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LET'S TALK ABOUT VARYING G.

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Title: LET'S TALK ABOUT VARYING G.
Authors: MOSS, ADAM1 adammoss@phas.ubc.ca, NARIMANI, ALI1 anariman@phas.ubc.ca, SCOTT, DOUGLAS1 dscott@phas.ubc.ca, Ahluwalia, D. V.
Source: International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology. Dec2010, Vol. 19 Issue 14, p2289-2294. 6p.
Subjects: Astronomical constants, Gravity, Strains & stresses (Mechanics), Protons, Mass transfer, Physics experiments
Abstract: It is possible that fundamental constants may not be constants at all. There is a generally accepted view that one can only talk about variations of dimensionless quantities, such as the fine structure constant αe ≡ e2/4πϵ0ℏc. However, constraints on the strength of gravity tend to focus on G itself, which is problematic. We stress that G needs to be multiplied by the square of a mass, and hence, for example, one should be constraining $\alpha_{{\rm g}}\equiv G m_{{\rm p}}^2/\hbar c$, where mp is the proton mass. Failure to focus on such dimensionless quantities makes it difficult to interpret the physical dependence of constraints on the variation of G in many published studies. A thought-experiment involving talking to observers in another universe about the values of physical constants may be useful for distinguishing what is genuinely measurable from what is merely part of our particular system of units. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: It is possible that fundamental constants may not be constants at all. There is a generally accepted view that one can only talk about variations of dimensionless quantities, such as the fine structure constant αe ≡ e2/4πϵ0ℏc. However, constraints on the strength of gravity tend to focus on G itself, which is problematic. We stress that G needs to be multiplied by the square of a mass, and hence, for example, one should be constraining $\alpha_{{\rm g}}\equiv G m_{{\rm p}}^2/\hbar c$, where mp is the proton mass. Failure to focus on such dimensionless quantities makes it difficult to interpret the physical dependence of constraints on the variation of G in many published studies. A thought-experiment involving talking to observers in another universe about the values of physical constants may be useful for distinguishing what is genuinely measurable from what is merely part of our particular system of units. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1142/S0218271810018396
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      – SubjectFull: Gravity
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      – SubjectFull: Strains & stresses (Mechanics)
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      – SubjectFull: Protons
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              Text: Dec2010
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