Table of contents IntroductionAbout gamma photonsSolar gamma photons INTRODUCTION Rays, radiation, particles, waves, fields … what’s in a name, eh? There’s a history , an evolution of discovery and understanding. So that sometimes a “particle” by another name is something more interesting . While quantum field theory (QFT) has penetrated the way many physicists think… Continue reading Gamma photons – formerly known as rays – the extreme EM spectrum
The universe’s expansion history is one thing; but then there’s its structural evolution. In particular, how early did well-formed galaxies emerge? • Space.com > “Galaxies in early universe were surprisingly diverse, James Webb Space Telescope finds” by Andrew Jones (Jan 16, 2023) – high-redshift galaxies (galaxies as they were around 11 to 13 billion years… Continue reading How early did disk galaxies emerge?
[Draft] [“Quantum foundations” series] [“What’s changed in the last ~50 years” series] TABLE OF CONTENTS The buzz Proving that quantum entanglement is real Media articles Takeaways Notes Related posts THE BUZZ Much buzz on Tuesday October 4, 2022, as media marked the 2022 Nobel Prize in physics. So many articles – a hopeful indication regarding… Continue reading 2022 Nobel Prize – ‘spooky action’ pioneers
[“Quantum foundations” series] TABLE OF CONTENTS Quantum field theory (QFT) landscape Is QFT incomplete? Light speed sans mass The math of fields Excitations in cosmic microwave background Questions Visualizing wave packets QUANTUM FIELD THEORY (QFT) LANDSCAPE Some recent articles prompted me to further explore (revisit once again, eh) some key features of quantum field theory… Continue reading QFT – fields and wave packets
Update 7-15-2022 • NASA > APOD > “Webb’s Southern Ring Nebula” (July 14, 2022) Explanation: Cataloged as NGC 3132 the Southern Ring Nebula is a planetary nebula, the death shroud of a dying sun-like star some 2,500 light-years from Earth. Composed of gas and dust the stunning cosmic landscape is nearly half a light-year in… Continue reading Beyond Hubble – adventure begins for James Webb Space Telescope
[“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 ). 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?
Lots of media news this week, as the ISS celebrates 20 years [on November 2] of continuous human presence aboard the orbiting laboratory. • Overview of operations [PDF] The ISS is approximately 260 miles above the surface of the Earth, just a bit farther than the distance between Washington, D.C. and New York City. The… Continue reading Celebrating 20 Years of Human Presence on the ISS
[Communicating science series] This is a concept often espoused by science popularizers over the decades. Even the background for plot vouchers in some sci-fi adventures. An amazing fact: We and everyday objects around us are mostly empty space! So, miniaturize matter. Fantastic Voyage! Honey, I Shrunk the Kids. Downsizing. That’s why superman could walk through… Continue reading Our friend the atom, mostly empty space?
Ask people on the street “What are X-rays?” and you’ll likely get a variety of replies. About medical and dental X-rays. Stories about Superman’s X-ray vision. (Why does lead block X-rays?) Invisible particles that allow us to see through stuff. Technical explanations about electromagnetic radiation. So, street surveys typically reveal levels of understanding, which I’ll… Continue reading Levels of understanding – what are X-rays?
Much has been written about Richard Feynman. Many tributes and books. Feynman wrote some books as well. But the inspiration for this post is an exhibit promoted for Caltech’s 82nd Annual Seminar Day and Reunion Weekend May 16 – 19, 2019. The Mind’s Eye: Richard Feynman in Word & ImageIn work and play, Richard Feynman… Continue reading Feynman’s legacy — quantum originality