Ed Friedman
@dred2.bsky.social
Lectures on physics and cosmology for senior citizens. Writing a book on foundations of quantum mechanics for same. Aerospace optics. Climate science. Author of Photonics Rules of Thumb. Has a Jewish space laser patent. Piano student. Cruise ship lecturer.
Does today's SC ruling limiting judges' power undo the Mifepristone decision by Kacsmaryk?
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June 28, 2025 at 1:19 AM
Does today's SC ruling limiting judges' power undo the Mifepristone decision by Kacsmaryk?
The proper pronunciation of DOGE is "doggie". You know, like some people do.
March 5, 2025 at 2:26 PM
The proper pronunciation of DOGE is "doggie". You know, like some people do.
The glass is empty but has an ullage of 50%.
December 9, 2024 at 1:12 AM
The glass is empty but has an ullage of 50%.
I didn’t like them when they were at their peak but now that I’m studying piano I see the musical sophistication.
December 2, 2024 at 12:27 AM
I didn’t like them when they were at their peak but now that I’m studying piano I see the musical sophistication.
Me in the NY Times, 2000, opining on the cost of space missions.
November 27, 2024 at 6:21 PM
Me in the NY Times, 2000, opining on the cost of space missions.
Me with Neil Tyson at the AAS meeting where the first Kepler results were announced.
November 27, 2024 at 5:56 PM
Me with Neil Tyson at the AAS meeting where the first Kepler results were announced.
Me with Jerry Stiller 2015 at the Viand Cafe Upper West Side of NY. Jerry was nice enough to chat with us after I thanked him for contributing to the Jazz Bakery in LA in the name of Bill Evans. He explained that he and Ann Meara used to open for Evans and knew him well.
November 27, 2024 at 5:55 PM
Me with Jerry Stiller 2015 at the Viand Cafe Upper West Side of NY. Jerry was nice enough to chat with us after I thanked him for contributing to the Jazz Bakery in LA in the name of Bill Evans. He explained that he and Ann Meara used to open for Evans and knew him well.
45 years ago, my colleagues and I warned that conflict between the developed and developing nations would erupt because of climate inequity.
www.theguardian.com/environment/...
Sadly, we were right and now the bill must be paid.
www.theguardian.com/environment/...
Sadly, we were right and now the bill must be paid.
Row over who will pay $1tn climate fund drags Cop29 talks past the deadline
Rich countries resist increasing their contributions to poor countries that are bearing the brunt of global heating
www.theguardian.com
November 24, 2024 at 5:31 PM
45 years ago, my colleagues and I warned that conflict between the developed and developing nations would erupt because of climate inequity.
www.theguardian.com/environment/...
Sadly, we were right and now the bill must be paid.
www.theguardian.com/environment/...
Sadly, we were right and now the bill must be paid.
One of my recent drawings
November 21, 2024 at 4:37 PM
One of my recent drawings
A great day in Harlem
November 21, 2024 at 4:54 AM
A great day in Harlem
Eagle shots. Broomfield, CO, USA 2012
November 18, 2024 at 11:24 PM
Eagle shots. Broomfield, CO, USA 2012
Concordance of a variety of measurements confines the values of the density of matter and dark energy to 0.3 and 0.7 respectively.
November 18, 2024 at 11:19 PM
Concordance of a variety of measurements confines the values of the density of matter and dark energy to 0.3 and 0.7 respectively.
New to jazz theory? Here's a rule for dealing with tritone substitutions. For the common ii (minor), V (dominant), I (major) sequence, move downward chromatically from the ii (for example F minor) to the tritone (E dom) to the major (Eb maj) instead of the typical F minor, Bb dominant, Eb major.
November 18, 2024 at 10:50 PM
New to jazz theory? Here's a rule for dealing with tritone substitutions. For the common ii (minor), V (dominant), I (major) sequence, move downward chromatically from the ii (for example F minor) to the tritone (E dom) to the major (Eb maj) instead of the typical F minor, Bb dominant, Eb major.
The Casimir effect reveals the properties of vacuum energy. Predicted in the late 1940s, it was confirmed in 2001. Here is an introduction to the mathematics of the effect. You get almost the right answer using dimensional analysis.
docs.google.com/presentation...
docs.google.com/presentation...
The Riemann Zeta function and applications
In this seminar we will study the Casimir Effect by exploiting the Riemann Zeta function, the gamma function, dimensional analysis, divergent series and the calculus of residues Oct 2018, Nov 2020, Ap...
docs.google.com
November 18, 2024 at 10:48 PM
The Casimir effect reveals the properties of vacuum energy. Predicted in the late 1940s, it was confirmed in 2001. Here is an introduction to the mathematics of the effect. You get almost the right answer using dimensional analysis.
docs.google.com/presentation...
docs.google.com/presentation...
This is the figure I use to show that the Friedmann equation using measured values for the density of dark energy and total matter matches with measured rates of expansion of the universe. The dark green line results from a dark energy density of 0.7 and a total matter density of 0.3.
November 18, 2024 at 10:28 PM
This is the figure I use to show that the Friedmann equation using measured values for the density of dark energy and total matter matches with measured rates of expansion of the universe. The dark green line results from a dark energy density of 0.7 and a total matter density of 0.3.
Here's a paper on climate change from 1980. The NCAR climate group was active in public outreach, but not enough, I guess.
drive.google.com/file/d/1d--9...
drive.google.com/file/d/1d--9...
November 16, 2024 at 5:02 PM
Here's a paper on climate change from 1980. The NCAR climate group was active in public outreach, but not enough, I guess.
drive.google.com/file/d/1d--9...
drive.google.com/file/d/1d--9...
Who took that photo?
November 16, 2024 at 6:28 AM
Who took that photo?
I was at NCAR in 1980 with Will Kellogg, Schneider, etc. We wrote papers, and Kellogg testified before Congress, Schneider published a book and was on with Johnny Carson. Nothing changed.
People get elected by ignoring inconvenient distant threats. We will always stumble from crisis to crisis.
People get elected by ignoring inconvenient distant threats. We will always stumble from crisis to crisis.
November 15, 2024 at 3:10 PM
I was at NCAR in 1980 with Will Kellogg, Schneider, etc. We wrote papers, and Kellogg testified before Congress, Schneider published a book and was on with Johnny Carson. Nothing changed.
People get elected by ignoring inconvenient distant threats. We will always stumble from crisis to crisis.
People get elected by ignoring inconvenient distant threats. We will always stumble from crisis to crisis.
My book on foundations of quantum mechanics is now available. drive.google.com/drive/folder...
Lectures on this topic are available on my YouTube channel
www.youtube.com/playlist?lis...
Lectures on cosmology are here drive.google.com/drive/folder...
Lectures on this topic are available on my YouTube channel
www.youtube.com/playlist?lis...
Lectures on cosmology are here drive.google.com/drive/folder...
CSU Class on Quantum Foundations Fall 2024 - YouTube
This set of videos was created while I taught a class on the foundations of quantum mechanics in the fall of 2024. The audience was adult learners who signed...
www.youtube.com
November 8, 2024 at 5:08 PM
My book on foundations of quantum mechanics is now available. drive.google.com/drive/folder...
Lectures on this topic are available on my YouTube channel
www.youtube.com/playlist?lis...
Lectures on cosmology are here drive.google.com/drive/folder...
Lectures on this topic are available on my YouTube channel
www.youtube.com/playlist?lis...
Lectures on cosmology are here drive.google.com/drive/folder...
I'll be teaching classes on cosmology and quantum foundations through Colorado State University starting in January. Watch for the CSU Osher catalog for details. Zero math. Zoom based lectures. Designed for adult learners. A free book comes with the quantum class.
November 8, 2024 at 3:47 PM
I'll be teaching classes on cosmology and quantum foundations through Colorado State University starting in January. Watch for the CSU Osher catalog for details. Zero math. Zoom based lectures. Designed for adult learners. A free book comes with the quantum class.