Hossenfelder's beautiful idea resolves QG/QFT tension

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Hossenfelder proposes a novel approach to reconcile quantum gravity (QG) and quantum field theory (QFT) by suggesting that gravity can be perturbatively quantized at low energies, while decoupling from matter fields at energies above the Planck scale. This is achieved by treating Planck's constant as a field that undergoes symmetry breaking, allowing for a transition from classical to quantum behavior. The discussion highlights the potential for this theory to yield practical predictions and its resemblance to past ideas in quantum mechanics. However, concerns are raised about the ad hoc nature of the proposed commutation relations and the implications for high-energy states not in thermodynamic equilibrium. Overall, the idea is seen as a promising yet challenging step towards unifying gravity with quantum mechanics.
  • #31
What exactly are the consequences of [STRIKE]h[/STRIKE] going to zero at high energies?
 
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  • #32
Berlin said:
If at high energies h --> 0 it would also mean that the big bang would consist of a near classical bose gas of spin-0 particles without Pauli exclusion.
This suggests another argument against the hossi's proposal. If at high energies quantum fluctuations vanish, then the early inflationary phase of the Universe expansion cannot explain the primordial density fluctuations, which are needed to explain the observed inhomogenities in the spectrum of cosmic microwave background.
 
  • #33
Berlin said:
But what would happen with the fermi statistics kicking in? Could we calculate the pressure of a developing fermi gas, maybe mimicking inflation?
Fermi-Dirac statistics in the limit h->0 is still a Fermi-Dirac statistics. This limit does not turn the anti-commutator into a commutator.
 

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