Is Energy Truly Conserved in an Expanding Universe?

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Energy appears to be lost in an expanding universe as it travels beyond our observable Hubble volume, never to return due to the limitations of light speed. This raises questions about the concept of a zero energy universe, suggesting it may have originated with negative energy that expanded faster than light, preventing cancellation with positive energy. The discussion emphasizes that while energy is conserved locally in General Relativity, its global conservation is not well-defined in a non-static metric. The threads, though seemingly similar, address different aspects of energy conservation related to the expansion of space and the universe's creation. Ultimately, the complexities of energy conservation in an expanding universe remain a significant topic of inquiry.
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I realized that if right now, energy is being lost forever by traveling across our Hubble volume. That energy will never reach us because no information can travel faster than c except the expansion of space. So in that sense, that energy is truly lost forever from our perspective. Maybe the zero energy universe was never really zero. Maybe it started off with negative energy expanding faster than c so it could never cancel out with the positive energy. Therefore, we have a universe with a positive amount of energy only because the negative energy traveled faster than c during inflation. What do you think?
 
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Why are you making two threads with almost the same topic at the same time?
 
DaleSpam said:
Why are you making two threads with almost the same topic at the same time?

They are not on the same topic, one is about how the expansion of space can support the contribute the conservation of energy and the other is about the creation of the universe idea of negative energy not being able to cancel out.
 
They are both questions on conservation of energy in the FLRW metric. They are essentially the same question and the answer is essentially the same: energy is conserved locally in GR, but in a non-static metric it is not even well defined globally.
 
Thread 'Is there a white hole inside every black hole?'

Thread 'Is there a white hole inside every black hole?'

This is what I am thinking. How much feasible is it? There is a white hole inside every black hole The white hole spits mass/energy out continuously The mass/energy that is spit out of a white hole drops back into it eventually. This is because of extreme space time curvature around the white hole Ironically this extreme space time curvature of the space around a white hole is caused by the huge mass/energy packed in the white hole Because of continuously spitting mass/energy which keeps...
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Thread 'Mechanism of Energy Conservation in Zero-Amplitude Sum of EM Waveforms'

Assume that this is a case where by sheer coincidence, two sources of coherent single-frequency EM wave pulses with equal duration are both fired in opposing directions, with both carrying the same frequency and amplitude and orientation. These two waves meet head-on while moving in opposing directions, and their phases are precisely offset by 180 degrees so that each trough of one wave meets with the crest of the other. This should be true for both the electric and magnetic components of...
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