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13 papers · 1 filter
The NANOGrav Nine-Year Data Set: Noise Budget for Pulsar Arrival Times on Intraday Timescales
M. T. Lam, J. M. Cordes, S. Chatterjee +21
The use of pulsars as astrophysical clocks for gravitational wave experiments demands the highest possible timing precision. Pulse times of arrival (TOAs) are limited by stochastic…
Fourientation activities and the Tutte polynomial
Spencer Backman, Sam Hopkins, Lorenzo Traldi
A fourientation of a graph is a choice for each edge of the graph whether to orient that edge in either direction, leave it unoriented, or biorient it. We may naturally view fo…
Classification of eventually periodic subshifts
Benjamín A. Itzá-Ortiz, Meghan B. Malachi, Austin Marstaller +2
We provide a classification of eventually periodic subshifts up to conjugacy and flow equivalence. We use our results to prove that each skew Sturmian subshift is conjugate to exac…
Pattern avoidance for set partitions à la Klazar
Jonathan Bloom, Dan Saracino
In 2000 Klazar introduced a new notion of pattern avoidance in the context of set partitions of . The purpose of the present paper is to undertake a study of t…
The NANOGrav Nine-year Data Set: Astrometric Measurements of 37 Millisecond Pulsars
Allison M. Matthews, David J. Nice, Emmanuel Fonseca +18
Using the nine-year radio-pulsar timing data set from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), collected at Arecibo Observatory and the Green Ba…
The NANOGrav Nine-year Data Set: Limits on the Isotropic Stochastic Gravitational Wave Background
Zaven Arzoumanian, Adam Brazier, Sarah Burke-Spolaor +45
We compute upper limits on the nanohertz-frequency isotropic stochastic gravitational wave background (GWB) using the 9-year data release from the North American Nanohertz Observat…