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Reality is not what it seems: the journey to…

Reality is not what it seems: the journey to quantum gravity (2014)

by Carlo Rovelli

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151379,164 (4.33)6



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Intereting science but his philosophizing is extremely poor.
  plaris | Jun 4, 2017 |
a readable and enjoyable book that explores the world of physics string theory is now it's quantum gravity. reading it is escaping from our world into a new and exciting world ( )
  michaelbartley | Feb 18, 2017 |
A wonderful popularization, needing to be read by everyone with a claim to be an educated person. It greatly elaborates on the bestselling little _Seven Brief Lessons on Physics_. A sampling of the book's more surprising or controversial contentions: The first giant of science was Democritus, and Lucretius's _De Rerum Natura_ luckily relayed bits of his wisdom down to us through the dark ages (which were brought on by monotheistic religion). A forefront concept from special relativity is the "extended present" (the observer's inaccessible-elsewhere region). A forefront concept from general relativity is that space and the gravitational field are basically the same thing, It was Heisenberg and Dirac, not Schrödinger, who properly completed the formulation of quantum mechanics, which should be interpreted relationally. In the still-nascent theory known as loop quantum gravity, space consists of ultra-tiny "atoms" of volume joined in a "spin network", and these are the quanta of the gravitational field. Time does not separately exist at this level, but spacetime emerges as "spinfoam" from the internal interactions (including mergings and splittings) of the spin network. The answer to "What is everything made of?" is "covariant quantum fields".
  fpagan | Feb 4, 2017 |
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Tempo, spazio e materia appaiono generati da un pullulare di eventi quantistici elementari. Comprendere questa tessitura profonda della realtà è l’obiettivo della ricerca in gravità quantistica, la sfida della scienza contemporanea dove tutto il nostro sapere sulla natura viene rimesso in questione. Carlo Rovelli, uno dei principali protagonisti di questa avventura, conduce il lettore al cuore dell’indagine in modo semplice e avvincente. Racconta come sia cambiata la nostra immagine del mondo dall’Antichità alle scoperte più recenti: l’evaporazione dei buchi neri, l’Universo prima del big bang, la struttura granulare dello spazio, il ruolo dell’informazione e l’assenza del tempo in fisica fondamentale. L’autore disegna un vasto affresco della visione fisica del mondo, chiarisce il contenuto di teorie come la relatività generale e la meccanica quantistica, ci porta al bordo del sapere attuale e offre una versione originale e articolata delle principali questioni oggi aperte. Soprattutto, comunica il fascino di questa ricerca, la passione che la anima e la bellezza della nuova prospettiva sul mondo che la scienza svela ai nostri occhi.
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