Time, energy, information constants

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Discussion Overview

The discussion revolves around the concepts of energy, matter, time, and information in the context of the universe since the Big Bang. Participants explore whether these quantities have remained constant and how they might be interconnected within a theoretical framework.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant suggests that all energy and matter in the universe has been constant since the Big Bang and questions if time and information can also be considered constant.
  • Another participant agrees that energy and matter have not been observed to violate conservation laws but expresses uncertainty about the meaning of time being constant, noting that time continues to pass.
  • A different viewpoint is presented, stating that the total energy may actually be increasing due to the constant density of dark energy as space expands.
  • One participant points out that in curved spacetimes, there is no general global definition of energy, complicating the assertion of constancy since the Big Bang.
  • There is a mention that the universe does not have a perimeter according to General Relativity, which is the underlying theory of modern cosmology.

Areas of Agreement / Disagreement

Participants express differing views on the constancy of energy, matter, time, and information, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

Limitations include the lack of consensus on the definitions of energy and time in curved spacetimes, as well as the implications of dark energy on total energy in the universe.

jgreene
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hello, I'm not a physicist, just a goofy gent with some far fetched ideas

is it safe to say that all the energy and matter in the universe has been constant since big bang?

would it be ok to assume that all the time and information has also been constant since the big bang?

Been thinking about the creation and destruction of information and have concluded that the total amount of information in the universe never changes, is that goofy?

Same goes for time, all the time that was and will be was created in the big bang as well.

what defines the perimeter of the universe, time, information or energy, or can all of these be tied together with an underlying theory?
 
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So far, no one has witnessed an event in which the law of conservation of energy was "disobeyed", so I say that yes - it is safe to say that the energy and matter has been constant so far. However, I don't know exactly what you mean by time being constant. Time keeps passing.

cb
 
The total energy may be increasing. Dark energy density seems to be constant - thereful total dark energy increases with increasing volume of space.
 
jgreene said:
is it safe to say that all the energy and matter in the universe has been constant since big bang?
Unfortunately, in curved spacetimes there is no general global definition of energy. Here are a couple of nice FAQs on the topic:

http://math.ucr.edu/home/baez/physics/Relativity/GR/energy_gr.html
https://www.physicsforums.com/showthread.php?t=506985

jgreene said:
what defines the perimeter of the universe, time, information or energy, or can all of these be tied together with an underlying theory?
The theory that underlies modern cosmology is GR. In that theory the universe does not have a perimeter.
 

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