Publications (62)
CBR anisotropy from primordial gravitational waves in inflationary cosmologies
Bruce Allen, Scott Koranda
We examine stochastic temperature fluctuations of the cosmic background radiation (CBR) arising via the Sachs-Wolfe effect from gravitational wave perturbations produced in the ear…
An Einstein@home search for continuous gravitational waves from Cassiopeia A
Sylvia J. Zhu, Maria Alessandra Papa, Heinz-Bernd Eggenstein +9
We report the results of a directed search for continuous gravitational-wave emission in a broad frequency range (between 50 and 1000 Hz) from the central compact object of the sup…
Detecting relic gravitational radiation from string cosmology with LIGO
Bruce Allen, Ram Brustein
A characteristic spectrum of relic gravitational radiation is produced by a period of ``stringy inflation" in the early universe. This spectrum is unusual, because the energy-densi…
The Voronoi Region of the Barnes-Wall Lattice
Daniel Pook-Kolb, Erik Agrell, Bruce Allen
We give a detailed description of the Voronoi region of the Barnes-Wall lattice , including its vertices, relevant vectors, and symmetry group. The exact value of its quan…
A stochastic template placement algorithm for gravitational wave data analysis
Ian Harry, Bruce Allen, B. S. Sathyaprakash
This paper presents an algorithm for constructing matched-filter template banks in an arbitrary parameter space. The method places templates at random, then removes those which are…
Modeling the bounce of a gas-filled ball
Martin Allen, Bruce Allen
The coefficient of restitution characterizes the energy retained when a ball bounces, and can easily be measured in an ``at home'' experiment. For thin-walled gas-filled balls…
Continuous Gravitational Waves from Isolated Galactic Neutron Stars in the Advanced Detector Era
Leslie Wade, Xavier Siemens, David L. Kaplan +2
We consider a simulated population of isolated Galactic neutron stars. The rotational frequency of each neutron star evolves through a combination of electromagnetic and gravitatio…
Results from an Einstein@Home search for continuous gravitational waves from Cassiopeia A, Vela Jr. and G347.3
Jing Ming, Maria Alessandra Papa, Avneet Singh +9
We report results of the most sensitive search to date for periodic gravitational waves from Cassiopeia A, Vela Jr. and G347.3 with frequency between 20 and 1500 Hz. The search was…
Variance of the Hellings-Downs Correlation
Bruce Allen
Gravitational waves (GWs) create correlations in the arrival times of pulses from different pulsars. The expected correlation as a function of the angle between the d…
Search for Continuous Gravitational Waves from the Central Compact Objects in Supernova Remnants Cassiopeia A, Vela Jr. and G347.3-0.5
M. Alessandra Papa, Jing Ming, Eric V. Gotthelf +6
We perform a sub-threshold follow-up search for continuous nearly-monochromatic gravitational waves from the central compact objects associated with the supernova remnants Vela Jr.…
On the best lattice quantizers
Erik Agrell, Bruce Allen
A lattice quantizer approximates an arbitrary real-valued source vector with a vector taken from a specific discrete lattice. The quantization error is the difference between the s…
Optimization and Identification of Lattice Quantizers
Erik Agrell, Daniel Pook-Kolb, Bruce Allen
Lattices with minimal normalized second moments are designed using a new numerical optimization algorithm. Starting from a random lower-triangular generator matrix and applying sto…
Automatic cross-talk removal from multi-channel data
Bruce Allen, Wensheng Hua, Adrian Ottewill
A technique is described for removing interference from a signal of interest ("channel 1") which is one of a set of N time-domain instrumental signals ("channels 1 to N"). We assum…
CBR Anisotropy from Primordial Gravitational Waves in Two-Component Inflationary Cosmology
Scott Koranda, Bruce Allen
We examine stochastic temperature fluctuations of the cosmic background radiation (CBR) arising via the Sachs-Wolfe effect from gravitational wave perturbations produced in the ear…
Spherical ansatz for parameter-space metrics
Bruce Allen
A fundamental quantity in signal analysis is the metric on parameter space, which quantifies the fractional "mismatch" between two (time- or frequency-domain) waveform…
Exact calculation of quantizer constants for arbitrary lattices
Daniel Pook-Kolb, Bruce Allen, Erik Agrell
We present an algorithm for the exact computer-aided construction of the Voronoi cells of lattices with known symmetry group. Our algorithm scales better than linearly with the tot…
Performance of Random Template Banks
Bruce Allen
When searching for new gravitational-wave or electromagnetic sources, the signal parameters (masses, sky location, frequencies,...) are unknown. In practice, one hunts for sign…
Waveforms for Gravitational Radiation from Cosmic String Loops
Bruce Allen, Adrian C. Ottewill
We obtain general formulae for the plus- and cross- polarized waveforms of gravitational radiation emitted by a cosmic string loop in transverse, traceless (synchronous, harmonic)…
Gravitational Wave Detector Sites
Bruce Allen
Locations and orientations of current and proposed laser-interferometric gravitational wave detectors are given in tabular form.
Source anisotropies and pulsar timing arrays
Bruce Allen, Deepali Agarwal, Joseph D. Romano +1
Pulsar timing arrays (PTA) hunt for gravitational waves (GW) by searching for the correlations that GWs induce in the time-of-arrival residuals from different pulsars. If the GW so…
Parametric Lattices Are Better Quantizers in Dimensions 13 and 14
Daniel Pook-Kolb, Erik Agrell, Bruce Allen
New lattice quantizers with lower normalized second moments than previously reported are constructed in 13 and 14 dimensions and conjectured to be optimal. Our construction combine…
Detecting a stochastic background of gravitational radiation: Signal processing strategies and sensitivities
Bruce Allen, Joseph D. Romano
We analyze the signal processing required for the optimal detection of a stochastic background of gravitational radiation using laser interferometric detectors. Starting with basic…
Making h(t) for LIGO
Xavier Siemens, Bruce Allen, Jolien Creighton +2
The conversion of the read-out from the anti-symmetric port of the LIGO interferometers into gravitational strain has thus far been performed in the frequency domain. Here we descr…
Analytic Results for the Gravitational Radiation from a Class of Cosmic String Loops
Bruce Allen, Paul Casper, Adrian Ottewill
Cosmic string loops are defined by a pair of periodic functions and , which trace out unit-length closed curves in three-dimensional space. We consider a particu…
CBR Temperature Fluctuations Induced by Gravitational Waves in a Spatially-Closed Inflationary Universe
Bruce Allen, Robert Caldwell, Scott Koranda
Primordial gravitational waves are created during the de Sitter phase of an exponentially-expanding (inflationary) universe, due to quantum zero-point vacuum fluctuations. These wa…
Results of an all-sky high-frequency Einstein@Home search for continuous gravitational waves in LIGO's fifth science run
Avneet Singh, Maria Alessandra Papa, Heinz-Bernd Eggenstein +7
We present results of a high-frequency all-sky search for continuous gravitational waves from isolated compact objects in LIGO's 5th Science Run (S5) data, using the computing powe…
Gravitational wave stochastic background from cosmological particle decay
Bruce Allen
We assume that the cosmological dark matter is composed of massive neutral scalar particles that decay into two massless particles. The decay produces a stochastic background of gr…
Long Range Effects of Cosmic String Structure
Bruce Allen, Bernard S. Kay, Adrian C. Ottewill
We combine and further develop ideas and techniques of Allen \& Ottewill, Phys. Rev.D, {\bf 42}, 2669 (1990) and Kay \& Studer Commun. Math. Phys., {\bf 139}, 103 (1991) for calcul…
Glued lattices are better quantizers than
Erik Agrell, Daniel Pook-Kolb, Bruce Allen
40 years ago, Conway and Sloane proposed using the highly symmetrical Coxeter-Todd lattice for quantization, and estimated its second moment. Since then, all published lis…
Detection of Anisotropies in the Gravitational-Wave Stochastic Background
Bruce Allen, Adrian C. Ottewill
By correlating the signals from a pair of gravitational-wave detectors, one can undertake sensitive searches for a stochastic background of gravitational radiation. If the stochast…
Optimal Template Banks
Bruce Allen
When searching for new gravitational-wave or electromagnetic sources, the signal parameters (masses, sky location, frequencies,...) are unknown. In practice, one hunts for sign…
The International Pulsar Timing Array checklist for the detection of nanohertz gravitational waves
Bruce Allen, Sanjeev Dhurandhar, Yashwant Gupta +5
Pulsar timing arrays (PTAs) provide a way to detect gravitational waves at nanohertz frequencies. In this band, the most likely signals are stochastic, with a power spectrum that r…
The optimal lattice quantizer in nine dimensions
Bruce Allen, Erik Agrell
The optimal lattice quantizer is the lattice which minimizes the (dimensionless) second moment . In dimensions to , it has been proven that the optimal lattice quantizer…
Pulsar timing array analysis in a Legendre polynomial basis
Bruce Allen, Arian L. von Blanckenburg, Ken D. Olum
We use Legendre polynomials, previously employed in this context by Lee et al., van Haasteren and Levin, and Pitrou and Cusin, to model signals in pulsar timing arrays. These repla…
Exploiting Large-Scale Correlations to Detect Continuous Gravitational Waves
Holger J. Pletsch, Bruce Allen
Fully coherent searches (over realistic ranges of parameter space and year-long observation times) for unknown sources of continuous gravitational waves are computationally prohibi…
Template banks based on and lattices
Bruce Allen, Andrey A. Shoom
Matched filtering is a traditional method used to search a data stream for signals. If the source (and hence its parameters) are unknown, many filters must be employed. These f…
Maximally Symmetric Spin-Two Bitensors on and
Bruce Allen
The transverse traceless spin-two tensor harmonics on and may be denoted by . The index labels the (degenerate) eigenvalues of the Laplacian $\squa…
Is the squeezing of relic gravitational waves produced by inflation detectable?
Bruce Allen, Eanna Flanagan, Maria Alessandra Papa
Grishchuk has shown that the stochastic background of gravitational waves produced by an inflationary phase in the early Universe has an unusual property: it is not a stationary Ga…
A chi-squared time-frequency discriminator for gravitational wave detection
Bruce Allen
Searches for known waveforms in gravitational wave detector data are often done using matched filtering. When used on real instrumental data, matched filtering often does not perfo…
Data-Driven Approaches to Searches for the Technosignatures of Advanced Civilizations
T. Joseph W. Lazio, S. G. Djorgovski, Andrew Howard +19
Humanity has wondered whether we are alone for millennia. The discovery of life elsewhere in the Universe, particularly intelligent life, would have profound effects, comparable to…
Robust statistics for deterministic and stochastic gravitational waves in non-Gaussian noise I: Frequentist analyses
Bruce Allen, Jolien D. E. Creighton, Eanna E. Flanagan +1
Gravitational wave detectors will need optimal signal-processing algorithms to extract weak signals from the detector noise. Most algorithms designed to date are based on the unrea…
FINDCHIRP: an algorithm for detection of gravitational waves from inspiraling compact binaries
Bruce Allen, Warren G. Anderson, Patrick R. Brady +2
Matched-filter searches for gravitational waves from coalescing compact binaries by the LIGO Scientific Collaboration use the FINDCHIRP algorithm: an implementation of the optimal…
Optimal reconstruction of the Hellings and Downs correlation
Bruce Allen, Joseph D. Romano
Pulsar timing arrays (PTAs) detect gravitational waves (GWs) via the correlations they create in the arrival times of pulses from different pulsars. The mean correlation, a functio…
Hellings and Downs correlation of an arbitrary set of pulsars
Bruce Allen, Joseph D. Romano
Pulsar timing arrays (PTAs) detect gravitational waves (GWs) via the correlations they induce in the arrival times of pulses from different pulsars. We assume that the GWs are desc…
A Closed-Form Expression for the Gravitational Radiation Rate from Cosmic Strings
Bruce Allen, Paul Casper
We present a new formula for the rate at which cosmic strings lose energy into gravitational radiation, valid for all piecewise-linear cosmic string loops. At any time, such a loop…
Can a "pure vector" gravitational wave mimic a "pure tensor" one?
Bruce Allen
In the general theory of relativity, gravitational waves have two possible polarizations, which are transverse and traceless with helicity . Some alternatives theories conta…
Answers to frequently asked questions about the pulsar timing array Hellings and Downs curve
Joseph D. Romano, Bruce Allen
We answer frequently asked questions (FAQs) about the Hellings and Downs correlation curve -- the "smoking-gun" signature that pulsar timing arrays (PTAs) have detected gravitation…
GRAVITATIONAL RADIATION FROM REALISTIC COSMIC STRING LOOPS
Paul Casper, Bruce Allen
We examine the rates at which energy and momentum are radiated into gravitational waves by a large set of realistic cosmic string loops. The string loops are generated by numerical…
SETI@home: Data Analysis and Findings
David P. Anderson, Eric J. Korpela, Dan Werthimer +2
SETI@home is a radio Search for Extraterrestrial Intelligence (SETI) project that looks for technosignatures in data recorded at the Arecibo Observatory. The data were collected ov…
Hierarchical follow-up of sub-threshold candidates of an all-sky Einstein@Home search for continuous gravitational waves on LIGO sixth science run data
Maria Alessandra Papa, Heinz-Bernd Eggenstein, Sinéad Walsh +12
We report results of an all-sky search for periodic gravitational waves with frequency between 50 and 510 Hz from isolated compact objects, i.e. neutron stars. A new hierarchical m…
Pulsar timing array source ensembles
Bruce Allen, Serena Valtolina
The stochastic gravitational wave background for pulsar timing arrays is often modeled by a Gaussian ensemble which is isotropic and unpolarized. However, the Universe has a discre…
Deep Einstein@Home search for Continuous Gravitational Waves from the Central Compact Objects in the Supernova Remnants Vela Jr. and G347.3-0.5 using LIGO public data
Jing Ming, Maria Alessandra Papa, Heinz-Bernd Eggenstein +5
We perform a search for continuous nearly monochromatic gravitational waves from the central compact objects associated with the supernova remnants Vela Jr. and G347.3 using LIGO O…
Harmonic spectrum of pulsar timing array angular correlations
Bruce Allen, Joseph D. Romano
Pulsar timing arrays (PTAs) detect gravitational waves (GWs) via the correlations they create in the arrival times of pulses from different pulsars. The mean correlation, a functio…
Optimal robust detection statistics for pulsar timing arrays
Rutger van Haasteren, Bruce Allen, Joseph D. Romano
Pulsar timing arrays (PTAs) seek to detect a nano-Hz stochastic gravitational-wave background (GWB) by searching for the characteristic Hellings and Downs angular pattern of timing…
Optimal Strategies for Sinusoidal Signal Detection
Bruce Allen, Maria Alessandra Papa, Bernard F. Schutz
We derive and study optimal and nearly-optimal strategies for the detection of sinusoidal signals hidden in additive (Gaussian and non-Gaussian) noise. Such strategies are an essen…
Closed Form Expression for the Momentum Radiated from Cosmic String Loops
Bruce Allen, Paul Casper, Adrian Ottewill
We modify the recent analytic formula given by Allen and Casper for the rate at which piecewise linear cosmic string loops lose energy to gravitational radiation to yield the analo…
Pulsar Timing Array Harmonic Analysis and Source Angular Correlations
Bruce Allen
Gravitational waves (GWs) influence the arrival times of radio signals coming from pulsars. Here, we investigate the harmonic space approach to describing a pulsar's response to GW…
Results from an Einstein@Home search for continuous gravitational waves from G347.3 at low frequencies in LIGO O2 data
Jing Ming, Maria Alessandra Papa, Heinz-Bernd Eggenstein +5
We present results of a search for periodic gravitational wave signals with frequency between 20 and 400 Hz, from the neutron star in the supernova remnant G347.3-0.5, using LIGO O…
The stochastic gravity-wave background: sources and detection
Bruce Allen
A world-wide effort is now underway to build gravitational wave detectors based on highly-sensitive laser interferometers. When data from detectors at different sites is properly c…
Robust statistics for deterministic and stochastic gravitational waves in non-Gaussian noise. II: Bayesian analyses
Bruce Allen, Jolien D. E. Creighton, Eanna E. Flanagan +1
In a previous paper (gr-qc/0105100) we derived a set of near-optimal signal detection techniques for gravitational wave detectors whose noise probability distributions contain non-…
New searches for continuous gravitational waves from seven fast pulsars
Anjana Ashok, Banafsheh Beheshtipour, Maria Alessandra Papa +6
We conduct searches for continuous gravitational waves from seven pulsars, that have not been targeted in continuous wave searches of Advanced LIGO data before. We target emission…
Stochastic gravitational-wave background search using data from five pulsar timing arrays
Wang-Wei Yu, Bruce Allen
Using public pulse time-of-arrival data from five pulsar timing arrays (PTAs), we search for a stationary, isotropic, and unpolarized nHz stochastic gravitational-wave background (…