## Posts

- “Violating” Einstein’s Photoelectric Effect Model
- 11d Gravity From Just the Torsion Constraint
- 15 of the Best PF 2017 Eclipse Photos
- 5 Common MATLAB Error Messages and How to Fix Them
- A Brachistochrone Subway Is Not a Cost-effective Idea
- A Brief on the Expansion of the Universe
- A Continuous, Nowhere Differentiable Function: Part 1
- A Continuous, Nowhere Differentiable Function: Part 2
- A Geometrical View of Time Dilation and the Twin Paradox
- A Hand-Wavy Discussion of the Planck Length
- A Partial “Derivation” of Gauss’s Law
- A Poor Man’s CMB Primer. Part 1: Orientation
- A Poor Man’s CMB Primer. Part 2: The Birth of a Cosmic Background Radiation
- A Poor Man’s CMB Primer. Part 3: Bumps on a Blackbody
- A Poor Man’s CMB Primer. Part 4: Cosmic Acoustics
- A Poor Man’s CMB Primer. Part 5: Quantum Seeds
- A Problem From “Incandescence”
- A Short Proof of Birkhoff’s Theorem
- AC Power Analysis: Part 1, Basics
- AC Power Analysis: Part 2, Network Analysis
- AC Power Analysis: Part 3, Cyber Resilience
- Acoustic ‘beats’ from Mismatched Musical Frequencies
- Administering TCP/IP In Automation or Measurement Networks
- Advanced Astrophotography Tips
- All about Earth’s Gravity
- All About Ice – Trivia
- Alternative Careers for a Physics Graduate
- Am I Cut Out for Mathematics or Sciences?
- An Integral Result from Parseval’s Theorem
- Anyon Demystified
- Applying for Physics Graduate School
- Approximate LCDM Expansion in Simplified Math
- Approximate LCDM Expansion in Simplified Math (Part 2)
- Approximate LCDM Expansion in Simplified Math (Part 4)
- Assessing the Physics in Edmond Hamilton’s “The Second Satellite”
- At What Velocity Does the Universe Expand? Can It Be Faster than Light?
- Atomic Positioning with DNA Hinges
- Basic Kinematics
- Behind MathJax: Peter Krautzberger
- Blaming Government for Teacher and Scientist Failures in Integrity
- Blockworld and Its Foundational Implications Part 1: Time Dilation and Length Contraction
- Blockworld and Its Foundational Implications Part 2: The Relativity of Simultaneity and Blockworld
- Blockworld and its Foundational Implications Part 3: General Relativity and the Big Bang
- Blockworld and its Foundational Implications Part 4: General Relativity and Closed Timelike Curves
- Blockworld and its Foundational Implications Part 5: Delayed Choice and No Counterfactual Definiteness
- Building a Definition for Heat
- Can Angles be Assigned a Dimension?
- Can Gene Editing Eliminate Alzheimer’s Disease?
- Can I Send a Signal Faster than Light by Pushing a Rigid Rod?
- Can We See an Atom?
- Can We Tell Whether the Universe Is Rotating?
- Causal Perturbation Theory
- Centrifugal Force Reversal Near A Black Hole
- Choosing a Research Area and an Advisor
- Complex and Irrational Exponents for the Layman
- Computer Language Primer – Part 1
- Conceptual Difficulties in the Roles of Variables
- Could Redshifts Be Intrinsic Rather than Cosmological?
- Damped Motion in Classical and Quantum Mechanics
- Digital Camera Buyer’s Guide: Compact Point and Shoot
- Digital Camera Buyer’s Guide: DSLR
- Digital Camera Buyer’s Guide: Introduction
- Digital Camera Buyer’s Guide: Real Cameras
- Digital Camera Buyer’s Guide: Tripods
- Do Black Holes Really Exist?
- Do Photons have Mass?
- Do Photons Move Slower in a Solid Medium?
- Does Gravity Gravitate?
- Does Gravity Gravitate? Part 2
- Does Gravity Gravitate? Part 3 – The Wave
- Does the Heisenberg Uncertainty Principle Imply Energy Nonconservation?
- Don’t Fear the CRISPR: Why New Gene Editing Technologies Won’t Lead to Designer Babies
- Early Physics Education in High Schools
- Elementary Construction of the Angular Velocity
- Emergence from the Superpoint
- Energy Gained by Charge in an Electrostatic Field
- Entanglement Entropy – Part 1: Quantum Mechanics
- Entanglement Entropy – Part 2: Quantum Field Theory
- Entering Physics Graduate School From Another Major
- Examples of Prequantum Field Theories I: Gauge Fields
- Examples of Prequantum Field Theories II: Higher Gauge Fields
- Examples of Prequantum Field Theories III: Chern-Simons-type Theories
- Examples of Prequantum Field Theories IV: Wess-Zumino-Witten-type Theories
- Explaining Rolling Motion
- Exploring the Spectral Paradox
- Explosion-Generated Collapsing Vacuum Bubbles Reach 20,000 Kelvin
- Fabry-Perot and Michelson Interferometry: A Fundamental Approach
- Fake News and Science Reporting
- False Dichotomy: Theorist or Experimentalist?
- First years of Graduate School from Being a TA to the Graduate Exams
- Frames of Reference: A Skateboarder’s View
- Frames of Reference: Linear Acceleration View
- Frenet Equations in 2-D Which Result in the Cornu Spiral
- Frequently Made Errors – Pseudo and Resultant Forces
- Frequently Made Errors in Climate Science – The Greenhouse Effect
- Frequently Made Errors in Equation Handling
- Frequently Made Errors in Heat – Elementary Level
- Frequently Made Errors in Mechanics – Friction
- Frequently Made Errors in Mechanics – Hydrostatics
- Frequently Made Errors in Mechanics – Kinematics
- Frequently Made Errors in Mechanics – Moments
- Frequently Made Errors in Mechanics – Momentum and Impacts
- Frequently Made Errors in Mechanics – Springs
- Frequently Made Errors in Mechanics: Forces
- Frequently Made Errors in Probability – Conditionals in Natural Language
- Frequently Made Errors in Probability – Continuous and Discrete Distributions
- Frequently Made Errors in Vectors – Elementary Use
- Friends, Strangers, 7825 and Computers
- Fun with Self-Avoiding Walks
- General Brachistochrone Problem
- General Relativity as a Gauge Theory
- Getting a Physics Job!
- Grandpa Chet’s Entropy Recipe
- Groups and Geometry
- Guide to Publishing in Peer Reviewed Journals
- High Temperature Low Temperature Duality for the Ising Model on an Infinite Regular Tree
- Higher Prequantum Geometry I: The Need for Prequantum Geometry
- Higher Prequantum Geometry II: The Principle of Extremal Action – Comonadically
- Higher Prequantum Geometry III: The Global Action Functional – Cohomologically
- Higher Prequantum Geometry IV: The Covariant Phase Space – Transgressively
- Higher Prequantum Geometry V: The Local Observables – Lie Theoretically
- History’s First Science Experiments
- Homotopy Lie-n Algebras in Supergravity
- How Does an Airplane Wing Work: a Primer on Lift
- How Fast Do Changes in the Gravitational Field Propagate?
- How I Overcame Learning Challenges That I Faced Studying STEM
- How I Stopped Worrying and Learned to Love Orthodox Quantum Mechanics
- How Representative is the Night Sky?
- How to Become a Medical Physicist in 3653 Easy Steps
- How to Self Study Analysis. Part I: Intro Analysis
- How to Self Study Geometry. Part I: Pure Geometry
- How to Self-study Algebra: Linear Algebra
- How to Self-Study Algebra. Part II: Abstract Algebra
- How to Self-study Analysis. Part II: Intermediate Analysis
- How to Self-Study Basic High School Mathematics
- How to Self-Study Calculus
- How to Study Mathematics
- How to Tell Operations, Operators, Functionals and Representations Apart
- How Well Do You Know Albert Einstein?
- Imagination Without Knowledge Is Ignorance Waiting to Happen
- In High School and Want to Do Advanced Mathematics?
- Inflationary Misconceptions and the Basics of Cosmological Horizons
- Informal Introduction to Cardinal Numbers
- Initiating Research Work
- Intermediate Astrophotography Tips
- Interview with a Biophysicist: Andy Resnick
- Interview with a Chem-Physicist: DrClaude
- Interview with a Chemist: Borek
- Interview with a Mathematical Physicist: John Baez Part 1
- Interview with a Mathematical Physicist: John Baez Part 2
- Interview with a Physicist: David Hestenes
- Interview with a Physicist: David J. Griffiths
- Interview with a Physicist: Doc Al
- Interview with a Physicist: Sean Carroll
- Interview with a Physicist: ZapperZ
- Interview with a Physics Mentor: Nugatory
- Interview with a Physics Mentor: PeterDonis
- Interview with a Theoretical Physicist: Carlo Rovelli
- Interview with a Theoretical Physicist: Garrett Lisi
- Interview with a Theoretical Physicist: Sabine Hossenfelder
- Interview with an Electrical Engineer: Berkeman
- Interview with an Engineer: Russ Watters
- Interview with Astronomer Pamela Gay
- Interview with Biologist Jim McNamara
- Interview with Instrument Engineer Jim Hardy
- Interview with Mathematician Fresh_42
- Interview with Physics Mentor: Stevendaryl
- Interview with Science Advisor DrChinese
- Introduction to Astrophotography
- Introduction to Perturbative Quantum Field Theory
- Irrationality for Dummies
- Is the Universe a Black Hole?
- Is There a Rigorous Proof Of 1 = 0.999…?
- It Was 20 Years Ago Today — the M-theory Conjecture
- It’s Elemental! The Periodic Table Quiz
- Knut Lundmark and the Prehistory of Dark Matter
- Lenses and Pinholes: What Does “In Focus” Mean?
- LHC Part 2: Commissioning
- LHC Part 3: Protons as Large as a Barn
- LHC Part 4: Searching for New Particles and Decays
- LightCone7 Tutorial Part III – How Things are Computed
- LightCone7Combo Tutorial Part I
- LightCone7Combo Tutorial Part II – Charts
- Math and the Obvious
- Mathematical Preparations
- Matrix Representations of Linear Transformations
- Measuring How Many Days Are in a Year
- Measuring Quantum Entanglement?
- Misconceiving Mutual Inductance Coefficients
- Misconception of the Heisenberg Uncertainty Principle
- Misconceptions about Virtual Particles
- Modulation vs. Beating Confusion
- My Superparticle Bet with Frank Wilczek
- Name the Science Photo
- Name the Scientist
- Negative absolute temperatures
- Neutrino Masses and Speed
- New High Performance Ultra-wide Angle Lenses
- Niches for Publishable Undergraduate Research
- Ohm’s Law Mellow
- Omissions in Mathematics Education: Gauge Integration
- Oral Presentations
- Oral Presentations – Addendum
- Orbital Precession in the Schwarzschild and Kerr Metrics
- Partial Differentiation Without Tears
- Partial Fractions Decomposition
- Perfect Secrecy and the Unbreakable Cipher
- Permanent Magnets Explained by Magnetic Surface Currents
- PF Insight Scavenger Hunt 2
- PF Insights Scavenger Hunt
- PF’s policy on Lorentz Ether Theory and Block Universe
- Physics Blogs You Need to Be Reading
- Plus/minus What? How to Interpret Error Bars
- Polymer Physics and Genetic Sequencing
- Postdoctoral Physics Position
- Precession in Special and General Relativity
- Problems with Self-Studying
- Proofs in Mathematics
- Publishing in a Physics Journal
- Publishing in a Physics Journal (Addendum)
- Q&A With Universe Today’s Fraser Cain
- Quantum Amplitudes, Probabilities and EPR
- Questions About Infinity
- Rainbows are not Vampires
- Rare Kinematic Formula
- Real Research in Unexpected Places – Backyards, Barns, Bayous
- Real Research in Unexpected Places – Boat Ramps
- Reflections on Product Quality
- Relativistic Work-Kinetic Energy Theorem
- Relativity on Rotated Graph Paper
- Relativity Using the Bondi K-calculus
- Relativity Variables: Velocity, Doppler-Bondi k, and Rapidity
- Renormalisation Made Easy
- Representations and Why Precision is Important
- Research Work and The Lab Book
- Resources for High School Math at Home
- Resources for High School Physics at Home
- Results Shown at EPS Conference
- Retrocausality: How Fundamental is the Arrow of Time?
- Revamping Undergraduate Introductory Physics Laboratory
- Reversible Vs Irreversible Gas Compression/Expansion Work
- Roger Babson’s Anti-Gravity Contest
- Scaling Laws and the Speed of Animals
- Science for Love or for Money
- Scientific Inference P1: Logical induction ain’t logical
- Scientific Inference P2: We don’t need no stinkin’ induction
- Scientific Inference P3: Balancing Predictive Success with Falsifiability
- Secondary Forces Explored
- Secrets of Successful Science Projects
- See an Electron Lately?
- Simple Geometry, Deep Math
- Simple Python Debugging with Pdb: Part 1
- Simple Python Debugging with Pdb: Part 2
- So I Am Your Intro Physics Instructor
- So You Want to Go Back to School
- Solving Homogeneous Linear ODEs using Annihilators
- Solving Nonhomogeneous Linear ODEs using Annihilators
- Solving the Cubic Equation for Dummies
- Some Misconceptions on Indefinite Integrals
- Some Sins in Physics Didactics
- Some Useful Integrals In Quantum Field Theory
- Spacetime Diagrams of Light Clocks
- Spectral Standard Model and String Compactifications
- Steering: How the EPR-Paradox Fits Between Entanglement and Nonlocality
- Struggles with the Continuum – Conclusion
- Struggles With the Continuum – Part 1
- Struggles With The Continuum – Part 2
- Struggles With the Continuum – Part 3
- Struggles with the Continuum – Part 4
- Struggles with the Continuum – Part 5
- Struggles with the Continuum – Part 6
- Struggles with the Continuum – Part 7
- Super p-Brane Theory Emerging from Super Homotopy Theory
- Surviving the First Year of College
- Test Your NASA Knowledge
- Tetrad Fields and Spacetime
- The Balloon Analogy … the Good, the Bad, and the Ugly
- The Basics of Positron Emission Tomography (PET)
- The Block Universe – Refuting a Common Argument
- The Case for Learning Complex Math
- The Complexity of Modern Science
- The Diffraction Limited Spot Size with Perfect Focusing
- The Greenberger-Horne-Zeilinger Experiment
- The History and Concept of the Number 0
- The Interaction of Sound and Light
- The Isaac Newton Quiz
- The Joy of Processing
- The LCDM Cosmological Model in Simplified Math (Part 3)
- The Life of a Physics Major
- The Millennium Prize Problems: Part I
- The Monographic Substitution Cipher: From Julius Caesar to the KGB
- The Moon Quiz
- The Most Important Thing You Can Learn from Physics Forums
- The Need of Infinity in Physics
- The Pantheon of Derivatives – 5 Part Series
- The Pantheon of Derivatives – Part II
- The Pantheon of Derivatives – Part III
- The Pantheon of Derivatives – Part IV
- The Pantheon of Derivatives – Part V
- The Physics of Virtual Particles
- The Quantum Liar Experiment: An Instantiation of the Mermin Device
- The Revival of Newton-Cartan Theory
- The Schwarzschild Geometry: Part 1
- The Schwarzschild Geometry: Part 2
- The Schwarzschild Geometry: Part 3
- The Schwarzschild Geometry: Part 4
- The Speed of Light and Galilean Relativity
- The US Graduate School System
- The Vacuum Fluctuation Myth
- Things Which Can Go Wrong with Complex Numbers
- Think You Know about the LHC?
- Think You Know Pluto?
- Think You Know Richard Feynman?
- Think You Know Stephen Hawking
- Time Dilation and Redshift for a Static Black Hole
- Time Synchronization Across Switched Ethernet
- Tools to Enrich our Quantum Mechanics Interpretations Discourse
- Trials and Tribulations of a Physicist who Became a Math Geek
- Trick to Solving Integrals Involving Tangent and Secant
- Understanding Buoyancy: The Limits of Archimedes
- Understanding Entropy and the 2nd Law of Thermodynamics
- Understanding Retrocausality
- Understanding the General Relativity View of Gravity on Earth
- Using the Fourier Series To Find Some Interesting Sums
- Vacuum Fluctuations in Experimental Practice
- Very Little Excuse To Ask A Question Cold
- Visualizing the 2-D Particle in a Box
- Was the Early Universe in a Disordered State?
- Weak Values Part 1: “Asking Photons Where They Have Been”
- Weak Values Part 2: The Quantum Cheshire Cat Experiment
- What Are Eigenvectors and Eigenvalues?
- What Causes Cancer: Bad Luck or Bad Lifestyles?
- What Happens When You Flip the Light Switch?
- What Is a Tensor?
- What is Energy?
- What is relativistic mass and why it is not used much?
- What Is the Bell Spaceship Paradox, and How Is It Resolved?
- What Is The Most Important Thing That You Learned?
- What Is the Steady-state Model, and Why Is It No Longer Viable?
- What to Expect from Graduate School Before You Get There
- When did Mitochondria Evolve?
- Where Did the Big Bang Happen?
- Which Scientist Said What
- Why Can’t My Computer Do Simple Arithmetic?
- Why Do People Say That 1 And .999 Are Equal?
- Why Does C Have a Particular Value, and Can It Change?
- Why Don’t Electrons Crash into the Nucleus in Atoms?
- Why Higher Category Theory in Physics?
- Why Is Acceleration Due to Gravity a Constant?
- Why Is Quantum Mechanics So Difficult?
- Why is the Radius of the Observable Universe in Light-years Greater than Its Age?
- Why Is the Speed of Light the Same in All Frames of Reference?
- Why Renormalisation Needs a Cutoff
- Why Road Capacity Is Almost Independent of the Speed Limit
- Why Study Physics? A Bit Goes a Long Way!
- Why Supersymmetry? Because of Deligne’s theorem.
- Why Won’t You Look at My New Theory?
- Why You Should Not Use Wikipedia As Your Primary Source
- Will All Matter Be Converted to Photons?
- Writing a Master Degree Thesis
- Writing Your Doctoral Thesis/Desertation
- You Will Not Tunnel Through a Wall
- Your Curriculum Vitae
- Your Physics Thesis Defense
- Your Software is Never Perfect