---
_id: '17612'
abstract:
- lang: eng
  text: The gravitational waves (GWs) from a binary black hole with masses 10^4≲ M≲
    10^7M_⊙ can be detected with the Laser Interferometer Space Antenna (LISA) once
    their orbital frequency exceeds 10^{-4}-10^{-5} Hz. The binary separation at this
    stage is a=O(100)Rg (gravitational radius), and the orbital speed is v/c=O(0.1).
    I argue that at this stage, the binary will be producing bright electromagnetic
    (EM) radiation via gas bound to the individual BHs. Both BHs will have their own
    photospheres in X-ray and possibly also in optical bands. Relativistic Doppler
    modulations and lensing effects will inevitably imprint periodic variability in
    the EM light-curve, tracking the phase of the orbital motion, and serving as a
    template for the GW inspiral waveform. Advanced localization of the source by
    LISA weeks to months prior to merger will enable a measurement of this EM chirp
    by wide-field X-ray or optical instruments. A comparison of the phases of the
    GW and EM chirp signals will help break degeneracies between system parameters,
    and probe a fractional difference difference Δ v in the propagation speed of photons
    and gravitons as low as Δ v/c ≈ 10^{-17}.
alternative_title:
- A Phase Template for the Gravitational Wave Inspiral
article_processing_charge: No
article_type: original
author:
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
citation:
  ama: Haiman Z. The X-ray chirp of a compact black hole binary. <i>Foundations of
    Physics</i>. 2018;48(10):1430-1445. doi:<a href="https://doi.org/10.1007/s10701-018-0201-0">10.1007/s10701-018-0201-0</a>
  apa: Haiman, Z. (2018). The X-ray chirp of a compact black hole binary. <i>Foundations
    of Physics</i>. Springer Science and Business Media LLC. <a href="https://doi.org/10.1007/s10701-018-0201-0">https://doi.org/10.1007/s10701-018-0201-0</a>
  chicago: Haiman, Zoltán. “The X-Ray Chirp of a Compact Black Hole Binary.” <i>Foundations
    of Physics</i>. Springer Science and Business Media LLC, 2018. <a href="https://doi.org/10.1007/s10701-018-0201-0">https://doi.org/10.1007/s10701-018-0201-0</a>.
  ieee: Z. Haiman, “The X-ray chirp of a compact black hole binary,” <i>Foundations
    of Physics</i>, vol. 48, no. 10. Springer Science and Business Media LLC, pp.
    1430–1445, 2018.
  ista: Haiman Z. 2018. The X-ray chirp of a compact black hole binary. Foundations
    of Physics. 48(10), 1430–1445.
  mla: Haiman, Zoltán. “The X-Ray Chirp of a Compact Black Hole Binary.” <i>Foundations
    of Physics</i>, vol. 48, no. 10, Springer Science and Business Media LLC, 2018,
    pp. 1430–45, doi:<a href="https://doi.org/10.1007/s10701-018-0201-0">10.1007/s10701-018-0201-0</a>.
  short: Z. Haiman, Foundations of Physics 48 (2018) 1430–1445.
date_created: 2024-09-05T13:24:36Z
date_published: 2018-07-31T00:00:00Z
date_updated: 2024-09-24T07:28:50Z
day: '31'
doi: 10.1007/s10701-018-0201-0
extern: '1'
fulldoi: https://doi.org/10.1007/s10701-018-0201-0
intvolume: '        48'
issue: '10'
language:
- iso: eng
main_file_link:
- url: https://doi.org/10.1007/s10701-018-0201-0
month: '07'
oa_version: None
page: 1430-1445
publication: Foundations of Physics
publication_identifier:
  issn:
  - 0015-9018
  - 1572-9516
publication_status: published
publisher: Springer Science and Business Media LLC
quality_controlled: '1'
scopus_import: '1'
status: public
title: The X-ray chirp of a compact black hole binary
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 48
year: '2018'
...