How The Universe Got Its Spots: Diary Of A Finite Time In A Finite Space

Overview

Is the universe infinite or just really big? With this question, the gifted young cosmologist Janna Levin not only announces the central theme of her intriguing and controversial new book but establishes herself as one of the most direct and unorthodox voices in contemporary science. For even as she sets out to determine how big “really big” may be, Levin gives us an intimate look at the day-to-day life of a globe-trotting physicist, complete with jet lag and romantic ...
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Overview

Is the universe infinite or just really big? With this question, the gifted young cosmologist Janna Levin not only announces the central theme of her intriguing and controversial new book but establishes herself as one of the most direct and unorthodox voices in contemporary science. For even as she sets out to determine how big “really big” may be, Levin gives us an intimate look at the day-to-day life of a globe-trotting physicist, complete with jet lag and romantic disturbances.

Nimbly synthesizing geometry, topology, chaos and string theories, Levin shows how the pattern of hot and cold spots left over from the big bang may one day reveal the size and shape of the cosmos. She does so with such originality, lucidity—and even poetry—that How the Universe Got Its Spots becomes a thrilling and deeply personal communication between a scientist and the lay reader.

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Editorial Reviews

From Barnes & Noble
In a series of unsent letters to her mother, a theoretical physicist meditates on her life, examining how her work and her personal life both mesh with and obstruct each other. Taking a highly original approach to science writing, Levin reveals herself and her controversial new theory on the shape of the universe.
From the Publisher
“[Levin] covers … fascinating ground….She writes passages that may make you either feel claustrophobic for only living in three visible dimensions or see the night sky in an entirely new way.” —Baltimore City Paper

“Science as it is lived…. [Levin’s] book is a gift to those people who want to think big but came to a screeching halt about two dozen pages into… A Brief History of Time.—Discover

“Levin unpacks the technicalities with a skill honed from giving many lectures. . . . A book to be applauded.” — The Scotsman

“Lovely and utterly original. . . . Mixing lucid arguments with anecdotes and personal experiences, Levin makes it easy to understand seemingly complicated subjects such as transfinite arithmetic, naked singularities and compact spaces. . . . A marvelous diary that makes a reader long to meet the author. —American Scientist

John Lanchester
The focus of her work is the shape of the universe. This is unfinished business left over from Einstein's General Theory of Relativity, which describes the mechanism by which space is curved, but does not tell us what shape it is curved into. Levin doesn't claim to have the answer, but she does think that recent work in the field of topography has powerful suggestions about what the answer might be. She also thinks that the universe is finite, a minority view among physicists, and one whose implications she teases out with suggestiveness and skill.
Daily Telegraph
Astronomy Magazine
But once Levin arrives at her heart's theme - the shape of the universe and how we might soon measure it - the descriptions become models of enthusiasm and clarity. Juxtaposed to this element of public exposition is that of private confessional, whose alternative title could have been "The Loneliness of the Long-Distance Thinker."
Alejandro Gangui
Mixing lucid arguments with anecdotes and personal experiences, Levin makes it easy to understand seemingly complicated subjects such as transfinite arithmetic, naked singularities and compact spaces. She speaks of cosmic cacophony, Giacometti sculptures and intergalactic origami. Her descriptions allow the reader to hear the shape of a drum and to understand the struggles of cosmologists to see the shape of the universe.
American Scientist
New Yorker
If the universe is infinite, then its possibilities are infinite as well. But in How the Universe Got Its Spots the astrophysicist Janna Levin insists that infinity works as a hypothetical concept only, and that it is not found in nature. "Tormented," Levin writes of those who ponder the largest questions of existence, and she wonders whether such mental strain causes madness. The Pythagoreans drowned wayward members. Newton stabbed himself in the eye with a tiny dagger while staring at the sun. And Levin herself tries to grasp the finer points of astrophysics as she struggles with her relationship with a musician boyfriend whose temperament does not always match her own. Knowledge can bring alienation, but comfort and connection, too. She writes, "We often understand math when plain English simply isn't as useful."

When Alexander the Great met the Celts on the banks of the Danube in the fourth century B.C., he asked their chieftains what frightened them most. "We fear only that the sky will fall on our heads," Marcelo Gleiser relates in The Prophet and the Astronomer . Gleiser's book is a careful amalgam of philosophy, physics, and astronomy, tracing our contemplation of the cosmos from the big bang to the big crunch. "Time," Gleiser writes, "is the absence of perfection," and mortality creates a desire for knowledge. The search for answers to unknowable questions places the prophet and the physicist on the same side. Both Levin and Gleiser credit Einstein for his help in reframing our relationship to the sky: he theorized that space is curved, because time and space conform to accommodate the constant of the speed of light. As such, as long as time allows, we are drawn toward illumination. (Lauren Porcaro)

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Product Details

  • ISBN-13: 9781400032723
  • Publisher: Knopf Doubleday Publishing Group
  • Publication date: 8/12/2003
  • Edition description: First Anchor Books Edition
  • Edition number: 1
  • Pages: 240
  • Sales rank: 470,564
  • Product dimensions: 5.17 (w) x 8.00 (h) x 0.66 (d)

Meet the Author

Born in Texas and raised in Chicago, Janna Levin is now an Advanced Fellow in the Department of Applied Mathematics and Theoretical Physics at Cambridge University. She holds a Ph.D. from the Massachusetts Institute of Technology and worked previously at the Canadian Institute for Theoretical Astrophysics and the Center for Particle Astrophysics at the University of California, Berkeley.
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Read an Excerpt

Chapter 1

IS THE UNIVERSE INFINITE OR IS IT JUST REALLY BIG?

Some of the great mathematicians killed themselves. The lore is that their theories drove them mad, though I suspect they were just lonely, isolated by what they knew. Sometimes I feel the isolation. I'd like to describe what I can see from here, so you can look with me and ease the solitude, but I never feel like giving rousing speeches about billions of stars and the glory of the cosmos. When I can, I like to forget about math and grants and science and journals and research and heroes.

Boltzmann is the one I remember most and his student Ehrenfest. Over a century ago the Viennese-born mathematician Ludwig Boltzmann (1844-1906) invented statistical mechanics, a powerful description of atomic behavior based on probabilities. Opposition to his ideas was harsh and his moods were volatile. Despondent, fearing disintegration of his theories, he hanged himself in 1906. It wasn't his first suicide attempt, but it was his most successful. Paul Ehrenfest (1880-1933) killed himself nearly thirty years later. I looked at their photos today and searched their eyes for depression and desperation. I didn't see them written there.

My curiosity about the madness of some mathematicians is morbid but harmless. I wonder if alienation and brushes with insanity are occupational hazards. The first mathematician we remember encouraged seclusion. The mysterious Greek visionary Pythagoras (about 569 b.c.-about 475 b.c.) led a secretive, devout society fixated on numbers and triangles. His social order prospered in Italy millennia before labor would divide philosophy from science, mathematics from music. The Pythagoreans believed in the mystical meaning of numbers and developed a religion tending towards occult numerology. Their faith in the sanctity of numbers was shaken by their own perplexing mathematical discoveries. A Pythagorean who broke his vow of secrecy and exposed the enigma of numbers that the group had uncovered was drowned for his sins. Pythagoras killed himself, too. Persecution may have incited his suicide, from what little we know of a mostly lost history.

When I tell the stories of their suicide and mental illness, people always wonder if their fragility came from the nature of the knowledge-the knowledge of nature. I think rather that they went mad from rejection. Their mathematical obsessions were all-encompassing and yet ethereal. They needed their colleagues beyond needing their approval. To be spurned by their peers meant death of their ideas. They needed to encrypt the meaning in others' thoughts and be assured their ideas would be perpetuated.

I can only write about those we've recorded and celebrated, if posthumously. Some great geniuses will be forgotten because their work will be forgotten. A bunch of trees falling in a forest fearing they make no sound. Most of us feel the need to implant our ideas at the very least in others' memories so they don't expire when our own memories become inadequate. No one wants to be the tree falling in the forest. But we all risk the obscurity ushered by forgetfulness and indifference.

I admit I'm afraid sometimes that no one is listening. Many of our scientific publications, sometimes too formal or too obscure, are read by only a handful of people. I'm also guilty of a self-imposed separation. I know I've locked you out of my scientific life and it's where I spend most of my time. I know you don't want to be lectured with disciplined lessons on science. But I think you would want a sketch of the cosmos and our place in it. Do you want to know what I know? You're my last hope. I'm writing to you because I know you're curious but afraid to ask. Consider this a kind of diary from my social exile as a roaming scientist. An offering of little pieces of the little piece I have to offer.

I will make amends, start small, and answer a question you once asked me but I never answered. You asked me once: what's a universe? Or did you ask me: is a galaxy a universe? The great German philosopher and alleged obsessive Immanuel Kant (1724-1804) called them universes. All he could see of them were these smudges in the sky. I don't really know what he meant by calling them universes exactly, but it does conjure up an image of something vast and grand, and in spirit he was right. They are vast and grand, bright and brilliant, viciously crowded cities of stars. But universes they are not. They live in a universe, the same one as us. They go on galaxy after galaxy endlessly. Or do they? Is it endless? And here my troubles begin. This is my question. Is the universe infinite? And if the universe is finite, how can we make sense of a finite universe? When you asked me the question I thought I knew the answer: the universe is the whole thing. I'm only now beginning to realize the significance of the answer.

3 SEPTEMBER 1998

Warren keeps telling everyone we're going back to England, though, as you know, I never came from England. The decision is made. We're leaving California for England. Do I recount the move itself, the motivation, the decision? It doesn't matter why we moved, because the memory of why is paling with the wear. I do remember the yard sales on the steps of our place in San Francisco. All of my coveted stuff. My funny vinyl chairs and chrome tables, my wooden benches and chests of drawers. It's all gone. We sit out all day as the shade of the buildings is slowly invaded by the sun and we lean against the dirty steps with some reservation. Giant coffees come and go and we drink smoothies with bee pollen or super blue-green algae in homage to California as the neighborhood parades past and my pile of stuff shifts and shrinks and slowly disappears. We roll up the cash with excitement, though it is never very much.

When it gets too cold or too dark we pack up and go back inside. I'm trying to finish a technical paper and sort through my ideas on infinity. For a long time I believed the universe was infinite. Which is to say, I just never questioned this assumption that the universe was infinite. But if I had given the question more attention, maybe I would have realized sooner. The universe is the three-dimensional space we live in and the time we watch pass on our clocks. It is our north and south, our east and west, our up and down. Our past and future. As far as the eye can see there appears to be no bound to our three spatial dimensions and we have no expectation for an end to time. The universe is inhabited by giant clusters of galaxies, each galaxy a conglomerate of a billion or a trillion stars. The Milky Way, our galaxy, has an unfathomably dense core of millions of stars with beautiful arms, a skeleton of stars, spiraling out from this core. The earth lives out in the sparsely populated arms orbiting the sun, an ordinary star, with our planetary companions. Our humble solar system. Here we are. A small planet, an ordinary star, a huge cosmos. But we're alive and we're sentient. Pooling our efforts and passing our secrets from generation to generation, we've lifted ourselves off this blue and green water-soaked rock to throw our vision far beyond the limitations of our eyes.

The universe is full of galaxies and their stars. Probably, hopefully, there is other life out there and background light and maybe some ripples in space. There are bright objects and dark objects. Things we can see and things we can't. Things we know about and things we don't. All of it. This glut of ingredients could carry on in every direction forever. Never ending. Just when you think you've seen the last of them, there's another galaxy and beyond that one another infinite number of galaxies. No infinity has ever been observed in nature. Nor is infinity tolerated in a scientific theory-except we keep assuming the universe itself is infinite.

It wouldn't be so bad if Einstein hadn't taught us better. And here the ideas collide so I'll just pour them out unfiltered. Space is not just an abstract notion but a mutable, evolving field. It can begin and end, be born and die. Space is curved, it is a geometry, and our experience of gravity, the pull of the earth and our orbit around the sun, is just a free fall along the curves in space. From this huge insight people realized the universe must be expanding. The space between the galaxies is actually stretching even if the galaxies themselves were otherwise to stay put. The universe is growing, aging. And if it's expanding today, it must have been smaller once, in the sense that everything was once closer together, so close that everything was on top of each other, essentially in the same place, and before that it must not have been at all. The universe had a beginning. There was once nothing and now there is something. What sways me even more, if an ultimate theory of everything is found, a theory beyond Einstein's, then gravity and matter and energy are all ultimately different expressions of the same thing. We're all intrinsically of the same substance. The fabric of the universe is just a coherent weave from the same threads that make our bodies. How much more absurd it becomes to believe that the universe, space, and time could possibly be infinite when all of us are finite.

So this is what I'll tell you about from beginning to end. I've squeezed down all the facts into dense paragraphs, like the preliminary squeeze of an accordion. The subsequent filled notes will be sustained in later letters. You could say this is the story of the universe's topology, the branch of mathematics that governs finite spaces and an aspect of spacetime that Einstein overlooked. I don't know how this story will play itself out, but I'm curious to see how it goes. I'll try to tell you my reasons for believing the universe is finite, unpopular as they are in some scientific crowds, and why a few of us find ourselves at odds with the rest of our colleagues.

Chapter 2

INFINITY

14 SEPTEMBER 1998

I'm on the train back from London-gives me time to write, this time about Albert Einstein, hero worship, idolatry, and topology. Somebody told me he is reported to have said, "You know, I was no Einstein." He couldn't get a job. His dad wrote letters to famous scientists begging them to hire his unemployed son. They didn't. The Russian mathematician Hermann Minkowski (1864-1909) actually called him a "lazy dog." Can you imagine? He worked a day job as a patent clerk and thought about physics maybe all the rest of his waking hours. Or maybe the freedom from the criticism of his colleagues just gave his mind the room it needed to wander and let the truth hidden there reveal itself. In any case, in the early 1900s he developed his theory of relativity and published in 1905 a series of papers of such import and on such varied topics that when he received the Nobel prize it wasn't even for relativity.

Now we love him and his crazy hair and he's considered a genius. We try to make him the president of a small country. He's a hero. And he deserves to be. When I think of his vision, his revolution, it's an overwhelming testament to the human character, one of those rare moments of pride in my species. Nonetheless, we've been led astray by our faith in Einstein and his theory. General relativity, as I'll get to later, is a theory of geometry but it is an incomplete theory. It tells us how space is curved locally, but it is not able to distinguish geometries with different global properties. The global shape and connectedness of space is the realm of topology. A smooth sphere and a sphere with a hole in the middle have different topologies and general relativity is unable to discern one from the other. Because of this, people have assumed that the universe is infinite-seemed simpler than assuming space had handles and holes.

I liken this to assuming the earth is flat. I suppose it's simpler, but nonetheless wrong. If you think about it, it's not so much that Europeans thought the earth was flat. They knew there were hills and valleys, local curves. What they really feared was that it was unconnected. So much so that they imagined their countrymen sailing off its dangling edge. The resolution is even simpler. The earth is neither flat nor unconnected. It is finite and without edge (Figure 2.1).

It's easy to make fun of an ancient cosmology, but any child will conjure up their own tale about the sky and its quilt of lights. I had my own personal childhood cosmology. I fully expected that the earth was round, but I got a bit confused thinking that we lived inside the sphere. If I walked far enough from our backyard, I was certain I'd hit the arch of the blue sky. For some reason I thought our backyard was closer to the edge of the earth. In my childhood theory, there is a clear middle point on the surface of the earth. The real earth is so much more elegant. The earth is curved and smoothly connected. There is no edge, no middle. Each point is equivalent to every other.1

It is this and more that some cosmologists envisage for our entire universe: finite and edgeless, compact and connected. If we could tackle the cosmos in a spaceship, the way sailors crossed the globe, we might find ourselves back where we started.

Sometimes it's comforting, like defining a small and manageable neighborhood as your domain out of the vast urban sprawl. But today the image sits uncomfortably. A prison thirty billion light-years across.

Finally, the train's arrived. We're here. More soon.

15 SEPTEMBER 1998

Infinity is a demented concept. My mathematician collaborator scolded me for accusing infinity of being absurd. I think he'd be equally displeased with "demented," but these are my letters, my diary. I only voice his objection for the record.

Infinity is a limit and is not a proper number. No matter how big a number you think of, I can add 1 to it and make it that much bigger. The number of numbers is infinite. I could never recite the infinite numbers, since I only have a finite lifetime. But I can imagine it as a hypothetical possibility, as the inevitable limit of a never-ending sequence. The limit goes the other way, too, since I can consider the infinitely small, the infinitesimal. No matter how small you try to divide the number 1, I can divide it smaller still. While I could again imagine doing this forever, I can never do this in practice. But I can understand infinity abstractly and so accept it for what it is. Infinity has earned its own mathematical symbol: ƒ.

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Table of Contents

Acknowledgments ix
Preface xi
1 Is the Universe Infinite or Is It Just Really Big? 3
2 Infinity 8
3 Newton, 300 Years, and Einstein 20
4 Special Relativity 28
5 General Relativity 43
6 Quantum Chance and Choice 57
7 Death and Black Holes 71
8 Life and the Big Bang 88
9 Beyond Einstein 110
10 Adventures in Flatland and Hyperspace 115
11 Topology: Links, Locks, Loops 127
12 Through the Looking Glass 145
13 Wonderland in 3D 155
14 Mirrors in the Sky 166
15 How the Universe Got Its Spots 178
16 The Ultimate Prediction 196
17 Scars of Creation 203
18 The Shape of Things to Come 213
Epilogue 217
Index 219
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Interviews & Essays

A Conversation with Janna Levin, author of HOW THE UNIVERSE GOT ITS SPOTS

Q: What inspired you to write HOW THE UNIVERSE GOT ITS SPOTS as a series of letters to your mother?

A: In part, I didn't want to fall into an authoritative tone, the scientist coming down from the mountain and bringing knowledge to the masses. I didn't feel in a position to be so proud and I wanted to be natural, able to admit I didn't know things, and generally be human. It was easier to write home this way than it would have been to address a nonspecific audience and I guess it also gave me something to hold on to when the scientific life left me feeling dislocated.

Q: Why was your mother the perfect audience?

A: My mom's curious but not the least bit inclined to read a science book of any variety. And that's the audience I wanted to reach, more so than adolescent boys with chemistry sets in their basement—which is not to say that I don't appreciate the special charm of adolescent boys with chemistry sets in their basement. It's just that there are science books written for them already. There weren't any for my mom. I guess I wanted her to know what it was all about, why I had gone off in this seemingly intangible direction and why the gulf between me and those I was closest to had become so wide.

Q: Many famous mathematicians have suffered from mental illnesses. Are scientists really more crazy than every one else?

A: Maybe not. On close inspection most people are pretty crazy, no?

I definitely do not believe overt craziness is a prerequisite to being a great scientist, but, maybe a little insanity puts peopleoff center just enough so that they are less concerned with ordinary social norms, monetary gain, social status.

There are some brutal tales of desperation and isolation and delusion. Ancient Greeks drowned themselves when their discoveries defied their religious numerology. Cantor, the mathematician who first understood infinity, died in a sanatorium despondent and rejected. The brilliant statistician Boltzmann hung himself after a few less successful attempts at suicide. Many years later his greatest student, Eherenfest, killed himself. Turing, the indispensable code breaker and mathematician, ate an apple laced with cyanide and Gödel, the greatest logician possibly of all time, died paranoid and delusional.

Maybe those are the people most willing to spend their days and nights buried in obscure and difficult topics for very little money and probably no recognition ever. It seems heroically tragic and touching and wretched that such intellectual greatness, almost preternatural mental strengths, should be vulnerable to mental illness too.

Q: How can cosmology be relevant to the man (and woman) on the street?

A:
Before Copernicus we thought the Earth was at the center of the universe. It seems to have had a huge cultural impact to know that we're not at the center of the solar system, or the galaxy, or the universe. I suspect it changes everything from what we care about to what we believe in.

Q: How might Einstein react to your theories about infinity?

A: Einstein did say, “Only two things are infinite, the universe and human stupidity—and I'm not sure about the universe.”

Q: So, is the universe infinite or just really, really big?

A: I don't see why the universe should be different from any of its progeny. Nothing else in the universe is infinite, why should the universe itself be any different? The universe seems to have been born in something like a big bang. I don't like the idea that it was born instantaneously infinite. But in the end it's not up to me, it doesn't matter what I like or don't like. Ultimately it's nature's call and we really have to just look at the sky and see. To date, cosmological observations can't tell us conclusively the shape and size of the universe but some recent satellite data may show evidence of a limit to the extent of space and so has sparked renewed interest in a finite universe.

Q: Is the universe 3-dimentional?

A: It's quite possible that there are other dimensions than the 3 we freely occupy. String theory, which suggests that fundamental particles are not points but rather vibrating bits of fundamental string, is often cast in more than 3-dimensions. The reason for this is vaguely akin to the reasons why musical instruments are built to be a given shape and size, that is, in order to get the right notes. In order for fundamental Strings to play the right notes and create the universe we see, spacetime has to have a certain shape and size—and dimensionality. String theories can call for 10 or 27 dimensions, depending on the model, in order to play properly.

It might be a long time before we know if these theories are right or if we can ever observe the existence of extra dimensions. It may be that the extra dimensions are like the wrapped up direction of a straw and are just too small for us to notice or it might be that we're trapped on a 3-dimensional surface that floats in a higher-dimensional space.

Q: You didn't graduate from high school. If you could, would you do things differently?

A: Definitely, but not that. I think my options were to finish high school while polishing my belligerent, troubled teenager routine or to go to college in New York. Despite the appeal of petulant adolescence, it was a pretty easy decision. It was an easy decision for my parents too. After they fished me out of a car wreck in a local canal, bandaged me up and stuck a pen in my hand, I wrote an apparently convincing appeal to Barnard College to let me in. Some time ago I stopped worrying that someone would notice I had no high school diploma and initiate a series of retracted university degrees.

Q: What is your greatest achievement?

A: Getting up in the morning.

Q: How did writing this book affect your personal relationships?

A: Has it improved my sex life? I have had a couple of marriage proposals arrive through the post including Polaroids of perspective suitors variously posed, credentials and descriptions of hobbies. I'm keeping them on file just in case. Luckily no one's sent me their underwear.

Q: What's next for you? What's next for science?

A: The most outrageous creations of Einstein's theory of curved spacetime, black holes and the big bang, are still mysteries. To understand them we need to flush out a theory of Quantum Gravity, the overlap of physics on microscopic scales with physics on the vastest scales. Without Quantum Gravity our knowledge of the origin of the universe can only be sketchy at best. We know the universe began in something like a big bang, an energetic creation of not just matter but all space and the beginning of time. But the details are a fog. There are those who believe the answers are in fundamental strings and others who emphasize that space and time will come in discrete bundles or quanta. Some even argue that time doesn't fundamentally exist. Quantum Gravity will also tells us about the cores of black holes which can in some respects look like a big bang.

So, what's left for cosmologists to work on? The big bang, black holes, time machines, strings, all the cool stuff.
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  • Anonymous

    Posted April 21, 2002

    Cosmology for the amateur

    Beautifully written and captivating, Levin goes through a series of letters that teach us her view of the universe. And I say teach, because she goes through the repetitive details and analogies that good teachers use, so that we can understand her theories. She is honest in the collective uncertainty, but leaves us more informed, if equally ignorant. In the end, I was left as Warren, her former husband, yearning for more, amazed by her diaphanous intelligence, and shaken by the details of our universe.

    1 out of 1 people found this review helpful.

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