I generally get the difference between matter particles (leptons and quarks) and “force carrying” particles (bosons). But I still do not understand how the “exchange” of fundamental / elementary bosons (e.g., photons and gluons) bind or ‘glue’ matter particles together as well as repel matter particles — as in attraction of oppositely charged particles and… Continue reading A boson by any other name would …
I just added another “big science” ground telescope to my Experiments page — the GMT. Astronomers claim that the images from these giant telescopes will be better than those sent to earth by the Hubble space telescope. Yet another in Chile. Then I recalled recently reading about Chile as an astronomer’s paradise. Here’s a sampling… Continue reading An astronomer’s paradise — Chile
This Space.com article “NASA Unveils Amazing Cosmic Views as Chandra X-Ray Observatory Turns 20” (July 28, 2019) reminded me of the limited vision provided only with visible light. Consumer security (and other) cameras have accustomed more of us to regularly seeing infrared light (a longer wavelength part of the electromagnetic spectrum). And that “light” behaves… Continue reading Celebrating X-Ray Astronomy — Chandra
[Topic placeholder] [Developing story] Today’s news cycle contains articles about research by some physicists at the University of Glasgow who claim to have imaged entangled photons. Looks like they used a precision laser-based, table-top optical bench system. This Cnet article is a basic summary of the research: “Einstein called it ‘spooky action.’ Here’s an image… Continue reading Image of entangled photons?
Before encountering this Quanta Magazine article today, I’d not heard of this aspect of quantum measurement theory: “The Quantum Theory That Peels Away the Mystery of Measurement” (July 3, 2019) by Philip Ball, Contributing Writer (author of Beyond Weird: Why everything you thought you knew about quantum physics is different). Well, a quick Google search… Continue reading Quantum trajectory theory?
[“Models of the quantum vacuum” series] I read this article today “‘The Unknown Question’ — The End of Spacetime” (June 22, 2019) and watched the included YouTube videos. Something bothered me which I’ve been thinking about for years, namely, that even theoretical physicist Nima Arkani-Hamed sounded like he viewed the electron as like a spherical… Continue reading Swaying quantum vacuum energy vs compelling charge
[Draft] [“Building a ‘verse” series] Reference: “How Many Fundamental Constants Does It Take To Explain the Universe?” by Ethan Siegel (Nov 23, 2018). Quite a large number of fundamental constants are required to describe reality as we know it … The fundamental constants … describe the strengths of all the interactions and the physical properties… Continue reading Defining a universe — how many constants?
[Draft] [“Building a ‘verse” series] I’ve cited this physicist’s video elsewhere, but Perimeter Institute’s overview of her lecture includes a helpful characterization of perturbation theory in the context of understanding the proton better: “Phiala Shanahan builds the universe – with a new approach to calculations and the aid of supercomputers, Emmy Noether Visiting Fellow Phiala… Continue reading The proton and perturbation problem
One of the main themes of this blog is “What’s changed in the last 50 years?” — as far as our understanding of physics and the cosmos. For this post, let’s consider the last 100 years or so. There have been major changes in our cosmic perspective. Rather than adding the content of this post… Continue reading Cosmic retrospective — gamma ray bursts
[“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?