Mike Petersen

Researcher at the Institute for Astronomy (University of Edinburgh).

[Mike Petersen @GalcticDynamics]

It’s not like I’m thrilled with Amazon, but I’m so un-thrilled by a reliance on cars, and I like riding my bicycle!

[Mike Petersen @GalcticDynamics]

via @NYTOpinion, more terminal car brain content. It is the parked cars that are the problem (and definitely not the cyclists who inexplicably get blamed at the end of the piece). https://t.co/bIWtdbQTWp

[Mike Petersen @GalcticDynamics]

Credit where credit is due, Paris has now adjusted the traffic flow on a long stretch of Rue de Rivoli: full bicycle lanes in both directions, and only a single traffic lane. More of this, please!

[Mike Petersen @GalcticDynamics]

https://t.co/sRMsv2fB5R
"Probably the biggest challenge, though, is that Paris doesn’t yet have an ingrained cycling culture." Strongly disagree. This article pretends like motorised vehicles don't exist and it's just a battle between cyclists and pedestrians.

[Mike Petersen @GalcticDynamics]

To highlight one inaccauracy in the article as an example: Rue de Rivoli, described as a "multilane highway for cyclists", has plenty of non-taxi cars drive on it, as is obvious in the images and videos in the article!

[Mike Petersen @GalcticDynamics]

Dernière photo de la série : Place de la Concorde (8e arrondissement)

[Mike Petersen @GalcticDynamics]

Photos de mon vélo à Paris, une série occasionnelle.

D'abord, la Tour Eiffel (7eme arrondissement):

[Mike Petersen @GalcticDynamics]

Vue de Paris (depuis Meudon), plus mon vélo à un arrêt d'espresso

[Mike Petersen @GalcticDynamics]

No Paris bicycle adventure picture this month, because I'm working in NYC -- I did find my ideal breakfast and contemplation spot, though. One collaboration paper submitted (https://t.co/uxsyAmEmDH), more in progress!

[Mike Petersen @GalcticDynamics]

This paper had a rather winding path to publication, but it is out now. Sincere thanks to everyone who listened to me try to work out the kinks over the past couple of years. The code release is coming -- but I'm happy to talk early access, just contact me!

[Mike Petersen @GalcticDynamics]

Curious about force accuracy in gravity solvers for galaxy-scale simulations? Check out our newly-published paper laying out the technical side of adaptive basis function expansions: https://t.co/evfzeVBYim

[Mike Petersen @GalcticDynamics]

In contrast, both tree methods and direct methods will produce high variance, with bias tied to sample density. The upside is that tree and direct methods give you a lot of flexibility in the types of systems you can simulate.

[Mike Petersen @GalcticDynamics]

I contributed an algorithm that we used to define the average direction dark matter particles appear to be coming from, which anyone could use to compare their models to our results: https://t.co/zI9ByeAU3D

[Mike Petersen @GalcticDynamics]

Katelin wrote a paper with a very clean analysis of models for the local dark matter distribution and the implications for direct detection experiments!

[Katelin Donaldson @katelind07]

Really excited to say that my first paper went up on arXiv today 🎉

@GalcticDynamics, Jorge Peñarrubia and I have been working on characterising the effect of the LMC on the local dark matter distribution. 🧵

[Mike Petersen @GalcticDynamics]

Several additional models were left on the editing room floor in pursuit of a concise description of the dynamical effects -- a lot of behind-the-scenes work to distill the results.