About Digital Physics
It's sometimes stated that digital physics is being disproven, or at least made unlikely, by the modern discoveries in the field of quantum physics. Namely, the recently discovered laws of physics often describe the world in terms of probabilities. Sometimes those probabilities behave in a way different from what we are used to outside of the world of atoms, electrons and photons. Single electron particles, for example, when set to go through a board with two slits, hit the flourescent wall behind it generating the same probability distribution as wave interferences do. And the direction of their spin appears to be affected by the previously measured spin of an electron that's in the same plane but can be very far away. But here is a thing: if you make enough assumptions about those particles, you can actually explain away their behaviour using the laws of physics we are familiar with from everyday life. There have been some attempts to do so, the most notable being the pilot-wave theory. They aren't accepted not because they give incorrect predictions, but because they supposedly aren't the simplest explanation. So, the exact laws that govern the way subatomic particles move are not metaphysically meaningful.
Digital physics is not widely accepted, and the main reason for that is probably that it's not being comunicated in a good way. Digital physics is often described, even by its proponents, as the theory that the world could be a computer simulation. That's quite a bit misleading. Digital physics doesn't suppose it's likely that our universe is simulated by some giant computer in some alien civilisation, it simply supposes that the fundemental laws of nature are such that they could, in principle, be simulated by an enough-powerful computer. A perhaps better summary would be that the universe itself is a giant computer (not a "computer simulation").
So, here are some of its implications:
1. The material world doesn't exist. Every being in the world is made only of information that's manageable by a computer, that is, ideas.
2. There are no miracles. Every event that happens in the world has to be explicable using those fundemental and computable natural laws.
3. God doesn't, and can't, exist. The same goes for the afterlife.
4. Free will is entirely explicable using the computational complexity. Every system with enough computational complexity can be said to have free will.
5. Space and time themselves are made of pixels, small pieces of information. Each pixel is connected to a relatively small number of other pixels by an adjacency list. A change (movement) in one of these pixels can be caused only by the state of the pixels it's connected to. If you know the state of the pixels it's connected to, you can calculate its state.
I realize that most of the implications I've listed seem absurd to most of the people today. But it's actually very easy to argue for them. Space and time being made of pixels appears to efficiently solve the Zeno's paradox of the Achiles and Tortoise.
For most of the people today, the idea that the material world doesn't exist seems absurd. But, to paraphrase George Berkeley, we can only percieve ideas. When we say we see the Moon, we don't mean we percieve the Moon itself, we percieve only its appereance. And appereance is an idea. And the ideas can't be caused by material things, they share no properties of material things. Ideas can only be caused by other ideas. Therefore, the Moon can't be made only of material things, it has to be made of ideas. So, even if matter does exist, we have no way of percieving it. It can't have an effect on anything we percieve, and it's therefore not a part of this world in any meaningful way.
Many people would say there is enough evidence of miracles supposedly occured in history, like the resurrection of the Christ. I think that they say that because they haven't tried to imagine the situation the New Testament describes. Imagine that someone you love is murdered. While you grieve, there comes some stranger and claims he is that person who rose from the dead. Would you believe him? Of course not! Then why do people think the apostles were right to do so? We appear to be bombarded with the examples of miracles occuring everywhere. However, we almost never have enough knowledge to evaluate those examples. And when we do, we end up with a conclusion that maybe it wasn't a miracle after all. People in ancient times used to believe that everything was a miracle: earthquakes meant spirits were displeased and a flash from sky meant God was angry. Today, we laugh at those superstitions. Yet, many people use that same type of reasoning today.
The simple truth is, if there was a good all-powerful God, there would be no evil in the world. But there obviously is. And, no, free will is not the only cause of it. How could free will be responsible for the earthquakes and the children being born ill?
Many people find the idea that there is no afterlife frightening. Well, I find the idea of there being one way more frighteneing. Think of it this way: you were dead for eternity before you were born. It's not that you suffered because of that, you just simply weren't there. And I find it comforting to think that everyone who claims there is something to be affraid of after you die is just sucking that out of his little finger.
Atheism has a bad name, because some of the well-known atheists, like Karl Marx, just replaced God with another dogma, like communism. Socialism and communism don't logically follow from atheism in any way.
I hope I've communicated the ideas of digital physics in an understandable and thought-provoking way. I understand that, if you this is the first time you were exposed to the ideas of digital physics, you probably aren't convinced. In fact, you likely consider me crazy. It's OK, I just hope I've made you think so that you might change your mind.
UPDATE on 03/06/2018: There are many examples of how physical phenomena, which are almost impossible to calculate by hand, can be simulated by a computer program of just a few lines of code. One of them I've made is the analog clock linked to the left (the pendular movement is extremely hard to calculate, yet it can be easily simulated by a computer). The other one might be the electric field simulator I've made today. So, why couldn't the whole universe be just like that?