The motion of galaxy clusters in inhomogeneous cosmologies
David Garfinkle
TL;DR
This paper investigates galaxy cluster velocities in inhomogeneous cosmological models, specifically Lemaitre-Tolman-Bondi spacetimes, and how these velocities vary with redshift, providing insights into their observational signatures.
Contribution
It provides a calculation of galaxy cluster velocities as a function of redshift within inhomogeneous cosmologies, linking theoretical models to observable effects.
Findings
Galaxy clusters can have large velocities relative to the CMB in these models.
Velocities vary significantly with redshift, affecting observational measurements.
The results help interpret the kinematic Sunyaev-Zeldovich effect in inhomogeneous universes.
Abstract
Lemaitre-Tolman-Bondi inhomogeneous spacetimes can be used as a cosmological model to account for the type Ia supernova data. However, such models also give rise to large velocities of galaxy clusters with respect to the cosmic microwave background. Those velocities can be measured using the kinematic Sunyaev-Zeldovich effect. This paper presents a calculation of galaxy cluster velocities as a function of redshift for such a model.
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