Physics Articles

planck

A Hand-Wavy Discussion of the Planck Length

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The Planck length is an extremely small distance constructed…
spacetime2

Struggles With The Continuum - Part 2

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  Last time we saw that that nobody yet knows if…
animalspeeds

Scaling Laws and the Speed of Animals

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

Questions About Infinity

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

Struggles With the Continuum - Part 1

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  Is spacetime really a continuum?  That is, can…
photoelectric

"Violating" Einstein's Photoelectric Effect Model

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One of the most spectacular theoretical descriptions that Einstein…
CosmologicalHorizons

Inflationary Misconceptions and the Basics of Cosmological Horizons

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

Relativistic Work-Kinetic Energy Theorem

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

Emergence from the Superpoint

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  In the previous article we saw that the generalization…
liealgebra

Homotopy Lie-n Algebras in Supergravity

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  The previous article in this series claimed that…
string theory

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

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    While the world didn't end, after all,…
hupmisconceptions1

Misconception of the Heisenberg Uncertainty Principle

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One of the common misconception about the Heisenberg Uncertainty…
errorbars

Plus/minus What? How to Interpret Error Bars

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People some times find themselves staring at a number with a…
LCDM4

Approximate LCDM Expansion in Simplified Math (Part 4)

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  Part 4: Cosmic Recession Rates An astronomer, accompanied…
LCDM3

The LCDM Cosmological Model in Simplified Math (Part 3)

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  Part 3: Important Cosmological Horizons and Distances A…
lcdmjorrie

Approximate LCDM Expansion in Simplified Math (Part 2)

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

Neutrino Masses and Speed

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

Understanding the General Relativity View of Gravity on Earth

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Often students have difficulty reconciling the General Relativity…
cosmo

Approximate LCDM Expansion in Simplified Math

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

Science for Love or for Money

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

Measuring Quantum Entanglement?

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

My Superparticle Bet with Frank Wilczek

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There is an interesting story unfolding in particle physics.…
qftintegrals

Some Useful Integrals In Quantum Field Theory

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

Retrocausality: How Fundamental is the Arrow of Time?

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

Initiating Research Work

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

Causal Perturbation Theory

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Relativistic quantum field theory is notorious for the occurrence…
cheshirecat

Weak Values Part 2: The Quantum Cheshire Cat Experiment

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

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

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

Negative absolute temperatures

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

What is Energy?

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

LHC Part 3: Protons as Large as a Barn

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

Measuring How Many Days Are in a Year

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

The Greenberger-Horne-Zeilinger Experiment

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

The Quantum Liar Experiment: An Instantiation of the Mermin Device

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

Some Sins in Physics Didactics

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Introduction There are many sins in physics didactics. Usually…

LHC Part 2: Commissioning

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