Constraints on temporal variation of fundamental constants from GRBs
نویسندگان
چکیده
منابع مشابه
Comment on the Variation of Fundamental Constants
It is argued by Duff that only the time variation of dimensionless constants of nature is a legitimate subject of enquiry, and that dimensional constants such as c, h̄,G... are merely human constructs whose value has no operational meaning. We refute this claim and point out that such varying dimensional “constants” can have significant physical consequences for the universe that can be directly...
متن کاملBlack hole constraints on varying fundamental constants.
We apply the generalized second law of thermodynamics and derive upper limits on the variation in the fundamental constants. The maximum variation in the electronic charge permitted for black holes accreting and emitting in the present cosmic microwave background corresponds to a variation in the fine-structure constant of Deltaalpha/alpha approximately 2 x 10(-23) per second. This value matche...
متن کاملComment on "Black hole constraints on varying fundamental constants".
In the Letter [1] (also [2]) there is a claim that the generalised second law of thermodynamics (entropy increase) for black holes provides some limits on the rate of variation of the fundamental constants of nature (electric charge e, speed of light c, etc.). We have come to a different conclusion. The results in [1, 2] are based on assumption that mass of a black hole does not change without ...
متن کامل3 Astrophysical constraints on hypothetical variability of fundamental constants
Many-multiplet (MM) method [1] applied to three inhomogeneous samples of Keck/HIRES quasar absorption spectra gives a shift in the value of the fine-structure constant of ∆α/α = (−5.4± 1.2)× 10−6 in the redshift range 0.2 < z < 3.7 [2]. The 1 σ error claimed in [2] is, however, much too small and cannot be maintained by current observations of quasars. We present a modified MM method to set an ...
متن کاملAstrophysical constraints on hypothetical variability of fundamental constants
Many-multiplet (MM) method [1] applied to Keck/HIRES quasar absorption spectra gives a shift in the value of the fine-structure constant of ∆α/α = (−5.4±1.2)×10−6 [2]. Theoretical models of the fundamental physical interactions predict in this case a shift in the protonto-electron mass ratio (μ = mp/me) of about ∆μ/μ ∼ −2× 10−4. We used VLT/UVES high-resolution observations of molecular hydroge...
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ژورنال
عنوان ژورنال: Astroparticle Physics
سال: 2008
ISSN: 0927-6505
DOI: 10.1016/j.astropartphys.2008.02.001