Bach Studies in the Bach Year and others

Bach in Mind

A conserved Bach current

The Bach tensor and a vector which generates conformal symmetries allow a conserved 4-current to be defined. The Bach 4-current gives rise to a quasilocal 2-surface expression for power per luminosity distance in the Vaidya exterior of collapsing fluid interiors. This is interpreted in terms of entropy generation. PACS numbers: 0420J, 0440N

Null Surfaces and the Bach Equations

It is shown that the integrability conditions that arise in the Null Surface Formulation (NSF) of general relativity (GR) impose a field equation on the local null surfaces which is equivalent to the vanishing of the Bach tensor. This field equation is written explicitly to second order in a perturbation expansion. The field equation is further simplified if asymptotic flatness is imposed on th...

Bach the Transcriber : His Organ

ne lesson offered by historical studies of musical styles is that the greatest composers almost never abandon their musical heritage entirely even in their most progressive compositions. They tend to build their works upon existing styles and genres, and then transform them into new styles in ways unprecedented in their times. Josquin des Prez, the “Beethoven of the Renaissance,” has been regar...

François Bach and André Herbelin