1 code implementation • 22 Sep 2022 • Marlin B. Schäfer, Ondřej Zelenka, Alexander H. Nitz, He Wang, Shichao Wu, Zong-Kuan Guo, Zhoujian Cao, Zhixiang Ren, Paraskevi Nousi, Nikolaos Stergioulas, Panagiotis Iosif, Alexandra E. Koloniari, Anastasios Tefas, Nikolaos Passalis, Francesco Salemi, Gabriele Vedovato, Sergey Klimenko, Tanmaya Mishra, Bernd Brügmann, Elena Cuoco, E. A. Huerta, Chris Messenger, Frank Ohme
The final of the 4 provided datasets contained real noise from the O3a observing run and signals up to a duration of 20 seconds with the inclusion of precession effects and higher order modes.
no code implementations • 24 Aug 2021 • Marlin B. Schäfer, Alexander H. Nitz
The network is applied to the data from both observatories independently and we check for events coincident in time between the two.
1 code implementation • 7 Jun 2021 • Marlin B. Schäfer, Ondřej Zelenka, Alexander H. Nitz, Frank Ohme, Bernd Brügmann
We find that the deep learning algorithms can generalize low signal-to-noise ratio (SNR) signals to high SNR ones but not vice versa.
2 code implementations • 1 Feb 2021 • Alexander H. Nitz, Yi-Fan Wang
Sub-solar mass black holes are a signature of primordial origin black holes, which may be a component of dark matter.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
1 code implementation • 28 Jan 2021 • Yi-Fan Wang, Alexander H. Nitz
Alternatively, primordial black holes as dark matter could also form binaries in the late universe due to dynamical encounters and gravitational-wave braking.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
2 code implementations • 23 Oct 2020 • Alexander H. Nitz, Collin D. Capano
For the uniform in mass-ratio prior, we find that the component masses are $m_1^{\mathrm{src}} = 168_{-61}^{+15}\,\mathrm{M}_{\odot}$ and $m_2^{\mathrm{src}} = 16_{-3}^{+33}\,\mathrm{M}_{\odot}$.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
1 code implementation • 9 Sep 2020 • Alexander H. Nitz, Marlin Schäfer, Tito Dal Canton
We find that for a fiducial rate of binary neutron star mergers of $1000 ~\mathrm{Gpc}^{-3} \mathrm{yr}^{-1}$, the Design, A+, and Voyager era networks can provide 18, 54, and 195s of warning for one source per year of observing, respectively, with a sky localization area $<$100 deg$^2$ at a $90\%$ credible level.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
1 code implementation • 5 Aug 2020 • Collin D. Capano, Alexander H. Nitz
Using these events, we search for physics beyond GR by allowing the source parameters measured from the sub-dominant harmonics to deviate from that of the dominant mode.
General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena
1 code implementation • 2 Jun 2020 • Marlin B. Schäfer, Frank Ohme, Alexander H. Nitz
Compared to other state-of-the-art machine learning algorithms, we find an improvement by a factor of 6 in sensitivity to signals with signal-to-noise ratio below 25.
1 code implementation • 28 May 2020 • Amber K. Lenon, Alexander H. Nitz, Duncan A. Brown
These signals were detected by matched-filter searches that assume the star's orbit has circularized by the time their gravitational-wave emission is observable.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
1 code implementation • 21 Apr 2020 • Alexander H. Nitz, Thomas Dent, Gareth S. Davies, Ian Harry
We also describe a procedure to assess candidates observed in a single detector when multiple detectors are observing.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
1 code implementation • 11 Oct 2019 • Alexander H. Nitz, Thomas Dent, Gareth S. Davies, Sumit Kumar, Collin D. Capano, Ian Harry, Simone Mazzon, Laura Nuttall, Andrew Lundgren, Marton Tápai
We identify a population of 14 binary black hole mergers with $p_{\mathrm{astro}} > 0. 5$ along with the GW170817 binary neutron star merger.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
1 code implementation • 25 Feb 2019 • Alexander H. Nitz, Alex B. Nielsen, Collin D. Capano
By comparing the rate of binary neutron star mergers to our search-estimated rate of false alarms, we estimate that there is a 1 in 4 chance this candidate is astrophysical in origin.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
1 code implementation • 22 Nov 2018 • Soumi De, Collin D. Capano, Christopher M. Biwer, Alexander H. Nitz, Duncan A. Brown
This paper presents the first public data release of samples from the posterior probability density function for the three binary black hole mergers---GW170104, GW170608, and GW170814---detected during the second observing run of the Advanced LIGO and Virgo observatories.
General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics
3 code implementations • 9 Nov 2018 • Alex B. Nielsen, Alexander H. Nitz, Collin D. Capano, Duncan A. Brown
We find that after subtracting the maximum likelihood waveform there are no statistically significant correlations between the residuals of the two detectors at the time of GW150914.
High Energy Astrophysical Phenomena
1 code implementation • 5 Nov 2018 • Alexander H. Nitz, Collin Capano, Alex B. Nielsen, Steven Reyes, Rebecca White, Duncan A. Brown, Badri Krishnan
The three most significant signals in our catalog correspond to the binary black hole mergers GW150914, GW151226, and LVT151012.
General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena
4 code implementations • 26 Jul 2018 • C. M. Biwer, Collin D. Capano, Soumi De, Miriam Cabero, Duncan A. Brown, Alexander H. Nitz, V. Raymond
We introduce new modules in the open-source PyCBC gravitational- wave astronomy toolkit that implement Bayesian inference for compact-object binary mergers.
Instrumentation and Methods for Astrophysics