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5 months ago in Physics , Quantum Gravity By Suresh
What are the conservation laws for spacetime and information?
We have conservation laws for energy and momentum. But what about spacetime itself? And information—is that conserved too?
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By Usha K Answered 1 month ago
In GR, local energy-momentum is conserved, but global energy in a curved expanding spacetime isn't always definable it's complicated. Information is a different story: in quantum mechanics, it's conserved via unitarity pure states stay pure. But black holes threw a wrench in that: if they evaporate, what happens to the information that fell in? That's the information paradox. The holographic principle suggests spacetime geometry itself might encode information, linking the two. So yes, spacetime and information are deeply connected—but we're still writing that chapter.
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