Searching for modified gravity in the astrophysical gravitational wave background: Application to ground-based interferometers

Author(s)

Nunes, Rafael C.

• Document type: Journal article
• Source: PHYSICAL REVIEW D; v. 102, n. 2, p. 9-pg., 2020-07-23.

Abstract

We investigate how the propagation of an astrophysical gravitational wave background (AGWB) is modified over cosmological volumes when considering theories beyond general relativity of the type Horndeski gravity. We first deduce an amplitude correction on the AGWB induced for the presence of a possible running in the Planck mass. Then, we apply the spectral noise density from some ground-based interferometers, namely, the Advanced LIGO (aLIGO), Einstein Telescope (ET) and Cosmic Explore (CE), to evaluate the signal-to-noise ratio as a function of the amplitude of the running of the Planck mass for two different scenarios. We find that for observation time period greater than or similar to 5 yrs and greater than or similar to 1 yr, we can have a significant signal of the AGWB in the band [1-100] Hz from the ET and CE sensitivity, respectively. Finally, using Fisher information, we find some forecast bounds, and we deduce less than or similar to 27% and less than or similar to 18% correction at 1 sigma confidence level on the amplitude of the running of the Planck mass from ET and CE, respectively. It is clear that a detection of a AGWB in the future can open a new window to probe the nature of gravity with good accuracy. (AU)

• FAPESP's process: 18/18036-5 - Investigating physical aspects beyond the standard model linked to the themes of dark energy, modified gravity, neutrinos and gravitational waves
• Grantee: Rafael da Costa Nunes
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/26258-4 - Superdense matter in the universe
• Grantee: Manuel Máximo Bastos Malheiro de Oliveira
• Support Opportunities: Research Projects - Thematic Grants