Gamma Rays May Signify Past Changes in Dark Energy |
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Written by spacetravel.org
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Sunday, 15 January 2006 20:39 |
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Astronomer Bradley Schaefer of Louisiana State University in Baton Rouge believes that observations of 52 gamma ray bursts (GRBs) suggest that dark energy has changed over time. Schaefer found that 12 of the most distant GRBs, which are nearly 13 billion light years away, were all brighter than expected, suggesting the universe was expanding at a slower rate than it is today.
Schaefer found that all 12 GRBs were brighter than would be predicted by a cosmological constant. He believes that rather than pushing space apart, dark energy was in fact drawing space together in the early Universe and seems to have changed over time.
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