Emergent Entropic Thermodynamic Force

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SUMMARY

The discussion centers on Robbert Dijkgraaf's lecture at Gresham College, which presents gravitation as an emergent entropic thermodynamic force. Key equations include F Δx = T ΔS, where F represents the emergent force, T is black body temperature, and S is thermodynamic entropy. The quantum thermodynamic constant is defined as C_1 = ħ / (2 π c k_B), with k_B being the Boltzmann constant. The integration leads to Newton's second law, F = mg, raising questions about the validity and context of these equations, particularly regarding the entropy's definition and dimensionality.

PREREQUISITES
  • Understanding of thermodynamic concepts, specifically entropy and temperature.
  • Familiarity with quantum mechanics, particularly the Boltzmann constant.
  • Knowledge of classical mechanics, especially Newton's laws.
  • Basic grasp of mathematical integration and substitution techniques.
NEXT STEPS
  • Research the implications of emergent gravity theories in modern physics.
  • Study the relationship between thermodynamics and quantum mechanics.
  • Examine the concept of black-body radiation and its relevance to thermodynamic temperature.
  • Explore advanced topics in entropy, particularly in relation to dimensional analysis in thermodynamics.
USEFUL FOR

Physicists, students of thermodynamics and quantum mechanics, and researchers exploring the intersection of gravity and thermodynamic principles will benefit from this discussion.

Orion1
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I have just watched a video lecture from Robbert Dijkgraaf at Gresham College where he describes gravitation as an emergent entropic thermodynamic force. The video link is listed in reference and the equations are defined at time index 44:00.

Emergent entropic thermodynamic force:
[tex]F \Delta x = T \Delta S[/tex]
Where F is emergent force and T is black body temperature and S is thermodynamic entropy.

Quantum thermodynamic constant:
[tex]C_1 = \frac{\hbar}{2 \pi c k_B}[/tex]
Where [itex]k_B[/itex] is Boltzmann constant.

Thermodynamic entropy:
[tex]\Delta S = \frac{m \Delta x}{C_1}[/tex]

Black-body thermodynamic temperature:
[tex]T = C_1 g[/tex]
Where g is surface gravity acceleration.

Integration via substitution:
[tex]F = \frac{T \Delta S}{\Delta x} = \left( \frac{C_1 g}{\Delta x} \right) \left( \frac{m \Delta x}{C_1} \right) = mg[/tex]

Newton's second law:
[tex]\boxed{F = mg}[/tex]

Is there any validity to these equations?

Reference:
The End of Space and Time? - Professor Robbert Dijkgraaf
 
Last edited:
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A few questions pop to mind:
What is S the entropy of? (this is very important since apparently 1-D thermodynamics is maybe being used to describe a 3D system here?)
Where do the third and fourth equations come from?

Without solid answers to these questions, no sensible conclusions can be made out of this string of math.

Hoping this helps:)
 

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