1108.5486 (David A. Nichols et al.)

Visualizing Spacetime Curvature via Frame-Drag Vortexes and Tidal
Tendexes I. General Theory and Weak-Gravity Applications
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David A. Nichols, Robert Owen, Fan Zhang, Aaron Zimmerman, Jeandrew Brink, Yanbei Chen, Jeffrey D. Kaplan, Geoffrey Lovelace, Keith D. Matthews, Mark A. Scheel, Kip S. Thorne