What We Know About Dark Energy From Supernovae
Abstract
The measured distances of type Ia (white dwarf) supernovae as a function of redshift (z) have shown that the expansion of the Universe is currently accelerating, probably due to the presence of dark energy (X) having a negative pressure. Combining all of the data with existing results from large-scale structure surveys, we find a best fit for Omega M and Omega X of 0.28 and 0.72 (respectively), in excellent agreement with the values derived independently from WMAP measurements of the cosmic microwave background radiation. Thus far, the best-fit value for the dark energy equation-of-state parameter is -1, and its first derivative is consistent with zero, suggesting that the dark energy may indeed be Einstein's cosmological constant.
- Authors:
- Publication Date:
- Research Org.:
- FNAL (Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States))
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 987520
- DOE Contract Number:
- AC02-07CH11359
- Resource Type:
- Multimedia
- Resource Relation:
- Conference: Fermilab Colloquia, Fermi National Accelerator Laboratory (FNAL), Batvia, Illinois (United States), presented on May 21, 2008
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; SUPERNOVAE; COSMOLOGY; DARK ENERGY
Citation Formats
Filippenko, Alex. What We Know About Dark Energy From Supernovae. United States: N. p., 2008.
Web.
Filippenko, Alex. What We Know About Dark Energy From Supernovae. United States.
Filippenko, Alex. Wed .
"What We Know About Dark Energy From Supernovae". United States. https://www.osti.gov/servlets/purl/987520.
@article{osti_987520,
title = {What We Know About Dark Energy From Supernovae},
author = {Filippenko, Alex},
abstractNote = {The measured distances of type Ia (white dwarf) supernovae as a function of redshift (z) have shown that the expansion of the Universe is currently accelerating, probably due to the presence of dark energy (X) having a negative pressure. Combining all of the data with existing results from large-scale structure surveys, we find a best fit for Omega M and Omega X of 0.28 and 0.72 (respectively), in excellent agreement with the values derived independently from WMAP measurements of the cosmic microwave background radiation. Thus far, the best-fit value for the dark energy equation-of-state parameter is -1, and its first derivative is consistent with zero, suggesting that the dark energy may indeed be Einstein's cosmological constant.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 21 00:00:00 EDT 2008},
month = {Wed May 21 00:00:00 EDT 2008}
}