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String Theory and HUP 
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#1
May1204, 05:15 PM

P: 164

How does the heisenberg uncertainty principle work within string theory, considering that the strings's size is on the order of planck's constant?



#2
May1204, 08:21 PM

Emeritus
PF Gold
P: 8,147

It is important to note that what is actually quantized is the vibrations of the string (via the world sheet). In this case the "normal modes" of the vibrations appear as quantum simple harmonic oscillators, well known from basic quantum theory. And these obey the uncertainty principle.



#3
May1204, 08:28 PM

P: 915

How could we ever concieve of the differences in orbitals and their shape?



#4
May1304, 05:48 AM

P: 164

String Theory and HUP
The position and velocity of the string are not the position and velocity of the particle. Instead, as the string sweeps accross space, the worldhseet it forms looks like the familiar QM wavefunction of the particle, which then defined the position and momentum of the particle in accordance with QM and the HUP. Is this right or am I completely off here? 


#5
May1304, 09:33 AM

Emeritus
PF Gold
P: 8,147




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