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This might be one of the worst, least-descriptive titles I’ve ever seen
I generally always have an issue with headlines that say something could happen, too.
“New research could bring about the total destruction of earth.” Could have been a headline talking about the LHC making microscopic black holes.
Steffen Gielen, Lucía Menéndez-Pidal.
Black Hole Singularity Resolution in Unimodular Gravity from Unitarity
Physical Review Letters, 2025; 134 (10)
DOI: 10.1103/PhysRevLett.134.101501i can’t even understand the very beginning of the discussion : why are physicists so obsessed with “information loss” ?
It has long been stated that a quantum theory of black hole dynamics that is required to be unitary must deviate strongly from semiclassical expectations. Usually this is discussed in the context of unitarity of black hole formation and evaporation, leading to the famous issue of information loss.[24]*
[24]* : S. W. Hawking, Breakdown of predictability in gravitational collapse
Phys. Rev. D 14, 2460 (1976).To oversimplify, “information” is a very specific thing in quantum physics. Classical physics has the rule that energy can change form but cannot either be created or destroyed.
Information works the same way in quantum physics, which makes black holes seem like a problem since their event horizons are inescapable and anything that falls inside is lost.
why’s it a problem? why can’t information just be lost at a black hole?
The problem is that it’d be like if matter and energy could just disappear. Black holes would be exclusively tiny, as soon as one formed it’d start vanishing anything that crossed it’s event horizon rather than growing, so galaxies could never have formed as their cores would just shrink away as soon as they got too dense.
Black holes are regions of space where information density hits the upper limits allowed by physics. Add more information to it, and the event horizon expands proportionally to what was added. With that in hindsight, it seems rather obvious that the boundary of the event horizon could encode the information once thought to be lost to the black hole inside.
It could do that but what’s the evidence that it does? Or has someone proved this is already a feature of semi-classical gravity that just wasn’t noticed before? Or is it only a feature of a brand new hypothetical theory?
The other alternative is that the quantum information is somehow converted to some value of the black hole’s measurable properties; charge, mass, and spin. We know that isn’t the case because the values for these that we can infer from observation are consistent rather than growing faster than expected.
I still don’t really understand why the information just can’t be destroyed. It seems like we’re starting from an assumption that it shouldn’t be destroyed despite it being so in semi-classical gravity, and then trying to think of alternative theories which could preserve it such as on the boundary or in its charge/mass/spin. Maybe that’s correct but it seems like speculation, and it’s not speculation based on any actual contradiction between theory and practice, i.e. not because semi-classical gravity has actually made an incorrect prediction in an experiment we can go out and verify, but only because we have certain preconceptions as to how nature should work which aren’t compatible with it. So it doesn’t really come across to me as a scientific “problem” but more of a metaphysical one.
It’s fundamentally a product of one of our most basic assumptions, that the laws of physics don’t change.
When the laws of physics don’t change, symmetries arise in the math used to describe them, and each of these invariant symmetries corresponds to a law of conservation we can observe experimentally and an aspect of the universe it renders un-measurable.
Conservation of Momentum is a space-translation symmetry which makes it so that absolute position is unmeasurable, we can only tell where we are in relation to other things. Conservation of angular momentum is a rotation symmetry that does the same thing for direction. There’s no “center” to the universe and no “up” or “down” without something to stand on for context, and no experiment we could possibly design can prove otherwise.
Conservation of energy (and therefore mass) arises out of time-translation symmetries. There’s no way we can distinguish a particular moment in time from any other without setting a relative “time zero” for comparison, and no possible clock we can build that could be 100% accurate. We have to account for the different rate of time in the atomic clocks in our GPS satellites due to their relative velocity to us on the ground, but the lack of absolute time precision means it can only ever provide an estimate with some range of error.
Exactly how the relativity of spacetime implies a universe with conservation of information would require a lot of math, and a new description of spacetime that breaks these conservation laws would have to explain why it “seems to” adhere to them in all the ways we’ve tested our reality so far.
Thanks, your explanation is interesting and makes sense at my level of abstraction.
Eventually i would like it, if some physicist could come up with a cosmology where energy could be created and entropy of a close system could decrease … in specific conditions and in our present day universe.
Also, in my naive understanding, chaotic pendulums creates information.
Also: The Lagrangian mathematics they use for quantum physics can be used to describe universes like the one you talk about, and if you’re interested in things like that then I absolutely have to recommend some novels by the mathematician and science fiction author Greg Egan. It’s way easier to start grasping how weird the physics can get when you get a story from the perspective of people who live there:
The Orthogonal Trilogy (2011-2013) is set in a 4d universe where the passage of time is dependent on the direction of travel in space, about a generation ship launched on an anti-timewise loop back around to the near future to develop a solution to an impending apocalyptic crisis of energy creation at the quantum scale.
Dichronauts (2017) is a journey to the end of the world in a universe where time has two dimensions and life evolved as a symbiosis of two creatures that could each experience only one direction in time.
Schild’s Ladder (2002) is set in a distant future where an experiment gone awry creates a more stable form of vacuum, creating an event horizon that expands at half the speed of light. 600 years later, a ship studying the event horizon discovers that the complex geometry of the new space behind it harbors intelligent life at a much smaller scale, with their equivalent of microbes being built from the interactions of a veritable zoo of quantum fields rather than molecules and proteins.
Quarantine (1992) explores the copenhagen interpretation of quantum mechanics, set on a future earth where the technology to put the waveform of a human mind into superposition with reality was invented. The user could turn it on, then live all possible lives from that monent until the version of themselves that achieved the result they desired would turn it off and collapse reality back into a single state. This isn’t really possible for complicated physics reasons, but if it was then it’d enable seemingly impossible things to become true. The novel explores the consequences of such a future conflicting with the existence of alien species that evolved within superpositioned reality and can’t survive when it’s collapsed into a single unique state.
This is very complicated, let me sleep on it, i will come back to your comment later.
“Information” in the quantum sense refers to the waveform of the quantum system as a whole, which is kind of a weird thing to get one’s head around.
Even in the case of chaotic pendulums, there’s no theoretical principle that keeps us from observing and accounting for every particle and quanta of energy involved and using that to prove that the waveform of the entire pendulum is consistent with itself and the expected evolution from previous states.
But the event horizons of black holes seem to break that rule, because the waveforms of black holes can be described with just three properties; mass, charge, and spin. There didn’t seem to be “room” for them to encode all the waveforms of anything that falls inside until Stephen Hawking theorized that it could be saved in polarization states of the event horizon boundary and black holes would gradually radiate it away.
i like science and its immense benefits in most fields, still, i resist some theories and ideas.
Thanks again for your clear explanations … but i will not be scientific on this ! … and will prefer my “feelings” instead of the scientific consensus. Considering this, it’s a good thing I’m not working in this field 🤣
Yes, that’s how science usually works
Water might be wet, updates to follow as this story develops. Over to you, Pat.
