Testing No slip model with pulsar timing arrays: NANOGrav and IPTA

Autor:	Davari, Mohammadreza, Allahyari, Alireza, Khosravi, Shahram
Rok vydání:	2024
Předmět:	General Relativity and Quantum Cosmology Astrophysics - Cosmology and Nongalactic Astrophysics Astrophysics - High Energy Astrophysical Phenomena
Druh dokumentu:	Working Paper
Popis:	We perform an observational study of modified gravity considering a potential inflationary interpretation of pulsar timing arrays (PTA). We use a motivated model known as no slip in which the gravitational wave propagation is modified. Specifically, by using two different parametrizations for the model, we find the approximate transfer functions for tensor perturbations. In this way, we obtain the spectral energy density of gravitational waves and use NANOGrav and IPTA second data release to constrain parameters of the model. We find that there is degeneracy between the model parameters $\xi$ and $c_M$. For $c_M$, we only get an upper bound on the parameter. Thus, it is difficult to constrain them with percent level accuracy with the current PTA data. Comment: 18 pages, 5 figures, 2 tables
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2409.05956 Zobrazit plný text záznamu View this record from Arxiv