Peculiar motion relative to the cosmic rest frame can make a decelerating universe appear to accelerate, with a Doppler-like dipole in the deceleration parameter as the signature.
Tsagas, in proceedings of A Multipolar Universe , Thessaloniki, Greece, 2023 (Springer, Astrophysics and Space Science Proceedings, 2025) p
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Cosmic deceptions due to peculiar motions
Peculiar motion relative to the cosmic rest frame can make a decelerating universe appear to accelerate, with a Doppler-like dipole in the deceleration parameter as the signature.