Explanipedia

Waveform modelling for the Laser Interferometer Space Antenna Open

Niayesh Afshordi, Sarp Akçay, Sarp Akçay, Pau Amaro‐Seoane, Josu C. Aurrekoetxea , et al. · 2025

Gravitational-wave memory effects in the Damour-Esposito-Farèse extension of Brans-Dicke theory Open

Shammi Tahura, David A. Nichols, Kent Yagi · 2025

Gravitational-wave memory effects are lasting changes in the strain and its time integrals. They can be computed in asymptotically flat spacetimes using the conservation and evolution equations in the Bondi-Sachs framework. Modified theori…

POS0666 IMMUNE-TARGETED GLUCOCORTICOID ADC FOR THE TREATMENT OF AUTOIMMUNE AND INFLAMMATORY DISEASES Open

Jay L. Rothstein, Christian Carrière, Kimberly Bell, Margaret Day, Xin Huang , et al. · 2025

Probing dark-matter effects with gravitational waves using the parameterized post-Einsteinian framework Open

E. Wilcox, David A. Nichols, Kent Yagi · 2024

A massive black hole can develop a dark-matter overdensity, and the dark matter changes the evolution of a stellar-mass compact object inspiraling around the massive black hole through the dense dark-matter environment. Specifically, dynam…

Higher memory effects and the post-Newtonian calculation of their gravitational-wave signals Open

S Siddhant, Alexander M. Grant, David A. Nichols · 2024

A new hierarchy of lasting gravitational-wave effects (the higher memory effects) was recently identified in asymptotically flat spacetimes, with the better-known displacement, spin, and center-of-mass memory effects included as the lowest…

Exiles in the Old Northwest: How Northern Trans-Appalachia Became Midwestern Open

David A. Nichols · 2024

Frederick Jackson Turner, premier historian of the frontier and American exceptionalism, wondered late in his career how sectional identities had formed in the United States. Out of all the American sections, the Midwest seemed to have no …

Higher memory effects and the post-Newtonian calculation of their gravitational-wave signals Open

Siddhant Siddhant, Alexander M. Grant, David A. Nichols · 2024

A new hierarchy of lasting gravitational-wave effects (the higher memory effects) was recently identified in asymptotically flat spacetimes, with the better-known displacement, spin, and center-of-mass memory effects included as the lowest…

Fully nonlinear transformations of the Weyl-Bondi-Metzner-Sachs asymptotic symmetry group Open

Éanna É. Flanagan, David A. Nichols · 2024

A bstract The asymptotic symmetry group of general relativity in asymptotically flat spacetimes can be extended from the Bondi-Metzner-Sachs (BMS) group to the generalized BMS (GMBS) group suggested by Campiglia and Laddha, which includes …

Secondary accretion of dark matter in intermediate mass-ratio inspirals: Dark-matter dynamics and gravitational-wave phase Open

David A. Nichols, Benjamin A. Wade, Alexander M. Grant · 2023

When particle dark matter is bound gravitationally around a massive black hole in sufficiently high densities, the dark matter will affect the rate of inspiral of a secondary compact object that forms a binary with the massive black hole. …

Fully nonlinear transformations of the Weyl-Bondi-Metzner-Sachs asymptotic symmetry group Open

Éanna É. Flanagan, David A. Nichols · 2023

The asymptotic symmetry group of general relativity in asymptotically flat spacetimes can be extended from the Bondi-Metzner-Sachs (BMS) group to the generalized BMS (GMBS) group suggested by Campiglia and Laddha, which includes arbitrary …

Waveform Modelling for the Laser Interferometer Space Antenna Open

LISA Consortium Waveform Working Group, Niayesh Afshordi, Sarp Akçay, Pau Amaro‐Seoane, Andrea Antonelli , et al. · 2023

LISA, the Laser Interferometer Space Antenna, will usher in a new era in gravitational-wave astronomy. As the first anticipated space-based gravitational-wave detector, it will expand our view to the millihertz gravitational-wave sky, wher…

Erratum: Conserved charges of the extended Bondi-Metzner-Sachs algebra [Phys. Rev. D 95, 044002 (2017)] Open

Éanna É. Flanagan, David A. Nichols · 2023

Received 7 August 2023DOI:https://doi.org/10.1103/PhysRevD.108.069902© 2023 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasGeneral relativityGeneral relativity formalismPropertiesInfinite-dimensional symmetriesSpace…

Erratum: Outlook for detecting the gravitational-wave displacement and spin memory effects with current and future gravitational-wave detectors [Phys. Rev. D 107, 064056 (2023)] Open

Alexander M. Grant, David A. Nichols · 2023

Received 30 June 2023DOI:https://doi.org/10.1103/PhysRevD.108.029901© 2023 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasGeneral relativityGravitational wavesGravitation, Cosmology & Astrophysics

Erratum: Persistent gravitational wave observables: Curve deviation in asymptotically flat spacetimes [Phys. Rev. D 105, 024056 (2022)] Open

Alexander M. Grant, David A. Nichols · 2023

Received 2 May 2023DOI:https://doi.org/10.1103/PhysRevD.107.109902© 2023 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasGeneral relativity formalismGravitational wavesGravitation, Cosmology & Astrophysics

Outlook for detecting the gravitational wave displacement and spin memory effects with current and future gravitational wave detectors Open

Alexander M. Grant, David A. Nichols · 2022

Gravitational wave memory effects arise from non-oscillatory components of gravitational wave signals, and they are predictions of general relativity in the nonlinear regime that have close connections to the asymptotic properties of isola…

Telling Hoosier Stories: Promised Lands and Proving Grounds Open

David A. Nichols · 2022

Originally a living history museum celebrating Indiana’s homogeneous pioneer past, Conner Prairie began in the late 1990s to tell a more complicated story, one that included the expulsion of Native Americans and the enslavement of African …

New horizons for fundamental physics with LISA Open

K. G. Arun, Enis Belgacem, Robert Benkel, Laura Bernard, Emanuele Berti , et al. · 2022

Measuring the dark matter environments of black hole binaries with gravitational waves Open

Adam Coogan, Gianfranco Bertone, Daniele Gaggero, Bradley J. Kavanagh, David A. Nichols · 2022

Large dark matter overdensities can form around black holes of astrophysical\nand primordial origin as they form and grow. This "dark dress" inevitably\naffects the dynamical evolution of binary systems, and induces a dephasing in\nthe gra…

Persistent gravitational wave observables: Curve deviation in asymptotically flat spacetimes Open

Alexander M. Grant, David A. Nichols · 2022

In the first paper in this series, a class of observables that generalized the gravitational wave memory effect were introduced and given the name "persistent gravitational wave observables." These observables are all nonlocal in time, non…

Gravitational-wave memory effects in Brans-Dicke theory: Waveforms and effects in the post-Newtonian approximation Open

Shammi Tahura, David A. Nichols, Kent Yagi · 2021

Gravitational-wave (GW) memory effects produce permanent shifts in the GW strain and its time integrals after the passage of a burst of GWs. Their presence is closely tied to symmetries of asymptotically flat spacetimes and fluxes of conse…

Multi-messenger-Athena Synergy White Paper Open

L. Piro, M. Ahlers, A. Coleiro, M. Colpi, E. de Oña Wilhelmi , et al. · 2021

In this paper we explore the scientific synergies between Athena and some of the key multi-messenger facilities that should be operative concurrently with Athena. These facilities include LIGO A+, Advanced Virgo+ and future detectors for g…

Brans-Dicke theory in Bondi-Sachs form: Asymptotically flat solutions, asymptotic symmetries, and gravitational-wave memory effects Open

Shammi Tahura, David A. Nichols, Alexander Saffer, Leo C. Stein, Kent Yagi · 2021

Gravitational-wave memory effects are identified by their distinctive effects\non families of freely falling observers: after a burst of waves pass by their\nlocations, memory effects can cause lasting relative displacements of the\nobserv…

Classical and Quantized General-Relativistic Angular Momentum Open

Geoffrey Compère, David A. Nichols · 2021

Angular momentum at null infinity has a supertranslation ambiguity from the lack of a preferred Poincaré group and a similar ambiguity when the center-of-mass position changes as linear momentum is radiated. Recently, we noted there is an …

Detecting dark matter around black holes with gravitational waves: Effects of dark-matter dynamics on the gravitational waveform Open

Bradley J. Kavanagh, David A. Nichols, Gianfranco Bertone, Daniele Gaggero · 2020

\n Contains fulltext :\n 225232.pdf (Publisher’s version ) (Open Access)\n

Persistent gravitational wave observables: Nonlinear plane wave spacetimes Open

Éanna É. Flanagan, Alexander M. Grant, Abraham I. Harte, David A. Nichols · 2020

In the first paper in this series, we introduced "persistent gravitational\nwave observables" as a framework for generalizing the gravitational wave memory\neffect. These observables are nonlocal in time and nonzero in the presence of\ngra…

Forecasts for detecting the gravitational-wave memory effect with Advanced LIGO and Virgo Open

Oliver M. Boersma, David A. Nichols, P. Schmidt · 2020

This is a basic reproduction package for the paper "Forecasts for detecting the gravitational-wave memory effect with Advanced LIGO and Virgo".

LOFAR 144-MHz follow-up observations of GW170817 Open

J. W. Broderick, T. W. Shimwell, K. Gourdji, A. Rowlinson, S. Nissanke , et al. · 2020

We present low-radio-frequency follow-up observations of AT 2017gfo, the electromagnetic counterpart of GW170817, which was the first binary neutron star merger to be detected by Advanced LIGO–Virgo. These data, with a central frequency of…

Reproduction package for paper "Forecasts for detecting the gravitational-wave memory effect with Advanced LIGO and Virgo" Open

Oliver M. Boersma, David A. Nichols, P. Schmidt · 2020

This is a basic reproduction package for the paper "Forecasts for detecting the gravitational-wave memory effect with Advanced LIGO and Virgo".

Reproduction package for paper "Forecasts for detecting the gravitational-wave memory effect with Advanced LIGO and Virgo" Open

Oliver M. Boersma, David A. Nichols, P. Schmidt · 2020

This is a basic reproduction package for the paper "Forecasts for detecting the gravitational-wave memory effect with Advanced LIGO and Virgo".

Distinguishing the nature of comparable-mass neutron star binary systems with multimessenger observations: GW170817 case study Open

Tanja Hinderer, S. Nissanke, François Foucart, Kenta Hotokezaka, Trevor Vincent , et al. · 2019

The discovery of GW170817 with gravitational waves (GWs) and electromagnetic (EM) radiation is prompting new questions in strong-gravity astrophysics. Importantly, it remains unknown whether the progenitor of the merger comprised two neutr…

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