19/04/27 13:57:52.18 VJaCQacd.net
>>85
つづき
Rachel Crowell: What first drew you to amplitudeology? Why is the field booming right now?
Matthew von Hippel: I got into amplitudeology as a bit of a happy accident. I was interested in string theory, but the string theorist I asked to work with had an amplitudes project he needed done. Working on that connected me to the amplitudeology community, and I've been enjoying working with them ever since.
I think amplitudeology is growing right now because it's an ideal mix of practical physics and beautiful math. We get to dabble in number theory, algebraic geometry, combinatorics...but at the end of the day, we're developing techniques that can be used for real calculations, comparing to real data from the Large Hadron Collider.
RC: You wrote "The toy model we use is very well-behaved. One of its nicer traits is that for the kind of calculations we do, Goncharov's method always works: we can always break the integral up into an alphabet of logarithms, of integrals over circles.
In the real world, this tactic runs into problems at two loops: two integrals can get tangled together so they cannot be separated." How do the integrals get tangled so they cannot be separated?
MvH: That ended up being a bit of a strained metaphor, unfortunately. To go a little more technical, sometimes your integral has a square root of a polynomial in it.
If that polynomial is quadratic, often you can change variables and write it in terms of a sum of logarithms, each with one "period." If it's cubic, you can't, you get an elliptic integral with two "fundamental periods."
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