On a sneezing universe
Andr\'e Tilquin, Thomas Schucker
TL;DR
This paper explores a quadratic equation of state in cosmology, fitting supernova data as well as LambdaCDM but limiting high-redshift objects, with modifications allowing higher redshifts.
Contribution
It introduces a quadratic equation of state model that matches supernova observations and discusses its limitations and potential extensions.
Findings
Quadratic equation of state fits supernova data as well as LambdaCDM.
The model restricts objects to redshifts below 1.7.
Adding cold baryons extends the maximum redshift without degrading the fit.
Abstract
A 1-parameter class of quadratic equations of state is confronted with the Hubble diagram of supernovae. The fit is found to be as good as the one using the standard LambdaCDM model. However this quadratic equation of state precludes objects with redshifts higher than z_max = 1.7. Adding a fair amount of cold baryons to the model increases z_max without spoiling the fit.
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Taxonomy
TopicsCosmology and Gravitation Theories · Black Holes and Theoretical Physics · Galaxies: Formation, Evolution, Phenomena