# Supernova limits on the cosmic equation of state

@article{Garnavich1998SupernovaLO, title={Supernova limits on the cosmic equation of state}, author={Peter M. Garnavich and Saurabh W. Jha and Peter M. Challis and Alejandro Clocchiatti and Alan H. Diercks and Alexei V. Filippenko and Ronald L. Gilliland and Craig Hogan and R. P. Kirshner and Bruno Leibundgut and Mark M. Phillips and David J. Reiss and Adam G. Riess and B P Schmidt and Robert A. Schommer and R. C. Smith and Jason Spyromilio and Christopher W. Stubbs and Nicholas B. Suntzeff and John L. Tonry and S. M. Carroll CfA and Universidad Catolica and University of Washington and Ucb and Stsci and Eső and Ctio and Mssso and University of Michigan and University of Hawaii and Ucsb}, journal={The Astrophysical Journal}, year={1998}, volume={509}, pages={74-79} }

We use Type Ia supernovae studied by the High-z Supernova Search Team to constrain the properties of an energy component that may have contributed to accelerating the cosmic expansion. We find that for a flat geometry the equation-of-state parameter for the unknown component, αx = Px/ρx, must be less than -0.55 (95% confidence) for any value of Ωm, and it is further limited to αx < -0.60 (95% confidence) if Ωm is assumed to be greater than 0.1. These values are inconsistent with the unknown…

## 573 Citations

Constraining the equation of state of the Universe from distant Type Ia supernovae and cosmic microwave background anisotropies

- Physics
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- Physics
- 2007

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- Physics
- 2005

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- 2001

Observations of high-redshift supernovae imply an accelerating universe that can only be explained by an unusual energy component such as vacuum energy or quintessence. To assess the ability of…

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- 2001

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- 2001

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- 2003

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- 2003

Recent redshift-distance measurements of Type Ia supernovae (SNe Ia) at cosmological distances suggest that two-third of the energy density of the universe is dominated by dark energy component with…

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- 2005

The dark energy component of the Universe is often interpreted either in terms of a cosmological constant or as a scalar field. A generic feature of the scalar field models is that the equation of…

Stress testing the dark energy equation of state imprint on supernova data

- Physics, MathematicsPhysical Review D
- 2019

This work determines the degree to which a standard Lambda-CDM analysis based on type Ia supernovae can identify deviations from a cosmological constant in the form of a redshift-dependent dark…

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