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La natura dello spazio e del tempo. Come capire l'incomprensibile

4.07  ·  Rating details ·  894 Ratings  ·  43 Reviews
Einstein ha affermato una volta che la cosa più incomprensibile dell'universo è il fatto che esso sia comprensibile. Aveva ragione? La teoria dei quanti e la teoria della relatività possono essere combinate in un modello generale di spiegazione del mondo? Il concetto di quanti e quello di cosmo sono compatibili? Perché il tempo va avanti e non indietro? A domande così impo ...more
Paperback, Superbur scienza, 176 pages
Published February 2002 by Rizzoli (first published 1996)
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Mohamed al-Jamri
قرأت نصف هذا الكتاب فقط لأن النسخة المسموعة لدي لا تحتوي إلا على الأجزاء التي كتبها هوكنج بينما الأجزاء التي كتبها بنروز والجزء المشترك غير موجودة

لفت نظري في الكتاب في هو انتقاد هوكنج لنظرية الأوتار الفائقة وهو أمر أقرؤه له لأول مرة وإن كان نقدًا سريعًا في سطر واحد فإن كان لاذعًا حيث اختار عدم طرح النظرية لسببين الأول هو أنه لا توجد مشاهدات تؤيدها والثاني أنها غير واضحة أو جميلة رياضيًا.
May 07, 2008 rated it really liked it  ·  review of another edition
Recommends it for: students of physics
Considerably more technical than either Hawking or Penrose's lay material (A Brief History of Time etc.) If you're seeking an introduction to the controversy behind Hawking's quantum gravity speculations (Hawking radiation, the no-hair theorem) then this is a good start. Is quantum information lost in black hole evaporation? There are still no solid answers to the questions posed here.
albin james
Apr 30, 2015 rated it it was amazing  ·  review of another edition
Rows and flows of angel hair
And ice cream castles in the air
And feather canyons everywhere
I've looked at clouds that way

But now they only block the sun
They rain and snow on everyone
So many things I would have done
But clouds got in my way

I've looked at clouds from both sides now
From up and down, and still somehow
It's cloud illusions I recall
I really don't know clouds at all

Moons and Junes and Ferris wheels
The dizzy dancing way you feel
As every fairy tale comes real
I've looked at love that way

Caitee Nigro
Feb 28, 2014 rated it really liked it  ·  review of another edition
This book was recommended to me by a good friend a while back, who insisted I purchase my own copy because he couldn't stand to part - even temporarily - with his. So I did. Maybe a month later, co-author Sir Roger Penrose spoke at a local university and I was fortunate enough to see him, as well as have my very untouched copy of The Nature of Space and Time signed by him. Only recently did I read it, and I'd be lying if I said I could comprehend more than half on my own.
Reading this book, more
Artemis Fowl
Mar 27, 2015 rated it really liked it  ·  review of another edition
We can understand the cosmos ? Will we ever find a general pattern by which explain what surrounds us ? Relativity and modern quantum theory will never get to a unification ? Think about the cosmos in terms of how much is the right way ? Why time flows in only one direction ? Stephen Hawking and Roger Penrose have charged with the daunting task of being able to give some clarification and some certainty about questions of this magnitude by comparing their ideas and reflections on cosmology, quan ...more
Apr 27, 2011 rated it it was ok  ·  review of another edition
Some of this information is dated, which is to be expected reading it so long after it was written. I could follow most of the math, but was disappointed by the lack of variable definition. Penrose's writing was much more clear than Hawkings and I believe I'll search out some of his writing on the topic the next time I approach this subject.
Sarah Khalida
And all those mathematical equations and terms like Lagrangian and Eulers numbers which I learned in calculus back in undergrad emerged. A very technical read - I skimmed through most of it and highlighted the 'absorbable parts'. More Stephen Hawking in the future for me!
José Uría
Nov 17, 2016 rated it it was amazing  ·  review of another edition
Un libro sólo para especialistas. Repito, sólo para quienes tengan conocimientos de las matemáticas de la relatividad general y los fundamentos de la mecánica cuántica. No hace falta ser experto en gravedad cuántica para seguir las argumentaciones, ni mucho menos. De hecho, cuando Hawking habla para otros físicos es un divulgador de primera, capaz de presentar temas abstrusos de un modo claro y conciso, todo lo contrario que hace en sus nefastos libros de divulgación popular. Y Penrose saca much ...more
Oct 01, 2016 rated it liked it  ·  review of another edition
Interesting but extremely, extremely confusing.
Bryan Kornele
Feb 22, 2017 rated it really liked it  ·  review of another edition
Shelves: math-science, 2017
Way to much brain power needed to be a recreational read. Interesting and technical in spots.
Lance Schonberg
Up front: this book is not for everyone. I’m actually not certain it was for me. I haven’t really studied physics since the courses I took in the early 1990s in university. This was originally written a few years later, but assumes more than merely a rough knowledge of Relativity and Quantum mechanics – you actually need something more than just a basic introduction to really grasp what’s going on here.
But, armed with the internet, I persevered, more or less.
The science may be a bit dated, but s
Jun 12, 2011 rated it it was ok  ·  review of another edition
"Time is the fire in which we burn." Delmore Schwartz

"...time is a companion who goes with us on the journey and reminds us to cherish every moment, because it will never come again." Jean-Luc Picard

I found the information in this set of 3 lectures to be somewhat interesting but because I am not a student (or practitioner) of science I found it to be a bit too specific to the field of physics/quantum mechanics/advanced maths/etc. for my general interest.

That said, one big problem I have with thi
Oct 21, 2012 rated it liked it
E' difficile definire questo libro un libro di divulgazione. In realt� si tratta di una serie di lezioni (tre a testa pi� una discussione finale) in cui gli autori dimostrano le proprie teorie in merito alla natura dello spaziotempo attraverso lo studio delle singolarit� nell'ambito della meccanica quantistica e della relativit� generale. Per farlo fanno ampio uso di strumenti matematici molto complessi. Per comprendere appieno le dimostrazioni � necessaria una conoscenza specialistica di matema ...more
Hernan Garcia
Jan 08, 2017 rated it really liked it  ·  review of another edition
El libro en si es la transcripción de un debate que tuvieron Stephen Hawking y Roger Penrose en la Universidad de Cambridge en 1994.
Es una lectura muy difícil de digerir, donde aparecen constantemente términos muy específicos y herméticos de la ciencia dura.
Es una lectura muy recomendada para las personas que ya son avezadas en el tema, pero capaz que para los que quiere iniciarse en la lectura de esta clase de libros, seria preferible algo un poco mas accesible.
Jan 31, 2009 rated it did not like it  ·  review of another edition
I gave it a good college try, but was immediately swamped by the intense theoretical physics and deep mathematics involved. As a series of lectures between the two physicists as they voice disagreements about the nature of the universe, it was interesting to be a sort of fly on the wall, to see what these big brains talk about when the rest of us aren't around. On the other hand, they're discussing these things at their own level and not the level of a layman, so one might as well be a fly on th ...more
Sep 13, 2010 rated it liked it  ·  review of another edition
This is collection of essays is an argument between Hawking and Penrose about the origin and ultimate fate of the universe, plus some entropy notions about black holes. I will say this: Hawking throws equations out there like you flat out know what he's talking about. His disclaimer is that he assumes you know some math and quantum mechanics. The QM arguments were easy enough, and while I've seen some topology before, I wasn't hugely familiar with GR, so his essays were sometimes hard to follow. ...more
Hugo Rodrigues
Aug 27, 2012 rated it really liked it  ·  review of another edition
Este livro é um conjunto de ensaios escritos por Roger Penrose e provados (acabados) pelo Stephen Hawking, embora não concordem totalmente um com o outro, provaram que as singularidades(buracos- negros) resultam do colapso de um estrela (sol Gigante), um livro muito interessante...
Jun 04, 2011 rated it liked it  ·  review of another edition
As much as I enjoyed the concepts that were meticulously laid out in this book; it hurt to read. The book required a lot from the reader to understand and keep up with the complex theories, unless of course you brought along your PHD in experimental physics and cosmology, which I did not.
Jan 01, 2016 rated it it was ok  ·  review of another edition
Not good. Notes from a Cambridge series of lectures. Colloquium level for PhDs in Quantum Gravity and Cosmology. Terms are not explained. Equations are not explained. Familiarity with 4 spheres, deSitter spacetime, Euclideanization of spacetime is assumed.
I am not sure how some read this book, but as an undergrad physics student, all I could read are the first couple of pages before the 1st equations.
Gary Levin
Jul 23, 2012 rated it it was amazing  ·  review of another edition
Shelves: science
Yet another Great book by Stephen Hawking!
Extremely nice and clear book. It may be better especially if one knows well about the subject matter, as it is written more in debate format.
the 1st 10 pages are difficult to go through without a course in GR... the figures alone are frightfully intimidating...
Shane Hall
Not for the novice! While I was able to follow the broad points, the descriptive mathematics that comprise the majority of the work was well out of my league. Math textbook, here I come...
Brendan  McAuliffe
Too much advanced mathematics for me, but, it still all comes down to that stupid cat ~
Apr 23, 2008 rated it really liked it  ·  review of another edition
Shelves: read-in-the-past
Full of facts and impeccable research and theory. Reading it is a bit daunting. The language is complex and not very engaging, but there is no question that the material is sound.
May 01, 2016 rated it it was ok  ·  review of another edition
Very dificult
Akshat Tandon
Jan 17, 2014 rated it it was amazing  ·  review of another edition
I could never understand what's in there!
Jun 26, 2016 rated it it was amazing  ·  review of another edition
Shelves: español
En definitiva un libro recomendable para los curiosos de la física. No es sencilla su lectura y requiere conocimientos previos de algunos de los argumentos
No stars. I can't rate the book from which the only part I was able to understand was its introduction.
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Stephen William Hawking was born on 8 January 1942 in Oxford, England. His parents' house was in north London, but during the second world war Oxford was considered a safer place to have babies. When he was eight, his family moved to St Albans, a town about 20 miles north of London. At eleven Stephen went to St Albans School, and then on to University College, Oxford, his father's old college. Ste ...more
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“In a sense the debate between Penrose and Hawking is a continuation of that earlier argument, with Penrose playing the role of Einstein and Hawking that of Bohr.” 0 likes
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