Another example of an emergent adiabatic force is the reaction force of a fast system
when it is inuenced by a slowly varying system. In the Born-Oppenheimer approximation
this force can be obtained by requiring that the phase space volume of all states with
energies below the given state remains constant. This leads to exactly a similar expression
as the entropic force in a thermodynamic situation. In this paper we will merge this
concept with that of an entropic force. A more detailed explanation of the connection
between adiabatic reaction forces with entropic forces, and the relevance for gravity, will
be explained in a future publication
http://link.springer.com/content/pdf/10.1007%2FJHEP04%282011%29029.pdf
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