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_papers/DeAmicis:2024eoy.md

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+---
+title: "Late-time tails in nonlinear evolutions of merging black holes"
+authors:
+  - "De Amicis, Marina"
+  - "Rüter, Hannes"
+  - "Carullo, Gregorio"
+  - "Albanesi, Simone"
+  - "Ferrus, C. Melize"
+  - "Mitman, Keefe"
+  - "Stein, Leo C."
+  - "Cardoso, Vitor"
+  - "Bernuzzi, Sebastiano"
+  - "Boyle, Michael"
+  - "Deppe, Nils"
+  - "Kidder, Lawrence E."
+  - "Moxon, Jordan"
+  - "Nagar, Alessandro"
+  - "Nelli, Kyle C."
+  - "Pfeiffer, Harald P."
+  - "Scheel, Mark A."
+  - "Throwe, William"
+  - "Vu, Nils L."
+  - "Zenginoğlu, Anıl"
+jref:
+doi:
+date: 2024-12-09
+arxiv: "2412.06887"
+abstract: |
+  We uncover late-time gravitational-wave tails in fully nonlinear 3+1
+  dimensional numerical relativity simulations of merging black holes,
+  using the highly accurate SpEC code. We achieve this result by
+  exploiting the strong magnification of late-time tails due to binary
+  eccentricity, recently observed in perturbative evolutions, and
+  showcase here the tail presence in head-on configurations for
+  several mass ratios close to unity. We validate the result through a
+  large battery of numerical tests and detailed comparison with
+  perturbative evolutions, which display striking agreement with full
+  nonlinear ones. Our results offer yet another confirmation of the
+  highly predictive power of black hole perturbation theory in the
+  presence of a source, even when applied to nonlinear solutions. The
+  late-time tail signal is much more prominent than anticipated until
+  recently, and possibly within reach of gravitational-wave detectors
+  measurements, unlocking observational investigations of an
+  additional set of general relativistic predictions on the long-range
+  gravitational dynamics.
+---

_papers/Ma:2024hzq.md

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+---
+title: "Merging black holes with Cauchy-characteristic matching: Computation of late-time tails"
+authors:
+  - "Ma, Sizheng"
+  - "Scheel, Mark A."
+  - "Moxon, Jordan"
+  - "Nelli, Kyle C."
+  - "Deppe, Nils"
+  - "Kidder, Lawrence E."
+  - "Throwe, William"
+  - "Vu, Nils L."
+jref:
+doi:
+date: 2024-12-09
+arxiv: "2412.06906"
+abstract: |
+  We present successful evolutions of binary black hole mergers using
+  a novel numerical-relativity technique known as Cauchy-
+  characteristic matching (CCM). This approach eliminates systematic
+  errors associated with boundary conditions, effectively extending
+  the computational domain to infinity. As an important application,
+  we use CCM to resolve a late-time power-law tail in the
+  gravitational wave from a head-on collision, and show that the tail
+  is highly suppressed in a quasi-circular binary. Our results for the
+  two extreme cases (orbital eccentricity $=0,1$) support the fact
+  that tails increase with orbital eccentricity. Therefore, CCM paves
+  the way for a detailed understanding of tails in eccentric systems.
+  For the head-on case, we find that the tail behavior is consistent
+  with predictions in the intermediate regime from black hole linear
+  perturbation theory. However, we also raise the possibility that the
+  power-law tail could be generated nonlinearly by quasinormal modes.
+  The nonlinear contribution is expected to decay slower than
+  predicted by Price's law, potentially dominating the signal at late
+  times. If confirmed as nonlinear, this would be an example where
+  nonlinearity prevails over linearity in the late-time regime of
+  black hole dynamics.
+---