How Does Entanglement Build Spacetime? - Ronak Soni

Dr. F.C. Kohli Centre of Excellence
Perspectives in Mathematical Sciences
January 10-February 4, 2022
Wednesday, 2 February 2022, 14:00 IST
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Abstract
Entanglement is a characteristic feature of quantum systems, where different systems have an unreasonable amount of correlation with each other. Recent progress in string theory has brought forward the idea that spacetime -- the very concept of places and times -- is an emergent feature, dictated by entanglement. In other words, "entanglement builds spacetime." I will try to explain what this slogan means, and mention some recent work that aims to dig into the mechanisms behind this emergence --- showing in particular that spacetime is a coarse-grained description of microscopic entanglement.
About the speaker
Ronak Soni is a postdoctoral fellow at the Department of Applied Mathematics and Theoretical Physics (DAMTP) at the University of Cambridge. Ronak graduated with B.Sc. in Physics and Mathematics from CMI in 2012 and did his Ph.D. at Tata Institute of Fundamental Research (TIFR) under the supervision of Prof. Sandip Trivedi. He went to hold a postdoctoral position at Stanford University before moving to Cambridge late last year.
Ronak's primary research interests lie in String theory and Quantum Gravity. His recent work has focussed on the gauge-gravity duality and understanding the interplay of geometry and entanglement.

[@vanikaghajanyan7760]

The starting point of physics is the idea of inertia, but "The knowledge of the straightness of the movement of a body left to itself does not follow from experience. On the contrary!" (Einstein). The fundamental difference between inertia forces and ordinary forces of interaction of bodies is that for inertia forces it is impossible to specify the action of which specific bodies on a material point they describe, they cannot be confused with the Dalembert force of inertia, and they are always external forces. (Newton's first law is not a special case of Newton's second law.) GR reduced gravity to inertia by generalizing the first law: the free movement of test bodies occurs along geodesic lines, but the theory did not find out anything new about the nature of the cause of inertia forces. "... the complete geometrization established by GR introduces a hierarchized cosmos on the plane, indicating indirectly the presence of an elusive source." (Tonnelat). It seems that this source of external (external) inertia forces is an "absolute vacuum" - instead of Newtonian "absolute space", which "... as a cause, does not satisfy the need for a causal explanation." (Born). Finally, the search for the root cause became possible after Friedmann spoke for the first time in a scientific way about the "creation of the world", and even then there was an opportunity to abandon the a priori nature of the law (more precisely, the axiom) of inertia, and build physics on a more reliable basis.
P.S. GR was QG: docs.google.com/document/d/1PKsO3vuXu7XJUhwjgpCR-a8Bwdi24B89QkE9RsKABOU/edit?usp=drivesdk

[@letsRegulateSociopaths]

redo this with decent sound.