Physics Articles


A Hand-Wavy Discussion of the Planck Length

The Planck length is an extremely small distance constructed…

Struggles With The Continuum - Part 2

  Last time we saw that that nobody yet knows if…

Scaling Laws and the Speed of Animals

In a recent issue of the American Journal of Physics, I read…

Questions About Infinity

Understanding the behaviour of infinity is one of the major accomplishments…

Struggles With the Continuum - Part 1

  Is spacetime really a continuum?  That is, can…

"Violating" Einstein's Photoelectric Effect Model

One of the most spectacular theoretical descriptions that Einstein…

Inflationary Misconceptions and the Basics of Cosmological Horizons

It is a common saying that during inflation "space expanded faster…

Relativistic Work-Kinetic Energy Theorem

I was bothered for a long time by the reasons for the relativistic…

Emergence from the Superpoint

  In the previous article we saw that the generalization…

Homotopy Lie-n Algebras in Supergravity

  The previous article in this series claimed that…
string theory

It Was 20 Years Ago Today -- the M-theory Conjecture

    While the world didn't end, after all,…

Misconception of the Heisenberg Uncertainty Principle

One of the common misconception about the Heisenberg Uncertainty…

Plus/minus What? How to Interpret Error Bars

People some times find themselves staring at a number with a…

Approximate LCDM Expansion in Simplified Math (Part 4)

  Part 4: Cosmic Recession Rates An astronomer, accompanied…

The LCDM Cosmological Model in Simplified Math (Part 3)

  Part 3: Important Cosmological Horizons and Distances A…

Approximate LCDM Expansion in Simplified Math (Part 2)

  Part 2: Time and Distance In Part 1 we have seen…

Neutrino Masses and Speed

It was hard to miss the 2011 OPERA neutrino speed measurement…

Understanding the General Relativity View of Gravity on Earth

Often students have difficulty reconciling the General Relativity…

Approximate LCDM Expansion in Simplified Math

  If we restrict ourselves to a spatially flat LCDM…
physics love

Science for Love or for Money

When I look over the most highly cited papers and my favorite…

Measuring Quantum Entanglement?

Though any pair of particles, given their history, might happen…

My Superparticle Bet with Frank Wilczek

There is an interesting story unfolding in particle physics.…

Some Useful Integrals In Quantum Field Theory

In my paper on renormalisation I mentioned what most who have…

Retrocausality: How Fundamental is the Arrow of Time?

In this Insight, I'll discuss a recent experiment ([1]  [2]…
research work

Initiating Research Work

    It has been a while since the last installment…
perbation theory

Causal Perturbation Theory

Relativistic quantum field theory is notorious for the occurrence…

Weak Values Part 2: The Quantum Cheshire Cat Experiment

In a previous Insight, Weak Values Part 1: "Asking Photons Where…

Weak Values Part 1: "Asking Photons Where They Have Been"

In a previous Insight on retrocausality, I explained an experiment…
negative temperature

Negative absolute temperatures

It's a famous result in thermodynamics that you can't reach absolute…
What is Energy

What is Energy?

What is energy? For some reason, this perfectly legitimate…

LHC Part 3: Protons as Large as a Barn

  See also part 1 and part 2 of the series. The…
earth year

Measuring How Many Days Are in a Year

How many days are there in a year? Ask pretty much anyone and…

The Greenberger-Horne-Zeilinger Experiment

In two previous Insights, I shared Mermin's explanation of…

The Quantum Liar Experiment: An Instantiation of the Mermin Device

In 1981, Mermin published a paper[1], "Bringing home the atomic…

Some Sins in Physics Didactics

Introduction There are many sins in physics didactics. Usually…

LHC Part 2: Commissioning

  Last month, I wrote a FAQ about working at the…