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Question 1

0votes

1answer

85views

Does a "High-Level" emergence theory exist to classify and predict macroscopic structures?

In complex systems (e.g., Turing-Complete Cellular Automata, or the physical universe governed by known laws), the evolution atleast on a larger scale seems to behave according to fixed rules, yet ...

inquisitive

355

asked2 days ago

Question 2

0votes

0answers

32views

How to calculate transition dipole moment computationally? [closed]

Interested to calculate TDM of a molecule in the presence of a dielectric. What is the go-to way right now in research circles?

Gourav Kumar Tanti

91

asked2 days ago

Question 3

-4votes

0answers

84views

Conceptually, what's the effect of an exponential gravitational tilt in non-unformal gravity on a Quantum Harmonic oscillator? [closed]

Diving into this topic, I'd like the know whether the results of diving into this question, and/or could be explain very simply using textbook knowledge or if it's a feasibly novel to a degree.Thank ...

Aryan Kar

1

askedNov 21 at 16:24

Question 4

0votes

1answer

61views

Are $N$-body perimeters in 2D expected to collapse into a singularity?

Assume a structure of identical unit-mass point particles forming a two-dimensional perimeter (such as a ring), and the only force acting on the structure is the gravitational interaction between the ...

innating

52

askedNov 5 at 23:39

Question 5

3votes

0answers

68views

Diffusion equation after one time-step [closed]

Consider the equation:$$\partial_tu=D\partial_{xx}^2u$$with reflecting boundary condition at $x=0$ and with $u(x,0)=\delta(x)$ as an initial distribution.First question: How should I understand a ...

scleronomous

31

askedNov 5 at 16:57

Question 6

1vote

1answer

78views

Is this 2d revolute joint behavior normal?

I hope this kind of question can be asked here :) .I coded 2 bodies of rectangular shape like show in the imageThe force (that is applied to only body 1) varies to always be perpendicular to body 1 ...

Guill Guill

11

askedOct 2 at 12:41

Question 7

5votes

2answers

384views

Active Brownian Particle simulation

I am trying to reproduce the results from the paper "Simulation of the active Brownian motion of a microswimmer, G. Volpe, S. Gigan and G. Volpe, AJP 2014", where they simulation the motion ...

sohein

85

askedOct 1 at 15:41

Question 8

1vote

0answers

76views

Add healing length to the inverted parabola of Bose-Einstein Condensates

In the non-interacting case, the Gross–Pitaevskii equation, gives an inverted parabola for the Bose–Einstein condensate (BEC) density in 1D:$$n(x) = \mu -\left(\frac{x}{r_{TF}}\right)^2 \ ,$$where $\...

kai90

751

askedSep 17 at 8:08

Question 9

0votes

1answer

164views

Available simulation tools for quantum Hamiltonians [closed]

I have a quantum Hamiltonian describing the interaction of several spins. I wanted to try to simulate my system and measure quantities such as the polarization of the spins, the magnetization and ...

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mattiav27

Question 10

2votes

0answers

129views

Modeling decoherence with a Schrödinger equation solver and heat equation solver in tandem through a Wigner transform?

Premise: In the long-wavelength limit, decoherence is modeled with a master equation for the evolution of the density matrix,$$\frac{\partial \rho(x,x',t)}{\partial t} = -\frac{\mathrm{i}}{2m}\Bigg(\...

saturn

171

askedSep 12 at 13:59

Question 11

1vote

2answers

254views

Why doesn't light have decoherence?

I was thinking that, if one were to make a realistic physics engine, quantum effects could be ignored due to decoherence making them insignificant in the result. However, for light, it seems quantum ...

Flamethrower

571

askedSep 8 at 12:45

Question 12

1vote

2answers

171views

How to use Runge-Kutta method for rocket in atmosphere? [closed]

Position of missile = PThrust vector = TTime = tGravity vector = gI have a simulation on desmos where I have an AIM-9 sidewinder and am trying to make an accurate simulation with atmospheric drag ...

GIORGI GOGIBERIDZE

35

askedAug 29 at 13:53

Question 13

2votes

1answer

200views

Ensuring the stability and validity of a numerical solution for the Fokker-Planck equation

I am developing a finite-difference numerical scheme for solving the Fokker–Planck equation. The scheme is validated by comparing its solutions with histograms constructed from trajectories of the ...

cdt123

41

askedAug 16 at 12:12

Question 14

2votes

0answers

77views

How should PM compare to Zeldovich approximation before shellcrossing in 2D with plane waves? [closed]

I attempted to do a N-body-simulation and compare it to the analytical Zeldovich map until shell-crossing appears.In order to do so, I placed them uniformly with the Zeldovich initial condition, e.g ...

alo bre

21

askedAug 16 at 11:11

Question 15

1vote

1answer

122views

Trying to prove that a rolling circle on the ground maintains its motion [closed]

I was trying to prove that a rolling circle on the ground will always roll with the same motion. I tried to model this problem as two circles rolling against each other, and then, I want to show that ...

bowen951209

11

askedAug 14 at 11:06

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Stack Exchange Network

Questions tagged [simulations]

Does a "High-Level" emergence theory exist to classify and predict macroscopic structures?

How to calculate transition dipole moment computationally? [closed]

Conceptually, what's the effect of an exponential gravitational tilt in non-unformal gravity on a Quantum Harmonic oscillator? [closed]

Are $N$-body perimeters in 2D expected to collapse into a singularity?

Diffusion equation after one time-step [closed]

Is this 2d revolute joint behavior normal?

Active Brownian Particle simulation

Add healing length to the inverted parabola of Bose-Einstein Condensates

Available simulation tools for quantum Hamiltonians [closed]

Modeling decoherence with a Schrödinger equation solver and heat equation solver in tandem through a Wigner transform?

Why doesn't light have decoherence?

How to use Runge-Kutta method for rocket in atmosphere? [closed]

Ensuring the stability and validity of a numerical solution for the Fokker-Planck equation

How should PM compare to Zeldovich approximation before shellcrossing in 2D with plane waves? [closed]

Trying to prove that a rolling circle on the ground maintains its motion [closed]

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