Detecting the Stochastic Gravitational Wave Background from Massive Gravity with Pulsar Timing Arrays

Liang, Qiuyue; Trodden, Mark

doi:10.48550/arxiv.2108.05344

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…In addition to SMBHBs and cosmic strings, there might be other sources of a commonspectrum process, which are worth considering. Some of the most suggestive and physically impactful, if confirmed, are inflation and reheating [61], BBHs from the previous aeon merged during the Big Crunch [62,63] in cyclic conformal cosmological models of the Universe [64], massive gravity [65], and axion-like particles [66]. In particular, a GWB produced by quantum fluctuations of the gravitational field during the inflationary epoch is actually predicted within the context of the standard cosmological model Λ-Cold Dark Matter (ΛCDM), so its discovery would be crucial for probing the evolution of the Universe.…”

Section: Current Resultsmentioning

confidence: 99%

Principles of Gravitational-Wave Detection with Pulsar Timing Arrays

2021

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Pulsar timing uses the highly stable pulsar spin period to investigate many astrophysical topics. In particular, pulsar timing arrays make use of a set of extremely well-timed pulsars and their time correlations as a challenging detector of gravitational waves. It turns out that pulsar timing arrays are particularly sensitive to ultra-low-frequency gravitational waves, which makes them complementary to other gravitational-wave detectors. Here, we summarize the basics, focusing especially on supermassive black-hole binaries and cosmic strings, which have the potential to form a stochastic gravitational-wave background in the pulsar timing array detection band, and the scientific goals on this challenging topic. We also briefly outline the recent interesting results of the main pulsar timing array collaborations, which have found strong evidence of a common-spectrum process compatible with a stochastic gravitational-wave background and mention some new perspectives that are particularly interesting in view of the forthcoming radio observatories such as the Five hundred-meter Aperture Spherical Telescope, the MeerKAT telescope, and the Square Kilometer Array.

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Section: Current Resultsmentioning

confidence: 99%

Principles of Gravitational-Wave Detection with Pulsar Timing Arrays

2021

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“…However, the true nature of this signal is unclear, so other interpretations (see, e.g., ref. [12][13][14]) are still viable. For this reason, it has not been possible to claim the GWB detection yet.…”

Section: Introductionmentioning

confidence: 99%

Including Millisecond Pulsars inside the Core of Globular Clusters in Pulsar Timing Arrays

Maiorano¹,

Paolis²,

Nucita³

2021

Preprint

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We suggest the possibility of including millisecond pulsars inside the core of globular clusters in pulsar timing array experiments. Since they are very close to each other, their gravitational wave induced timing residuals are expected to be almost the same, because both the Earth and the pulsar terms are correlated. We simulate the expected timing residuals, due to the gravitational wave signal emitted by a uniform supermassive black-hole binary population, on the millisecond pulsars inside a globular cluster core. In this respect, Terzan 5 has been adopted as a globular cluster prototype and, in our simulations, we adopted similar distance, core radius, and number of millisecond pulsars contained in it. Our results show that the presence of a strong correlation between the timing residuals of the globular cluster core millisecond pulsars can provide a remarkable gravitational wave signature. This result can be therefore exploited for the detection of gravitational waves through pulsar timing, especially in conjunction with the standard cross-correlation search carried out by the pulsar timing array collaborations.

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Detecting the Stochastic Gravitational Wave Background from Massive Gravity with Pulsar Timing Arrays

Cited by 2 publications

References 17 publications

Principles of Gravitational-Wave Detection with Pulsar Timing Arrays

Principles of Gravitational-Wave Detection with Pulsar Timing Arrays

Including Millisecond Pulsars inside the Core of Globular Clusters in Pulsar Timing Arrays

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