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Science 9 October 1998:
Vol. 282. no. 5387, p. 249
DOI: 10.1126/science.282.5387.249
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Perspectives

Also see the archival list of Science's Compass: Enhanced Perspectives

GENERAL RELATIVITY:
Enhanced: A New Twist

Matt Visser

Mass, energy, and momentum are fundamental concepts in Newtonian physics. In Einstein's theory of general relativity, however, spacetime is itself a dynamic object, so how does one choose the fundamental quantities? In his Perspective, Visser discusses a new approach to defining one such quantity--angular momentum--recently published by Rizzi in Physical Review Letters.

The author is in the Physics Department, Washington University, St. Louis, MO 63130-4899, USA. E-mail: visser{at}kiwi.wustl.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)