Quantifying the Scientific Potential of Intermediate and Extreme Mass Ratio Inspirals with the Laser Interferometer Space Antenna
Lorenzo Speri, Francisco Duque, Susanna Barsanti, Alessandro Santini, Shubham Kejriwal, Ollie Burke, Christian E. A. Chapman-Bird
arXiv:2603.17072v1 Announce Type: new
Abstract: The Laser Interferometer Space Antenna (LISA) will enable precision studies of Extreme and Intermediate Mass Ratio Inspirals (EMRIs/IMRIs), providing unique probes of astrophysical environments of galactic nuclei and strong-field gravity. Using a fully relativistic pipeline across primary masses $m_1 in [5times10^4, 10^7],M_odot$ and secondary masses $m_2 in [1, 10^4],M_odot$, we map instrumental performance directly to detection horizons and parameter measurement precision. EMRIs with $m_1 = 10^7,M_odot$ and $m_2 sim 1,M_odot$ are the most sensitive to instrument degradation, with redshift horizons at $z sim 0.01$, while IMRIs are the least sensitive to degradation and reach redshifts $z sim 1-3$. All prograde systems considered achieve sub-percent spin precision within three months of observation. The full 4.5-year mission increases the horizon of systems with $m_1 = 10^7,M_odot$ and $m_2 sim 1,M_odot$ by a factor of $sim 4$ and improves sky localization by one to two orders of magnitude reaching $ arXiv:2603.17072v1 Announce Type: new
Abstract: The Laser Interferometer Space Antenna (LISA) will enable precision studies of Extreme and Intermediate Mass Ratio Inspirals (EMRIs/IMRIs), providing unique probes of astrophysical environments of galactic nuclei and strong-field gravity. Using a fully relativistic pipeline across primary masses $m_1 in [5times10^4, 10^7],M_odot$ and secondary masses $m_2 in [1, 10^4],M_odot$, we map instrumental performance directly to detection horizons and parameter measurement precision. EMRIs with $m_1 = 10^7,M_odot$ and $m_2 sim 1,M_odot$ are the most sensitive to instrument degradation, with redshift horizons at $z sim 0.01$, while IMRIs are the least sensitive to degradation and reach redshifts $z sim 1-3$. All prograde systems considered achieve sub-percent spin precision within three months of observation. The full 4.5-year mission increases the horizon of systems with $m_1 = 10^7,M_odot$ and $m_2 sim 1,M_odot$ by a factor of $sim 4$ and improves sky localization by one to two orders of magnitude reaching $

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