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  The butterfly effect in the extreme-mass ratio inspiral problem

Amaro-Seoane, P., Brem, P., Cuadra, J., & Armitage, P. J. (2012). The butterfly effect in the extreme-mass ratio inspiral problem. Astrophysical Journal, Letters, 744(2): L20. doi:10.1088/2041-8205/744/2/L20.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EACB-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EACC-5
Genre: Journal Article

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1108.5174 (Preprint), 369KB
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 Creators:
Amaro-Seoane, Pau1, Author              
Brem, Patrick, Author
Cuadra, Jorge, Author
Armitage, Philip J., Author
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24013              

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Free keywords: Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO, Astrophysics, Galaxy Astrophysics, astro-ph.GA,General Relativity and Quantum Cosmology, gr-qc
 Abstract: Measurements of gravitational waves from the inspiral of a stellar-mass compact object into a massive black hole are unique probes to test General Relativity (GR) and MBH properties, as well as the stellar distribution about these holes in galactic nuclei. Current data analysis techniques can provide us with parameter estimation with very narrow errors. However, an EMRI is not a two-body problem, since other stellar bodies orbiting nearby will influence the capture orbit. Any deviation from the isolated inspiral will induce a small, though observable deviation from the idealised waveform which could be misinterpreted as a failure of GR. Based on conservative analysis of mass segregation in a Milky Way like nucleus, we estimate that the possibility that another star has a semi-major axis comparable to that of the EMRI is non-negligible, although probably very small. This star introduces an observable perturbation in the orbit in the case in which we consider only loss of energy via gravitational radiation. When considering the two first-order non-dissipative post-Newtonian contributions (the periapsis shift of the orbit), the evolution of the orbital elements of the EMRI turns out to be chaotic in nature. The implications of this study are twofold. From the one side, the application to testing GR and measuring MBHs parameters with the detection of EMRIs in galactic nuclei with a millihertz mission will be even more challenging than believed. From the other side, this behaviour could in principle be used as a signature of mass segregation in galactic nuclei.

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 Dates: 2011-08-252011-12-142012
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: arXiv: 1108.5174
DOI: 10.1088/2041-8205/744/2/L20
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Title: Astrophysical Journal, Letters
  Other : ApJL
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 744 (2) Sequence Number: L20 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954922828215_1