Topics I like to read about and know nothing about.
The digital simulation hypothesis (Seth Lloyd and Frank Tipler)
Posed from quantum information physics and thermodynamics by scientists like Seth Lloyd (MIT):
The premise: The universe is not made of "matter," but of processed information. The entire cosmos is, literally, a giant quantum computer. Subatomic particles are nothing more than qubits changing states.Seth Lloyd's view (MIT)
The radical version: In its cosmological variant, it is suggested that our entire physical reality could be a simulation running on the computing infrastructure of a higher civilization or entity.
Seth Lloyd proposes that the universe can be modeled as (and in a sense is) a giant quantum computer; Frank Tipler contributes related cosmological ideas about infinite computing capacity in the far future.
Lloyd argues, from the physics of information and quantum computing, that:
Every physical entity registers information (bits/qubits). Atoms, elementary particles, and fields act as registers.
Physical interactions (collisions, unitary evolutions, etc.) process that information: they change the state of those qubits.
Therefore, the universe performs a continuous quantum computation of itself. This is not a metaphor: the laws of physics are the "machine code" and the dynamics of the universe are the running program.
In works like "The Universe as Quantum Computer" (arXiv:1312.4455) and his book Programming the Universe, Lloyd shows that this model naturally explains the emergence of complexity from simple rules + quantum randomness, and calculates physical limits to the computational capacity of the observable universe (on the order of 10^120 operations on 10^90 bits since the Big Bang, figures that depend on fundamental constants and the age of the universe).
Important: Lloyd does not necessarily claim that we live inside a simulation created by someone else. He claims that the universe is quantum computation. It is compatible with known physics and does not require an "external infrastructure."
Frank Tipler and the cosmological context. The radical version (simulation by a higher entity)
Tipler is best known for the Omega Point cosmology: in a closed, collapsing universe, computational capacity can diverge to infinity near the final singularity. Within that speculative framework, a future civilization could emulate (simulate with arbitrary fidelity) past histories, including "resurrections" of minds. His work connects general relativity, quantum mechanics, and computing. This is the idea that our complete physical reality is a simulation running on hardware belonging to a higher-level civilization or entity.
In layman's terms: Lloyd contends that the universe processes information like a quantum computer—every particle is a bit (or qubit) that changes state according to rules—and Tipler takes that to an afterlife version: in his "Omega Point," a future civilization with infinite computational power ends up simulating (literally resurrecting) every being that ever existed.
Descartes, the first user to suspect the system
While Seth Lloyd needed five centuries of physics, an MIT doctorate, and a calculator capable of handling numbers on the order of 10^120, there was a Frenchman who arrived at a similar suspicion sitting next to a stove, in 1641, with no technology other than his own distrust. René Descartes, in the first of his Meditations on First Philosophy, proposes an exercise that today would be the perfect script for a science fiction movie: doubt absolutely everything he thinks he knows, to see what survives the doubt.
And there, before reaching his famous "I think, therefore I am," Descartes pauses at a hypothesis that feels uncomfortably familiar: what if there is an evil demon—a deus deceptor, an all-powerful deceiver—whose sole occupation is making me believe that the sky, the air, the earth, colors, shapes, sounds, and all external things are nothing more than illusions he uses to set traps for my credulity? There is no structural difference between that evil demon and the "higher civilization" Tipler imagines simulating entire universes with post-cosmic hardware: in both cases, someone (or something) with enough power generates a complete, coherent, and deceptive experience of the world, and the subject trapped inside has, in principle, no way of knowing it from within the system.
The difference—and here is what makes it more interesting than a simple "someone else already thought of this"—is that Descartes didn't need to postulate qubits or future civilizations to get to the same place. It was enough for him to notice that none of his senses could, on their own, guarantee him that what he perceived corresponded to something real. Lloyd calculates how many operations the universe may have executed since the Big Bang; Descartes, with far less computing power, had already calculated that this number, whatever it was, was useless to him if he couldn't first trust his own senses to count it.
It is, once again, the same pattern as with Schopenhauer: the contemporary scientist arrives armed with cutting-edge physics at a conclusion the philosopher had already reached with a stove, a chair, and a free afternoon. Only this time, Descartes' evil demon doesn't deceive with indeterminate space and time, but with something closer to an infrastructure problem: if someone—or something—is generating this experience in real-time, the question is no longer just "is what I see real?", but "what bandwidth am I being served with?".
The support tech committee (or why no one is going to reset the universe's router)
The scientific community took little time to line up and point out the problem: calling the universe a "computer" sounds spectacular in a TED Talk, but it looks suspiciously like what generation after generation did with every trendy metaphor. To the Greeks, the cosmos seemed like a clockwork mechanism; to the Victorians, a great steam engine; to us, with our phones glued to our hands, it feels natural to imagine it as a computer. The problem is that a real computer has well-defined input, processing, and output, and here the output—the concrete result we observe when we measure something—remains as big a mystery as it was before calling it a "qubit." It's like calling the refrigerator an "app" because it cools things down: you're using a trendy word for a phenomenon you don't actually understand any better than before, only now it sounds sleeker in an interview.
And then there's the resource problem, which is where the satire practically serves itself. Calculating how much energy it would take to simulate, even in low resolution, an entire universe yields numbers so absurd that not even the most advanced civilization in the cosmos—with access to entire galaxies as a power source—could stomach the electricity bill. It's the cosmic equivalent of trying to run a next-gen video game on a laptop that was already struggling to open Paint: technically, in some alternate universe, maybe. Here, not a chance. So the next time your thermos gets stuck, it's not a Matrix glitch: it's your thermos, which is genuinely broken, with no higher civilization involved in the matter.
The most ambitious version, the Omega Point, received an even less generous treatment: it was directly labeled a masterpiece of pseudoscience, largely because it depends on the universe collapsing in on itself in the future—something that, according to everything we observe today, isn't going to happen, because the universe is expanding faster and faster, not slowing down to turn around and shrink. It's like planning your retirement assuming that at some point you'll inherit an empire, without having any rich uncle or any sign that such an empire exists. And let's not even mention the identity problem: even if someone, someday, managed to "recreate" every atom of your grandmother with perfect precision, that doesn't bring your grandmother back to you; it gives you an extremely expensive, high-resolution photocopy. Déjà vu, in this framework, stops being a dramatic glitch in the simulation and becomes what it probably always was: that you slept poorly.
Finally, not even Occam's Razor—that old rule about not multiplying entities unnecessarily—escaped the party unscathed: if this is a simulation, someone had to simulate the simulator, who in turn was simulated by another, in an infinite line of servers where, inevitably, someone eventually runs out of battery. So no, there's no need to complain to tech support about the universe's bad signal. Nobody on the other end is picking up the ticket. And if they are picking it up, they're taking so long that, for all practical purposes, it's exactly the same as if the universe were, simply, real.
The butterfly's plea
The silence that followed the technical demolition didn't last very long. Descartes, satisfied with having planted the seed of doubt a couple of centuries before anyone paid him royalties for it, was already adjusting his wig to take his leave. The support techs were closing their energy calculation folders with the gesture of someone who just cut off a complaint before it reached higher management. And in some corner, Lloyd and Tipler were arguing between themselves over whether the problem had been bandwidth or mismanaged expectations.
It was then that something crossed the room—not with a roar, not with an aura of cosmic energy, but merely brushing the air—and settled softly on nobody's shoulder in particular. A butterfly. Or perhaps not. Because the first thing it said, in a voice that seemed to arrive from 2,300 years ago and from nowhere in particular, was:
—Excuse me. Before you keep arguing about whether this is a simulation or not, I have a preliminary question: how do you know you are the ones arguing?
Nobody quite understood, so the butterfly—or whatever was speaking through it—continued, with the patience of someone who has already explained this many times to no avail:
—A long time ago I dreamed I was a butterfly, fluttering about at ease, unaware that I was Zhuangzi. And when I woke up, I didn't know if I was Zhuangzi who had dreamed of being a butterfly, or if I was now a butterfly dreaming I was Zhuangzi. You have been arguing for a while now about whether the universe is matter or code, whether the substrate is carbon or silicon, whether someone on some cosmic server is charging you the electric bill. And I ask you: why do you take for granted that there is a difference worth fighting over?
Descartes, who couldn't stand having a doubt that had cost him six full meditations simplified like that, tried to protest:
—With all due respect, the question is not trivial. If this is an illusion orchestrated by a deceiver, or a simulation running on someone else's hardware, there is a radical difference compared to it being real.
—Is there? —the butterfly fluttered, unhurriedly—. You need an "outside" to exist so you can sleep peacefully at night: a real world behind the dream, an original behind the copy, a programmer behind the program. I don't. To me, it's all the same whether I flutter knowing I am a butterfly or flutter knowing I am a man dreaming he is a butterfly. The fluttering is the same. The transformation of things—what we call wu hua—doesn't need you to decide which version is the true one. It simply happens, whether you are arguing around it or not.
The support techs, who had spent the previous block calculating how many entire galaxies it would take to simulate a universe, tried one last argument:
—But the numbers don't add up. The required energy is...
—The numbers don't add up for you —interrupted the butterfly, with an exasperating calm—, because you need them to add up so you can sleep tonight knowing which side of the screen you're on. I couldn't care less about the energy balance of the cosmos. If tomorrow you discover that yes, all of this runs on someone else's server, I'm going to keep fluttering in the exact same way. And if you discover that no, this is the realest thing there is, I will too. Your question is legitimate. My indifference is, too.
And having said this, without waiting for a reply—because it never expects them, and that is perhaps its most elegant way of being right—the butterfly rose, crossed the window, and vanished into an outside that, real or simulated, still had, that afternoon, very good light.
And so the universe—between the methodical doubt of a Frenchman with a stove, the disenchantment of a committee that ran the numbers, and the luminous indifference of a butterfly that never wanted to know which side of the dream it was on—continues to function, with good or bad signal, without needing anyone, entirely, to agree.
Transparency note: My own idea with AI-generated text revised by me. I used Gemini, Claude, and Grok.
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