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          Institute: MPI für Gravitationsphysik     Collection: Observational Relativity and Cosmology     Display Documents



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ID: 379286.0, MPI für Gravitationsphysik / Observational Relativity and Cosmology
Random template banks and relaxed lattice coverings
Authors:Prix, Reinhard; Messenger, Christopher; Papa, Maria Alessandra
Date of Publication (YYYY-MM-DD):2009-05
Title of Journal:Physical Review D
Volume:79
Issue / Number:10
Sequence Number of Article:104017
Review Status:not specified
Audience:Not Specified
Abstract / Description:Template-based searches for gravitational waves are often limited by the computational cost associated with searching large parameter spaces. The study of efficient template banks, in the sense of using the smallest number of templates, is therefore of great practical interest. The "traditional" approach to template-bank construction requires every point in parameter space to be covered by at least one template, which rapidly becomes inefficient at higher dimensions. Here we study an alternative approach, where any point in parameter space is covered only with a given probability < 1. We find that by giving up complete coverage in this way, large reductions in the number of templates are possible, especially at higher dimensions. The prime examples studied here are "random template banks", in which templates are placed randomly with uniform probability over the parameter space. In addition to its obvious simplicity, this method turns out to be surprisingly efficient. We analyze the statistical properties of such random template banks, and compare their efficiency to traditional lattice coverings. We further study "relaxed" lattice coverings (using Zn and An* lattices), which similarly cover any signal location only with probability < 1. The relaxed An* lattice is found to yield the most efficient template banks at low dimensions (n < 10), while random template banks increasingly outperform any other method at higher dimensions.
External Publication Status:published
Document Type:Article
Communicated by:Bruce Allen
Affiliations:MPI für Gravitationsphysik/Teilinstitut Hannover
MPI für Gravitationsphysik/Observational Relativity and Cosmology
MPI für Gravitationsphysik/Astrophysical Relativity
Identifiers:LOCALID:arXiv:0809.5223v1 [gr-qc]
URL:http://arxiv.org/abs/0809.5223
DOI:10.1103/PhysRevD.79.104017
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