Recent content by zwoodrow

What is the field of study called that classifies homomophisms of groups?

I am learning the cartan formalism from the book Relativity Demystified. It has a few examples. I am looking for more examples in video, notes, or books of the work calculations of the connection one forms and the curvature two forms to check my calculations against. My search so far has turned...

I have been learning gr on YouTube for the last few months. Most of the videos and the book I have focus on high level understanding. I can do all of the tensor calculus proofs. However simple questions like how you set up a velocity vector or measure proper time in schwarzschild are beyond me...

Is the use of proper time just for ease of simple equations? ie you could define velocity and acceleration with any reference time you want but all other choices are arbitrary other than proper time- proper time is the only time that is special. It seems to me that if you use proper time then...

Is there a list of all the general relativity lecture videos somewhere? Most of the videos I find do not have very good resolution of the black boards.

The guy that did this jump rode a balloon up 10+ miles in the atmospher where the air pressure was 1/80 He essentally had no atmosphere to speak of. Where does your extrapolation end? 10 miles 100 miles off the surface if your half way between the Earth and the moon what your saying doesn't...

So I've read the highest skydive occurred from a balloon and the entire jump lasted on the order of 10s of minutes. Heres my question: How the do you know where your going to land? The Earth rotates at ~1000mi per hour that's 12 mi per minute or 2.7 miles per 10 secs. So did these people use...

Has anyone ever seen the treatment of a closed classical string loop. Like if you had a loop of string on the space shuttle and subject it to accoustic driving or initial impulses. I post this here in beyond the standard model because no one in the classical physics section seems to have heard...

The free end of a classical vibrating string imposes the boundary condition that the spatial deriviative of the string at the end must be zero. I can hand wavingly argue this with free body diagrams and manipulate the differential force approximations but i can't come up with a terse intuitive...

Can someone recommend a good book or notes detailing the use of the Fourier transform with wave trains. Something short and sweet hopefully. thanks

I am learning about adv quantum and field theory and i have run across something unfamiliar mathematically. In several instances the author simpy expands the field or a wave function as a Fourier transform. that is they assume the field or wave function is simply the transform of two other...

Has anyone seen a treatment of how to use the wave equation to describe a closed loop of string. I am talking ordinary strings here not the fancy string theory kind.

if f(t) has period T then f(kt) has a period T/k. What is a simple proof of this.

thank you, oh dear god i am going to be crucified by all of the nerds for that one.

Does anyone have a link to good set of solved relativistic collision problems or tutorials?