This might be a bit of a noob question and is definitely weird but I'm just curious... If someone sprint-jumped, the trajectory of their vertical motion would curve, and their direction of their velocity would slowly change as the momentum of their ascent would decrease and gravity would continue pulling. What if during their ascent, the mass of the person halved, so gravity would have a lesser effect, would the change of their velocity change immediately, or would it decelerate?

would the change of the direction of their velocity change immediately**

not the velocity itself*

or the speed

@EmilioPisanty Really? Although a full obstruction is quite rare, if there is only a few singularities, you can always have the function defined on some weirdly foliated manifold

@G.Bergeron yeah, sure, but that's what goes into "modulo branch cuts and whatnot"

I'm talking about cases where no mater how you try to get around the singularities, there's a wall of fire on the boundary

@Monad instantly change: the acceleration would instantly halve. But then how can you halve instantly the mass, you will have a much bigger problem making mass disappear

@Monad It will halve, not reverse

@G.Bergeron thanks, I posed the scenario hypothetically, I know halving mass is a completely different issue.

The numerical did led to nice pictures though!

Can we post pictures?

hello

@G.Bergeron, yeah, click the upload button to the right of the send button

Nice!

@heather Thanks

no problem

@G.Bergeron hi do you have a masters? physics? whats the title?

@vzn yes

The thesis was by publication with this paper : arxiv.org/abs/1507.00018

The rest was a discussion of the importance of the Clebsch-Gordan decomposition but is in French

papyrus.bib.umontreal.ca/xmlui/handle/1866/2329/…

@vzn but why?

If it's because of the picture this was from a first run (wrong results and numerical noise) of calculating the 4-spinons contribution to the dynamical structure factor of the an anisotropic spin chain in the antiferromagnetic regime from bookstore.ams.org/cbms-85

@JohnRennie cool!

'sup, @heather?

@JohnRennie LOL

Good grief my todo list just exploded.

I'm not good at time management. Having too many simultaneous projects makes me really inefficient.

@ACuriousMind Pretty sure you di in undergrad QM

@G.Bergeron cool welcome to chat. we have done some special speaker sessions in chat last summer with great reception & are always looking for new faces/ volunteers. roughly similar to reddit AMAs. any interest? meta.physics.stackexchange.com/questions/7783/…

@DanielSank You're doing good! You have a todo list