Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 3643
Articles: 2'488'730
Articles rated: 2609

29 March 2024
 
  » arxiv » astro-ph/9507062

 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
AbstractWe 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   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  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






ScienXe.org
» my Online CV
» Free


News, job offers and information for researchers and scientists:
home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2024 - Scimetrica