1.9k citations
- Tyndall National InstituteIE88 papers
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- Okinawa Institute of Science and Technology Graduate UniversityJP46 papers
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- Queen's University BelfastGB35 papers
- Center for Astrophysics Harvard & SmithsonianUS34 papers
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25 papers · 1 filter
On the time complexity of 2-tag systems and small universal Turing machines
Damien Woods, Turlough Neary
We show that 2-tag systems efficiently simulate Turing machines. As a corollary we find that the small universal Turing machines of Rogozhin, Minsky and others simulate Turing mach…
Passive Optical Network Approach to GigaHertz-Clocked Multiuser Quantum Key Distribution
Veronica Fernandez, Robert J. Collins, Karen J. Gordon +2
We present the application of quantum key distribution technologies to fiber-based broadband passive optical access networks. This application is based on our 850 nm wavelength gig…
Homogeneous hypersurfaces in complex hyperbolic spaces
Jurgen Berndt, Jose Carlos Diaz-Ramos
We study the geometry of homogeneous hypersurfaces and their focal sets in complex hyperbolic spaces. In particular, we provide a characterization of the focal set in terms of its…
Where do moving punctures go?
Mark Hannam, Sascha Husa, Niall Ó Murchadha +3
Currently the most popular method to evolve black-hole binaries is the ``moving puncture'' method. It has recently been shown that when puncture initial data for a Schwarzschild bl…
The Einstein constraints: uniqueness and non-uniqueness in the conformal thin sandwich approach
Thomas W. Baumgarte, Niall Ó Murchadha, Harald P. Pfeiffer
We study the appearance of multiple solutions to certain decompositions of Einstein's constraint equations. Pfeiffer and York recently reported the existence of two branches of sol…
Keck Infrared Observations of GRO J0422+32 in Quiescence
Mark T. Reynolds, Paul J. Callanan, Alexei V. Filippenko
We present Keck K-band photometry and low-resolution H & K-band spectroscopy of the X-ray nova GRO J0422+32 obtained while the system was in the quiescent state. No clear ellipsoid…