enter SIC overlaps
Ingemar Bengtsson, Gary McConnell
It has been observed that the mutual scalar products of the vectors in a SIC-POVM are given by algebraic units, and at least in some cases by square roots of Stark units. The full…
A Conjecture on Almost Flat SIC-POVMs
Ingemar Bengtsson, Markus Grassl
A well supported conjecture states that SIC-POVMs -- maximal sets of complex equiangular lines -- with anti-unitary symmetry give rise to an identity expressing some of its overlap…
Ultra-massive spacetimes in 2+1 dimensions with positive Λ
Ingemar Bengtsson, José M M Senovilla
We show that ultra-massive spacetimes exist also in 2 + 1 dimensions with a positive cosmological constant Λ > 0. They can be created through the collapse of a spherical null dust…
Evolutionary constraints: Gluing in a toy model
Ingemar Bengtsson, Istvan Racz
It is possible to solve the Einstein constraint equations as an evolutionary rather than an elliptic system. Here we consider the Gauss constraint in electrodynamics as a toy model…
SIC-POVMs from Stark Units: Dimensions n^2+3=4p, p prime
Ingemar Bengtsson, Markus Grassl, Gary McConnell
The existence problem for maximal sets of equiangular lines (or SICs) in complex Hilbert space of dimension remains largely open. In a previous publication (arXiv:2112.05552) w…