Fizičari kažu da možda postoji način da se dokaže da živimo u kompjuterskoj simulaciji
According to Silas Beane and his team at the University of Bonn in Germany, a simulation of the universe should still have constraints, no matter how powerful. These limitations, they argue, would be observed by the people within the simulation as a kind of constraint on physical processes.
So, how could we ever hope to identify these constraints? Easy: We just need build our own simulation of the universe and find out. And in fact, this is fairly close to what the physicists are actually trying to do. To that end, they’ve created an ultra-small version of the universe that’s down to the femto-scale (which is even smaller than the nano-scale). And to help isolate the sought-after signature, the physicists are simulating quantum chromodynamics (QCD), which is the fundamental force in nature that gives rise to the strong nuclear force among protons and neutrons, and to nuclei and their interactions. To replace the space-time continuum, they are computing tiny, tightly spaced cubic „lattices.“ They call this „lattice gauge theory“ and it is subsequently providing new insights into the nature of matter itself.
Interestingly, the researchers consider their simulation to be a forerunner to more powerful versions in which molecules, cells, and even humans themselves might someday be generated. But for now, they’re interested in creating accurate models of cosmological processes — and finding out which ones might represent hard limits for simulations.
To that end, they have investigated the Greisen–Zatsepin–Kuzmin limit (or GZK cut-off) as a candidate — a cut-off in the spectrum of high energy particles. The GZK cut-off is particularly promising because it behaves quite interestingly within the QCD model.
According to the Physics arXiv blog, this cut-off is well known and comes about when high energy particles interact with the cosmic microwave background, thus losing energy as they travel long distances. The researchers have calculated that the lattice spacing imposes some additional features on the spectrum, namely that the angular distribution of the highest energy components should exhibit cubic symmetry in the rest of the lattice (causing it to deviate signiﬁcantly from isotropy).
„In other words,“ write the arXiv bloggers, „the cosmic rays would travel preferentially along the axes of the lattice, so we wouldn’t see them equally in all directions.“
And that would be the kind of reveal the physicists are looking for — an indication that there is indeed a man hiding behind the curtain.
And what’s particularly fascinating about this is that we can make this measurement now with our current level of technology. As the researchers point out, finding this effect would be the same as ‘seeing’ the orientation of the lattice on which our own universe is simulated.
That said, the researchers caution that future computer models may utilize completely different paradigms, ones that are outside of our comprehension. Moreover, this will only work if the lattice cut-off remains consistent with what we see in nature.
At any rate, it’s a remarkable suggestion — one that could serve as an important forerunner to further research and insights into this fasinating possibility.
The entire study can be found at Physics arXiv.
Top image via. Inset image courtesy Silas Beane.
- Topology: The Secret Ingredient In The Latest Theory of Everything (technologyreview.com)
- Higgs Boson and the Spiritual Universe (ieet.org)
- Confinement revisited (marcofrasca.wordpress.com)
- Higgs boson and conformal symmetry (marcofrasca.wordpress.com)
- Taking some guesswork out of high-energy physics (phys.org)
- Whoa, dude, are we in a computer right now? NASA scientist thinks we could be. (vice.com)
- How To Build A Phononic Computer (technologyreview.com)
- Published / Preprint: Systems of Brownian particles with asymmetric collisions. (arXiv:1210.0259v1 [math.PR]) (moneyscience.com)
- Fish are not inside-out insects (freethoughtblogs.com)
- Hard work vs groundbreaking discoveries in HE physics (motls.blogspot.com)