Physics Articles

Here contains the collection of expert physics articles that deal with physics topics. These span all skill ranges and may include astronomy and cosmology topics. Learn something new today by professionals in the fields you are interested in!

The Quantum Mystery of Wigner's Friend

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In this Insight I will introduce the quantum mystery called Wigner's…

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The Unreasonable Effectiveness of the Popescu-Rohrlich Correlations

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In this Insight, I will show how the Popescu-Rohrlich (superquantum)…

Why the Quantum | A Response to Wheeler's 1986 Paper

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Wheeler's opening statement in his 1986 paper, How Come the…

The 10 Commandments of Index Expressions and Tensor Calculus

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Having more than 10 years of experience in teaching vector and…

Direct Echo-Based Measurement of the Speed of Sound

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Figure 1: Distance vs. time a firecracker report echoed off…

How to Better Define Information in Physics

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When I ask questions about conservation of information I frequently…

Lessons From the Bizzaro Universe

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The terms Bizarro and Bizarro World originated in Superman comics,…

Either the Sun Is Getting Smaller or Gravity Is Getting Weaker

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Paper discussion: Solar system expansion and strong equivalence…

Statistical Mechanics: The Ideal Gas

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Read Part 1: Equilibrium Systems The Ideal Gas: Boltzmann's…

"Classical Physics Is Wrong" Fallacy

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One of the common questions or comments we get on PF is the claim…

Mathematical Quantum Field Theory - Renormalization

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This is one chapter in a series on Mathematical Quantum Field…

Mathematical Quantum Field Theory - Interacting Quantum Fields

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This is one chapter in a series on Mathematical Quantum Field…

Mathematical Quantum Field Theory - Free Quantum Fields

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This is one chapter in a series on Mathematical Quantum Field…

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The Fundamental Difference in Interpretations of Quantum Mechanics

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A topic that continually comes up in discussions of quantum mechanics…

Mathematical Quantum Field Theory - Quantization

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The following is one chapter in a series on Mathematical Quantum…

Coordinate Dependent Statements in an Expanding Universe

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In this Insight we will discuss the general Robertson--Walker…

The Schwarzschild Metric: A Newtonian Comparison

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A Short Proof of Birkoff's Theorem derived the Schwarzschild…

The Schwarzschild Metric: The Photon Sphere

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A Short Proof of Birkoff's Theorem derived the Schwarzschild…

Mathematical Quantum Field Theory - Gauge Fixing

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The following is one chapter in a series of Mathematical Quantum…

The Schwarzschild Metric: GPS Satellites

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A Global Positioning System (GPS) device gives your…

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Mathematical Quantum Field Theory - Reduced Phase Space

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The following is one chapter in a series on Mathematical Quantum…

Mathematical Quantum Field Theory - Gauge Symmetries

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This is one chapter in a series on Mathematical Quantum Field…

Mathematical Quantum Field Theory - Propagators

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This is one chapter in a series on Mathematical Quantum Field…

Mathematical Quantum Field Theory - Phase Space

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The following is one chapter of a series on Mathematical Quantum…

Mathematical Quantum Field Theory - Observables

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The following is one chapter in a series on Mathematical Quantum…

Mathematical Quantum Field Theory - Symmetries

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The following is one chapter in a series on Mathematical Quantum…

Mathematical Quantum Field Theory - Lagrangians

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This is one chapter in a series on Mathematical Quantum Field…

Mathematical Quantum Field Theory - Field Variations

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This is chapter 4 of a series on Mathematical Quantum Field Theory.The…

Using the Spaghetti-Twist to Align DNA

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A new paper from a collaboration of Canadian physicists has demonstrated…

Mathematical Quantum Field Theory - Fields

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The following is one chapter in a series on Mathematical Quantum…

Mathematical Quantum Field Theory - Spacetime

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The following is one chapter in a series on Mathematical Quantum…

Mathematical Quantum Field Theory - Geometry

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This is the first chapter in a series on Mathematical Quantum…

A First Idea of Quantum Field Theory - 20 Part Series

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These notes mean to give an expository but rigorous introduction…

Introduction to Perturbative Quantum Field Theory

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This is the beginning of a series that gives an introduction…

How I Stopped Worrying and Learned to Love Orthodox Quantum Mechanics

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Many people here know that I am a "Bohmian", i.e. an adherent…

15 of the Best PF 2017 Eclipse Photos

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The 2017 August Eclipse really was something special. Fortunately…

A Poor Man's CMB Primer: Quantum Seeds

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The CMB establishes a record of ancient acoustic…

Results Shown at EPS Conference

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The EPS conference was a week ago, and many new results and future…