The Time Machine Factory [unspeakable, speakable] on Time Travel - TMF2024

Session

Session VI. Information paradox and thermodynamics of gravity

25 Sept 2024, 14:35

Vallauri Hall (INRiM historical building, Turin)

Conveners

Session VI. Information paradox and thermodynamics of gravity

• José M.M. Senovilla (UPV/EHU)

84. Carroll black holes

Daniel Grumiller (TU Wien)

25/09/2024, 14:35

talk

Carroll symmetries arise generically on null hypersurfaces, such as black hole event horizons or null infinity in asymptotically flat spacetimes. Carroll gravity is a gravitational theory based on Carroll symmetries. Carroll black holes are solutions of Carroll gravity that exhibit Carroll thermal properties and have a Carroll extremal surface. I review, motivate, and explain all these notions...

79. Time machines, teleporters, and quasiregular singularities

Dr Justin Feng (CEICO, Institute of Physics of the Czech Academy of Sciences)

25/09/2024, 15:10

talk

In this talk, I review the Deutsch-Politzer spacetime, the related teleporter spacetime, and the quasiregular singularities necessarily present in such spacetimes. Such singularities, characterized by points with multiple future-directed and past-directed light cones, are generalizations of conical singularities and can reveal insights into topology change and the termination point of an...

82. The effect of gravitational energy on horizon thermodynamics

Marek Liška (Charles University, Prague)

25/09/2024, 16:05

talk

Thermodynamics of local causal horizons binds together gravity, quantum entanglement and the Unruh effect in a relatively simple setting. Moreover, it offers an elegant way to derive the equations governing the gravitational dynamics. A central role in this derivation is played by the causal structure of the spacetime and the equivalence principle(s). In my talk, I explore how the quasi-local...

97. Gravity and nonequilibrium thermodynamics: the origin of evolution equations

Máté Pszota (Eötvös University, Budapest, Hungary; HUN-REN Wigner RCP)

25/09/2024, 16:30

talk

An extension of standard nonequilibrium thermodynamics is presented, where the gravitational potential is a thermodynamic state variable, (P. Ván & S. Abe, Physica A 588 (2022) 126505). Then standard and rigorous methods of Rational Mechanics and nonequilibrium thermodynamic framework allow a set of evolution equations to be derived for the gravitational field and the derivation of...

90. OGRe and OGRePy: Object-Oriented General Relativity in Mathematica and Python

Barak Shoshany (Brock University)

25/09/2024, 16:55

talk

I will present a detailed introduction to my Mathematica package, [OGRe: (O)bject-Oriented (G)eneral (Re)lativity][1], and its Python port [OGRePy][2], both of which would be of great interest to anyone doing research in general relativity. I will demonstrate the package's usage and features, including its ability to calculate arbitrary tensor formulas involving any combination of addition,...