Is the Proton-to-Electron Mass Ratio Really Changing?

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Discussion Overview

The discussion centers on the potential variability of the proton-to-electron mass ratio, particularly in light of recent claims suggesting changes based on spectral comparisons between laboratory measurements and observations from distant quasars. Participants explore the implications of such a change and the validity of the claims presented in the referenced article.

Discussion Character

  • Debate/contested
  • Exploratory
  • Technical explanation

Main Points Raised

  • Some participants express skepticism about the claims of a changing proton-to-electron mass ratio, suggesting that independent verification through different methods is necessary for credibility.
  • One participant emphasizes the importance of dimensionless constants in physics, arguing that changes in ratios of like-dimensioned quantities are more meaningful than changes in individual dimensionful components.
  • Another participant highlights the significance of the inquiry into the proton-to-electron mass ratio as a meaningful issue within the context of fundamental physics.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the validity of the claims regarding the changing proton-to-electron mass ratio, with multiple competing views remaining regarding the interpretation and implications of the findings.

Contextual Notes

The discussion reflects a reliance on specific measurement methods and the interpretation of dimensionless versus dimensionful quantities, which may affect the understanding of the claims made.

simon009988
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There was a recent article in nature on how there was "INDICATIONS OF A CHANGE IN THE PROTON-TO-ELECTRON MASS RATIO have shown up in comparisons of the spectra of hydrogen gas as recorded in a lab with spectra of light coming from hydrogen clouds at the distance of quasars. "


I was just wondering how ture people think this is.
Could this constant really be changing?
 
Physics news on Phys.org
Better with a reference : http://Newton.ex.ac.uk/aip/physnews.774.html
 
Last edited by a moderator:
As with the purported claim of the changing fine structure constant with time, these things need to be verified independently using a different method to be convincing.

Zz.
 
and, to repeat from older threads, it is these dimensionless "constants" that count. if [itex]m_e/m_p[/itex] changes or if [itex]\alpha[/itex] changes, that means something. claims made about a changing [itex]c[/itex] or [itex]G[/itex] are meaningless. we can only measure these quantities against like dimensioned standards (like a carpenter measuring length with a tape-measure) and we measure or ultiimately sense only dimensionless quanitities. if something has noticeably changed, it was a ratio of like dimensioned quantities and to blame that change on any single dimesionful component (like blaming it on [itex]m_p[/itex]) is misleading.

so at least the OP is inquiring about a meaningful issues.
 
Last edited:

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