| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Astrophysical Limits on the Evolution of Dimensionless Physical Constants over Cosmological Time | Lennox L. Cowie
; Antoinette Songaila
; | Date: |
16 Jul 1995 | Journal: | Astrophys.J. 453 (1995) 596-598 | Abstract: | We report new upper limits on any possible long-term time variation of the ratio of the electron to proton masses, $(m_e/m_p)$, the fine-structure constant, ($alpha$), and the quantity $alpha^2 g_p(m_e/m_p)$, where $g_p$ is the proton gyromagnetic ratio. These limits are based on extremely high precision observations of H$_2$, Si$^{3+}$, C$^0$ and H$^0$ in high-redshift quasar absorption lines. They amount to 95\% confidence ranges of $(-7.6 o 9.7) imes 10^{-14}$ yr$^{-1}$ for ($m_e/m_p$), $(-4.6 o 4.2) imes 10^{-14}$ yr$^{-1}$ for $alpha$ and $(-2.2 o 4.2) imes 10^{-15}$ yr$^{-1}$ for $alpha^2 g_p(m_e/m_p)$, where the elapsed time has been computed for a cosmology with hnought = 75 km s$^{-1}$ Mpc$^{-1}$ and qnought = 0.5. | Source: | arXiv, astro-ph/9507062 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |