"Gravity Wells (Short Stories Collection)" - читать интересную книгу автора (Gardner James Alan)Kent State Descending the Gravity Well: An Analysis of the ObserverAccording to the Kerr-Newman model of a rotating black hole, there is a region just outside the event horizon where certain space and time vectors switch properties with each other. This is just mathematics, you understand, merely a quirk of the formulas—physically, nothing changes wildly until you get inside the black hole itself, and then who cares what happens? Double-deluxe chocolate-chip cookies could spontaneously spring into being and it wouldn't matter to the universe outside. Reality may break down inside a black hole, but the effects never percolate back into our familiar space. Just outside the black hole, however, if it's rotating, if the model is correct, there is a region called the ergosphere where certain vector fields describing the flow of space and time do a flip-flop. When I was trying to understand what this meant, I told myself that places became moments and moments became places. Think of that. Places became moments. Moments became places. Years and years ago, I did my master's thesis on black holes. In those days, I could have explained the math to you…but now I've forgotten it all. I look at the book containing my thesis and the only thing I remember is how hard it was to type all those equations. The meaning of the equations has dribbled out of my understanding a grain at a time, and now all I hold is this: just outside a spinning black hole, in a region called the ergosphere, places become moments and moments become places. Think of that. Kent State University entered the ergosphere at 12:24 P.M. on Monday, May 4, 1970. That was the moment the Ohio State National Guard opened fire on demonstrators protesting American involvement in Vietnam and Cambodia. Four students were killed; nine others were wounded. Kent State ceased to be a place and became a moment. Like Hiroshima. Like Chernobyl. Kent State fell off the map and became thirteen seconds of gunfire on a warm spring day. And maybe it kept dropping down the gravity well, from the ergosphere straight into the black hole. Here is an ugly truth: back in 1970, when I heard the news about the Kent State killings, I felt smug. I was fifteen years old. I was Canadian. It pleased me in a spiteful way that the U.S. had so blatantly screwed up. I was fifteen. I was self-righteous. I had never been to a funeral. The vectors that flip-flop in the ergosphere indicate symmetries in the gravitational field. One vector is timelike; it indicates that the laws of gravity don't change over time. The other vector is space-like; it describes the rotational symmetry of the black hole. These vectors are called Killing vectors. Really. They're named after a Professor Wilhelm K. J. Killing of the University of Münster. He gave his name to such geometrical objects in 1892, many decades before Kerr and Newman used them in their model of a rotating black hole. Killing vectors. May 4, 1990, was a Friday, but all the local newspapers saved their Kent State retrospectives for the weekend editions. I bought three papers that Saturday—the I didn't realize it was the twentieth anniversary of Kent State until I saw a commemorative article in the first paper I read. That article was written by a Kent State journalism student who happened to be in the right place at the right time to get the greatest news story of his life. The reporter told about his day: the rumors that something bad had happened at the noon rally, his race to get his camera, his sneaking through bushes to reach the parking lot where the killings took place, many details about the aftermath…but strangely, the reporter omitted any information about the victims themselves. He didn't even give their names. The article in the second paper talked about the effect of the killings on the American psyche. Was it really the turning point in the Vietnam War, the moment when public consciousness crossed some unerasable line? Or was it just another straw on the camel's bending back? The victims weren't named in this article either. Just four dead students. Four dead in O-hi-o. Kent State is about 270 kilometers from my living room. I've never been there; it feels like a very distant place. My wife's parents live more than 450 kilometers away. We visit them several times a year. It was only in the third paper that I found an actual list of who died. Four students, two women, two men: Allison Krause Jeff Miller Sandy Lee Scheuer Bill Schroeder This was the only information given about the victims: just their names. The article in the third paper was about the backroom machinations that made sure no charges were successfully laid against the National Guard. I sat in my living room, three thick newspapers on the floor around my chair, and I wondered why all three treated the victims as if they were irrelevant to the story. Certainly, the National Guard didn't specifically target those four students; the Guard could easily have killed four different people, or a dozen people, or none. But why should that matter? Randomness shouldn't mean irrelevance. The papers bypassed the reality of the victims, their lives, the grief of their friends and family, as if those things had nothing to do with the "real" story. As if the four dead students were only there for the body count. As if the students had no reality either before or after the shootings, but only in the moments when they lay bleeding on the pavement of a parking lot. You get the idea. Time travelers dropped onto the Kent State campus for the purpose of dying. Their deaths were necessary to shape the future properly—otherwise, opposition to the war in Vietnam wouldn't intensify fast enough and the future would go to hell. I could invent an appropriate description of such a hell if it became relevant. I wrote the above passage on Saturday, May 5, 1990. The notion that sparked the story was, of course, that the four Kent State students Partway through the writing, in the passage where McGregor scans the faces of the people waiting for the funeral run, I needed to know what the victims looked like. I made a quick trip to the library (only two blocks away), picked up three books on Kent State, and hurried back to the computer so I could keep writing. One of the books Conscience didn't set in till later. Look: the real students weren't terminal patients who nobly volunteered to die—they were simply people in the wrong place at the wrong time and they died by random chance. And they weren't just characters of convenience, devoid of families, people with no personality apart from what I might need in a story. At the end of a day of writing, I thumbed through those books from the library and I read interviews with parents, friends, people who had known the victims all their lives. The students didn't come out of nowhere—they came from homes and neighborhoods that mourned, prayed, lost sleep, wept, all trying to come to grips with grief. Reading those interviews I felt ashamed. Consider what an observer sees when an object descends into a black hole. For convenience, assume that the object is a burning candle that's somehow tough enough to withstand the tidal forces of gravity around the hole. As the candle falls, it takes longer and longer (from your point of view) for each particle of candlelight to climb the gravity well and reach your eye. Light particles emitted near the very edge of the black hole may take thousands of years to fight their way out to the universe at large. The result is that you perceive the candle falling for a potentially infinite length of time. Every now and then, another light particle struggles free of the black hole's pull and reminds you of the candle's descent. It's an obvious metaphor for grief. Hot and burning at the start, dimming over time…but even after many years, memory particles surface now and then to remind you of a life that's gone. I should point out that the candle's infinite fall is only in the eye of the outside observer. A trick of the light. From the candle's point of view, it drops straight down and crosses the event horizon without pause. Inside the black hole its flame may still be burning; it's just that the light doesn't reach the outside world anymore. The next morning, Sunday, May 6, 1990, I reread what I'd written, wondering if there was anything that could be salvaged. I was struck by a new regret: I'd written about some guy named McGregor, not about the students. I knew why I'd written it that way, of course. I didn't believe I had the right to put words in their mouths, thoughts in their heads. How could I presume to speak for the real people? I could only deal with characters. But I'd gone too far into the fiction. In my story, like the newspaper articles, the victims were only there for the body count. Without thinking, I'd started to write the story of a button-pusher who was troubled by his conscience, but who went ahead and did what he had to do for the good of history. Sound familiar? Same setting as the piece I wrote the previous day, but someone different in the time chamber. Someone who would join the National Guard and instigate the tragedy. Someone who would have to face what he had done and eventually…well, I didn't know what would happen to Bannister. As the story unfolded, as I got to know him better, I'd discover whether he went mad, found wisdom, became a soulless killer, whatever. Sometimes the reason you write a story is to learn how it turns out. I spent most of Sunday morning on the Bannister story, but as time went on my doubts grew. By lunch I had to admit that my second try was just as corrupt as the first one. I was trying to reassure myself there was an underlying purpose to the events, that someone somewhere knew the price and made a choice. But I didn't believe that. Furthermore, I didn't believe in letting the National Guard off the hook by suggesting they were spurred on by an outside provocateur. As I sat in my study and comfortably sipped mint tea twenty years after the fact, it wasn't my place to lay blame; but it wasn't my place to make excuses either. The Kerr-Newman model of a rotating black hole can be mathematically extended by recoordinatizing, using a scheme suggested by the work of M. D. Kruskal (1960). The result is a model where the black hole has a white hole on its flip side. Just as a black hole is a phenomenon that no slower-than-light object can leave, a white hole is a phenomenon that no slower-than-light object can enter. Light and matter can flood out of a white hole, but nothing can get back inside. Beyond the white hole, the extended model shows an area of space whose physical characteristics are the same as our own familiar space—"another universe," if you want to look at it that way. Extending mathematical models is a dicey business. I could, if I wanted, extend the mathematical model of temperature below absolute zero Kelvin and find that (wow!) there was a whole other universe down there where temperatures were negative instead of positive. Mathematically, I could argue the idea was valid; but physically, it's nonsense. One mustn't get carried away believing scribbles on paper. But the black hole/white hole model is more satisfying than an unadorned black hole. The white hole completes the black hole's story. Things vanish into a black hole and it seems they are gone forever; but unbeknownst to us, they pass through the darkness, through crushing forces, through a moment of infinity at the very heart of the black hole, and then they flood out the other side into a new and brightly illuminated universe. It could be the oldest story in the world. Ra in his sunboat. Jonah in the whale. Dying heroes and deities from every culture on the planet. The journey into blackness. The dark night of the soul. The moment of trial and grace. Glorious liberation and rebirth into a new world. Kerr-Newman has it all. I've never heard anyone talk about the black hole/white hole model from a theological viewpoint. No one is comfortable with theology anymore. I know I'm not. But I'm comfortable with ghost stories. That was my question too. What was I going to do? Call in the National Guard? Look: ghosts appear because they have unfinished business. And if anyone has unfinished business, it must be those who were killed senselessly. But what can they do to finish their stories? Should the four Kent State students haunt the living National Guardsmen and torment them for their acts? That's so cheap: just crude revenge. Should the bodies be brought back to life at midnight, whereupon they could have a single hour to come to terms with their deaths? Maybe the same thing happens twice a year like business conventions, Walpurgisnacht and Hallowe'en, each get-together hosted by different committees—the soccer fans at Hillsborough, say, or the Jews and gypsies and gays processed through Nazi death camps—and the goal is simply to purge anger and regret, a little bit more each meeting, until finally the soul is ready to let go and move on. I could envision the Kent State students wandering their old campus, talking to night-owl students, trying to find peace… Students at Kent State were demonstrating for peace when the four victims died. I broke off writing for supper. Sunday supper, traditional time in North America for family and conviviality. I don't remember how convivial I was. I could have been distracted because I wanted to get back to writing after dinner. But when I went back, I realized I had trivialized my subject again. It wasn't just that the tone of voice was flippant; it was the I stared at the computer screen for a long time, wondering what to write…wondering if there was anything I Nothing came to mind. A mathematical singularity is a place where a function, a formula, breaks down. Often the breakdown happens because the function "goes to infinity" at that point; for example, the formula for the function may try to divide by zero. In the heart of a Kerr-Newman black hole there is a singularity in a function called For a long time, physicists wondered if the singularity was genuine. Maybe it was simply a result of their choice of coordinates: the way they wrote out the formula for In the late 1960s, mathematicians proved that the singularity existed in all coordinates. All possible rulers broke at the same point. At the heart of the black hole's darkness, physicists could only throw away their rulers and stand back in blank contemplation. Days and weeks passed. I kept thinking. Nothing more, just thinking. I didn't see the dead students in my dreams. To tell the truth, if I wanted to remember their faces I had to go back and look at their photos in the book. Kent State didn't haunt me. It niggled at me. The library books came due. I wrote the names of the books in my files and took them back. I also recorded the names: Allison Krause Jeff Miller Sandy Lee Scheuer Bill Schroeder Those names hadn't appeared anywhere in my three story attempts. I had to write them down separately so I would remember them. Otherwise I'd lose the names and be left with three uncompleted story-scribbles that all missed the point. Now and then I would open my "ideas" notebook and see my original jottings about Kent State. Time travel. Ghosts. But I couldn't travel backward in time. I couldn't summon ghosts or lay them to rest. I could stuff my stories into the empty spaces surrounding the tragedy, but the stories themselves walled off the reality, put it out of reach. The situation reminded me of a white hole. A white hole floods its universe with light; but you can never touch it. And so I began thinking of white holes, black holes, and a mathematics thesis whose math had leaked away, leaving behind only metaphors. The result wasn't a story about Kent State. But at least it was my story to tell. Imagine an object falling into a black hole: something small like the body of a young man or woman, or perhaps something large like the campus of a university. Imagine an outside observer, a distant spectator far removed from the immediate pull of the black hole. He shines a light toward the falling object—the object casts no light of its own, so if the observer wants to see it he must provide his own illumination. He waits for the light to strike the object, then return to his eye. There are several possibilities for what happens next. The light may strike the object as it falls through the ergosphere, a region where places become moments and moments become places. That close to the black hole itself, the returning light particles may take years to climb back out of the gravity well and reach the observer. But someday the light Or the light may not reach the falling object until the object has crossed the event horizon. If the object is inside the hole, the light may strike the object and bounce, but it cannot reach the observer outside. The light will only bounce deeper into the blackness. The observer will never see it. Or perhaps, if the cosmos deigns to conform itself to mathematics, there is a third alternative. The falling object plunges through the heart of the black hole and out a white hole on the other side. By the time the observer's light enters the black hole, the object is gone. The light finds nothing but blackness. There is no contact. To the observer, the object has fallen into an impenetrable dark; but in another universe, perhaps the object tranquilly sails on. The outside observer waits for his light to return. He wonders if the object has fallen so far he will never truly see it. There is no way to tell until the light actually comes back. If it ever does. Other observers have given up and gone home. The outside observer waits. |
||
|