Are our equations for this universe valid in all universes?

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SUMMARY

This discussion centers on the validity of our physical equations across potential multiverses. Participants argue that fundamental constants, such as electron mass and the fine structure constant, may vary in different universes, leading to distinct physical laws. The inability to observe other universes complicates the validation of these theories, as hypothetical variations could drastically alter the nature of existence. The consensus suggests that while our current universe's constants are stable, a multiverse with differing constants would present significant challenges for life and physics.

PREREQUISITES
  • Understanding of fundamental physical constants, such as the fine structure constant and gravitational constant.
  • Familiarity with multiverse theories and their implications in theoretical physics.
  • Basic knowledge of quantum mechanics and particle physics.
  • Awareness of the limitations of observational cosmology.
NEXT STEPS
  • Research the implications of varying physical constants in theoretical frameworks.
  • Explore different multiverse hypotheses, including the Many-Worlds Interpretation and String Theory.
  • Study the role of physical constants in the stability of our universe.
  • Investigate the philosophical implications of unobservable universes and their impact on scientific validation.
USEFUL FOR

This discussion is beneficial for theoretical physicists, cosmologists, and philosophers of science interested in the implications of multiverse theories and the nature of physical laws across different universes.

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If we live in a multiverse, are our equations about this universe valid in all universes?
 
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You marked this thread as level "A". What proposed multiverse hypotheses in the literature are you familiar with?
 
cosmicalset said:
If we live in a multiverse, are our equations about this universe valid in all universes?
I am not an expert on this but I think It will not be the valid. For example think electrons mass or protons, or fine structure constant. If these values were different then our physics rules would be different.

Another approach is to think that every universe can have its own mathematical structure (or physical). Since there are infinite universes why wouldn't it be different ?

https://arxiv.org/abs/1008.3907
 
Since hypothetical "other universes" outside of our universe are not observable, if I said they were full of green pixies riding pink unicorns, how could you prove me wrong?
 
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phyzguy said:
Since hypothetical "other universes" outside of our universe are not observable, if I said they were full of green pixies riding pink unicorns, how could you prove me wrong?
That's possible in our universe.
 
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There are some basic physical properties that, if varied, could significantly afftect the nature of any universe. For example, a change in the fine structure constant could really foul things up. Varying the gravitational constant would also be horribly disruptive affectng things like the mass, luminosity, llife expectancy and fate of stars to name a few. Fortunately, physical constants in this universe appear to be well behaved and stable. Life in a universe with variable physical constantss would likely face huge challemges and poor long term prospect. To date we have no evidence of 'other' universes - which would be difficult to explain assuming our present universe is infintie. A universe that is not infinite would also pose serious explanatory difficulties.
 
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