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Gravity Doesn’t Exist – Is it just an Illusion?

Could both gravity and the Big Bang be an illusion? In January 2010, Erik Verlinde, professor of Theoretical Physics and world-renowned string theorist, caused a worldwide stir with the publication of On the Origin of Gravity and the Laws of Newton, in which he challenged commonly held perceptions on gravity, going so far as to state ‘for me gravity doesn’t exist’. If he is proved correct, the consequences for our understanding of the universe and its origins in a Big Bang will be far-reaching.

“Everyone who is working on theoretical physics is trying to improve on Einstein,” says Robbert Dijkgraaf, UvA University Professor and current director of the Institute for Advanced Studyin Princeton (where scientists including Turing, Oppenheimer and Einstein have worked) In my opinion, Erik Verlinde has found  an important key for the next step forward.”Verlinde, who received the Spinoza prize (the Dutch Nobel Prize) from the Netherlands Organisation for Science, is famous for developing this new theory, or idea, on gravity in which he says that gravity is an illusion. “Gravity is not an illusion in the sense that we know that things fall,” says Verline.” Most people, certainly in physics, think we can describe gravity perfectly adequately using Einstein’s General Relativity. But it now seems that we can also start from a microscopic formulation where there is no gravity to begin with, but you can derive it. This is called ‘emergence’.”

“We have other phenomena in Physics like this,” Verlinde continued. “Take a concept like ‘temperature’, for instance. We experience it every day. We can feel temperature. But, if you really  think about the microscopic molecules, there’s no notion of temperature there. It’s something that has to do with the property of all molecules together; it’s like the  average energy per molecule.”

To Verlinde, gravity is similar. It’s something that only appears when you put many things together at a microscopic scale and then you suddenly see that certain equations arise. “As scientists,” he observes, “we first want to understand nature and our universe. In doing so,  we have observed things that are deeply puzzling, such as phenomena related to dark matter. We see things happening that we don’t understand. There must be more matter out there that we don’t see. There’s also something called ‘dark energy’. And then there’s the whole puzzle of the beginning of the universe. We now have what is called the ‘Big Bang’ theory.

Verline belives his ideas will shed new light on the concept of ‘dark matter’ and ‘dark energy’ and why they’re important in relation to gravity.

“We think we understand gravity in most situations,” he says “but when we look at galaxies and, on much larger scales, at galaxy clusters, we see things happening that we don’t  understand using our familiar equations, like Newton’s equation of gravity or even Einstein’s gravity. So we have to assume there’s this mysterious form of matter,  which we call dark matter, which we cannot see. Now dark energy is even weirder, in the sense that we don’t even know what it consists of. It’s something we can put in  our equations to make things work, but there’s really a big puzzle to be solved in terms of why it’s there and what it’s made of. At present, we have not really found  the right equations to describe it. There’s clearly progress to be made in terms of finding a better theory of gravity, and understanding what’s happening in our universe.”

For example, the Big Bang theory is the idea that at a particular moment things suddenly started exploding and growing, and that our universe got  bigger, which Verlinde finds illogical to think it came from this one moment.

“It’s illogical to think there was nothing and then it exploded. We use concepts like time and space,” he adds, “but we don’t really understand what this means microscopically. That might change. The Big Bang has to do with our understanding of what time should be, and I think we will have a much better understanding of this in the future. I think we will figure out that what we thought was the Big Bang was actually a different kind of event. Or maybe that we should not think that the universe really began at a particular moment and that there’s another way to describe that.”

Verlinde believes that the information we have today and the equations we now use only describe a very small part of what is actually going on. “If you think that something grows, like our universe, than something else must become smaller,” he observes.”I think there’s something we haven’t found yet and this will help us discover the origins of our universe. In short, the universe originated from something, not from nothing. There was something there and we have to find the equations. It has something to do with dark energy and how that is related to dark matter. If we understand the equations for those components of our universe, I think we’ll also have a better understanding of how the universe began. I think it’s all about the interplay between these different forms of energy and matter.

The Big Bang theory works well in the sense that it gives us some understanding of how particular elements in our universe came about and there are other things that we can observe, like the radiation that came from the Big Bang. But the whole idea of an expanding universe that started with a big explosion will change. “You need to think about the equations in a bigger setting,” Verlinde observes. “You need to describe more than just the matter particles. You need to know more about what space/time is. All these things have to come together in order to be able to explain the Big Bang.”

Quantum mechanics took approximately 26 years to develop, Verlinde concludes. “We’ve had string theory for 40 years and nothing yet  has come out of that which can be directly tested with observations or experiments. I think my idea has a greater chance of being tested with observations, which is an  exciting thing. I think it will take no more than 10 or 15 years.”

The end result be belives will lead to a paradigm shift in how people think that the universe was created.

Science & Technology

Facebook patented hand tracking system

Facebook patented hand tracking with finger emitters.

Facebook Technologies / USPTO, 2020

Facebook has patented a hand tracking system using small transponders at the ends of the fingers. The patent describes a glove with several emitters and a receiving system that distinguishes the signals from each emitter, calculates their location and restores the shape of the hand. The Patently Apple website drew attention to the patent.

Motion capture systems are often used when shooting movies, as well as in virtual reality. There are several standard tracking methods. For professional projects, an external system is often used, which consists of high-speed infrared cameras on the walls and infrared markers on clothes.

This is a rather inconvenient and extremely expensive system, so home VR systems usually use gloves that track the pose of the hand, and a separate massive beacon on the arm that allows the base station near the computer to track its location. Also recently, hand tracking systems using cameras and machine vision algorithms have begun to develop. In particular, at the end of 2019, such a feature appeared in Oculus Quest, which is being developed by a Facebook-owned company.

In a new patent, Facebook engineers described a method for tracking brush poses across multiple emitters. It is assumed that the system will consist of two parts: a glove and a tracking station nearby, for example, on a table near a computer or set-top box. The glove contains several transponders operating on millimeter waves. They can be located at the ends of the fingers, as well as on other parts of the brush for more precise tracking.

System diagram Facebook Technologies / USPTO, 2020

The tracking station has several antennas. They emit signals towards the glove, and transponders emit response signals. After this, the antennas receive response signals, using triangulation, they calculate the location of the transponders and create a three-dimensional model of the brush. The authors note that the signals can be modulated by time, frequency, or changed by other parameters so that they are unique for each transponder and facilitate the task of creating a model.

Glove diagram with transponders Facebook Technologies / USPTO, 2020

In recent years, many miniature emitters for the millimeter radio band have appeared. Most often they are  offered to be used for communication of the 5G standard (mmWave range), as well as in compact radars for smartphones and smart watches.

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Science & Technology

Do Advanced Extraterrestrial Civilizations extract energy from black holes?

Researchers from the School of Physics and Astronomy at the University of Glasgow in the UK have proven a half-century hypothesis that suggests that technologically advanced extraterrestrial civilizations could potentially extract energy from spinning black holes. An article by researchers is published in the journal Nature Physics.

In 1969, the British physicist Roger Penrose suggested that aliens can extract energy from a rotating black hole due to the fact that particles or waves flying through the ergosphere take away the energy of rotation of the black hole (this phenomenon became known as the Penrose process). 

The Soviet physicist Yakov Zeldovich developed this idea and put forward the hypothesis that a rapidly rotating cylinder is capable of amplifying the “swirling” electromagnetic waves incident on it (that is, having a certain orbital angular momentum), including quantum fluctuations in a vacuum. 

However, this effect has not yet been experimentally verified, since the cylinder had to rotate at a frequency of at least a billion times per second.

In a new work, scientists for the first time managed to observe the Zeldovich effect, achieved using acoustic waves with a frequency of 60 hertz. 

During the experiment, the researchers installed 16 speakers in the form of a ring and directed the sound toward a rotating disk made of noise-absorbing foam. In this case, the acoustic waves from one speaker lagged behind in phase from the waves from another speaker, which made it possible to simulate the orbital angular momentum. Conditions satisfying the Zeldovich effect were achieved by rotating the disk with a frequency of only 15-30 revolutions per second.

The experimental results confirmed that low-frequency modes can be amplified by up to 30 percent, passing through the noise-absorbing layer of the disk. As the speed of the disk increases, the frequency of sound waves decreases due to the Doppler effect, however, when a certain speed is reached, it again returns to its previous value, while the volume (i.e. the amplitude) increases. This is due to the fact that the waves took part of the rotational energy from the disk.

The Penrose process occurs when the body has two parts, one of which falls beyond the horizon of events. If two fragments have certain speeds, a special position relative to each other and fly along the correct paths, then the fall of one fragment transfers the energy to the other part, greater than the energy that the body had originally.

 For an outside observer, it looks as if the body was divided into a part with positive energy and a part with “negative energy”, which when falling beyond the horizon reduces the angular momentum of the black hole. As a result, the first fragment takes off from the ergosphere, “taking” the energy of rotation of the black hole.

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Science & Technology

What if we could create antigravitу?

Are уou tired of cramped citу life? Then anti-gravitу is just what уou need! We still don’t know the technologу, but if we do, it will completelу change our world.

How can this change the waу we build our cities? Whу would this allow us to travel further into space? And how can this help us colonize alien worlds?

According to astronomers, gravitу is “the force bу which a planet or other bodу pulls objects to its center. We reallу don’t know whу gravitу behaves like this; we just know that this is so, and that’s all we need for this.

As we talk about things that we know too little about, let’s get to know her better. Antigravitу, as the name implies, is a hуpothetical means of counteracting the effects of gravitу.

Although manу scholars saу this is not possible, this does not stop us from reasoning. But if we ever find out, we will have to delve into an even more mуsterious part of our universe – antimatter.

To understand what antimatter is and how it relates to antigravitу, we will go back during the Big Bang. When the Big Bang occurred, he created matter and antimatter. Matter consists of atoms – the building blocks of chemical elements such as helium, oxуgen and hуdrogen.

Inside the atoms уou will find particles, such as protons, which have a positive electric charge, and electrons, which usuallу have a negative charge. For antimatter, the electric charge of these particles is reversed.

This led to some speculations that other properties will also be changed, such as how theу react to gravitу. We could not verifу how antimatter reacts to gravitу – for now. However, some theories saу that when we do this, we will find that antimatter particles do not fall, giving us our first real example of antigravitу.

If so, this could lead to a scientific and technological revolution. We could theoreticallу use antimatter to develop technologу that protects people or objects from gravitational forces. In other words, we can make so manу things float in the air.

So what would we do with this crazу technologу? Well, firstlу, there should be hoverboards, right? We’re talking about real hoverboards that don’t touch the ground!

We could build floating cities to accommodate our ever-growing population. Massive structures can be suspended over ponds or rockу terrain that we could not build. But perhaps we will see the greatest importance of anti-gravitу technologу, if we look even further – at the stars.

Space travel will be much safer and cheaper. Space shuttles will not need rocket fuel to launch from our atmosphere. Instead, we could just stop the effects of gravitу on them.

Antigravitу will not onlу help us get to space; It can also help us find a new home there. We no longer need to worrу about planets with gravitу too strong for human habitation, since we can simplу use antigravitу to protect ourselves from it.

Yes, we understand that there is a lot of unknown and hуpothetical with this, but here’s what happens when we talk about something as mуsterious as antimatter.

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