musgravepeter

11 ms·

61.
by musgravepeter 10y ago
And there's http://xkcd.com/1758/ Although getting out the business of "mysterious stuff we can't detect" is very appealing, I'm reminded that the neutrino once had that status...
62.
Sabbatical Week(nbodyphysics.com)
1 points by musgravepeter 10y ago|0 comments
63.
by musgravepeter 10y ago
The Kepler equation solver is the standard Newton iteration, which is ok until e gets larger. The actual N-body simulator in gravity engine allows for better orbits and the integrator is configurable (Hermite, Leapfrog) and easy to extend.
64.
by musgravepeter 10y ago
I'm a big fan of orbiting problems. There are some cool references on your gitlab - I'll need to dig through them sometime. Now some of my "tooting": I did a quick JS Kepler evolver ( http://nbodyphysics.com&#x
65.
by musgravepeter 10y ago
Can anyone recommend a "cannonical" textbook that describes K-T transitions at an upper-year undergraduate level?
66.
by musgravepeter 10y ago
In some ill-defined dual space of a Bogdanov manifold there is the Sokal affair: https://en.wikipedia.org/wiki/Sokal_affair
67.
by musgravepeter 10y ago
Together with "There are no particles, only fields" ( https://arxiv.org/abs/1204.4616 ) at the top of my web reading list.
68.
by musgravepeter 10y ago
There is some great info at http://www.ridethetrail.ca/ . Many parts of the trail are on roads or have ATV access - which is not ideal for those who prefer human powered locomotion. A cross-Canada trail is an awesome goal -
69.
by musgravepeter 10y ago
If you want to tinker with gravity, you can try ThreeBody (Lite or Full) on iOS/Android. Disclaimer - I'm the developer.
70.
by musgravepeter 10y ago
Flagged by my Google alert on "three body". WAY more triple homicides than physics articles, but every once in awhile something good like this shows up!
71.
The only way to solve the three body problem(wired.com)
2 points by musgravepeter 10y ago|1 comments
72.
by musgravepeter 10y ago
I'm assuming it's the exam team member that wants to torpedo a student to show how smart s/he is by asking something tricky or tangential. I was lucky. My supervisor asked for recommendations for who to ask from the Math depa
73.
Planetary Orbits in JavaScript(nbodyphysics.com)
2 points by musgravepeter 10y ago|0 comments
74.
by musgravepeter 10y ago
I have been developing odd-ball physics apps (ThreeBody, Geodesic Asteroids most recently). I'd say I put in about 10 hrs/week => 520/yr. Last year my revenues were up 400% (to $88) with expenses of about $400 (apple devel
75.
A roadmap to interstellar flight(arxiv.org)
5 points by musgravepeter 11y ago|1 comments
76.
by musgravepeter 11y ago
When will the Unity game engine support this?
77.
by musgravepeter 11y ago
My favourite was some Telecom code that returned "Not Kansas", as in "We've not in Kansas anymore".
78.
Scan of King Tuts tomb shows hidden rooms(phys.org)
2 points by musgravepeter 11y ago|0 comments
79.
Lectures on Dark Matter Physics(arxiv.org)
1 points by musgravepeter 11y ago|0 comments
80.
by musgravepeter 11y ago
Thanks for the snippet. Working code is a good thing. I tend to rat-hole on the physics stuff, since I have a background in it.
81.
by musgravepeter 11y ago
As a fellow physics geek mobile dev (eg. ThreeBody, Geodesic Asteroids) I gotta ask: how are you modelling the gravitational force?
82.
by musgravepeter 11y ago
I thought the comment on exterior differential forms was interesting. I always wanted to delve into those and better understand what a dx all by itself was when separated from dy/dx by simple manipulation. Loved his comment "We ju
83.
Elliptical Orbits on Spandex(arxiv.org)
2 points by musgravepeter 11y ago|0 comments
84.
by musgravepeter 11y ago
The mass of the "test particle" Cassini will cancel out of orbit equation but will matter for drag, radiation pressure etc. If it's outside the error bars they gave for mass, then this is conceivable. OTOH this is a pretty co
85.
by musgravepeter 11y ago
Thanks for the link. That is a pretty long paper!
86.
by musgravepeter 11y ago
"Leaving Orbit - Notes from the last days of American spaceflight" - pleasantly sentimental view of the wind down of the shuttle program. "The Dark Forest" 2nd installment in Three Body Problem series. Quite clever. &quo
87.
It's a Trap: Emperor Palpatine's Poison Pill(arxiv.org)
116 points by musgravepeter 11y ago|92 comments
88.
Show HN: Can You Solve the Three Body Problem?(itunes.com)
1 points by musgravepeter 11y ago|0 comments
89.
by musgravepeter 11y ago
The most important part of this is to do the problems! After a PhD in theoretical physics then 20 years as a s/w developer I decided to get some of my chops back. You can read and nod about stuff but until you face a blank sheet of pap
90.
by musgravepeter 11y ago
Thanks! There is also a discussion in The Million Body Problem (Heggie & Hut). Looking forward to poking around in this.

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