Articles

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…
ohmslaw

Ohm's Law Mellow

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At first I wanted this title to say “Ohm’s law is not a Law.” …
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…
quantumhard

Why Is Quantum Mechanics So Difficult?

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Strangely enough, QM's formalism isn't any more difficult than…
Supersymmetry

Why Supersymmetry? Because of Deligne's theorem.

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  In 2002, Pierre Deligne proved a remarkable theorem…
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…
polymer

Polymer Physics and Genetic Sequencing

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Introduction My main research focuses on using DNA molecules…
groupsandgeometry

Groups and Geometry

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There is a very deep link between group theory and geometry.…
computers

Friends, Strangers, 7825 and Computers

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This insight will be about Ramsey theory. Ramsey theory has its…

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". …
softwarenotperfect

Your Software is Never Perfect

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We occasionally have students ask for help on software, "My software…
Photoacoustic

The Interaction of Sound and Light

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I recently wrote a post on my blog about a fairly esoteric idea…
logicp3

Scientific Inference P3: Balancing Predictive Success with Falsifiability

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  Bayes' Theorem: Balancing predictive success with…
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…
acpoweranalysisp3

AC Power Analysis: Part 3, Cyber Resilience

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  Power system security is much too big a topic for…
nightsky

How Representative is the Night Sky?

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

Perfect Secrecy and the Unbreakable Cipher

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Is it possible to design an unbreakable cipher? Do methods of…
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,…
acpoweranalysisp2

AC Power Analysis: Part 2, Network Analysis

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  Let me use the terms “power grid” and “network”…
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…
acpoweranalysisp1

AC Power Analysis: Part 1, Basics

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  Instantaneous Power The formula for power is:…
cipher

The Monographic Substitution Cipher: From Julius Caesar to the KGB

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A monographic substitution cipher works by replacing individual…
pet_scan

The Basics of Positron Emission Tomography (PET)

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People often ask about the practical applications of fundamental…
tcp_ip

Administering TCP/IP In Automation or Measurement Networks

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The 1990s saw the widespread adoption of network technology on…
Ethernettime

Time Synchronization Across Switched Ethernet

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Now and then you come across measurement problems that are tightly…
qminterpret

Tools to Enrich our Quantum Mechanics Interpretations Discourse

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Introduction Many times, we encounter ourselves…
spacetime6

Struggles with the Continuum - Part 6

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  Last time I sketched how physicists use quantum…
Mitochondria

When did Mitochondria Evolve?

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Historically, life is categorized into three broad domains: bacteria,…
islingmodel

High Temperature Low Temperature Duality for the Ising Model on an Infinite Regular Tree

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Today I felt like sharing a computation that I thought was interesting.…
secondaryforces

Secondary Forces Explored

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Many are familiar with the "fundamental forces" of nature: gravity,…
complexmath

The Case for Learning Complex Math

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Resistance to complex math seems to never die out.  I see it…