## Feynman diagrams in three dimensions

Is there such a thing as an extension of Feynman diagrams into three dimensions? Canonical Feynman diagrams use one space and one time dimension to visualize processes involving elementary particles in space-time. This is very convenient for presenting them on a two-dimensional surface, such as in an academic paper. It seems to me that with … Read more

## Physical visualisation of curvature

I was wondering-how do you visualise curvature in the context of general relativity. The gravity well and trampoline analogies are quite wrong, so I want a more realistic approach to it (say, the way Einstein himself might have visualised it). Mathematically, it all makes sense, but I am not really sure how does this really … Read more

## What observable is visualized in lattice QCD visualizations?

I have seen a couple of visualizations of lattice QCD, for instance the images by Derek Leinweber. Using my own data I would like to make similar visualizations. I am just not sure what I actually see on this image. The quantity visualized must be a gauge invariant observable. So just using the links Uμν … Read more

## How could the universe be hyperbolic if hyperbolic space isn’t symmetrical?

In the 2-D projections of the shape of the universe shown here, we see that the flat universe and the spherical universe are perfectly symmetrical, so any triangle drawn anywhere on them will be the same. However, the hyperbolic universe appears to only be symmetrical on two axes, so any triangle drawn anywhere on it … Read more

## Identity of dynamical Dpp-branes

In my String Theory course, we introduced Dp-branes, and I’m having trouble picturing them as dynamical objects. We analyzed the open and closed bosonic strings, found the EoM, quantized them, and found out that their oscillations can be seen as the various fields that we already know, so their interpretation is, to me, relatively simple. … Read more

## How does warped space actually look (visually)?

Recently, I was reading about space warping due to extreme gravity and at speeds approaching c, but in books, they always show space in 2D and depth to show space distortion. I was wondering how exactly warped space look in actual? Answer As you travel through the warped spacetime, you would not notice much difference. … Read more

## Converting spectra to rgb colour

I am having trouble obtaining RGB colour values from the spectra of an object. I have the specific flux Fν as a function of ν for each pixel of the image I’d like to make, but am unsure of how to turn this into RGB. The proper method seems to be to calculate the XYZ … Read more