Nanohertz Gravitational Wave Astronomy during the SKA Era: An InPTA perspective

Joshi, B. C.; Gopakumar, A.; Pandian, Arul; Prabu, T.; Dey, Lankeswar; Bagchi, Manjari; Desai, S.; Tarafdar, Pratik; Rana, Prerna; Maan, Yogesh; Batra, Neelam Dhanda; Raghav, Girgaonkar,; Agarwal, Nikita; Arumugam, P.; Banik, Sarmistha; Basu, Avishek; Adarsh, Bathula,; Dandapat, Subhajit; Gupta, Yashwant; Hisano, Shinnosuke; Kato, Ryuichi; Kharbanda, Divyansh; Tomonosuke, Kikunaga,; Neel, Kolhe,; Krishnakumar, M. A.; Manoharan, P. K.; Marmat, Piyush; Naidu, Arun; K., Nobleson,; Kumar, Paladi, Avinash; Pathak, Dhruv; Singha, Jaikhomba; Srivastava, Aman; Surnis, Mayuresh; Susarla, Sai Chaitanya; Susobhanan, Abhimanyu; Takahashi, Keitaro

doi:10.48550/arxiv.2207.06461

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“…As did the cosmic microwave background, we anticipate pulsar timing array endeavor to also grow into a more mature science, able to make precise inferences about the physical nature of the sources of the stochastic gravitational wave background. The observation of about a thousand millisecond pulsars, as targeted in future pulsar timing array missions [33][34][35][36][37][38], should be able to improve the measurement uncertainties. Observations of pulsar pairs of subdegree separations in particular is something to look forward to as significant departures from the conservative Hellings-Downs correlation can be expected in this regime (forecasted in figure 2, section 4).…”

Section: Jcap11(2022)046 8 Discussionmentioning

confidence: 99%

Pulsar and cosmic variances of pulsar timing-array correlation measurements of the stochastic gravitational wave background

Bernardo

2022

J. Cosmol. Astropart. Phys.

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Pulsar timing-array correlation measurements offer an exciting opportunity to test the nature of gravity in the cosmologically novel nanohertz gravitational wave regime. The stochastic gravitational wave background is assumed Gaussian and random, while there are limited pulsar pairs in the sky. This brings theoretical uncertainties to the correlation measurements, namely the pulsar variance due to pulsar samplings and the cosmic variance due to Gaussian signals. We demonstrate a straightforward calculation of the mean and the variances on the Hellings-Downs correlation relying on a power spectrum formalism. We keep arbitrary pulsar distances and consider gravitational wave modes beyond Einstein gravity as well as off the light cone throughout, thereby presenting the most general and, most importantly, numerically efficient calculation of the variances.

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Section: Jcap11(2022)046 8 Discussionmentioning

confidence: 99%

Pulsar and cosmic variances of pulsar timing-array correlation measurements of the stochastic gravitational wave background

Bernardo

2022

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

Nanohertz Gravitational Wave Astronomy during the SKA Era: An InPTA perspective

Cited by 1 publication

References 0 publications

Pulsar and cosmic variances of pulsar timing-array correlation measurements of the stochastic gravitational wave background

Pulsar and cosmic variances of pulsar timing-array correlation measurements of the stochastic gravitational wave background

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