Author Archives: Sung Lee

Installing gfortran on macOS Sonoma

Posted on February 3, 2024 by Sung Lee

Yesterday, I was helping a physics graduate student install gfortran on his MacBook running on Sonoma. The installation of gfortran is easy. One can use homebrew (I recommend it) to install gfortran. If you don’t have homebrew already installed on … Continue reading →

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Installing Maxima on Old Mac

Posted on January 30, 2024 by Sung Lee

I am still using an old MacBook with OS X 10.10 (Yosemite). I can no longer install Maxima using MacPorts there. Luckily I stumbled upon a Maxima installation instruction at The MaximaList. It worked out nicely and I was able … Continue reading →

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Mythbusting Tachyons

Posted on January 28, 2023 by Sung Lee

There appear to be some misunderstandings concerning superluminal motions or tachyons (here we mean them by generic hypothetical superluminal particles) in physics literature including textbooks. For example, a claim that superluminal motions violate special relativity, that tachyons have an imaginary … Continue reading →

Posted in Special Relativity | Leave a comment

Are Tachyons Really Faster-Than-Light?

Posted on December 17, 2022 by Sung Lee

I will be more than happy to be corrected if I am wrong, but, as far as I am aware, there is no confirmed FTL (Faster-Than-Light) phenomenon. In the past, there were some reported FTL phenomena with the speed of … Continue reading →

Posted in Special Relativity | Leave a comment

The First Image of a Supermassive Black Hole at the Heart of Milky Way Galaxy

Posted on May 16, 2022 by Sung Lee

The first image of a supermassive black hole was obtained back in 2019 by the Event Horizon Telescope (ETH) Collaboration. The supermassive black hole, called M87*, is located at the center of  a distant galaxy Messier 87. It is about … Continue reading →

Posted in Astronomy, Astrophysics, General Relativity | Leave a comment