In the last few months, I’ve been struck by how many articles have been published in the popular media and science news about black holes and the Big Bang. Mainstream physics and science communications (like phys.org, quantamagazine.org, etc) lately seem to be discussing more and more “mind blowing” geometries of the universe (or multiverse, eh).… Continue reading Cosmological fact and fiction
I’ve thought about this question for years. A FAQ. Imagine you’re traveling at the speed of light. Well, physics says that’s impossible. Mass’ gotcha. So, what can travel at the speed of light? Photons (not just the visible ones). So, imagine … does a photon “experience” space and time? Some weeks ago I recall reading… Continue reading A photon’s frame of spacetime — no rest for the massless
Reference: The 2018-2019 Watson Lecture Series, Caltech, Beckman Auditorium World’s Deepest-Penetration and Fastest Optical Cameras by Lihong Wang Wednesday, November 28, 2018, 8:00 PM – 9:30 PM Lihong Wang will discuss the development of photoacoustic tomography, which allows scientists to peer deep into biological tissue. He will also talk about his lab’s development of compressed ultrafast… Continue reading Imaging a light pulse?
Today’s post is somewhat different than usual. I’m highlighting a YouTube channel. Communicating science to a general audience has a long history. The bibliography for my physics blog contains some books by authors to this purpose. Modern physics has many great stories, and the just plain strangeness of quantum physics lends itself to great storytelling.… Continue reading Communicating what physics says — Domain of Science YouTube channel
As I’ve written elsewhere, I sometimes think that generations of scientists raised in space might help advance physics, having lived in a world dominated by inertia (rather than friction). Especially in regard to a visceral understanding of microgravity. Like characters in the TV series The Expanse. So, this Space.com article (June 18, 2018) “Relativity: The… Continue reading Acceleration causes gravity, gravity causes acceleration
I’ve been following this topic for years. Just some notes before I post something more complete — prompted by Stephen Hawking’s final research paper, much in the news. Multiverse: infinite or countable verses? • Prof Stephen Hawking’s multiverse finale (May 2, 2018), BBC News, includes a video. The study was submitted to the Journal of High-Energy… Continue reading Multiverse paradox — potpourri of universes
As I continue to ponder the mind boggling character of quantum physics (the 10^-n reality), I’m fascinated by articles about novel experiments which routinely explore infinitesimal time scales and distances. Nanoscale (10^-9) is amazing! But now there’s the attosecond. This Space.com article (April 30, 2018), “The ‘Attoclock’ Shows How Fast Electrons Move in a Millionth of a Billionth… Continue reading What’s an attosecond?
While it is strange (and disturbing) that some religious conservatives dispute the scientific consensus on the age of the Earth and the universe, another Space.com article this past week (3-10-2018) — Yep, the Earth Is Still Round, Neil deGrasse Tyson Says — reminded me that there’s an even stranger group, namely, those who still play… Continue reading The Earth is round — needless to say?
Following up on the “Ultimate how” question in the context of the Big Bang theory, how far back in time can we actually detect evidence, follow a breadcrumbs trail? To a cosmic dawn? Space.com, among others, today posted articles about research at the Murchison Radio-Astronomy Observatory (MRO), in particular the MRO’s Experiment to Detect the Global EoR… Continue reading Star bright, first light — fingerprint hunt
Perhaps the ultimate why question: Why is there something rather than nothing? Sean Carroll’s blog is a feed on my blog. I enjoyed reading his recent post and paper on this question. Quite a challenge to summarize the topic in 15 pages. I’ve talked before about the issue of why the universe exists at all… Continue reading Ultimate why?