Is There an Unknown Source of Energy Contributing to Our Universe's Expansion?

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The discussion centers on the idea of an unknown energy source contributing to the universe's expansion. Participants argue against this notion, stating that the expansion is a natural outcome of the cosmological constant in Einstein's equations, which describes the properties of spacetime. They emphasize that energy cannot be created or destroyed, only converted, supporting the idea that no external energy input is necessary. The consensus is that all existing matter and energy in the universe are accounted for within current physical theories. Therefore, the hypothesis of an unknown energy source is deemed unnecessary and unsupported by established scientific principles.
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my friend tell me that there is a energy input from unknown system to our system. it can prove by constantly expand of my universe. is he correct?
 
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brucephy said:
my friend tell me that there is a energy input from unknown system to our system. it can prove by constantly expand of my universe. is he correct?

No. With a cosmological constant in Einstein's equation, expansion, and even accelerated expansion such as we see, is natural, an inner property of our spacetime. There is no reason to invoke an outside agency.
 
Its the basic conservation of energy theorum: energy can not be distroyed nor created, but it can be converted. :smile:

SelfAdjoint is also correct. There is another theorum another theorum that basically says matter can not be created or distroyed. So what we've got is all the matter we have.
 

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