What can CQG+ do for you?

Adam Day

Adam Day is the Publisher of Classical and Quantum Gravity and CQG+

Our primary goal with CQG+ is to raise the visibility of some of the best papers in CQG.

Take a look at the table below this post: it shows the 20 most downloaded papers in CQG since the launch of CQG+.  At the time that the data was collected, 15 papers had been promoted by CQG+. 13 of those are to be found in the top 20 (and the other 2 are not far behind).

This leaves no doubt in my mind that CQG+ is achieving its goal – but what does this mean for you? Continue reading

Symmetry operators

Thomas Bäckdahl

Thomas Bäckdahl is a Post-Doctoral Research Assistant in the School of Mathematics at the University of Edinburgh.

Conserved quantities, for example energy and momentum, play a fundamental role in the analysis of dynamics of particles and fields. For field equations, one manifestation of conserved quantities in a broad sense is the existence of symmetry operators, i.e. linear differential operators which take solutions to solutions. A well-known example of a symmetry operator for the scalar wave equation is provided by the Lie derivative along a Killing vector field.

It is important to note that other kinds of objects Continue reading