Gravity news:

Classical and Quantum Aspects of 1 + 1 Gravity

We present a classification of all global solutions (with Lorentzian signature) for any general 2D dilaton gravity model. For generic choices of potential-like terms in the Lagrangian one obtains maximally extended solutions on arbitrary non-compact two-manifolds, including various black-hole and kink configurations. We determine all physical quantum states in a Dirac approach. In some cases th...

Gravity news:

Matters of Gravity Gravity News: Report from the Aps Topical Group Editor

Research briefs: LIGO Project Status, Stan Whitcomb : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 6 General Relativity Survives another Test, Cli Will : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 8 Macroscopic deviations from Hawking radiation?, Lee Smolin : : : : : : : : : : : : : : : : : : : : : : : 10 Toroidal Event Hor...

Editorial policy : The newsletter

News: Topical group news, by Jim Isenberg . . . . . . . . . . . . . . . . . . . . . . . . 4 We hear that..., by Jorge Pullin . . . . . . . . . . . . . . . . . . . . . . . . . . 6 The Chandra Satellite, by Beverly Berger . . . . . . . . . . . . . . . . . . . . . 7 Research Briefs: Analytical event horizons of merging black holes, by Simonetta Frittelli . . . . . . 8 LIGO project update, by David...

How Much Gravity Is Needed to Establish the Perceptual Upright?

Might the gravity levels found on other planets and on the moon be sufficient to provide an adequate perception of upright for astronauts? Can the amount of gravity required be predicted from the physiological threshold for linear acceleration? The perception of upright is determined not only by gravity but also visual information when available and assumptions about the orientation of the body...