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!

Quantum Eraser

The Quantum Mystery of Wigner's Friend

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

A Numerical Insight for the Fundamental Theorem of Calculus

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The purpose of this article is not to provide some rigorous statement,…
Super Quantum

The Unreasonable Effectiveness of the Popescu-Rohrlich Correlations

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

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…
tensor calculus

The 10 Commandments of Index Expressions and Tensor Calculus

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

Direct Echo-Based Measurement of the Speed of Sound

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

How to Better Define Information in Physics

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When I ask questions about conservation of information I frequently…
bizarro_univerise

Lessons From the Bizzaro Universe

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

Either the Sun Is Getting Smaller or Gravity Is Getting Weaker

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Paper discussion: Solar system expansion and strong equivalence…
statmech2

Statistical Mechanics: The Ideal Gas

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

"Classical Physics Is Wrong" Fallacy

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

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…
qft_freequantum

Mathematical Quantum Field Theory - Free Quantum Fields

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This is one chapter in a series on Mathematical Quantum Field…
bb_infinity2

Intro to Big Bang and Infinity Concepts

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This article is part of our student writer series. The writer…
journeycosmos3

A Journey Into the Cosmos - FLRW Metric and The Friedmann Equation

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This article is part of our student writer series. The writer…
qm_interpretations

The Fundamental Difference in Interpretations of Quantum Mechanics

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

Mathematical Quantum Field Theory - Quantization

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

Coordinate Dependent Statements in an Expanding Universe

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In this Insight we will discuss the general Robertson--Walker…
gps3

The Schwarzschild Metric: A Newtonian Comparison

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A Short Proof of Birkoff's Theorem derived the Schwarzschild…
gps2

The Schwarzschild Metric: The Photon Sphere

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

Mathematical Quantum Field Theory - Gauge Fixing

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The following is one chapter in a series of Mathematical Quantum…
gps1

The Schwarzschild Metric: GPS Satellites

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 A Global Positioning System (GPS) device gives your…
cosmosintro

A Journey Into the Cosmos - The Friedmann Equation

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 This article is part of our student writer series.…
qtf_phased_space

Mathematical Quantum Field Theory - Reduced Phase Space

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

Mathematical Quantum Field Theory - Gauge Symmetries

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

Mathematical Quantum Field Theory - Propagators

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

Mathematical Quantum Field Theory - Phase Space

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

Mathematical Quantum Field Theory - Observables

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

Mathematical Quantum Field Theory - Symmetries

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

Mathematical Quantum Field Theory - Lagrangians

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This is one chapter in a series on Mathematical Quantum Field…
qtf_field_variations2

Mathematical Quantum Field Theory - Field Variations

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

Using the Spaghetti-Twist to Align DNA

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

Mathematical Quantum Field Theory - Fields

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

Mathematical Quantum Field Theory - Spacetime

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

Mathematical Quantum Field Theory - Geometry

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

A First Idea of Quantum Field Theory - 20 Part Series

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These notes mean to give an expository but rigorous introduction…
perturbation

Introduction to Perturbative Quantum Field Theory

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

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…
inflation5

A Poor Man's CMB Primer: Quantum Seeds

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 The CMB establishes a record of ancient acoustic…
epsresults

Results Shown at EPS Conference

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