Physicist Jim Al-Khalili explores the incomprehensible scale of the universe. A cosmic journey into the laws of gravity, relativity, and the formation of supergalaxies. Discover how the largest structures shape our understanding of the cosmos itself.
Director: Tim Usborne.
Writers: Jim Al-Khalili, Tim Usborne.
Stars: Prof. Jim Al-Khalili (Physicist, Presenter)
Genre: Science Documentary, Physics, Cosmology.
Country: United Kingdom.
Language: English Also Known As: Secrets of Size: Going Big (BBC)
Release Date: 2022
Filming Location: United Kingdom / Various International Locations.
Synopsis:
In this second episode of the fascinating series Secrets of Size, Professor Jim Al-Khalili takes us on a cosmic journey into the immensity, exploring the largest scale of the universe.
We leave behind the quantum realm to focus on the forces that govern the largest structures: gravity and relativity. Al-Khalili explains how these laws shape the existence of galaxies, galaxy clusters, and the immense supergalaxies.
The episode reveals the incomprehensible scale of the cosmos, where time and space are distorted, and how the study of these giants allows us to understand the origin, evolution, and perhaps the ultimate destiny of the universe itself.
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A century after the birth of quantum mechanics, physicists still argue about what the theory is really describing. Does the wave function represent something real, or just our knowledge? Why does “measurement” appear in the laws of nature at all?
Sean Carroll reveals how quantum mechanics solved one set of problems while creating a deeper one.
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Time feels obvious, but physics tells a stranger story about its existence: Theoretical physicist Jim Al-Khalili explores why our sense of time may be incredibly misleading, including the idea that past, present, and future might all exist at once.
0:00 Chapter 1: Does time flow?
2:42 Why Time Feels Faster as We Age.
3:56 Time and Change in Philosophy and Physics.
5:28 Einstein and the End of Absolute Time.
6:19 Time in the Equations of Physics.
7:50 Chapter 2: How do we reconcile quantum field theory with the general theory of relativity?
12:10 Evidence for Time Dilation: Muons.
14:29 Gravity Slows Time: General Relativity.
19:22 Space-Time and the Block Universe.
21:55 Does Time Really Exist?
26:33 The Debate: Eternalism vs Presentism.
34:12 Chapter 3: Is There a “Now”?
40:40 Chapter 4: Why Does Thermodynamics Have a Direction in Time?
49:38 Quantum Entanglement and the Direction of Time.
55:10 Did Time Begin at the Big Bang?
45:00 Will Time End?
1:05:40 Chapter 5: Is Time Travel Possible?
Slavoj Žižek, Carlo Rovelli, Alenka Zupančič debate subjectivity, and how it relates to the world around it.
What does the hard problem get wrong?
With a free trial, you can watch the full debate NOW at https://iai.tv/video/the-self-and-the… tend to think of ourselves as observers of the world and experience as something different from the material stuff that makes up reality. Yet at the same time as human beings, we are at once part of the universe and part of that reality. And this profoundly puzzling relationship, that we are both part of something and yet separate from it, has been at the centre of Western thought. Materialists claim there is only physical material. But if so, thought, experience, and consciousness become illusory. Idealists argue there is only consciousness, but then it is reality that becomes an illusion. While dualists hold that both the self and the world exist, but that the connection between the two is mysterious. Is the self part of the world or necessarily outside of it? Was Kant right that the distinction between subject and object is necessary for experience to be possible? Or are these deep metaphysical questions beyond us, and our theories and language incapable of uncovering the ultimate state of things? #zizek #philosophy #physics #consciousness #quantum #quantumphysics Slavoj Žižek is one of the most famous philosophers in the world and is the author of more than 50 books, including most recently at the time of the debate Zero Point. Alenka Zupančič is a leading Lacanian philosopher and social theorist. She is a professor at The European Graduate School and at the University of Nova Gorica. Joining from America, Carlo Rovelli is a leading theoretical physicist, the author of several best-selling books, and a founding figure in the field of quantum gravity. His recent book, Reality Is Not What It Seems, has ethical implications for the nature of the self and personal identity. Jack Symes hosts. 00:00 Introduction 00:37 Carlo Rovelli on reality 05:22 Alenka Zupančič: is our knowledge incomplete, or reality itself? 07:55 Slavoj Žižek: how can a stone have freedom? 09:28 Carlo Rovelli on freedom 11:17 Can we ever resolve the relationship between the self and the world around us? 11:35 The problem with David Chalmers The Institute of Art and Ideas features videos and articles from cutting edge thinkers discussing the ideas that are shaping the world, from metaphysics to string theory, technology to democracy, aesthetics to genetics. Subscribe today! https://iai.tv/subscribe?utm_source=Y… For debates and talks: https://iai.tv For articles: https://iai.tv/articles For courses: https://iai.tv/iai-academy/courses.
We tend to think of ourselves as observers of the world and experience as something different from the material stuff that makes up reality. Yet at the same time as human beings, we are at once part of the universe and part of that reality. And this profoundly puzzling relationship, that we are both part of something and yet separate from it, has been at the centre of Western thought. Materialists claim there is only physical material. But if so, thought, experience, and consciousness become illusory. Idealists argue there is only consciousness, but then it is reality that becomes an illusion. While dualists hold that both the self and the world exist, but that the connection between the two is mysterious.
Is the self part of the world or necessarily outside of it? Was Kant right that the distinction between subject and object is necessary for experience to be possible? Or are these deep metaphysical questions beyond us, and our theories and language incapable of uncovering the ultimate state of things?
#zizek #philosophy #physics #consciousness #quantum #quantumphysics.
Superconducting materials could play a crucial role in the energy-efficient applications of the future. However, several technical challenges still stand in the way of their practical use. Now, researchers at Chalmers University of Technology in Sweden have developed a new material design that addresses a major obstacle in the field: enabling superconductivity to operate at higher temperatures while also withstanding strong magnetic fields. This breakthrough could pave the way for far more energy-efficient electronics and quantum technologies.
Digital devices, data centers and information and communications technology (ICT) networks currently account for approximately 6% to 12% of global electricity consumption. There is a substantial and growing need for more energy-efficient electronics and this is where superconducting materials have emerged as a promising solution. Unlike conventional electronics, which lose energy as heat, superconductors can conduct electricity with zero energy loss. Thus, superconductors have the potential to make power grids, electronics and quantum technologies hundreds of times more energy efficient.
However, the path to real-world applications is still blocked by several key challenges. One major obstacle is that superconducting states often require extremely low temperatures—down to around −200°C. Cooling to such temperatures is complex and energy-intensive. Another major challenge is that superconductivity can be weakened or destroyed by strong magnetic fields. This is a critical limitation, as magnetic fields are often present in advanced electronic devices and are essential to many quantum technologies.
You’re late for an important appointment. Just as you are leaving your house, you realize your phone is flat. Imagine you could charge it almost instantly by exploiting the strange rules of quantum physics. That’s the promise of quantum batteries.
My colleagues and I at CSIRO have developed the world’s first quantum battery prototypes —and the direction the technology has taken is surprising.
Quantum computers could solve certain problems that would take traditional classical computers an impractically long time to solve. At the Japan Advanced Institute of Science and Technology (JAIST), researchers are now working to make these systems reliable and trustworthy.
Unlike classical computers that process information in binary digits (bits) as either 0 or 1, quantum computers use quantum bits or “qubits” that can represent both 0 and 1 simultaneously, enabling dramatic speedups in computations for specific problems.
The potential applications of quantum computing are wide-ranging. These include factoring large numbers that could break today’s encryption, optimizing complex industrial processes, accelerating drug discovery, and supporting advances in artificial intelligence (AI).
Quantum communication systems are emerging solutions to transmit information between devices in a network leveraging quantum mechanical phenomena, such as entanglement. Entanglement is a quantum effect that entails a link between two or more particles that share a unified state even at a distance, so that measuring one instantly affects the other.
Like most quantum systems, quantum communication networks are typically highly sensitive to changes and disturbances in the environment, also referred to as noise. Random changes in temperature, as well as random energy caused by heat (i.e., thermal noise), can disrupt the connections in a quantum network, making the reliable transfer of quantum states challenging.
Researchers in Shenzhen, China have demonstrated a quantum network that relies on microwave photons, low-energy light particles and a superconducting transmission line. Their paper, published in Nature Electronics, introduces a promising approach to reduce thermal noise in this network, enabling the reliable transmission of quantum states between distant devices.