DARK ENERGY’S GROWTH PROBLEM.
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| Title: | DARK ENERGY’S GROWTH PROBLEM. |
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| Authors: | KAMIONKOWSKI, MARC (AUTHOR), RIESS, ADAM G. (AUTHOR) |
| Source: | Scientific American. Spring/Summer2026 Special, Vol. 35 Issue 2, p74-81. 8p. 3 Color Photographs, 4 Diagrams. |
| Subjects: | Dark energy, Hubble constant, Cosmic background radiation, Type I supernovae, Cepheids, Physical cosmology |
| Abstract: | The article focuses on the persistent discrepancy known as the "Hubble tension," where measurements of the universe’s expansion rate—the Hubble constant—differ significantly depending on the method used. Local measurements based on type Ia supernovae and Cepheid variable stars yield a value around 73 km/s/Mpc, while estimates derived from the cosmic microwave background (CMB) and the standard cosmological model predict a lower value near 67.5 km/s/Mpc. One proposed explanation is the existence of "early dark energy," a hypothetical form of energy present in the young universe that could have caused faster early expansion and subsequently decayed, potentially reconciling the conflicting measurements. Although early dark energy models have shown some promise in fitting observational data, recent high-resolution measurements have produced mixed results, and the tension remains unresolved, prompting ongoing research and new observational strategies. [Extracted from the article] |
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| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | The article focuses on the persistent discrepancy known as the "Hubble tension," where measurements of the universe’s expansion rate—the Hubble constant—differ significantly depending on the method used. Local measurements based on type Ia supernovae and Cepheid variable stars yield a value around 73 km/s/Mpc, while estimates derived from the cosmic microwave background (CMB) and the standard cosmological model predict a lower value near 67.5 km/s/Mpc. One proposed explanation is the existence of "early dark energy," a hypothetical form of energy present in the young universe that could have caused faster early expansion and subsequently decayed, potentially reconciling the conflicting measurements. Although early dark energy models have shown some promise in fitting observational data, recent high-resolution measurements have produced mixed results, and the tension remains unresolved, prompting ongoing research and new observational strategies. [Extracted from the article] |
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| ISSN: | 00368733 |
