# Questions tagged [physics]

All issues relation physics and computation theory (excluding computational hardware or use of computers in physics). May include, for example, analog computing, reversible computing, physical analysis of computability (Church-Turing thesis).

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### Is there any known method to simulate a UTM with an instance family of the three body problem in physics?

I think it would be challenging since the three body problem is about continuous movement and Turing machines execute in discrete steps.
0answers
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### What problem is this application of simulated annealing trying to solve?

I was reading about simulated annealing on its Wikipedia page, and was drawn to a particular example illustrating the annealing schedule. Below is the picture and its description: Example ...
4answers
3k views

### Can one build a “mechanical” universal Turing machine?

This question connects different disciplines so it's awkward to choose a SE site for it, but I'll go with this one because here (I hope) the shared culture will make information transfer easier. So ...
1answer
76 views

### Evenly Spaced Points On Smooth Surface

I want to space points evenly (i.e. maximizing minimal distance between two points) on some smooth surface $S\subseteq\mathbf{R}^n$ (usually $n=3$), where I have a projection operator \$p:\mathbf{R}^n\...
1answer
40 views

### Would models of computation in other conceivable universes be Turing complete?

I'm interested in gathering some references that discuss the topic of the relationship between computation and physics. Specifically, I'm interested in investigating two points of view: our current ...
0answers
19 views

### Crossover method for 3D velocity vector genetic algorithm

I am trying to write a genetic algorithm which will learn how to throw a ball at a target. I have successfully implemented code that will graph the projectile motion of a sphere given an input ...
1answer
64 views

### How does one simulate continuous gravity using a discrete timestep?

While gravity in real life is continuous, computers are limited to discrete calculations. Therefore, a seemingly correct projectile simulation inevitably drifts off. For example: ...
0answers
29 views

### Questions about Seth Lloyd's Programming the Universe?

I have been interested in Seth Lloyd's cosmological model (which proposes that the universe is a computer: https://en.wikipedia.org/wiki/Programming_the_Universe, https://arxiv.org/abs/quant-ph/...
0answers
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### Do all Cellular Automata have some kind of information boundary? Can all Cellular Automata be modelled with the Bekenstein Bound?

Since they are discrete models, do they have some kind of information boundary? Can all Cellular Automata models be related to the Bekenstein Bound? https://en.wikipedia.org/wiki/Bekenstein_bound
1answer
83 views

### Did Wheeler really believe that physics was undecidable?

John Archibald Wheeler was a famous physicist It has been stated that he thought that there was a strong connection between undecidability and quantum physics This idea was given an early ...
1answer
214 views

### Is computer science really a branch or sub-branch of physics? [closed]

Given that a computer is basically an electronic machine, is computer science really a branch of electronics, which is in turn a branch of physics?
1answer
164 views

### The Ising Model and Computational Complexity

I've been told recently that one can use the Ising model can find solutions to certain NP-hard problems, such as Clique, although it doesn't do so in polynomial time. Googling gets a few Arxiv ...
0answers
29 views

### Is there any specific model/theory that proposes that the universe is an oracle machine? [closed]

Is there any specific (and well known/famous) model/theory that proposes that the universe is an oracle machine? Physicist Roger Penrose said his book "The Shadows of the Mind" It would be just as ...
1answer
142 views

### Are physical laws uncomputable in any type of computation (according to this article)?

It seems that this article (https://arxiv.org/pdf/1312.4456.pdf) proposes that laws of physics are uncomputable (i.e., they could not be reproduced on a computer), but I'm not sure about it. In some ...
1answer
42 views

### Potential General Model of Computation with Physics?

I posted a question about a month back regarding the significance of Turing machines (relative to other models of computation). In that post, I mentioned vaguely some conversion between an input ...
2answers
4k views

### What is the difference between luma and luminance?

I understand the following (correct me if I'm wrong): Statements Luma as the weighted sum of RGB gamma corrected components, but luminance is the weighted sum of RGB linear components. The gamma ...
1answer
106 views

### Learning dynamics

I recently learned about Q-learning, a reinforcement learning technique that directly estimates the expected value of taking an action in a state. I'm wondering if there exists techniques to do "...
1answer
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### Reference Request: Overlaps between complexity theory and dynamical systems?

Per Wikipedia: In mathematics, a dynamical system is a system in which a function describes the time dependence of a point in a geometrical space. Examples include the mathematical models that ...
0answers
79 views

### Research in realtime computational physics?

I am aware that there is a considerable amount of interest in computational mechanics for simulation of cloth, hair and other elastica, particularly for animation films. The methods developed by ...
1answer
256 views

### Patriot Missile Software Bug (Range Gate Calculation) [closed]

Okay so I was reading about the Patriot Missile Software Bug, where to calculate the predicted range gate the missile system relied on the time keeping, however it would convert the whole/integer time ...
3answers
706 views

### Can normal physics laws be simulated in Digital physics? [closed]

Physics is defined as the study of an object {matter or energy} with its interaction with other objects: Physics is the study of matter, energy, and the interaction between them. On the other ...
3answers
890 views

### Could an NP-hard problem have a mechanical or physical solution method?

Is there any NP-hard problem that we can find a mechanical "polynomial time" solution to? For example, suppose we construct a graph out of something physical, e.g. we have have pipes through which we ...
6answers
555 views

### Undecidable problems limit physical theories

Does the existence of undecidable problems immediately imply the non-predictability of physical systems? Let us consider the halting problem, first we construct a physical UTM, say using the usual ...