entanglement_entropy

Entanglement Entropy - Part 1: Quantum Mechanics

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Quantum Mechanics(QM) is one of the greatest intellectual achievements…
diffractiontheory

The Diffraction Limited Spot Size with Perfect Focusing

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Purpose:  The purpose of this Insights article is to give…
cornuspiral

Frenet Equations in 2-D Which Result in the Cornu Spiral

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This Insights article is intended as an introduction to the Frenet-Serret…
quantumflux

Vacuum Fluctuations in Experimental Practice

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This Insight Article is a sequel of the Insight Articles ”The…
magnet

Permanent Magnets Explained by Magnetic Surface Currents

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Introduction: The purpose of this Insight is to explain permanent…
highercategorytheory

Why Higher Category Theory in Physics?

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  This here is my personal story. For an alternative…
SchwarzschildGeometry3

The Schwarzschild Geometry: Part 3

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  When we left off in part 2, we were looking at…
quantumapplitudes

Quantum Amplitudes, Probabilities and EPR

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This is a little note about quantum amplitudes. Even though quantum…
vaccummyth

The Vacuum Fluctuation Myth

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This Insight Article is a sequel of the Insight Articles ”The…
anyon

Anyon Demystified

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Every quantum physicist knows that all particles are either bosons…
frameofreference2

Frames of Reference: A Skateboarder's View

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My essay Explaining Rolling Motion raised some commentary about…
relativitygauge

General Relativity as a Gauge Theory

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The fundamental interactions of the Standard Model are described…
quantumparticle

Spectral Standard Model and String Compactifications

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    The Connes-Lott-Chamseddine-Barrett model…
cmbprimer4

A Poor Man's CMB Primer. Part 4: Cosmic Acoustics

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  Before decoupling, photons and charged particles…
spacetimecon

Struggles with the Continuum - Conclusion

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  We've been looking at how the continuum nature…
11dgravity

11d Gravity From Just the Torsion Constraint

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  It is familiar that Einstein gravity may be formulated …
spacetime7

Struggles with the Continuum - Part 7

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  Combining electromagnetism with relativity and…
carcapacity

Why Road Capacity Is Almost Independent of the Speed Limit

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Let us start with a familiar situation. Take a familiar part…
Supersymmetry

Why Supersymmetry? Because of Deligne's theorem.

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    In 2002, Pierre Deligne proved a remarkable…
LHC4

LHC Part 4: Searching for New Particles and Decays

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  The LHC experiments are in full swing collecting…
acusticbeats

Acoustic 'beats' from Mismatched Musical Frequencies

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In late high school physics courses and first year university…

Spacetime Diagrams of Light Clocks

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We demonstrate a method for constructing spacetime diagrams for…

A Problem From "Incandescence"

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The following problem was inspired by reading Greg Egan's "Incadescence". …
Photoacoustic

The Interaction of Sound and Light

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I recently wrote a post on my blog about a fairly esoteric idea…
logicp2

Scientific Inference P2: We don't need no stinkin' induction

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  Part 2. "We don't need no stinkin' induction" --…
antigravity

Roger Babson's Anti-Gravity Contest

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In the early 20th century, an eccentric businessman named Roger…
logic1

Scientific Inference P1: Logical induction ain't logical

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  Three million years ago, the grandfathers of our…
virtualparticlesmyths

Misconceptions about Virtual Particles

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This Insight Article is a sequel of the Insight Article ''The…
nightsky

How Representative is the Night Sky?

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A couple of weeks back, a thread was started about whether or…
quantumentanglement

Steering: How the EPR-Paradox Fits Between Entanglement and Nonlocality

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If we violate a Bell inequality, we know we have quantum entanglement,…
Newton-Cartan-Theory

The Revival of Newton-Cartan Theory

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It's a calculation which you can find in any textbook on General…
virtualparticles

The Physics of Virtual Particles

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In discussions on the internet (including a number of wikipedia…
universeexpand

A Brief on the Expansion of the Universe

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The "ordinary Big Bang and expansion" (no inflation, no dark…