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Numerical relativity surrogate waveform models for exotic compact objects: The case of head-on mergers of equal-mass Proca stars

Raimon Luna1,*, Miquel Llorens-Monteagudo1, Ana Lorenzo-Medina2,†, Juan Calderón Bustillo2,3,‡, Nicolas Sanchis-Gual1, Alejandro Torres-Forné1,4, José A. Font1,4, Carlos A. R. Herdeiro5, and Eugen Radu5

  • *raimonluna@gmail.com
  • †analorenzo.medina@usc.es
  • ‡juan.calderon.bustillo@gmail.com
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Phys. Rev. D 110, 024004 – Published 16 July, 2024

DOI: https://doi.org/10.1103/PhysRevD.110.024004

Abstract

We present several high-accuracy surrogate models for gravitational-wave signals from equal-mass head-on mergers of Proca stars, computed through the Newman-Penrose scalar ψ4. We also discuss the current state of the model extensions to mergers of Proca stars with different masses, and the particular challenges that these present. The models are divided in two main categories: two-stage and monolithic. In the two-stage models, a dimensional reduction algorithm is applied to embed the data in a reduced feature space, which is then interpolated in terms of the physical parameters. For the monolithic models, a single neural network is trained to predict the waveform from the input physical parameter. Our model displays mismatches below 10−3 with respect to the original numerical waveforms. Finally, we demonstrate the usage of our model in full Bayesian parameter inference through the accurate recovery of numerical relativity signals injected in zero noise, together with the analysis of GW190521. For the latter, we observe excellent agreement with existing results that make use of full numerical relativity.

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Phys. Rev. D 110, 024004– Published 16 July, 2024
  • Received 6 April 2024
  • Accepted 5 June 2024
Article part of CHORUS
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