scholarly journals All-sky search for long-duration gravitational-wave bursts in the third Advanced LIGO and Advanced Virgo run

2021 ◽  
Vol 104 (10) ◽  
Author(s):  
R. Abbott ◽  
T. D. Abbott ◽  
F. Acernese ◽  
K. Ackley ◽  
C. Adams ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
The Third ◽  
Long Duration ◽  
Wave Bursts

scholarly journals All-sky search for short gravitational-wave bursts in the third Advanced LIGO and Advanced Virgo run

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
R. Abbott ◽  
T. D. Abbott ◽  
F. Acernese ◽  
K. Ackley ◽  
C. Adams ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
The Third ◽  
Wave Bursts

scholarly journals Biases in parameter estimation from overlapping gravitational-wave signals in the third-generation detector era

2021 ◽  
Vol 104 (4) ◽  
Author(s):  
Anuradha Samajdar ◽  
Justin Janquart ◽  
Chris Van Den Broeck ◽  
Tim Dietrich
Keyword(s):  
Parameter Estimation ◽  
Gravitational Wave ◽  
Third Generation ◽  
The Third

scholarly journals Virgo and Gravitational-Wave Computing in Europe

2020 ◽  
Vol 245 ◽  
pp. 07050
Author(s):  
Stefano Bagnasco
Keyword(s):  
Gravitational Wave ◽  
Current Status ◽  
Low Latency ◽  
Observational Period ◽  
Compact Binaries ◽  
The Third ◽  
Compact Binary ◽  
Continuous Waves ◽  
The Us ◽  
Wave Event

Advanced Virgo is an interferometer for the detection of gravitational waves at the European Gravitational Observatory in Italy. Along with the two Advanced LIGO interferometers in the US, Advanced Virgo is being used to collect data from astrophysical sources such as compact binary coalescences and is currently running the third observational period, collecting gravitational wave event candidates at a rate of more than once per week. Data from the interferometer are processed by running search pipelines for several expected signals, from coalescing compact binaries to continuous waves and burst events. Furthermore, detector characterisation studies are run. Some of the processing needs to be done with low latency, to be able to provide triggers for other observatories and make multi-messenger observations possible. Deep searches are run offline on external computing centres. Thus, data needs also to be reliably and promptly distributed from the EGO site to computer centres in Europe and the US for further analysis and archival storage. Two of the defining characteristics of Virgo computing are the heterogeneity of the activities and the need to interoperate with LIGO. A very wide array of analysis pipelines differing in scientific target, implementation details and running environment assumptions have to be allowed to run ubiquitously and uniformly on dedicated resources and, in perspective, on heterogeneous infrastructures. The current status, possible strategies and outlook of Virgo computing are discussed.

scholarly journals Bayesian reconstruction of gravitational wave bursts using chirplets

2018 ◽  
Vol 97 (10) ◽  
Author(s):  
Margaret Millhouse ◽  
Neil J. Cornish ◽  
Tyson Littenberg
Keyword(s):  
Gravitational Wave ◽  
Bayesian Reconstruction ◽  
Wave Bursts

scholarly journals Sensitivity of the lower edge of the pair-instability black hole mass gap to the treatment of time-dependent convection

2020 ◽  
Vol 493 (3) ◽  
pp. 4333-4341 ◽  
Author(s):  
M Renzo ◽  
R J Farmer ◽  
S Justham ◽  
S E de Mink ◽  
Y Götberg ◽  
...  
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Time Scale ◽  
Turnover Time ◽  
Black Hole Mass ◽  
The Third ◽  
Mass Gap ◽  
Mixing Length Theory ◽  
State Assumption ◽  
Additional Equation

ABSTRACT Gravitational-wave detections are now probing the black hole (BH) mass distribution, including the predicted pair-instability mass gap. These data require robust quantitative predictions, which are challenging to obtain. The most massive BH progenitors experience episodic mass ejections on time-scales shorter than the convective turnover time-scale. This invalidates the steady-state assumption on which the classic mixing length theory relies. We compare the final BH masses computed with two different versions of the stellar evolutionary code $\tt{MESA}$: (i) using the default implementation of Paxton et al. (2018) and (ii) solving an additional equation accounting for the time-scale for convective deceleration. In the second grid, where stronger convection develops during the pulses and carries part of the energy, we find weaker pulses. This leads to lower amounts of mass being ejected and thus higher final BH masses of up to ∼$5\, \mathrm{M}_\odot$. The differences are much smaller for the progenitors that determine the maximum mass of BHs below the gap. This prediction is robust at $M_{\rm BH, max}\simeq 48\, \mathrm{M}_\odot$, at least within the idealized context of this study. This is an encouraging indication that current models are robust enough for comparison with the present-day gravitational-wave detections. However, the large differences between individual models emphasize the importance of improving the treatment of convection in stellar models, especially in the light of the data anticipated from the third generation of gravitational-wave detectors.

Two patterns of daily hypoxic exposure and their effects on measures of chemosensitivity in humans

2007 ◽  
Vol 103 (6) ◽  
pp. 1973-1978 ◽  
Author(s):  
Michael S. Koehle ◽  
A. William Sheel ◽  
William K. Milsom ◽  
Donald C. McKenzie
Keyword(s):  
Oxygen Saturation ◽  
Intermittent Hypoxia ◽  
Ventilatory Response ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen ◽  
Hypoxic Exposure ◽  
Hypoxic Ventilatory Response ◽  
The Third ◽  
Long Duration ◽  
The Mean

The purpose of this study was to compare chemoresponses following two different intermittent hypoxia (IH) protocols in humans. Ten men underwent two 7-day courses of poikilocapnic IH. The long-duration IH (LDIH) protocol consisted of daily 60-min exposures to normobaric 12% O2. The short-duration IH (SDIH) protocol comprised twelve 5-min bouts of 12% O2, separated by 5-min bouts of room air, daily. Isocapnic hypoxic ventilatory response (HVR) was measured daily during the protocol and 1 and 7 days following. Hypercapnic ventilatory response (HCVR) and CO2 threshold and sensitivity (by the modified Read rebreathing technique) were measured on days 1, 8, and 14. Following 7 days of IH, the mean HVR was significantly increased from 0.47 ± 0.07 and 0.47 ± 0.08 to 0.70 ± 0.06 and 0.79 ± 0.06 l·min−1·%SaO2−1 (LDIH and SDIH, respectively), where %SaO2 is percent arterial oxygen saturation. The increase in HVR reached a plateau after the third day. One week post-IH, HVR values were unchanged from baseline. HCVR increased from 3.0 ± 0.4 to 4.0 ± 0.5 l·min−1·mmHg−1. In both the hyperoxic and hypoxic modified Read rebreathing tests, the slope of the CO2/ventilation plot was unchanged by either intervention, but the CO2/ventilation curve shifted to the left following IH. There were no correlations between the changes in response to hypoxia and hypercapnia. There were no significant differences between the two IH protocols for any measures, indicating that comparable changes in chemoreflex control occur with either protocol. These results also suggest that the two methods of measuring CO2 response are not completely concordant and that the changes in CO2 control do not correlate with the increase in the HVR.

scholarly journals Comparison of filters for detecting gravitational wave bursts in interferometric detectors

2003 ◽  
Vol 67 (6) ◽  
Author(s):  
Nicolas Arnaud ◽  
Matteo Barsuglia ◽  
Marie-Anne Bizouard ◽  
Violette Brisson ◽  
Fabien Cavalier ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Wave Bursts ◽  
Interferometric Detectors
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