Lecture 6

# Whats the total energy of the system energy is more

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Unformatted text preview: # ( x1 ) + "1\$ ( x 3 )"1# ( x 2 )" 2# ( x1 ) So without solving the Shrödinger equaIon for this enormous soluIon, the symmetrizaIon postulate provides it for free. What’s the total energy of the system? Energy is MORE POSITIVE! i.e. like a repulsive interacIon… Exchange forces •  We’ve just seen that when two idenIcal parIcles arise, their symmetry under exchange induces a kind of repulsive (fermions) force. If the parIcles are bosons, the force is aaracIve. •  This type of non ­Newtonian force is called an exchange force. •  Let’s look at an example that illustrates this (from Griﬃths): ! ( x1 , x2 ) = ! a ( x1 )! b ( x2 ) Composite two parIcle wave...
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## This document was uploaded on 02/04/2014.

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