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  Horizon thermodynamics in pregeometry

Sindoni, L. (2013). Horizon thermodynamics in pregeometry. Journal of Physics: Conference Series, 410: 012140.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-E9B4-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-E9B5-0
Genre: Conference Paper

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 Creators:
Sindoni, Lorenzo1, Author              
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1Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_67201              

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 Abstract: The discovery of the various thermodynamical aspects of classical gravity has led to a picture in which Einstein equations might be seen as an equation of state, relating the dynamics of null hypersurfaces to thermodynamic relations for a system at or close to equilibrium. The explanation of such a fact is expected to come from a complete theory of quantum gravity. In absence of it, I will use a pregeometric model of emergent gravity to discuss the role of Wheeler's boundary of a boundary principle in this specific problem. The goal is to show the relevance of the equilibration of the microscopic degrees of freedom in establishing the thermodynamical status of the semiclassical gravity limit, and how the equilibration of the system might lead to additional physical effects. The role of phase transitions (conjectured in certain combinatorial models proposed to define a quantum theory of gravity, namely tensor models and group field theories) will be also considered in this light, showing how criticality and deviations from it relate to these ideas.

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 Dates: 2013
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1088/1742-6596/410/1/012140
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Title: IC-MSQUARE 2012: International Conference on Mathematical Modelling in Physical Sciences
Place of Event: Budapest, Hungary
Start-/End Date: 2012-09-03 - 2012-09-07

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Title: Journal of Physics: Conference Series
Source Genre: Journal
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Publ. Info: Bristol : IOP Publ.
Pages: - Volume / Issue: 410 Sequence Number: 012140 Start / End Page: - Identifier: ISSN: 1742-6588
CoNE: /journals/resource/111097776606042