Publications (61)
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…
Search method for long-duration gravitational-wave transients from neutron stars
Reinhard Prix, Stefanos Giampanis, Chris Messenger
We introduce a search method for a new class of gravitational-wave signals, namely long-duration O(hours - weeks) transients from spinning neutron stars. We discuss the astrophysic…
Optimally setting up directed searches for continuous gravitational waves in Advanced LIGO O1 data
Jing Ming, Maria Alessandra Papa, Badri Krishnan +6
In this paper we design a search for continuous gravitational waves from three supernova remnants: Vela Jr., Cassiopeia A (Cas A) and G347.3. These systems might harbor rapidly rot…
Relativistic solution of Iordanskii problem in multi-constituent superfluid mechanics
Brandon Carter, David Langlois, Reinhard Prix
Flow past a line vortex in a simple perfect fluid or superfluid gives rise to a transverse Magnus force that is given by the well known Joukowski lift formula. The problem of gener…
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…
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.…
Variational description of multi-fluid hydrodynamics: Uncharged fluids
Reinhard Prix
We present a formalism for Newtonian multi-fluid hydrodynamics derived from an unconstrained variational principle. This approach provides a natural way of obtaining the general eq…
Slowly Rotating Two-Fluid Neutron Star Model
Reinhard Prix
We study stationary axisymmetric configurations of a star model consisting of two barotropic fluids, which are uniformly rotating at two different rotation rates. Analytic approxim…
Transformer Networks for Continuous Gravitational-wave Searches
Prasanna. M. Joshi, Reinhard Prix
Wide-parameter-space searches for continuous gravitational waves using semi-coherent matched-filter methods require enormous computing power, which limits their achievable sensitiv…
Large-kernel Convolutional Neural Networks for Wide Parameter-Space Searches of Continuous Gravitational Waves
Prasanna Mohan Joshi, Reinhard Prix
The sensitivity of wide-parameter-space searches for continuous gravitational waves (CWs) is limited by their high computational cost. Deep learning is being studied as an alternat…
Relativistic numerical models for stationary superfluid Neutron Stars
Reinhard Prix, Jerome Novak, G. L. Comer
We have developed a theoretical model and a numerical code for stationary rotating superfluid neutron stars in full general relativity. The underlying two-fluid model is based on C…
Search for continuous gravitational waves from the pulsar J0435+3233
Brian McGloughlin, Jing Ming, Maria Alessandra Papa +6
We perform a search for continuous gravitational waves from J0435+3233 using LIGO O4a public data. J0435+3233 is unique among millisecond pulsars as it exhibits an exceptionally la…
Optimising the choice of analysis method for all-sky searches for continuous gravitational waves with Einstein@Home
Sinead Walsh, Karl Wette, Maria Alessandra Papa +1
Rapidly rotating neutron stars are promising sources of continuous gravitational waves for the LIGO and Virgo observatories. The majority of neutron stars in our galaxy have not be…
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…
Bogomol'nyi Limit For Magnetic Vortices In Rotating Superconductor
Brandon Carter, David Langlois, Reinhard Prix
This work is the sequel of a previous investigation of stationary and cylindrically symmetric vortex configurations for simple models representing an incompressible non-relativisti…
Line-robust statistics for continuous gravitational waves: safety in the case of unequal detector sensitivities
David Keitel, Reinhard Prix
The multi-detector F-statistic is close to optimal for detecting continuous gravitational waves (CWs) in Gaussian noise. However, it is susceptible to false alarms from instrumenta…
OctApps: a library of Octave functions for continuous gravitational-wave data analysis
Karl Wette, Reinhard Prix, David Keitel +4
Gravitational waves are minute ripples in spacetime, first predicted by Einstein's general theory of relativity in 1916. Gravitational waves from rapidly-rotating neutron stars, wh…
Adiabatic oscillations of non-rotating superfluid neutron stars
Reinhard Prix, Michel Rieutord
We present results concerning the linear (radial and non-radial) oscillations of non-rotating superfluid neutron stars in Newtonian physics. We use a simple two-fluid model to desc…
Energy of Magnetic Vortices in Rotating Superconductor
Brandon Carter, Reinhard Prix, David Langlois
We carry out a systematic analytic investigation of stationary and cylindrically symmetric vortex configurations for simple models representing an incompressible non-relativistic s…
Fully coherent follow-up of continuous gravitational-wave candidates: an application to Einstein@Home results
Miroslav Shaltev, Paola Leaci, Maria Alessandra Papa +1
We characterize and present the details of the follow-up method used on the most significant outliers of the Hough Einstein@Home all-sky search for continuous gravitational waves a…
Global parameter-space correlations of coherent searches for continuous gravitational waves
Reinhard Prix, Yousuke Itoh
The space of phase-parameters (sky-position, frequency, spindowns) of a coherent matched-filtering search for continuous gravitational waves from isolated neutron stars shows stron…
Novel neural-network architecture for continuous gravitational waves
Prasanna M. Joshi, Reinhard Prix
The high computational cost of wide-parameter-space searches for continuous gravitational waves (CWs) significantly limits the achievable sensitivity. This challenge has motivated…
Variational description of multi-fluid hydrodynamics: Coupling to gauge fields
Reinhard Prix
In this work we extend our previously developed formalism of Newtonian multi-fluid hydrodynamics to allow for coupling between the fluids and the electromagnetic and gravitational…
Search for Continuous Gravitational Waves: simple criterion for optimal detector networks
Reinhard Prix
We derive a simple algebraic criterion to select the optimal detector network for a coherent wide parameter-space (all-sky) search for continuous gravitational waves. Optimality in…
F-statistic search for white-dwarf binaries in the first Mock LISA Data Challenge
Reinhard Prix, John T. Whelan
The F-statistic is an optimal detection statistic for continuous gravitational waves, i.e., long-duration (quasi-)monochromatic signals with slowly-varying intrinsic frequency. Thi…
Template-based searches for gravitational waves: efficient lattice covering of flat parameter spaces
Reinhard Prix
The construction of optimal template banks for matched-filtering searches is an example of the sphere covering problem. For parameter spaces with constant-coefficient metrics a (ne…
Improved search for galactic white dwarf binaries in Mock LISA Data Challenge 1B using an F-statistic template bank
John T. Whelan, Reinhard Prix, Deepak Khurana
We report on our F-statistic search for white-dwarf binary signals in the Mock LISA Data Challenge 1B (MLDC1B). We focus in particular on the improvements in our search pipeline si…
Searching for Galactic White Dwarf Binaries in Mock LISA Data using an F-Statistic Template Bank
John T. Whelan, Reinhard Prix, Deepak Khurana
We describe an F-statistic search for continuous gravitational waves from galactic white-dwarf binaries in simulated LISA Data. Our search method employs a hierarchical template-gr…
Covariant Vortex In Superconducting-Superfluid-Normal Fluid Mixtures with Stiff Equation of State
Reinhard Prix
The integrals of motion for a cylindrically symmetric stationary vortex are obtained in a covariant description of a mixture of interacting superconductors, superfluids and normal…
The search for continuous gravitational waves: metric of the multi-detector F-statistic
Reinhard Prix
We develop a general formalism for the parameter-space metric of the multi-detector F-statistic, which is a matched-filtering detection statistic for continuous gravitational waves…
Implementation of a new weave-based search pipeline for continuous gravitational waves from known binary systems
Arunava Mukherjee, Reinhard Prix, Karl Wette
Scorpius X-1 (Sco X-1) has long been considered one of the most promising targets for detecting continuous gravitational waves with ground-based detectors. Observational searches f…
Statistical characterization of pulsar glitches and their potential impact on searches for continuous gravitational waves
Gregory Ashton, Reinhard Prix, David Ian Jones
Continuous gravitational waves from neutron stars could provide an invaluable resource to learn about their interior physics. A common search method involves matched filtering a mo…
Directed searches for continuous gravitational waves from binary systems: parameter-space metrics and optimal Scorpius X-1 sensitivity
Paola Leaci, Reinhard Prix
We derive simple analytic expressions for the (coherent and semi-coherent) phase metrics of continuous-wave sources in low-eccentricity binary systems, both for the long-segment an…
Search for Continuous Gravitational Waves: Optimal StackSlide method at fixed computing cost
Reinhard Prix, Miroslav Shaltev
Coherent wide parameter-space searches for continuous gravitational waves are typically limited in sensitivity by their prohibitive computing cost. Therefore semi-coherent methods…
High-frequency continuous gravitational waves searched in LIGO O3 public data with Einstein@Home
Brian McGloughlin, Benjamin Steltner, Jasper Martins +6
We search for nearly-monochromatic gravitational wave signals with frequencies and spin-down $-2.7\times10^{-9}~\textrm{Hz}\,\tex…
Bayesian Framework to Follow-up Continuous Gravitational Wave Candidates from Deep Surveys
Jasper Martins, Maria Alessandra Papa, Benjamin Steltner +2
Broad all-sky searches for continuous gravitational waves have high computational costs and require hierarchical pipelines. The sensitivity of these approaches is set by the initia…
Deep-Learning Continuous Gravitational Waves: Multiple detectors and realistic noise
Christoph Dreissigacker, Reinhard Prix
The sensitivity of wide-parameter-space searches for continuous gravitational waves is limited by computational cost. Recently it was shown that Deep Neural Networks (DNNs) can per…
A semicoherent glitch-robust continuous gravitational wave search
Gregory Ashton, Reinhard Prix, Ian Jones
Continuous gravitational-wave signals from isolated non-axisymmetric rotating neutron stars may undergo episodic spin-up events known as glitches. If unmodelled by a search, these…
Bayesian versus frequentist upper limits
Christian Röver, Chris Messenger, Reinhard Prix
While gravitational waves have not yet been measured directly, data analysis from detection experiments commonly includes an upper limit statement. Such upper limits may be derived…
New Coordinates for the Amplitude Parameter Space of Continuous Gravitational Waves
John T. Whelan, Reinhard Prix, Curt J. Cutler +1
The parameter space for continuous gravitational waves (GWs) can be divided into amplitude parameters (signal amplitude, inclination and polarization angles describing the orientat…
The Mock LISA Data Challenges: from Challenge 3 to Challenge 4
Stanislav Babak, John G. Baker, Matthew J. Benacquista +27
The Mock LISA Data Challenges are a program to demonstrate LISA data-analysis capabilities and to encourage their development. Each round of challenges consists of one or more data…
Search for continuous gravitational waves: Improving robustness versus instrumental artifacts
David Keitel, Reinhard Prix, Maria Alessandra Papa +2
The standard multidetector F-statistic for continuous gravitational waves is susceptible to false alarms from instrumental artifacts, for example monochromatic sinusoidal disturban…
Analytic weak-signal approximation of the Bayes factor for continuous gravitational waves
Reinhard Prix
We generalize the targeted -statistic for continuous gravitational waves by modeling the -prior as a half-Gaussian distribution with scale parameter . This app…
PyFstat: a Python package for continuous gravitational-wave data analysis
David Keitel, Rodrigo Tenorio, Gregory Ashton +1
Gravitational waves in the sensitivity band of ground-based detectors can be emitted by a number of astrophysical sources, including not only binary coalescences, but also individu…
The Mock LISA Data Challenges: from Challenge 1B to Challenge 3
Stanislav Babak, John G. Baker, Matthew J. Benacquista +27
The Mock LISA Data Challenges are a programme to demonstrate and encourage the development of LISA data-analysis capabilities, tools and techniques. At the time of this workshop, t…
Einstein@Home all-sky "bucket" search for continuous gravitational waves in LIGO O3 public data
Brian McGloughlin, Jasper Martins, Benjamin Steltner +5
We conduct an all-sky search for continuous gravitational waves using LIGO O3 public data from the Hanford and Livingston detectors. We search for nearly-monochromatic signals with…
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…
Postprocessing methods used in the search for continuous gravitational-wave signals from the Galactic Center
Berit Behnke, Maria Alessandra Papa, Reinhard Prix
The search for continuous gravitational-wave signals requires the development of techniques that can effectively explore the low-significance regions of the candidate set. In this…
Deep-Learning continuous gravitational waves
Christoph Dreissigacker, Rahul Sharma, Chris Messenger +2
We present a first proof-of-principle study for using deep neural networks (DNNs) as a novel search method for continuous gravitational waves (CWs) from unknown spinning neutron st…
Fast and Accurate Sensitivity Estimation for Continuous-Gravitational-Wave Searches
Christoph Dreissigacker, Reinhard Prix, Karl Wette
This paper presents an efficient numerical sensitivity-estimation method and implementation for continuous-gravitational-wave searches, extending and generalizing an earlier analyt…
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…
Coincident detection significance in multimessenger astronomy
Gregory Ashton, Eric Burns, Tito Dal Canton +6
We derive a Bayesian criterion for assessing whether signals observed in two separate data sets originate from a common source. The Bayes factor for a common vs. unrelated origin o…
An F-statistic based multi-detector veto for detector artifacts in continuous-wave gravitational wave data
David Keitel, Reinhard Prix, Maria Alessandra Papa +1
Continuous gravitational waves (CW) are expected from spinning neutron stars with non-axisymmetric deformations. A network of interferometric detectors (LIGO, Virgo and GEO600) is…
Report on the second Mock LISA Data Challenge
Stanislav Babak, John G. Baker, Matthew J. Benacquista +40
The Mock LISA Data Challenges are a program to demonstrate LISA data-analysis capabilities and to encourage their development. Each round of challenges consists of several data set…
Flat parameter-space metric for all-sky searches for gravitational-wave pulsars
Karl Wette, Reinhard Prix
All-sky, broadband, coherent searches for gravitational-wave pulsars are computationally limited. It is therefore important to make efficient use of available computational resourc…
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…
Advances in our understanding of the free precession candidate PSR B1828-11
Gregory Ashton, David Ian Jones, Reinhard Prix
We highlight the advances and difficulties in understanding PSR B1828-11, which undergoes long-term periodic modulations in its timing and pulse shape over several years. A model c…
Hierarchical multi-stage MCMC follow-up of continuous gravitational wave candidates
Gregory Ashton, Reinhard Prix
Leveraging Markov chain Monte Carlo (MCMC) optimization of the F-statistic, we introduce a method for the hierarchical follow-up of continuous gravitational wave candidates identif…
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…
Fully coherent follow-up of continuous gravitational-wave candidates
Miroslav Shaltev, Reinhard Prix
The search for continuous gravitational waves from unknown isolated sources is computationally limited due to the enormous parameter space that needs to be covered and the weakness…
Targeted search for continuous gravitational waves: Bayesian versus maximum-likelihood statistics
Reinhard Prix, Badri Krishnan
We investigate the Bayesian framework for detection of continuous gravitational waves (GWs) in the context of targeted searches, where the phase evolution of the GW signal is assum…