ar X iv : a st ro - p h / 05 10 82 5 v 2 1 M ar 2 00 7 Time Variation of the Fine Structure Constant in the Spacetime of a Cosmic Domain Wall
نویسندگان
چکیده
The gravitational field produced by a domain wall acts as a medium with spacetime-dependent permittivity ε. Therefore, the fine structure constant α = e 2 /4πε will be a time-dependent function at fixed position. The most stringent constraint on the time-variation of α comes from the natural reactor Oklo and gives | ˙ α/α| < f ew × 10 −17 yr −1. This limit constrains the tension of a cosmic domain wall to be less than σ 10 −2 MeV 3 , and then represents the most severe limit on the energy density of a cosmic wall stretching our Universe.
منابع مشابه
ar X iv : a st ro - p h / 05 10 82 5 v 1 2 9 O ct 2 00 5 Time Variation of the Fine Structure Constant in the Spacetime of a Cosmic Domain Wall
The gravitational field produced by a domain wall acts as a medium with spacetime-dependent permittivity ε. Therefore, the fine structure constant α = e 2 /4πε will be a time-dependent function at fixed position. The most stringent constraint on the time-variation of α comes from the natural reactor Oklo and gives | ˙ α/α| < f ew × 10 −17 yr −1. This limit constrains the tension of a cosmic dom...
متن کاملar X iv : a st ro - p h / 02 10 45 9 v 1 2 1 O ct 2 00 2 1 Temporal variation of coupling constants and nucleosynthesis
We investigate the triple-alpha process and the Oklo phenomenon to obtain constraints on possible cosmological time variations of fundamental constants. Specifically we study cosmological temporal constraints for the fine structure constant and nucleon and meson masses.
متن کاملar X iv : a st ro - p h / 05 05 55 5 v 1 2 7 M ay 2 00 5 Pulsars as Tools for Fundamental Physics & Astrophysics
X iv :a st ro -p h/ 05 05 55 5v 1 2 7 M ay 2 00 5 Pulsars as Tools for Fundamental Physics & Astrophysics J. M. Cordes, M. Kramer, T. J. W. Lazio , B. W. Stappers, D. C. Backer, S. Johnston Department of Astronomy and NAIC, Cornell University, Ithaca, NY USA University of Manchester, Jodrell Bank Observatory, Jodrell Bank, UK Naval Research Laboratory, Remote Sensing Division, Washington, DC US...
متن کاملar X iv : a st ro - p h / 97 09 22 7 v 1 2 4 Se p 19 97 Limits on the Variability of Physical Constants
We have compared the frequency of high-redshift Hydrogen HI 21 cm absorption with that of associated molecular absorption in two quasars to place new (1 sigma) upper limits on any variation in y ≡ gpα 2 (where α is the fine structure constant and gp is the proton g-factor) of ∆y/y < 5 × 10 −6 at redshifts z = 0.25 and z = 0.68.
متن کاملar X iv : a st ro - p h / 03 07 16 8 v 1 9 J ul 2 00 3 Aging of the Universe and the fine structure constant
In this paper the aging of the Universe is investigated in the frame of quantum hyperbolic heat transport equation. For the open universe, when t → ∞, ¯ h → ∞, c → 0 and fine structure constant, α, is constant. PACS98.80.Bp Origin and formations of the Universe PACS98.80Cq Particle-theory and field theory models of the early Universe (including cosmic pancakes, chaotic phenomena, inflationary u...
متن کامل