PHYSICS: Changing Constants?
نویسندگان
چکیده
منابع مشابه
The Fundamental Constants in Physics
We discuss the fundamental constants of Physics in the Standard Model and possible changes of these constants on the cosmological time scale. The Grand Unification of the strong, electromagnetic and weak interactions implies relations between the time variation of the finestructure constant α and of the QCD scale Λc. A change of α by 10 −15 / year, as seen by an astrophysics experiment, implies...
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Various precision determinations of the Fermi constant are compared. Included are muon and (leptonic) tau decays as well as indirect prescriptions employing α, mZ , mW , sin θW (mZ)MS , Γ(Z → `+`−), and Γ(Z → νν̄) as input. Their good agreement tests the standard model at the ±0.1% level and provides stringent constraints on new physics. That utility is illustrated for: heavy neutrino mixing, 2 ...
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A natural system of fundamental physical units c, fi, and wp is discussed, where с is the velocity of light, a is Planck's constant, and mv is the Planck mass, which is related to the Newtonian gravitational constant by the equation m\ = fic/G. In a natural system of units, such questions as: "How does the anthropic nature of the physical universe arise? Is it unique, or does an infinite set of...
متن کاملChanging Electrical Constants of the Fundulus Egg Plasma Membrane
Electrical constants of the plasma membrane of the Fundulus egg have been measured with microelectrodes by the transient method. No consistent and significant membrane potential was measured. Membrane capacity averages 0.63 microF/cm.(2) for both unactivated and activated eggs. Membrane resistance averages 3450 ohm-cm.(2) in the unactivated eggs, but increases 2 to 7 times to an average of 13,2...
متن کاملThe Relation between Fundamental Constants and Particle Physics Parameters
The observed constraints on the variability of the proton to electron mass ratio μ and the fine structure constant α are used to establish constraints on the variability of the Quantum Chromodynamic Scale and a combination of the Higgs Vacuum Expectation Value and the Yukawa couplings. Further model dependent assumptions provide constraints on the Higgs VEV and the Yukawa couplings separately. ...
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ژورنال
عنوان ژورنال: Science
سال: 2004
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.305.5680.19b