Supernova Limits on the Cosmic Equation of State | Zendy

P. Garnavich | Zendy; Saurabh W. Jha | Zendy; Peter Challis | Zendy; A. Clocchiatti | Zendy; Alan H. Diercks | Zendy; A. V. Filippenko | Zendy; Ron Gilliland | Zendy; Craig J. Hogan | Zendy; R. Kirshner | Zendy; B. Leibundgut | Zendy; M. M. Phillips | Zendy; David J. Reiss | Zendy; Adam G. Riess | Zendy; B. Schmidt | Zendy; R. A. Schommer | Zendy; R. Chris Smith | Zendy; J. Spyromilio | Zendy; C. W. Stubbs | Zendy; N. B. Suntzeff | Zendy; J. Tonry | Zendy; Sean M. Carroll | Zendy

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Supernova Limits on the Cosmic Equation of State

Author(s) -

P. Garnavich,

Saurabh W. Jha,

Peter Challis,

A. Clocchiatti,

Alan H. Diercks,

A. V. Filippenko,

Ron Gilliland,

Craig J. Hogan,

R. Kirshner,

B. Leibundgut,

M. M. Phillips,

David J. Reiss,

Adam G. Riess,

B. Schmidt,

R. A. Schommer,

R. Chris Smith,

J. Spyromilio,

C. W. Stubbs,

N. B. Suntzeff,

J. Tonry,

Sean M. Carroll

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306495

Subject(s) - physics , cosmic microwave background , supernova , equation of state , dark energy , cosmological constant , cosmic cancer database , astrophysics , redshift , universe , shape of the universe , deceleration parameter , cosmic background radiation , cosmology , range (aeronautics) , metric expansion of space , scalar field , theoretical physics , mathematical physics , quantum mechanics , galaxy , materials science , composite material , anisotropy

We use Type Ia supernovae studied by the High-Z Supernova Search Team toconstrain the properties of an energy component which may have contributed toaccelerating the cosmic expansion. We find that for a flat geometry theequation of state parameter for the unknown component, alpha_x=P_x/rho_x, mustbe less than -0.55 (95% confidence) for any value of Omega_m and is furtherlimited to alpha_x<-0.60 (95%) if Omega_m is assumed to be greater than 0.1 .These values are inconsistent with the unknown component being topologicaldefects such as domain walls, strings, or textures. The supernova data areconsistent with a cosmological constant (alpha_x=-1) or a scalar field whichhas had, on average, an equation of state parameter similar to the cosmologicalconstant value of -1 over the redshift range of z=1 to the present. Supernovaand cosmic microwave background observations give complementary constraints onthe densities of matter and the unknown component. If only matter and vacuumenergy are considered, then the current combined data sets provide directevidence for a spatially flat Universe with Omega_tot=Omega_m+Omega_Lambda =0.94 +/- 0.26 (1-sigma).Comment: Accepted for publication in ApJ, 3 figure

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