Categoriearchief: Barology

Study of gravitation

Dark Energy

Maarten Vanden Eynde
Gravitational Bending, 2010

Maarten Vanden Eynde gravitational bending

Even weirder than dark matter—the invisible stuff constituting most of the mass of the universe—is dark energy, a mysterious force pushing the universe apart at an ever-faster rate. Dark energy has been around for most of the history of the cosmos. “Nine billion years ago, dark energy was already wielding its repulsive influence on the universe,” explains Johns Hopkins University astrophysicist Adam Riess. But the repulsion didn’t exceed the force of gravity until 5 billion years ago, when cosmic expansion kicked into high gear and began accelerating.

A pioneering space mission called the Wilkinson Microwave Anisotropy Probe (WMAP) delivered the first accurate account of the overall makeup of the universe. The answer is decidedly strange. Dark energy makes up 73 percent of the universe, dark matter another 23 percent. Atomic matter—everything around us and everything astronomers have ever seen—accounts for just 4  percent.

dark energy

Comparing images from the Hubble Space Telescope’s high-end cameras with the WMAP heat signature map of the early universe, Riess and his colleagues retraced the growth history of the universe with unprecedented accuracy and depth. “It’s as if you mark the height of a child against a doorframe to measure growth spurts,” Riess says. For reasons as yet unknown, the antigravitational effects of dark energy are greater now than they were in the distant past. One theory, supported by the Hubble data, is that empty space is impregnated with residual energy from the Big Bang. As space expands, so does dark energy, while matter is spread out, weakening the inward pull of gravity.

Based on a text by Alex Stone

Chu Yun
Constellation, 2006

Chu Yun

Galaxy made out of LED lights from various devices.

The God Particle

Alexandra Mir
The Dream and the Promise, 2009

Alexandra Mir

‘Infinite space within an infinite nothingness. Undefinable spirit within unlimited thought. Icons and insatiable quests. Human curiosity has a need for a context within which to exist. Religion was science as science is now religion. The justification of our lust and thrust for the infinite, away from our sensory paradise, comparable to the search for the deepest recesses of our minds, are both ways of seeking the answers to creation, purpose and demise. Religion, as a system of control, has come close to its great rival throughout history – the laws of physics that govern our universe. ‘When will miracles cease?’ – The modes of technology that we produce are ingenious to the children of earth but woefully inadequate adaptations of our unlimited imagination. ‘Why are we here?’ – Spiritual answers are equally unsatisfactory compared to the power of such simple questions. The answer may lie in convergence. Technology may have to wait for the power of the human brain to fully develop its (super)natural abilities. Will the technologies that are then produced be miraculous in that they may not require material substance to work but a faith, a belief in laws of physics so subtle than matter itself cannot withstand their logic? Will they be based in technology so discreet that it will be indistinguishable from the very fabric of the universe and all that is created within it? When we look at science and religion, are we looking at the same technology at different levels of evolution? Is humankind always to be polarised and thus paralysed?’ – Mark Baker –

The Large Hedron Collider

god particle

Photo: Maximilien Brice, CERN

If you were to dig a hole 300 feet straight down from the center of the charming French village of Crozet, you’d pop into a setting that calls to mind the subterranean lair of one of those James Bond villains. A garishly lit tunnel ten feet in diameter curves away into the distance, interrupted every few miles by lofty chambers crammed with heavy steel structures, cables, pipes, wires, magnets, tubes, shafts, catwalks, and enigmatic gizmos.

This technological netherworld is one very big scientific instrument, specifically, a particle accelerator-an atomic peashooter more powerful than any ever built. It’s called the Large Hadron Collider, and its purpose is simple but ambitious: to crack the code of the physical world; to figure out what the universe is made of; in other words, to get to the very bottom of things.

There’s one puzzle piece in particular that physicists hope to pick out of the debris from the LHC’s high-energy collisions. Some call it the God particle.

The preferred name for the God particle among physicists is the Higgs boson, or the Higgs particle, or simply the Higgs, in honor of the University of Edinburgh physicist Peter Higgs, who proposed its existence more than 40 years ago. Most physicists believe that there must be a Higgs field that pervades all space; the Higgs particle would be the carrier of the field and would interact with other particles, sort of the way a Jedi knight in Star Wars is the carrier of the “force.” The Higgs is a crucial part of the standard model of particle physics—but no one’s ever found it. – Joel Achenbach –

Mo(NU)mentum

Maarten Vanden Eynde
Mon(NU)mentum, 2008 AD
(450 x 60 cm)

Maarten Vanden Eynde Monumentum

Maarten Vanden Eynde Monumentum

Time is a philosophical dimension, a basic substance which we breath in and out constantly. Just like space it is always there. Time experience however seems to be working on many different levels in an ever changing and more personalized speed (sometimes a minute can last forever and your life can fly by in a fraction). Time is not static, it is always on the move. The impossibility to stop time is mirrored by the impossibility to live in the present. ‘Now’ is an elusive point between the past and the future. Like the gardener on his way to Ispahaan, the present is on his way to an unavoidable destiny: the past. There is no escape. When you read THIS word, it became history already. The future is catching up instantly. What is the force that powers the engine of time? Is the present being pulled towards the future?

The Universal Law of Gravitation has several important features. First, it is an inverse square law, meaning that the strength of the force between two massive objects decreases in proportion to the square of the distance between them as they move farther apart. Second, the direction in which the force acts is always along the line (or vector) connecting the two gravitating objects.
In 1687 Sir Isaac Newton first published his Philosophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) which was a radical treatment of mechanics, establishing the concepts which were to dominate physics for the next two hundred years. Among the book’s most important new concepts was Newton’s Universal Law of Gravitation. Newton managed to take Kepler’s Laws governing the motion of the planets and Galileo’s ideas about kinematics and projectile motion and synthesize them into a law which governed both motion on earth and motion in the heavens. This was an achievement of enormous importance for physics; Newton’s discoveries meant that the universe was a rational place in which the same principles of nature applied to all objects.
Could it also work for Time?

Between two objects, let’s say A and B, there is a point where the gravitation of both objects is working with equal force (L1 point, named after Lagrange ). This point is balancing between the two attracting masses. If it is slightly bending towards A or B is will be attracted more by either one of them. It can only move from it’s frozen position, without loosing it’s equal balance, if A and B change mass simultaneously. The mass A is loosing, B has to gain. If time would be a linear experience, and A would be the past and B the future, than the point (C) hanging in the middle would be the present.
Presuming the past is getting longer and longer (or bigger and bigger), in order for C to be equally drawn to both A and B, it needs to be moving towards the future. The past is getting bigger and the future is getting smaller. And on top of that the speed of this process seems to be accelerating. With the population growth as exemplary model and driving fuel, evolution takes place at an unprecedented speed. New inventions and discoveries changing the world beyond recognition are constantly coming closer after each other. Just like the birth of matter during the big bang, time was created at the same moment and moves equally with the expanding universe; faster and faster to it’s final destiny.

The installation ‘Mo(NU)mentum’ is made up of several layers of history, creating a massive pillar. The drill core is like a sample of time, taken from the earth in the future to understand how the world evolved. Starting with a massive block of stone (in which the different geological layers are visible) the drill core contains samples of wood, copper, metal, bricks, concrete, asphalt, tar and plastic. The layers are getting thinner and thinner the closer they get to the present = the plastic layer. So far the materials created a foundation for the next, but the plastic layer is so thin and vulnerable that it is impossible to continue from there. It is a final moment in present evolution.

Maarten Vanden Eynde Monumentum

Mo(NU)mentum is a monument for the future, visualizing the impossibility to continue the current evolution. It is a permanent memory and trace of Generali Groups Executive Forum on Time: Business Opportunity and Strategic Timing. The best Champagne was served in plastic Champagne glasses. The empty glasses were collected and melted on top of the installation, thereby physically contributing the last layer.

The History of Tomorrow

– a short story-

by Maarten Vanden Eynde, 2006/2007
in collaboration with Marjolijn Dijkman

Maarten Vanden Eynde The History of Tomorrow

A billion stars twinkled in the universe, irregularly like diamonds. I woke up in a sweat and tried to christalize where I was. The heavy window screens were open but I could only feel a pitch-black sky. I rolled over to the side and found my glasses. There, up there on the left, it should be there! Was I still sleeping? I blinked my eyes a couple of times, but was disappointed again. It was gone, it was really gone…

The loss of gravitation first came to general notice on the 15th of June 2008, during the Olympics in Beijing, China. On that day 27 world records were broken. Lees verder

Time Travel – Shaping the Future

by Neil Johnson

The idea of travelling forward into the future or back into the past has always fascinated science fiction writers. The ‘grandfather paradox’ is the argument many people use to suggest that time travel is impossible. What if you went back in time and prevented your grandfather from meeting your grandmother so that your mother was never born? Then you would never have been born… and so on. Until very recently such arguments led most scientists to believe that time travel could never exist outside science fiction. But amazingly, some interpretations of the weirdness of the quantum world now suggest that time travel is possible – at least in theory.

Gravity and black holes
Einstein’s theory of relativity brought space and time together in a single, four-dimensional arrangement that he called spacetime. We know that we can travel forwards, backwards and sideways in space, so why not forwards and backwards in time?

Four dimensions are difficult to imagine, so physicists usually suggest you think of spacetime as a rubber sheet stretched out flat. If there are no large masses around, the sheet stays flat, and so any object placed on it will move around in straight lines. But a large mass, such as the Sun, makes a dip in the sheet because it actually warps spacetime. Now any other object with smaller mass, like our Earth, moving about in spacetime rolls into the dip as it comes past the Sun. It appears ‘attracted’ to the large mass. This effect of warping spacetime is what gives rise to gravity.
The Universe is full of heavy objects exerting gravitational effects and the net result is that spacetime is not flat at all but curved. Everything, including light, has to follow curved paths in spacetime. We know Einstein was right about this because astronomers can sometimes see distant stars that ought to be masked by nearer objects such as the Sun. Instead of travelling in straight lines and hence being blocked, the light from the stars bends round the obstruction.

When a star reaches the end of its life it may collapse inwards under the influence of its own gravity to such an extent that all its matter becomes concentrated into an extremely dense object a fraction of its original size. This is a black hole. Black holes have such a huge gravitational pull that nothing can escape from them, not even light. We cannot see them but we have good evidence that they exist. We can see stars behaving in ways which suggest that they are being pulled about by a nearby invisible object with enormous mass.
What does a black hole do to spacetime? Relativity predicts that at the centre of a black hole is an infinitely dense point, called a singularity, within which all the normal laws of physics no longer apply. Time, space, matter and energy no longer have any well-defined meaning. Einstein’s equations show that such a singularity doesn’t just make a dip in the imaginary rubber sheet of spacetime, it makes a tunnel that goes right through and momentarily opens out on the other side.
Where is ’the other side’? It could be somewhere else in spacetime, either in the future or in the past, or it could even be in another Universe! If you could take a spaceship through such a tunnel, or wormhole, you would have discovered the secret of time travel. This is of course impossible with today’s technology. But in the future, who knows?

Mini wormholes
Einstein’s equations describe a spacetime that is perfectly smooth, like the rubber sheet. His theory of relativity only deals with the physics of what happens on big scales. It cannot deal with what happens at the centre of a black hole, or what happened during the moment of the Big Bang at the birth of the Universe when spacetime itself was infinitesimally small. That takes us back into the world of quantum physics.
If you could look at spacetime with a magnifying glass so powerful that it reached down to the quantum scale, you would not see the smooth, continuous sheet of Einstein’s spacetime. Just as a foam rubber ball looks smooth from a distance but rough and ragged close up. In this picture of spacetime it is quite likely that tiny holes could open up, entrances to little tunnels between now and other times, or between here and other universes. Another option for future time travellers would be somehow to harness these tiny wormholes and expand them.

Many worlds, many futures?
To return to the question that has puzzled thinkers since Newton’s day, is the future preordained? Or are there an infinite number of futures? One way of looking at the quantum world suggests that not only are there an infinite number of futures, but they are realised in an infinite number of universes.
Photons and electrons sometimes behave as waves and sometimes as particles, but never both at the same time. So far, the argument for interference between one universe and another applies only to events occurring at the quantum level.
But the idea of parallel universes provides a possible resolution to the ‘grandfather paradox’ that might otherwise cause problems for time travellers. If we travel back in time and change history, we launch ourselves into a new future in a parallel universe – but we have no effect on the present one from which we started out.

Scientists of the future may well pursue a new form of futuristic technology based on quantum effects. Such applications could include quantum teleportation, by which a quantum particle can be teleported from one point in space to another; and quantum computation, where calculations can be carried out which would take many years on a conventional computer. Although we now know how to measure time very accurately, have we come any nearer to answering the basic question ‘What is time?’.

Neil Johnson is a Physics lecturer at Oxford University where he heads his own research group.

Gravitation of Time

The Universal Law of Gravitation has several important features. First, it is an inverse square law, meaning that the strength of the force between two massive objects decreases in proportion to the square of the distance between them as they move farther apart. Second, the direction in which the force acts is always along the line (or vector) connecting the two gravitating objects.
In 1687 Sir Isaac Newton first published his Philosophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) which was a radical treatment of mechanics, establishing the concepts which were to dominate physics for the next two hundred years. Among the book’s most important new concepts was Newton’s Universal Law of Gravitation. Newton managed to take Kepler’s Laws governing the motion of the planets and Galileo’s ideas about kinematics and projectile motion and synthesize them into a law which governed both motion on earth and motion in the heavens. This was an achievement of enormous importance for physics; Newton’s discoveries meant that the universe was a rational place in which the same principles of nature applied to all objects.

Maarten Vanden Eynde

‘Between two objects, let’s say A and B, there is a point where the gravitation of both objects is working with equal force (L1 point, named after Lagrange). This point is balancing between the two attracting masses. If it is slightly bending towards A or B is will be attracted more by either one of them. It can only move from it’s frozen position, without loosing it’s equal balance, if A and B change mass simultaneously. The mass A is loosing, B has to gain.

Time is always moving. When you read this word, it became history already. The future is catching up instantly. The present is an untouchable point always on the move.
If time would be a linear experience, and A would be the past and B the future, than the point hanging in the middle would be the present. The past is getting longer and longer (or bigger and bigger) so in order for this point to be equally drawn to both A and B, it needs to be moving towards the future. The past is getting bigger and the future is getting smaller. And on top of that the speed of this process is accelerating. Just like the birth of matter during the big bang, time was created at the same time and moves equally with the expanding universe; faster and faster to it’s final destiny. Will this be the end or a new beginning?’

time

The Lagrangian points (also Lagrange point, L-point, or libration point), are the five positions in interplanetary space where a small object affected only by gravity can theoretically be stationary relative to two larger objects (such as a satellite with respect to the Earth and Moon). They are analogous to geosynchronous orbits in that they allow an object to be in a “fixed” position in space rather than an orbit in which its relative position changes continuously.

Lagrangian points

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