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DIRAC1930

12:16 PM

Probably romanticizing the history of the electron, neutron, proton, positron

and of course the photon

Currently I would put my money on all fields being emergent in the same way the fields are emergent in cond-mat.

It sounds completely weird that the same methods work and you can quantize something like a lattice vibration and subsequently get an emergent particle i.e. a phonon

Sanjana

Why are homogeneous coordinates of $\mathbb{CP}^m$ sections of the hyperplane line bundle?

Odestheory12

12:47 PM

Hello.

I have a question with the following problem:

"A platform of M kg moves with a velocity of 2 m/s on straight horizontal rails without friction. On the platform, and at rest relative to it, an elastic spring of negligible mass and a spring constant of 1000 N/m is arranged in the direction of motion, initially compressed by 20 cm, and two bodies, attached to the spring, one at each end, of masses m1 and m2 kg, respectively. At a certain moment, the spring is released, causing both bodies to start moving on the platform in opposite directions, being shot off. Assuming no frictional forces exi…