He is married to the early music violinist Maya Homburger. After spending some years in Ireland, they now live in Switzerland. They run the small label Maya, which releases a variety of records in the genres of free improvisation, baroque music and contemporary composition. Guy's jazz work is characterised by free improvisation, using a range of unusual playing methods: bowed and pizzicato sounds beneath the bass's bridge; plucking the strings above the left hand; beating the strings with percussion instrument mallets; and "preparing" the instrument with sticks and other implements inserted between the strings and fingerboard.
His improvisations are often percussive and unpredictable, inhabiting no discernible harmonic territory and pushing into unknown regions. However, they can also be melodious and tender with due regard for harmonic integration with other players, and at times he will even play with a straight jazz swing feel.
Friday 6 December Saturday 7 December Sunday 8 December Monday 9 December Tuesday 10 December Wednesday 11 December Thursday 12 December Friday 13 December Saturday 14 December Sunday 15 December Monday 16 December Tuesday 17 December Wednesday 18 December Thursday 19 December Friday 20 December Saturday 21 December Sunday 22 December Monday 23 December Tuesday 24 December Wednesday 25 December Thursday 26 December Friday 27 December Saturday 28 December Sunday 29 December Monday 30 December Tuesday 31 December Wednesday 1 January Thursday 2 January Friday 3 January Saturday 4 January Sunday 5 January Monday 6 January Tuesday 7 January Wednesday 8 January Thursday 9 January Friday 10 January Saturday 11 January Sunday 12 January Monday 13 January Tuesday 14 January Wednesday 15 January Thursday 16 January Friday 17 January When the energy-momentum tensor represents an electromagnetic field, a Killing vector field does not necessarily preserve the electric and magnetic fields.
As mentioned at the start of this article, the main application of these symmetries occur in general relativity, where solutions of Einstein's equations may be classified by imposing some certain symmetries on the spacetime. Classifying solutions of the EFE constitutes a large part of general relativity research. Various approaches to classifying spacetimes, including using the Segre classification of the energy-momentum tensor or the Petrov classification of the Weyl tensor have been studied extensively by many researchers, most notably Stephani et al.
They also classify spacetimes using symmetry vector fields especially Killing and homothetic symmetries. For example, Killing vector fields may be used to classify spacetimes, as there is a limit to the number of global, smooth Killing vector fields that a spacetime may possess the maximum being 10 for four-dimensional spacetimes. Generally speaking, the higher the dimension of the algebra of symmetry vector fields on a spacetime, the more symmetry the spacetime admits.
The Einstein static metric has a Killing algebra of dimension 7 the previous 6 plus a time translation. The assumption of a spacetime admitting a certain symmetry vector field can place restrictions on the spacetime. From Wikipedia, the free encyclopedia. For the notation, see Ricci calculus. This article has multiple issues.
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All rights reserved. But to be fair, the data they analyzed came from just 1. HPS collects data in short spurts when the CLAS experiment, which studies protons and neutrons using the same beam line, is not in use. A second part of the analysis is still ongoing: The researchers are also closely inspecting the exact location, or vertex, from which an electron-positron pair emerges. The detector was specifically designed to observe such a signal. Jefferson Lab has approved the HPS project for a total of days of experimental time.
Slowly but surely, HPS scientists are finding chances to use it.
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