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Extreme mass-ratio inspirals as probes of scalar fields: eccentric equatorial orbits around Kerr black holes

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arxiv 2203.05003 v2 pith:NQYICIUA submitted 2022-03-09 gr-qc astro-ph.HEhep-th

Susanna Barsanti , Nicola Franchini , Leonardo Gualtieri , Andrea Maselli , Thomas P. Sotiriou This is my paper · ORCID
classification gr-qcastro-ph.HEhep-th
keywords scalarblackmasschargedifferenteccentricequatorialevolution
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We study binary systems in which a stellar mass compact object spirals into a massive black hole, known as extreme mass ratio inspirals, in scenarios with a new fundamental scalar field. Earlier work has shown that, in most interesting such scenarios and to leading order in the mass ratio, the massive black holes can be adequately approximated by the Kerr metric and the imprint of the scalar field on the waveform is fully controlled by the scalar charge of the stellar mass object. Here we use this drastic simplification in the inspiral modelling and consider eccentric equatorial orbits. We study how the scalar charge affects the orbital evolution for different eccentricities and different values of the black hole spin. We then determine how changes in the orbital evolution get imprinted on the waveform and assess LISA's capability to detect or constrain the scalar charge.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The significance of first post-adiabatic contributions for scalar charge measurements with intermediate and extreme mass ratio inspirals

    gr-qc 2026-07 accept novelty 6.5 of 10

    Neglecting 1PA gravitational self-force biases intrinsic EMRI parameters while scalar-charge inference remains robust; pure-GR templates produce large biases and underestimated errors on charged signals.

  2. Probing time-dependent scalar wigs with extreme mass ratio inspirals

    gr-qc 2024-12 conditional novelty 6.0 of 10

    For EMRIs where the smaller black hole carries an oscillating scalar cloud with mass 0.001 <= mu_s m_p <= 0.02, the scalar energy flux is negligible, so the inspiral and gravitational waveform are essentially unchanged.

  3. Extreme mass-ratio inspirals and extra dimensions: Insights from modified Teukolsky framework

    gr-qc 2025-07 conditional novelty 5.0 of 10

    A modified Teukolsky equation and the Dudley-Finley approximation give nearly the same LISA detectability bound for the braneworld tidal charge, with MTE mismatches growing faster for high-eccentricity EMRIs.

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