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Phys. Rev. Lett. 83, 670–673 (1999)

Constraining Dark Energy with Type Ia Supernovae and Large-Scale Structure

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Saul Perlmutter1, Michael S. Turner2a,2b,3, and Martin White4a,4b
1Institute for Nuclear and Particle Astrophysics, E.O. Lawrence Berkeley National Laboratory, Berkeley, California 94720
2aDepartments of Astronomy & Astrophysics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433
2band Department of Physics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433
3NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500
4aDepartment of Astronomy, University of Illinois at Urbana Champaign, Urbana, Illinois 61801
4band Department of Physics, University of Illinois at Urbana Champaign, Urbana, Illinois 61801

Received 15 January 1999; published in the issue dated 26 July 1999

See accompanying Physics Focus

Measurements of the distances to type Ia supernovae have produced strong evidence that the expansion of the Universe is accelerating, implying the existence of a nearly uniform component of dark energy with negative pressure. We show that constraints to this mysterious component based upon large-scale structure nicely complement the SN Ia data, and that together they require ΩX = ρX/ρcrit∈(0.6,0.7) and w = pX/ρX<-0.6 ( 95% C.L.), for the favored flat Universe. Other cosmological data support this conclusion. The simplest explanation, a cosmological constant, is consistent with this, while some of the other possibilities are not.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.670
DOI:
10.1103/PhysRevLett.83.670
PACS:
98.80.Es, 95.35.+d, 98.65.Dx, 98.70.Vc
 
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