[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?
Wiki: World Science Festival Space.com: “Science As a Full Body Experience: Brian Greene On 2019 World Science Festival — The festival runs from May 22 to June 2 in New York City” by Doris Elin Salazar (May 22, 2019). Greene: Yeah, it is a really quite broad audience. The goal is to make the programs… Continue reading World Science Festival 2019
[See comments for updates.] Today Wired.com (among others) published an article “Are Humans Fit for Space? A ‘Herculean’ Study Says Maybe Not” which summarizes NASA’s Twins Study which was published in Science (The NASA Twins Study: A multidimensional analysis of a year-long human spaceflight). Wired: In space, fluids won’t drain, and astronauts develop red, puffy… Continue reading Humans fit for space? — NASA’s Twins Study
As teased earlier this month, today the Event Horizon Telescope (EHT) project announced and presented the first ever photographs of a black hole — “the last photon orbit.” Another epic story of big science and an international team. The interplay of models and simulations, data capture, and complex processing. And funding. Much news coverage. Here’s… Continue reading Photographing a black hole?
[Topic placeholder] I’ve been following articles for awhile about micron, nanometer, and atomic level confinement and manipulation. The development of “optical tweezers” facilitated exploration of biological particles with sizes in the micrometer and nanometer range such as viruses and bacteria and subcellular components. Optical traps also facilitated exploring properties of trapped individual molecules and atoms.… Continue reading Atomic tweezers — levitated optomechanics
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
Regarding recent posts about black holes, here’s another YouTube video by The Science Asylum on the topic (published February 16, 2019): “Black Holes can SPIN?!?” I’ve previously highlighted The Science Asylum as a science communicator. This latest video is an interesting overview of black holes: non-spinning vs. spinning, the math vs. reality inside and outside… Continue reading Ergosphere – what?