Zakopane Warszawa Time is a stratified notion Flows There are - - PowerPoint PPT Presentation

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Zakopane Warszawa Time is a stratified notion Flows There are - - PowerPoint PPT Presentation

May 14, 2023 241 likes •658 views

Zakopane Warszawa Time is a stratified notion Flows There are traces of the past, not future Past is different from future Time is unique The present is all over the universe All evolve in time Events happen. I. Time looses

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Warszawa Zakopane

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Time is a stratified notion

“Flows” There are traces of the past, not future Past is different from future Time is unique The present is all over the universe All evolve “in time” Events happen.

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  • I. Time looses pieces
  • II. The world without time
  • III. Recovering time, layer by layer
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  • I. Time looses pieces
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Warszawa Zakopane

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There is no single great clock that tics away the life

  • f the cosmos

Everybody dances at his own rhythm

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White hole Black hole

1 μs 10 billions years!

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Future Past

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Futuro Passato

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Futuro Passato

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  • II. The world without time
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An equation without time?

Gabcd δ δgab δ δgcd Ψ[g] − g R[g]Ψ[g] = 0

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Figura 7.7 Le equazioni della gravità quantistica a loop riassunte su una

Loop quantum gravity

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Doctors Galileo

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Things do not change "in time", they change one with respect to the other.

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Francesca Vidotto Loop Quantum Gravity

THE ONTOLOGY OF FUNDAMENTAL PHYSICS Descartes: Res extensa Time Newton: Bodies (particles) Space Time Special Relativity: Particles Fields Spacetime Quantum Mechanics: Quantum Fields Spacetime Faraday-Maxwell: Particles Fields Space Time Quantum Gravity: Covariant Quantum Fields General Relativity: Covariant Fields

  • ntology of fundamental physics
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→

Space time is granular, probabilistic, and relational.

Quantum gravity


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terra cielo

Spazio

sopra sotto

Cose T empo

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How does “time” come back?

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  • III. Recovering time, layer by layer
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Francesca Vidotto Loop Quantum Gravity

THE ONTOLOGY OF FUNDAMENTAL PHYSICS Descartes: Res extensa Time Newton: Bodies (particles) Space Time Special Relativity: Particles Fields Spacetime Quantum Mechanics: Quantum Fields Spacetime Faraday-Maxwell: Particles Fields Space Time Quantum Gravity: Covariant Quantum Fields General Relativity: Covariant Fields

  • ntology of fundamental physics
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Time has a direction

  • nly when there is heat

Heat is related to lack of detailed knowledge Time is our ignorance

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The source of the flow of time is probably in our own structure and our own perspective on the world.

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“We know the Earth turns, But we do not pay attention, the ground on which we walk does not appear to move, and we live in peace. So is time, in our life.” Marcel Proust

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Dal tempo degli angeli... … al tempo dei matematici ...

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Time is a stratified notion

“Flows” There are traces of the past, not future Past is different from future Time is unique Time is all over the universe All evolve “in time” Events happen. Because of the way our brain is wired Only because of thermodynamics Only in the context of incomplete information Only for small velocities Only if we disregard gravity Variables evolve with respect to one another Yes

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