## Abstract

Principal component analysis (PCA) is an efficient tool to optimize multiparameter tests of general relativity (GR), wherein one looks for simultaneous deviations in multiple post-Newtonian phasing coefficients. This is accomplished by introducing non-GR deformation parameters in the phase evolution of the gravitational-wave templates used in the analysis. A PCA is performed to construct the "best-measured"linear combinations of the deformation parameters. This helps to set stringent limits on deviations from GR and to more readily detect possible beyond-GR physics. In this paper, we study the effectiveness of this method with the proposed next-generation gravitational-wave detectors, Cosmic Explorer (CE) and Einstein Telescope (ET). For compact binaries at a luminosity distance of 500 Mpc and the detector-frame total mass in the range 20-200M, CE can measure the most dominant linear combination with a 1-σ uncertainty ∼0.1% and the next two subdominant linear combinations with a 1-σ uncertainty of ≤10%. For a specific range of masses, constraints from ET are better by a factor of a few than CE. This improvement is because of the improved low frequency sensitivity of ET compared to CE (between 1-7 Hz). In addition, we explain the sensitivity of the PCA parameters to the different post-Newtonian deformation parameters and discuss their variation with total mass. We also discuss a criterion for quantifying the number of most dominant linear combinations that capture the information in the signal up to a threshold.

Original language | English (US) |
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Article number | 044036 |

Journal | Physical Review D |

Volume | 109 |

Issue number | 4 |

DOIs | |

State | Published - Feb 15 2024 |

## All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics