Three Roads to Quantum Gravity

In summary, "Three Roads to Quantum Gravity" is a book by Lee Smolin that presents alternative ideas to string theory, particularly his approach known as loop quantum gravity (LQG). While Smolin's book "The Trouble with Physics" does not delve into LQG, this book offers more in-depth information and analysis on the subject. Some readers have compared it to Carlo Rovelli's book "Quantum Gravity" and find both to be valuable and insightful reads. Overall, "Three Roads to Quantum Gravity" provides a thoughtful and personal perspective on LQG and is highly recommended for those interested in the topic.
  • #1
Coin
566
1
"Three Roads to Quantum Gravity"

So some time back, before "The Trouble with Physics", Lee Smolin wrote a book called "Three Roads to Quantum Gravity". Is "Three Roads" any good? And does it go into any detail on how LQG works?

I find LQG a little while back, so I read Smolin's "The Trouble with Physics" because I heard alternatives to string theory were presented in it. "Trouble with Physics" was a very interesting book, but it didn't have much about LQG in it. Would I have maybe more luck with "Three Roads"?

In particular, is there anything Lee Smolin has written analogous to Rovelli's "Quantum Gravity" textbook, in the sense of just laying out Smolin's approach to LQG as he sees it? Or is the thing to do if one is interested in that to just read through Smolin's Arxiv entries...?

Thanks!
 
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  • #3
Coin said:
In particular, is there anything Lee Smolin has written analogous to Rovelli's "Quantum Gravity" textbook

I'm curious, what's wrong with Rovelli's book? and if you read it - what do you think?

I got this book myself not too long ago, and it's on my bed table and I've started to go through it. I haven't formed a definite opinon on his thinking and ideas yet. But the part that motivates me, is to see if analysing his ideas from my own view, can induce some new insights. But I like some of the parts I've read so far, so regardless of what I will think of this thinking after finishing this, it seems like a good quality book and I don't regret getting it. What i like is that he does some good generic reflections on the historical background, where he at least as it seem tries to keep it at a level where you don't get the impression that he is trying to "preach", and convince you with arbitrary logic. So I like it so far.

/Fredrik
 
  • #4
Fra said:
I'm curious, what's wrong with Rovelli's book? and if you read it - what do you think?

Hi,

I think Rovelli's book is fantastic, that's why I am looking around for more books like it :)

I got the chance to read the first part of Rovelli's book a little while back, I like how he kind of kept a balance between straightforward scientific discourse and just kind of sharing his thoughts on various subjects. The latter parts were very conversational and give you a surprisingly close and personal idea of Rovelli's thought processes, I thought, in a way you very rarely get in science literature. Unfortunately I got kind of lost in the mathematics of hamiltonians partway through the book... I at some point hope to go back and give the book another try, I think the part where I got stuck before (where he's providing a review of various traditional kinds of mechanics in physics) was mainly intended as just background anyway...

Demystifier, thank you for the link!
 
  • #5
Coin said:
I got the chance to read the first part of Rovelli's book a little while back, I like how he kind of kept a balance between straightforward scientific discourse and just kind of sharing his thoughts on various subjects. The latter parts were very conversational and give you a surprisingly close and personal idea of Rovelli's thought processes, I thought, in a way you very rarely get in science literature.

This impression seems to be somewhat in line with my impression, even though I have only started reading.

On parts of the initial analysis and reflection, I find rovelli's viewpoints very plausible. This is Rovelli's relational ideas, where I find his elaborations to be fairly sharp. But then in some other places, he seems to suggest that the results is not what I'd expect. He seems to reason differently that I would have expected, starting from premises which I share. I'm curious to see how his reasoning makes an unexpected connection between these views. I've got a feeling that his initial analysis is more clear than the later parts where he tries to take the topics to the next level. I'm excited to see how my view on this changes as I keep analysing the book.

/Fredrik
 
  • #6
Let me put my name on the list of Rovelli-and-his-book fans! :smile:
 
  • #8
Here is a post about QG books and other tips:

http://egregium.wordpress.com/2008/01/17/list-of-books-on-quantum-gravity-and-other-helpful-tips/ [Broken]

I hope it can be of some help into the LQG literature.Christine
 
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1. What is "Three Roads to Quantum Gravity"?

"Three Roads to Quantum Gravity" is a book written by physicist Lee Smolin that explores three different approaches to understanding the connections between quantum mechanics and gravity. The three roads are loop quantum gravity, string theory, and black hole thermodynamics.

2. Why is quantum gravity important?

Quantum gravity is important because it seeks to unify two of the most fundamental theories in physics: quantum mechanics and general relativity. These two theories have been highly successful in explaining the behavior of the smallest and largest structures in the universe, respectively, but they are fundamentally incompatible. A theory of quantum gravity would help us understand the universe on a deeper level and potentially resolve some of the biggest unanswered questions in physics.

3. What is loop quantum gravity?

Loop quantum gravity is one of the three approaches discussed in "Three Roads to Quantum Gravity". It is a theory that attempts to reconcile general relativity with the principles of quantum mechanics by quantizing space and time. In this theory, space is made up of tiny, discrete units called "loops", rather than being continuous as in general relativity.

4. How does string theory relate to quantum gravity?

String theory is another approach explored in "Three Roads to Quantum Gravity". It proposes that the fundamental building blocks of the universe are not particles, but tiny, vibrating strings. This theory attempts to unify the four fundamental forces of nature, including gravity, and has the potential to incorporate principles of quantum mechanics.

5. What is the black hole information paradox and how does it relate to quantum gravity?

The black hole information paradox is a problem in physics that arises from the combination of general relativity and quantum mechanics. It refers to the fact that according to general relativity, information (such as the properties of matter) can be lost inside a black hole, but quantum mechanics states that information cannot be destroyed. This paradox remains unsolved, but theories of quantum gravity, such as loop quantum gravity, aim to provide a solution.

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