#physics

In a recent talk, Stephen Wolfram argues that computation, rather than traditional physics, is the fundamental principle underlying the universe. He presents his concept of the "ruliad," a vast computational space from which all physical laws and phenomena emerge.

The comic imagines a cosmic entity or "hole" that passes through Earth, causing widespread destruction as it traverses cities and landmarks. The scene visualizes the aftermath of this catastrophic event in a dramatic, large-scale illustration.

The Johnson thermoelectric energy converter (JTEC) is a solid-state heat engine that converts heat into electricity without moving parts, using hydrogen circulation between two cells at different temperatures to generate voltage.

A new study suggests that the universe may require less dark matter than previously thought, potentially challenging existing models and reshaping our understanding of cosmic structure formation.

An 1884 essay explores the concept of a fourth spatial dimension using analogies like Flatland to explain how a higher-dimensional being might interact with our three-dimensional world.

The essay examines the extreme proliferation of fireworks displays, calculating that in some peak seasons, fireworks are launched at rates of 354 per second globally. It questions whether this scale of celebration, with its environmental and noise impacts, is truly a good idea, urging reflection on the costs of entertainment.

The paper introduces Lean4Physics, a reasoning framework for college physics built in Lean4. It formalizes physical concepts and theorems to enable rigorous, proof-based reasoning about physics problems, aiming to bridge the gap between natural language physics questions and formal verification.

Researchers have developed a modified mean-field theory to better understand the behavior of neural networks during training. The new approach accounts for correlations between weights and data, providing more accurate predictions than standard mean-field methods. This could lead to improved theoretical frameworks for analyzing deep learning models.

The article examines whether black hole singularities are real phenomena or mathematical artifacts of general relativity, noting that quantum gravity theories suggest they may not actually form.

The article presents a statistical interpretation of quantum mechanics, arguing that quantum theory can be understood as a statistical description of underlying deterministic processes rather than a fundamental departure from classical physics. It critiques the Copenhagen interpretation and suggests that many quantum phenomena arise from statistical regularities in complex systems.

The Particle Box is an interactive simulator that demonstrates the kinetic molecular theory by visualizing gas particles moving inside a box, colliding with walls and each other. Users can adjust parameters like temperature and number of particles to observe how these changes affect pressure and particle behavior in real-time.

Richard Feynman recounts fixing a broken adding machine during a job interview at a jewelry company, using careful reasoning and improvisation despite having no formal mechanical training.

This reply addresses critiques regarding the reliability of transport measurements for detecting topological gaps, defending the robustness of the approach while acknowledging certain limitations and clarifying methodological considerations.

The website presents a browser-based black hole simulator that visualizes gravitational lensing and spacetime distortion effects in real time, allowing users to interact with a simulated black hole environment.

The video explains the physics and operation of free electron lasers, covering how they generate coherent, high-power radiation by passing a relativistic electron beam through an undulator. It discusses key concepts like the resonance condition, gain, and the difference between oscillators and self-amplified spontaneous emission (SASE) configurations.

The article explains the fundamental physics principles behind quadcopter drone flight, including lift generation from spinning propellers, thrust vectoring for movement, and the control mechanisms (PID controllers) that stabilize the aircraft by adjusting motor speeds.

A Harvard physics student shares a curated list of recommended physics books, covering topics from introductory mechanics to advanced theoretical concepts, aimed at helping students and enthusiasts navigate essential readings in the field.

Physicists behind the ARC fusion power plant design hosted an Ask Me Anything session on Reddit's r/fusion community, answering questions about the compact, high-field tokamak concept being developed by Commonwealth Fusion Systems and MIT.

A paper airplane thrown in space would not fly like on Earth due to the lack of atmosphere to generate lift. Without air resistance, it would travel in a straight line at constant velocity indefinitely until acted upon by another force, such as gravity pulling it into an orbit or causing it to burn up upon re-entry.

A new theoretical model proposes that time may not be a fundamental property of reality but an emergent phenomenon arising from quantum entanglement. The idea suggests that time emerges from the correlations between entangled particles, potentially resolving longstanding paradoxes in physics by reframing time as an illusion rather than a fundamental dimension.

Lawrence M. Krauss presents the scientific case for how the universe could have arisen from nothing, drawing on quantum mechanics and cosmology to explain that empty space is inherently unstable and can produce matter and energy. He argues that the total energy of the universe may be zero, making a universe from nothing not only possible but likely given the laws of physics.

Avogadro's number (10^23) is close to the cube of the Planck-to-proton-mass ratio (~10^61), which also approximates the number of protons in the Sun. This coincidence relates to stars being just massive enough to sustain fusion, linking fundamental constants to stellar physics.

The article explores the philosophical and mathematical concept that the universe's complexity, including life, consciousness, and physical laws, emerges from a finite set of fundamental numbers and algorithmic processes, arguing that reality may be fundamentally computational at its core.

Antimatter consists of particles with the same mass as ordinary matter but opposite charge. When matter and antimatter meet, they annihilate in a burst of energy, a phenomenon studied by DOE scientists to understand the universe's matter-antimatter asymmetry.

Symmetry breaking in physics describes a phenomenon where a system that is symmetric under certain operations becomes asymmetric, often due to fluctuations or external influences. It plays a key role in phase transitions, particle physics (e.g., the Higgs mechanism), and the emergence of order in complex systems.

The article explores the ongoing debate in physics about the true number of elementary particles. While the Standard Model lists 17, questions remain about whether particles like the Higgs boson or neutrinos are truly fundamental, or if they are composed of even smaller entities, with some theories proposing hundreds or infinitely many.

The Church-Turing thesis is grounded in physical laws, not just mathematics. Physical reality imposes fundamental limits on computation, supporting a fact-based version of the thesis.

A Physics Stack Exchange discussion explains that kinetic energy increases with the square of speed (KE = ½mv²) rather than linearly because work required to accelerate an object depends on both force and distance, and at higher speeds, the distance over which force is applied increases, leading to a quadratic relationship.

A developer created a grilling calculator that uses thermal models, Fick's law of diffusion, and protein structures to derive optimal meat cooking results. The tool calculates salt timing (even for frozen meat), dry brine methods, and charcoal quantities based on physics. It is built as a pure ESM library for heat and salt diffusion, enabling further recipe development.

Physicists propose a "dark dimension" — a fifth dimension interacting only with dark matter and dark energy — that could mathematically link two of cosmology's greatest unknowns.