254 citations · 1k across the 28 of their papers we have counts for
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Traversable Achronal Retrograde Domains In Spacetime
Benjamin K. Tippett, David Tsang
There are many spacetime geometries in general relativity which contain closed timelike curves. A layperson might say that retrograde time travel is possible in such spacetimes. To…
Finite Mirror Effects in Advanced Interferometric Gravitational Wave Detectors
Andrew P. Lundgren, Ruxandra Bondarescu, David Tsang +1
Thermal noise is expected to be the dominant source of noise in the most sensitive frequency band of second generation ground based gravitational wave detectors. Reshaping the beam…
Spin Foam Models of Riemannian Quantum Gravity
John C. Baez, J. Daniel Christensen, Thomas R. Halford +1
Using numerical calculations, we compare three versions of the Barrett-Crane model of 4-dimensional Riemannian quantum gravity. In the version with face and edge amplitudes as desc…