In this video, Unveiled takes a closer look at the possibility of traveling at the speed of light! Perhaps more than any other target in physics, this is the one that scientists really want to achieve! But there are some theories that, actually, we can ALREADY travel at light speed… it’s just that the rest of the world doesn’t know it yet!
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In November 2018, three physicists from the Perimeter Institute for Theoretical Physics in Waterloo, Canada, offered an unusual idea: from the Big Bang not only the Universe we know but also ‘its mirror image’ created.
Twin spiral galaxies and stars in space. NASA provided picture elements. A universe that extends backward in time. From our perspective, the Universe “after the Big Bang” moves… backwards.
The physicists Latham Boyle, Keran Finn, and Neil Turok suggested in a Physical Review Letters article that the Universe we live in is merely a fragment of the true Universe and that if so, dark matter and inflation would no longer make sense.
The first important generative models for images used an approach to artificial intelligence called a neural network — a program composed of many layers of computational units called artificial neurons. But even as the quality of their images got better, the models proved unreliable and hard to train. Meanwhile, a powerful generative model — created by a postdoctoral researcher with a passion for physics — lay dormant, until two graduate students made technical breakthroughs that brought the beast to life.
DALL·E 2 is such a beast. The key insight that makes DALL·E 2’s images possible — as well as those of its competitors Stable Diffusion and Imagen — comes from the world of physics. The system that underpins them, known as a diffusion model, is heavily inspired by nonequilibrium thermodynamics, which governs phenomena like the spread of fluids and gases. “There are a lot of techniques that were initially invented by physicists and now are very important in machine learning,” said Yang Song, a machine learning researcher at OpenAI.
What is the Drake Equation? We are talking about The Odds of ALIEN LIFE. Is there life out there in the Universe? How are the chances to find Extraterrestrial life?
We don’t know the answers to a lot of questions, for example: How many alien societies exist, and are detectable? Even though we don’t know how to answer such a question, we can at least try to figure it out with a little help from our beloved…Math. First, we have to have a pretty good idea about how the universe works, and of course about the star and planetary formation, as well as conditions for life as we know it. This means we have to study and collect a lot of data. Luckily for us, we – humans — aren’t so bad. Physics, astronomy, chemistry, biology and all-natural sciences offer us the hints for the mathematical set of parameters that will give us an equation to calculate the number of alien societies that exist and are detectable. Second, one has to sit down and think about which parameters should appear in the equation, and which not. Do you think it’s difficult? I think so. But luckily for us, in 1961 scientists Drake came up with a famous equation, that estimated the number of transmitting societies in the Milky Way Galaxy…
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An engine idea that can accelerate to 99 percent of the speed of light, all without the need for propellant. That may sound like something out of a science fiction movie, but it’s not. This is exactly what one of NASA engineers is developing, and it promises to break the law of physics.
How will these engines be developed? If it is going to work without propellant, then what will be its fuel? And most importantly, will a human be able to travel in a vehicle with such an engine as its thruster? Well, we will find out in just a second.
Boltzmann brains are perhaps one of the spookiest ideas in physics. A Boltzmann brain is a single, isolated human brain complete with false memories that spontaneously fluctuates into existence from the void. They’re the kind of thing you’d find in a campfire horror story. The big problem, however, is that a range of plausible cosmological models (including our current cosmology) predict that Boltzmann brains will exist. Even worse, these brains should massively outnumber “ordinary” conscious observers like ourselves. At every moment of your existence, it is more likely that you are an isolated Boltzmann brain, falsely remembering your past, than a human being on a rocky planet in a low-entropy universe.
In this video I explain where the idea of Boltzmann brains originated, and why they haunt modern cosmology.
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If you know anything about special relativity then you probably know that how fast you’re moving has an impact on how quickly time passes for you. What physics gives rise to this effect? Do you need to know some complicated mathematics in order to understand it?
It turns out that this effect, known as “time dilation”, can be very easily derived for a special kind of clock: a light clock. In this video, I consider a light clock moving through space and show how the postulates of special relativity entail that this moving clock runs slow.
Watch the video to learn what the two postulates of Einstein’s Special Relativity are, and why they entail that moving clocks slow down.
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Year 2022 What they find is a new type of physics generated by their artificial intelligence.
The determination of state variables to describe physical systems is a challenging task. A data-driven approach is proposed to automatically identify state variables for unknown systems from high-dimensional observational data.
