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14 papers · 1 filter
Frame dragging anomalies for rotating bodies
Peter Collas, David Klein
Examples of axially symmetric solutions to Einstein's field equations are given that exhibit anomalous "negative frame dragging" in the sense that zero angular momentum test partic…
A simple criterion for nonrotating reference frames
Peter Collas, David Klein
We prove a theorem that gives an easily verifiable necessary and sufficient condition for a reference frame with fixed spacelike coordinates to be nonrotating in the sense of Walke…
Causality violating geodesics in Bonnor's rotating dust metric
Peter Collas, David Klein
We exhibit timelike geodesic paths for a metric, introduced by Bonnor [11] and considered also by Steadman [13], and show that coordinate time runs backward along a portion of thes…
Supersolid Order of Frustrated Hard-Core Bosons in a Triangular Lattice System
H. C. Jiang, M. Q. Weng, Z. Y. Weng +2
We numerically demonstrate that a supersolid phase exists in a frustrated hard-core boson system on a triangular lattice over a wide range of interaction strength. In the infinite…
Timelike Killing Fields and Relativistic Statistical Mechanics
David Klein, Peter Collas
For spacetimes with timelike Killing fields, we introduce a "Fermi-Walker-Killing" coordinate system and use it to prove a Liouville Theorem for an appropriate volume element of ph…
Quantum Hall Effect in Bilayer Graphene: Disorder Effect and Quantum Phase Transition
R. Ma, L. Sheng, R. Shen +2
We numerically study the quantum Hall effect (QHE) in bilayer graphene based on tight-binding model in the presence of disorder. Two distinct QHE regimes are identified in the full…