Pulsar timing and the upper limits on a gravitational wave background: A Bayesian approach

1996 ◽  
Vol 54 (10) ◽  
pp. 5993-6000 ◽  
Author(s):  
M. P. McHugh ◽  
G. Zalamansky ◽  
F. Vernotte ◽  
E. Lantz
Keyword(s):  
Gravitational Wave ◽  
Bayesian Approach ◽  
Pulsar Timing ◽  
Upper Limits ◽  
Gravitational Wave Background

scholarly journals Implications of the NANOGrav results for inflation

2020 ◽  
Author(s):  
Sunny Vagnozzi
Keyword(s):  
Gravitational Wave ◽  
Spectral Index ◽  
Power Law ◽  
Big Bang ◽  
Big Bang Nucleosynthesis ◽  
Pulsar Timing ◽  
Upper Limits ◽  
Gravitational Wave Background ◽  
Pulsar Timing Array ◽  
O 10

Abstract The NANOGrav pulsar timing array experiment reported evidence for a stochastic common-spectrum process affecting pulsar timing residuals in its 12.5-year dataset, which might be interpreted as the first detection of a stochastic gravitational wave background (SGWB). I examine whether the NANOGrav signal might be explained by an inflationary SGWB, focusing on the implications for the tensor spectral index nT and the tensor-to-scalar ratio r. Explaining NANOGrav while complying with upper limits on r from BICEP2/Keck Array and Planck requires $r \gtrsim {\cal O}(10^{-6})$ in conjunction with an extremely blue tensor spectrum, 0.7 ≲ nT ≲ 1.3. After discussing models which can realize such a blue spectrum, I show that this region of parameter space can be brought in agreement with Big Bang Nucleosynthesis constraints for a sufficiently low reheating scale, Trh ≲ 100 GeV − 1 TeV. With the important caveat of having assumed a power-law parametrization for the primordial tensor spectrum, an inflationary interpretation of the NANOGrav signal is therefore not excluded.

scholarly journals Searching for gravitational-wave bursts from cosmic string cusps with the Parkes Pulsar Timing Array

2020 ◽  
Vol 501 (1) ◽  
pp. 701-712
Author(s):  
N Yonemaru ◽  
S Kuroyanagi ◽  
G Hobbs ◽  
K Takahashi ◽  
X-J Zhu ◽  
...  
Keyword(s):  
False Alarm ◽  
Gravitational Wave ◽  
Cosmic String ◽  
Cosmic Strings ◽  
False Alarm Probability ◽  
String Tension ◽  
Detection Algorithm ◽  
Pulsar Timing ◽  
Upper Limits ◽  
Pulsar Timing Array

ABSTRACT Cosmic strings are potential gravitational-wave (GW) sources that can be probed by pulsar timing arrays (PTAs). In this work we develop a detection algorithm for a GW burst from a cusp on a cosmic string, and apply it to Parkes PTA data. We find four events with a false alarm probability less than 1 per cent. However further investigation shows that all of these are likely to be spurious. As there are no convincing detections we place upper limits on the GW amplitude for different event durations. From these bounds we place limits on the cosmic string tension of Gμ ∼ 10−5, and highlight that this bound is independent from those obtained using other techniques. We discuss the physical implications of our results and the prospect of probing cosmic strings in the era of Square Kilometre Array.

scholarly journals Erratum: Placing limits on the stochastic gravitational-wave background using European Pulsar Timing Array data

2012 ◽  
Vol 425 (2) ◽  
pp. 1597-1597 ◽  
Author(s):  
R. van Haasteren ◽  
Y. Levin ◽  
G. H. Janssen ◽  
K. Lazaridis ◽  
M. Kramer ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Array Data ◽  
Pulsar Timing ◽  
Gravitational Wave Background ◽  
Pulsar Timing Array

scholarly journals PULSAR TIMING ARRAYS

2013 ◽  
Vol 22 (01) ◽  
pp. 1341008 ◽  
Author(s):  
BHAL CHANDRA JOSHI
Keyword(s):  
Gravitational Wave ◽  
Gravitational Waves ◽  
Low Frequency ◽  
Radio Pulsars ◽  
Very Low Frequency ◽  
Pulsar Timing ◽  
Gravitational Wave Background ◽  
Pulsar Timing Array ◽  
Current Operating

In the last decade, the use of an ensemble of radio pulsars to constrain the characteristic strain caused by a stochastic gravitational wave background has advanced the cause of detection of very low frequency gravitational waves (GWs) significantly. This electromagnetic means of GW detection, called Pulsar Timing Array (PTA), is reviewed in this paper. The principle of operation of PTA, the current operating PTAs and their status are presented along with a discussion of the main challenges in the detection of GWs using PTA.

Stochastic Gravitational Wave Background: Upper Limits in the 10−6to 10−3Hz Band

2003 ◽  
Vol 599 (2) ◽  
pp. 806-813 ◽  
Author(s):  
J. W. Armstrong ◽  
L. Iess ◽  
P. Tortora ◽  
B. Bertotti
Keyword(s):  
Gravitational Wave ◽  
Upper Limits ◽  
Gravitational Wave Background

scholarly journals On detection of the stochastic gravitational-wave background using the Parkes pulsar timing array

2011 ◽  
Vol 414 (2) ◽  
pp. 1777-1787 ◽  
Author(s):  
D. R. B. Yardley ◽  
W. A. Coles ◽  
G. B. Hobbs ◽  
J. P. W. Verbiest ◽  
R. N. Manchester ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Pulsar Timing ◽  
Gravitational Wave Background ◽  
Pulsar Timing Array
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