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title: "Reality Is Not What It Seems: The Journey to Quantum Gravity"
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# Reality Is Not What It Seems: The Journey to Quantum Gravity

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“The man who makes physics sexy . . . the scientist they’re calling the next Stephen Hawking.” — The Times Magazine From the New York Times –bestselling author of Seven Brief Lessons on Physics , The Order of Time , and the forthcoming Helgoland , a closer look at the mind-bending nature of the universe. What are the elementary ingredients of the world? Do time and space exist? And what exactly is reality? In elegant and accessible prose, theoretical physicist Carlo Rovelli leads us on a wondrous journey from Democritus to Einstein, from Michael Faraday to gravitational waves, and from classical physics to his own work in quantum gravity. As he shows us how the idea of reality has evolved over time, Rovelli offers deeper explanations of the theories he introduced so concisely in Seven Brief Lessons on Physics . Rovelli invites us to imagine a marvelous world where space breaks up into tiny grains, time disappears at the smallest scales, and black holes are waiting to explode—a vast universe still largely undiscovered.

Review: Quantum Leap in Clarity - I read Carlo Rovelli’s book about quantum gravity (for the first time, it will take me a few goes, at least, to get all that is in it.) He is quite a good writer and this book, like his seven lessons in physics, is clear and extremely literate (I imagine he wrote it in Italian, but the English is smooth and demotic and lucid. It is a pleasure to read, which is not the norm in books that try to explain physics to non-specialists; God help the guy who tries to read the specialist literature. After a review from Democritus to Einstein et al, he gives us three big conclusions. At the smallest level, the universe is granular, relational, and indeterminate. He makes some other amazing statements like that ‘time’ disappears at this level and that things only exist when they collide into each other (or as ‘events’ as he puts it.) I have a notion about these other statements, but I have to determine if I understand the big three first. Everything (like Democritus and Feynman told us) is made of “atoms” or actually irreducible ‘quanta.’ Each of which is a unit of stuff that cannot be further divided; matter is not infinitely divisible (NB; big point.) Eventually, you get to a tight-pack of Plank scale bits of somethingness that all fit together. They in their constellation are gravity, space, and at bottom, everything else. There is no overarching, organizing anything outside these quanta. Time is absolutely a characteristic of the situation of the observer and the variable being measured “in” or as “time;” it measures differently at different altitudes and in different circumstances of proximity to matter and because of other factors. There are times all over the place and they do not generalize. At the level of the granular quanta, it disappears as a factor entirely. The stuff of the universe is not strictly determined in terms of how things interact and the results of any given intervention in it. We can pretty much depend on certain things happening as if by cause and effect on the macro level, but on the basic level, you get all kinds of stuff going on that is not absolutely predictable based on the setting conditions. This is the quantum probability/uncertainty thing, but it has to be understood in one of two ways; either it means our tools or our theory is inadequate and we don’t understand what is going on entirely, or the way the universe works is not determined by rules associated with forces, etc., and compatible with mathematics but instead things do their own thing, which usually results in rule governed outcomes, but doesn’t always. I am here confronted with the issue of the void that keeps on giving me a problem; there is no such thing as nothing and stuff cannot move around in it. Nothing cannot function either as a nominative, nor accusative, nor prepositional object in a sentence relating to stuff that exists except insofar as it is used to designate and absence that serves no purpose (e.g. “nothing happened,” or “you know nothing,” or “it is surrounded by nothing,” none of which are statements to be taken literally.) Therefore, matter cannot be conceptualized as floating around or moving in nothing or a ‘void’ (which is either nothing something and cannot function as both.) Democritus knew this right at the start; “space” he explained both is and isn’t nothing. He was just being gnomic and communicating that his atomic theory needed more work. If that is so, and how can you say anything else and be sane? Then certain conclusions follow. The quanta, for example, that make up everything are the whole show. There is nothing else in the cosmos but them, configured as they be. They are not in nothing (the statement doesn’t mean anything.) Nor are they in ‘space’ since they are space. They are not held together by gravity because they are gravity. More to the point, they are not held together by gravity because they are not “held together” at all. Since there is only these quanta irreducible and adhesive upon each other, they relate to no other cohesive force, they just are together with nowhere else to go. That means the quanta do not move; they cannot. There would have to be some medium of environment into which they could go and there isn’t anything but they themselves. They are irreducible so they cannot split into smaller chunks to let others slither through them. Since there is nothing but them, they have no interstices; there isn’t anything else in the cosmos that could come between them. Thus, you have inseparable grains and nothing else and these grains are where they are in relation to each other, but there is no force or principle or anything else that affects them all, like time or gravity or space or motion. They are not determined by any law or cause or force because no such thing exists outside of them (I am deliberately repetitious because the notion blows my mind.) For that reason, the prediction of occurrences among them is hit or miss. This is the part the author doesn’t exactly state, but if I am following him, the cosmos works something like this: There is no Aristotelian/Newtonian ‘time’ at the level of the quanta, but they configure according to the warped, curved, four-dimensional morphology of space-time. That is to say the that way the quanta fit together is not only according to the three axes of a prism, but also in relationships of sequence within the prism’s extension. That means that the entirety of the universe, including what we call past and present and future exists with all the quanta co-existent in all parts of space-time. Should this be the state of play of the cosmos, and I believe it is both in general relativity and in Rovelli’s construction (he calls it “loop” theory to distinguish it from the feckless “string” theory he deprecates) then, there is no determinacy or any causes or effects or any changes at all; just all the bits configured exactly how they are and the positions they have relative to each other and the observer are not caused by anything but just are. So, the discoveries of things are like looking at a map of twelve inches by six inches but only being able to see it a centimeter at a time from the left-hand margin. You guess what is coming in the next centimeter(s) based on what you already have seen of the terrain on the map, but a sink-hole or an inexplicable mountain peak can turn up on the map that relates to nothing else on the landscape, it is just there. The cosmos is like that; things don’t pop in and out of existence; the quanta that are there are just the quanta that are there, the observer has inferred the quark or electron out of stuff that he saw in one part of the map, but it isn’t to be inferred as in the next slice because the (existing) configuration of space-time just isn’t like that. The notion that only events exist is basically pretty anthropomorphic if you ask me, almost solipsistic. You only measure something by looking at it, which is a kind of collision. Since you cannot talk about things you cannot measure, only measured things exist according to this view. I think we can stretch and hazard that stuff exists even when not being measured, but I think the point is precious and not all that interesting. Change is something the observer infers when he looks over the cosmos along a sequence of space-time and mistakes the irreducible quanta, each of which is a grain that extends the Plank scale in ALL FOUR dimensions, as continuous, surviving unities across time. Parmenides knew this. Goedel understood this too, which is why he said that time travel is not a silly idea. As Einstein said, all parts of the cosmos are always available to the observer. They are all co-existent, which means they are all made of different stuff. Continuity is mental construction of the imaginative observer. (You can ask Descartes how the observer arises from these quanta and you will get an answer no more satisfactory than one I can give you, but consciousness is no more extraordinary than any of the rest of this stuff.) If I am right, and this is what the professor is saying, then what a great book since it made something quite clear to me that I had not understood hitherto. If I misunderstood it all (like I usually do) then I cannot blame him, and I still really enjoyed the book.
Review: Loop Quantum Gravity delivered in Hawking's lucid science writing style - This book offers an exceptionally clear presentation of Loop Quantum Gravity(LQG) by one of its founding proponent Carlo Rovelli. It is written in Hawking style of lucid and engaging prose. It was a pleasurable read, which is a science writing achievement for a very unintuitive theory requiring you to do away with space time. The idea of doing away with space and time is probably the hardest thing for the reader to comprehend, but Rovelli did a stellar job of leading his readers through. Similar to many science books that explains a new theory, the author recaps a history of physics that has bearing to his project. Rovelli begins with Anaximander, Democritus, Plato, Aristotle, Archimedes to Newton and Einstein in part one of the book. It is delightful reading. But if you don't want to get through all that history again, you can start from part II beginning with general relativity and quantum mechanics. It is advisable to read through his relational view of Quantum mechanics because his LQG uses a relational view of reality. Rovelli sees quantum mechanics as describing quantum states of "interacting particles" (only a relationship, not as strong as entanglement). Quantum state arises from particle interacting with each other. He also sees information of quantum states as finite. The presentation of LQG is between chapter 5 to 7. LQG suggests space is made up of quanta of gravitational field. So quanta is more fundamental than space. The quanta is a node that can connect to another node or quanta by links or field lines. In LQG, space is replaced by quanta of gravitational field in a granular structure. A graph which represents how the quantas of gravitational field are connected is a spin network. This spin network is what space consists in. Not only is space is replaced. Time is also replaced by variables of activity such as heart beat, pulse, or pendulum swing. The notion of time flows by itself is less useful than noticing passage of activities such as beat or pendulum swing instantiating in the real world. Activities in the universe is more direct measure of the passage of reality. Using quanta of gravity and variables of activity, LQG presents a new representation of reality using gravity and quantum mechanics to replace space-time. When quantum mechanics is involved, events instantiate under probability and actual quantum event fluctuations. Reality is hence once again contingent upon relation of activities. Rovelli further presents the application of LQG by using it to study black holes. Heat dissipated in Hawking Radiation can be studied by the spin network that describes the gravitational field on the horizon of the black hole. Another use of LQG is to assess the black hole collapse. Quantum fluctuation and repulsion prevent collapsing to infinite pressure but offers it to bounce out. This approach is brought over to modeling the Big Bang suggesting that the initial explosion to be a big bounce from quantum fluctuation, not unlike the negative potential of Linde and Vilenkin inflation model. This book brings the reader through a journey to reconceptialise their reality in quanta of gravity, spin network and spin foam. It is conceptually challenging but Rovelli's lucid and engaging narrative made it fun and worthwhile.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Best Sellers Rank | #32,681 in Books ( See Top 100 in Books ) #2 in Waves & Wave Mechanics (Books) #4 in Physics of Gravity (Books) #12 in Quantum Theory (Books) |
| Customer Reviews | 4.6 out of 5 stars 4,733 Reviews |

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## Customer Reviews

### ⭐⭐⭐⭐⭐ Quantum Leap in Clarity
*by F***N on May 28, 2018*

I read Carlo Rovelli’s book about quantum gravity (for the first time, it will take me a few goes, at least, to get all that is in it.) He is quite a good writer and this book, like his seven lessons in physics, is clear and extremely literate (I imagine he wrote it in Italian, but the English is smooth and demotic and lucid. It is a pleasure to read, which is not the norm in books that try to explain physics to non-specialists; God help the guy who tries to read the specialist literature. After a review from Democritus to Einstein et al, he gives us three big conclusions. At the smallest level, the universe is granular, relational, and indeterminate. He makes some other amazing statements like that ‘time’ disappears at this level and that things only exist when they collide into each other (or as ‘events’ as he puts it.) I have a notion about these other statements, but I have to determine if I understand the big three first. Everything (like Democritus and Feynman told us) is made of “atoms” or actually irreducible ‘quanta.’ Each of which is a unit of stuff that cannot be further divided; matter is not infinitely divisible (NB; big point.) Eventually, you get to a tight-pack of Plank scale bits of somethingness that all fit together. They in their constellation are gravity, space, and at bottom, everything else. There is no overarching, organizing anything outside these quanta. Time is absolutely a characteristic of the situation of the observer and the variable being measured “in” or as “time;” it measures differently at different altitudes and in different circumstances of proximity to matter and because of other factors. There are times all over the place and they do not generalize. At the level of the granular quanta, it disappears as a factor entirely. The stuff of the universe is not strictly determined in terms of how things interact and the results of any given intervention in it. We can pretty much depend on certain things happening as if by cause and effect on the macro level, but on the basic level, you get all kinds of stuff going on that is not absolutely predictable based on the setting conditions. This is the quantum probability/uncertainty thing, but it has to be understood in one of two ways; either it means our tools or our theory is inadequate and we don’t understand what is going on entirely, or the way the universe works is not determined by rules associated with forces, etc., and compatible with mathematics but instead things do their own thing, which usually results in rule governed outcomes, but doesn’t always. I am here confronted with the issue of the void that keeps on giving me a problem; there is no such thing as nothing and stuff cannot move around in it. Nothing cannot function either as a nominative, nor accusative, nor prepositional object in a sentence relating to stuff that exists except insofar as it is used to designate and absence that serves no purpose (e.g. “nothing happened,” or “you know nothing,” or “it is surrounded by nothing,” none of which are statements to be taken literally.) Therefore, matter cannot be conceptualized as floating around or moving in nothing or a ‘void’ (which is either nothing something and cannot function as both.) Democritus knew this right at the start; “space” he explained both is and isn’t nothing. He was just being gnomic and communicating that his atomic theory needed more work. If that is so, and how can you say anything else and be sane? Then certain conclusions follow. The quanta, for example, that make up everything are the whole show. There is nothing else in the cosmos but them, configured as they be. They are not in nothing (the statement doesn’t mean anything.) Nor are they in ‘space’ since they are space. They are not held together by gravity because they are gravity. More to the point, they are not held together by gravity because they are not “held together” at all. Since there is only these quanta irreducible and adhesive upon each other, they relate to no other cohesive force, they just are together with nowhere else to go. That means the quanta do not move; they cannot. There would have to be some medium of environment into which they could go and there isn’t anything but they themselves. They are irreducible so they cannot split into smaller chunks to let others slither through them. Since there is nothing but them, they have no interstices; there isn’t anything else in the cosmos that could come between them. Thus, you have inseparable grains and nothing else and these grains are where they are in relation to each other, but there is no force or principle or anything else that affects them all, like time or gravity or space or motion. They are not determined by any law or cause or force because no such thing exists outside of them (I am deliberately repetitious because the notion blows my mind.) For that reason, the prediction of occurrences among them is hit or miss. This is the part the author doesn’t exactly state, but if I am following him, the cosmos works something like this: There is no Aristotelian/Newtonian ‘time’ at the level of the quanta, but they configure according to the warped, curved, four-dimensional morphology of space-time. That is to say the that way the quanta fit together is not only according to the three axes of a prism, but also in relationships of sequence within the prism’s extension. That means that the entirety of the universe, including what we call past and present and future exists with all the quanta co-existent in all parts of space-time. Should this be the state of play of the cosmos, and I believe it is both in general relativity and in Rovelli’s construction (he calls it “loop” theory to distinguish it from the feckless “string” theory he deprecates) then, there is no determinacy or any causes or effects or any changes at all; just all the bits configured exactly how they are and the positions they have relative to each other and the observer are not caused by anything but just are. So, the discoveries of things are like looking at a map of twelve inches by six inches but only being able to see it a centimeter at a time from the left-hand margin. You guess what is coming in the next centimeter(s) based on what you already have seen of the terrain on the map, but a sink-hole or an inexplicable mountain peak can turn up on the map that relates to nothing else on the landscape, it is just there. The cosmos is like that; things don’t pop in and out of existence; the quanta that are there are just the quanta that are there, the observer has inferred the quark or electron out of stuff that he saw in one part of the map, but it isn’t to be inferred as in the next slice because the (existing) configuration of space-time just isn’t like that. The notion that only events exist is basically pretty anthropomorphic if you ask me, almost solipsistic. You only measure something by looking at it, which is a kind of collision. Since you cannot talk about things you cannot measure, only measured things exist according to this view. I think we can stretch and hazard that stuff exists even when not being measured, but I think the point is precious and not all that interesting. Change is something the observer infers when he looks over the cosmos along a sequence of space-time and mistakes the irreducible quanta, each of which is a grain that extends the Plank scale in ALL FOUR dimensions, as continuous, surviving unities across time. Parmenides knew this. Goedel understood this too, which is why he said that time travel is not a silly idea. As Einstein said, all parts of the cosmos are always available to the observer. They are all co-existent, which means they are all made of different stuff. Continuity is mental construction of the imaginative observer. (You can ask Descartes how the observer arises from these quanta and you will get an answer no more satisfactory than one I can give you, but consciousness is no more extraordinary than any of the rest of this stuff.) If I am right, and this is what the professor is saying, then what a great book since it made something quite clear to me that I had not understood hitherto. If I misunderstood it all (like I usually do) then I cannot blame him, and I still really enjoyed the book.

### ⭐⭐⭐⭐ Loop Quantum Gravity delivered in Hawking's lucid science writing style
*by P***E on August 26, 2023*

This book offers an exceptionally clear presentation of Loop Quantum Gravity(LQG) by one of its founding proponent Carlo Rovelli. It is written in Hawking style of lucid and engaging prose. It was a pleasurable read, which is a science writing achievement for a very unintuitive theory requiring you to do away with space time. The idea of doing away with space and time is probably the hardest thing for the reader to comprehend, but Rovelli did a stellar job of leading his readers through. Similar to many science books that explains a new theory, the author recaps a history of physics that has bearing to his project. Rovelli begins with Anaximander, Democritus, Plato, Aristotle, Archimedes to Newton and Einstein in part one of the book. It is delightful reading. But if you don't want to get through all that history again, you can start from part II beginning with general relativity and quantum mechanics. It is advisable to read through his relational view of Quantum mechanics because his LQG uses a relational view of reality. Rovelli sees quantum mechanics as describing quantum states of "interacting particles" (only a relationship, not as strong as entanglement). Quantum state arises from particle interacting with each other. He also sees information of quantum states as finite. The presentation of LQG is between chapter 5 to 7. LQG suggests space is made up of quanta of gravitational field. So quanta is more fundamental than space. The quanta is a node that can connect to another node or quanta by links or field lines. In LQG, space is replaced by quanta of gravitational field in a granular structure. A graph which represents how the quantas of gravitational field are connected is a spin network. This spin network is what space consists in. Not only is space is replaced. Time is also replaced by variables of activity such as heart beat, pulse, or pendulum swing. The notion of time flows by itself is less useful than noticing passage of activities such as beat or pendulum swing instantiating in the real world. Activities in the universe is more direct measure of the passage of reality. Using quanta of gravity and variables of activity, LQG presents a new representation of reality using gravity and quantum mechanics to replace space-time. When quantum mechanics is involved, events instantiate under probability and actual quantum event fluctuations. Reality is hence once again contingent upon relation of activities. Rovelli further presents the application of LQG by using it to study black holes. Heat dissipated in Hawking Radiation can be studied by the spin network that describes the gravitational field on the horizon of the black hole. Another use of LQG is to assess the black hole collapse. Quantum fluctuation and repulsion prevent collapsing to infinite pressure but offers it to bounce out. This approach is brought over to modeling the Big Bang suggesting that the initial explosion to be a big bounce from quantum fluctuation, not unlike the negative potential of Linde and Vilenkin inflation model. This book brings the reader through a journey to reconceptialise their reality in quanta of gravity, spin network and spin foam. It is conceptually challenging but Rovelli's lucid and engaging narrative made it fun and worthwhile.

### ⭐⭐⭐⭐⭐ Poetic
*by E***A on October 8, 2023*

This is the third book I read by Carlo Rovelli. He is a poet of cosmology. The words on the page flow together like the glorious Colorado river. I consume his books much like I consume an outdoor adventure; it’s exhilarating. I finish each book thinking I am ready to change careers and work in the field of theoretical physics. This book handles the history of cosmological thought and development as though it was elementary science. Granted, the book does not work through the mathematical formulas, and that permits the reader to focus on the concepts of gravity, space and time, spacetime, fields, probabilities, and spin foams - a daunting task without the math. But the author has a command of the concepts, the terminology, and the historical development. He marshals the words on the page like Caesar marshaled his troops to victory at the Battle of Alesia. A well intentioned reader with some basic understanding of physics - particularly if reading this author in order of publication - will finish the book with a broader and deeper understanding of our physical world. But I confess that the author always ends his books with a pointed attack. The author is an atheist - serenely atheist - as he described. In fact, the last chapter of each of his books express the serenity he experiences as an atheist. He at times outright attacks the concepts of religion or metaphysics in general. In this book, he refers to the immortality of the soul as nonsense. And curiously, the author’s scientific rigor disappears when discussing anything metaphysical. And some statements bear a deep animosity to the Catholic Church, which I think is based on an improper judgement that the Church is anti-science. In summary, the author continues to fail to convince me that a person cannot wield both a sincere appreciation and thorough understanding of the physical world and a sincere appreciation and understanding of that which is metaphysical. Nonetheless, the next book by Carlo Rovelli beckons.

## Frequently Bought Together

- Reality Is Not What It Seems: The Journey to Quantum Gravity
- The Order of Time
- Seven Brief Lessons on Physics

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