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Universal temperature corrections to the free energy for the gravitational field
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Universal temperature corrections to the free energy for the gravitational field
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The temperature correction to the free energy of the gravitational field is considered which does not depend on the Planck energy physics. The leading correction may be interpreted in terms of the temperature dependent effective gravitational constant G_{eff}. The temperature correction to G_{eff}^{-1} appears to be valid for all temperatures T<< E_{Planck}. It is universal since it is determined only by the number of fermionic and bosonic fields with masses m<< T, does not contain the Planck energy scale E_{Planck} which determines the gravitational constant at T=0, and does not depend on whether or not the gravitational field obeys the Einstein equations. That is why this universal modification of the free energy for gravitational field can be used to study thermodynamics of quantum systems in condensed matter (such as quantum liquids superfluid 3He and 4He), where the effective gravity emerging for fermionic and/or bosonic quasiparticles in the low-energy corner is quite different from the Einstein gravity.
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Quantum and Classical mechanics vs QFT
Planck's constant is proposed as an emergent order parameter, making quantum mechanics the bridge between quantum field theory and classical mechanics.
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