Exact AdS and pp-waves in multi-gravity beyond pairwise interactions
Abstract
We construct exact anti-de Sitter (AdS) waves and pp-waves in ghost-free multi-gravity beyond pairwise interactions for an arbitrary number 𝒩 of vielbeins, in any spacetime dimension D≥3. Deforming proportional AdS and Minkowski solutions along a common null direction reduces the full nonlinear field equations to coupled linear differential equations for the wave profiles, without restricting their amplitudes. The system is diagonalised in the same eigenbasis as the perturbative Fierz-Pauli mass matrix, separating the solutions into one massless and 𝒩−1 massive eigenprofiles. We obtain explicit radial and transverse solutions and impose an AdS boundary falloff. This falloff admits the appropriate radial branch of every mode with non-negative squared mass and excludes profiles with negative squared masses, including logarithmic solutions at the Breitenlohner-Freedman threshold. We also relate the AdS waves to pp-waves through a local flat limit. Explicit examples exhibit wave configurations that cannot be reproduced by ghost-free pairwise theories, demonstrating that genuine multi-field interactions support new exact gravitational-wave solutions.
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BibTeX
@misc{flinckman2026exact,
title = {{Exact AdS and pp-waves in multi-gravity beyond pairwise interactions}},
author = {Joakim Flinckman},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.20839},
eprint = {2610.20839},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.20839},
}
RIS
TY - UNPB
TI - Exact AdS and pp-waves in multi-gravity beyond pairwise interactions
AU - Joakim Flinckman
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.20839
UR - https://arxiv.org/abs/2610.20839
AB - We construct exact anti-de Sitter (AdS) waves and pp-waves in ghost-free multi-gravity beyond pairwise interactions for an arbitrary number 𝒩 of vielbeins, in any spacetime dimension D≥3. Deforming proportional AdS and Minkowski solutions along a common null direction reduces the full nonlinear field equations to coupled linear differential equations for the wave profiles, without restricting their amplitudes. The system is diagonalised in the same eigenbasis as the perturbative Fierz-Pauli mass matrix, separating the solutions into one massless and 𝒩−1 massive eigenprofiles. We obtain explicit radial and transverse solutions and impose an AdS boundary falloff. This falloff admits the appropriate radial branch of every mode with non-negative squared mass and excludes profiles with negative squared masses, including logarithmic solutions at the Breitenlohner-Freedman threshold. We also relate the AdS waves to pp-waves through a local flat limit. Explicit examples exhibit wave configurations that cannot be reproduced by ghost-free pairwise theories, demonstrating that genuine multi-field interactions support new exact gravitational-wave solutions.
ER -