AT1 - Extended Theories of Gravity and Quantum Cosmology |
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Speaker |
Becattini, Francesco |
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Coauthors |
E. Grossi |
| Talk Title |
Quantum corrections to the stress-energy tensor in thermodynamic equilibrium with acceleration |
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Abstract |
We show that the stress-energy tensor has additional terms with respect to the ideal form in states of global thermodynamic equilibrium in flat spacetime with non-vanishing acceleration and vorticity. These corrections are of quantum origin and their leading terms are of second order in the gradients of the thermodynamic fields. We find that all thermodynamic functions including energy density receive acceleration and vorticity dependent corrections, including the relation between $\rho$ and $p$, that is the equation of state. We have calculated the corrections for a free real scalar field -- both massive and massless -- and we have found that they increase, particularly for a massive field, at very high acceleration and vorticity and very low temperature. These non-ideal terms depend on the explicit form of the stress-energy operator, meaning that different stress-energy tensor of the scalar field -- canonical or improved -- are thermodynamically inequivalent. The extension of these results to curved spacetime and the possibility of generating an effective extended gravity theory is briefly addressed. |
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