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December 6, 2022

CATEGORY: Blog [back]
TOPIC: MCQST2021 | The universe as a quantum many-body system (Daniele Oriti) by Daniele Oriti [refresh]
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FQXi Administrator Josh Hoffman wrote on Mar. 25, 2022 @ 01:28 GMT
The universe as a quantum many-body system

Speaker: Daniele Oriti | LMU München & MCQST



Abstract

Several approaches to quantum gravity suggest that spacetime and geometry are emergent from non-spatiotemporal quantum structures. In some of them, the fundamental quantum entities admit (in some approximation) a simplicial geometric description and can be mapped to generalized tensor networks. This allows also for a primitive entanglement/geometry correspondence. I summarize this formulation of the universe as a quantum many-body system, these immediate consequences as well as more recent results about holographic behavior. Then, I suggest possible lines of further developments from this perspective. Finally, I discuss how the hydrodynamic description of the same system, treated as a quantum fluid, can be given a cosmological interpretation and present a number of recent results about the resulting effective cosmological dynamics, including the replacement of the big bang singularity with a quantum bounce and a late-time accelerated behavior reproducing a phantom-like dark energy from pure quantum gravity origin.



Keywords: #Consciousness #Intelligence #Oriti #Quantum #Quantum_Gravity

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