Language · Media · Problem

Wavepackets and uncertainty principle

[Preliminary 11-11-2023] [“Quantum foundations” series] Table of contents Context This post was inspired by Don Lincoln’s latest YouTube video (below). Insights from quantum field theory (QFT) have helped me better understand strange aspects of quantum theory [1]. In particular, leaving behind notions of point particles and wave-particle duality, and just going with fields and wavepackets in… Continue reading Wavepackets and uncertainty principle

General · Language · Problem

Does antimatter ‘fall’ the same as matter? – QFT and CPT symmetry

[“Quantum foundations” series – QFT charge inversion] As discussed elsewhere (e.g., in “QFT – How many fields are there?” and comments), in the Standard Model, “there is one field for each kind of particle.” So, consider the positron – the “negative-energy solution” of the Dirac equation. It’s likely that electrons and positrons (anti-electrons) are localized… Continue reading Does antimatter ‘fall’ the same as matter? – QFT and CPT symmetry

General · Language · Media · Problem

Reckoning quanta, quantum events – nostalgia for absoluteness?

TABLE OF CONTENTS Alice & Bob et al. measure quantum states & wonder about predicting outcomes. In continuous quantum fields, localized disturbances (excitations) interact and exchange energy between fields – as real outcomes. “We suppress dimensions in order to make sense of things.” Modeling interactions of excitations with vacuum states of quantum fields gets weird.… Continue reading Reckoning quanta, quantum events – nostalgia for absoluteness?

Diagram · General · Language · Media

QFT – fields and wave packets

[“Quantum foundations” series] TABLE OF CONTENTS QUANTUM FIELD THEORY (QFT) LANDSCAPE Some recent articles prompted me to further explore (revisit once again, eh) some key features of quantum field theory (QFT). Without grasping all the esoteric math. As noted in a prior post (“QFT – How many fields are there?“), not all physicists tally these… Continue reading QFT – fields and wave packets

General · Language · Media · Problem

What the heck is quantum entanglement?

[“Communicating science” series] [“Quantum foundations” series] [“What the heck” series] I’ve written about entanglement in prior posts and comments. Over a year ago, I also wrote some preliminary notes. A recent issue of The Caltech Weekly (April 14, 2022) prompted this post. In part because of my ongoing search for better, more compelling analogies (for… Continue reading What the heck is quantum entanglement?

General · Language · Media · Problem

Reality of fields, language of particles – the Standard Model

[Communicating science] To understand contemporary physics, particularly quantum theory, the Standard Model is essential. This article includes an excellent video overview: • Quanta Magazine > Math Meets QFT > “A Video Tour of the Standard Model” by Kevin Hartnett, Senior Writer/Editor (July 16, 2021) (quote) Physicists would like to move beyond the Standard Model to… Continue reading Reality of fields, language of particles – the Standard Model

Diagram · General · Language · Problem

A particle by any other name?

[“What’s changed in the last ~50 years” series] Fundamental particles have properties; but not due to any constituents (cf. Feynman’s dilemma for an electron’s charge [1]). So, mathematical patterns of … localized “knots” (tangles or twists as in Möbius strips) – particular symmetries – of space-time energy? A landscape of colliding (interacting) ripples … How… Continue reading A particle by any other name?

General · Language · Problem

A force-less physics?

[“Quantum foundations” series] Force-less physics? No, I do NOT mean that the language of forces (electromagnetism, strong, weak, gravity) does not apply to our everyday experience or to physical descriptions. But only to a point, yes, as maybe counterproductive to deeper understanding. To getting beyond the Standard Model [7]. To understanding how the wave function is… Continue reading A force-less physics?

General · Language · Media

Equal footing in quantum physics

So, regarding interaction of matter, there’s a major inversion of perspective between classical physics and quantum field theory (QFT): hallmarked particles which create fields vs. excitations created (and destroyed) in ubiquitous extant fields. As Ethan Siegel said: … in quantum field theory, quantum fields aren’t generated by matter. Instead, what we interpret as “matter” is… Continue reading Equal footing in quantum physics

General · Language

QFT – How many fields are there?

[“Building a ‘verse” series] Ever since I started reading about Quantum Field Theory (QFT), I was interested in how physicists talk about fields. And the multiplicity of fields. And how quantum fields compare to classical fields. So, as I’ve written elsewhere, the basic notion is that every matter particle is an excitation (or localized vibration)… Continue reading QFT – How many fields are there?