President Obama has initiated a new program to map the human brain. He has initially allocated $100 million for it but that will clearly not be enough for such a mammoth project and will have to be considered a down payment that must be added to later. I think that this is a worthy project, since the brain defines so much of who were are. [Read more…]
Last Friday, I participated on the panel that discussed Science and Religion. The room was full (I estimate well over 100 people) showing how much interest there was in this topic amongst students, staff and faculty. It lasted about 75 minutes but many people stayed on afterwards to discuss in small groups. I spent about 90 minutes afterwards talking with some people and it was a lot of fun. What follows is a summary of the discussion and Q/A that focuses mostly on the topics that interested me. [Read more…]
In order to understand the Higgs mechanism, we need to first understand how it came to be that the Higgs field, unlike all the other fields corresponding to the other 18 elementary particles, came to have a non-zero average value in the vacuum. As I said in the previous post in this series, this is the key fact about the Higgs field that leads to it giving mass to the other particles. So how did that come about? [Read more…]
I have said before that the emerging modern consensus is that there are no particles or waves in the classical sense of those terms, although those concepts are still useful to us in visualizing physical processes. (For previous posts in this series, click on the Higgs folder just below the blog post title.) [Read more…]
Although I will not be talking about the graviton much in this series, it is worthwhile to make a slight detour from the main story line to discuss the role of the gravity force. (For previous posts in this series, click on the Higgs folder just below the blog post title.)
I should point out that unlike with the other force fields, we have not as yet been able to find a way to ‘quantize’ the gravitational field, i.e., find a way to make its particle properties manifest, the way we have been able to do with the theories of the strong, electromagnetic, and weak forces. But despite this, we have been able to make great progress in understanding it. As this article points out, because we have the option of visualizing the behavior of fields using either a particle model or a wave model, we can choose which is the most convenient in any given context, and that has enabled us to overcome the lack of a quantized theory of gravity. [Read more…]
This Friday, April 5, I will be on a panel to discuss Science and Religion. It will take place from 12:30-2:00 pm in Nord 310 on the Case quad of the CWRU campus. The program is sponsored by the President’s Interfaith and Community Service Campus Challenge. Lunch will be provided. If you are in the vicinity, feel free to drop by. [Read more…]
Yvonne Brill died recently. She was a highly respected rocket scientist who received the National Medal of Technology and Innovation in 2011 from president Obama and was noteworthy enough to merit an obituary in the New York Times. Also noteworthy was the fact that the obituary also focused on her sterling qualities as a mother, wife, and cook, as if her ability to combine the mundane duties of everyday life with her scientific work was her main achievement. [Read more…]
Perhaps it would be good at this point to take a breath and summarize up the state of play so far. (For previous posts in this series, click on the Higgs folder just below the blog post title.)
In quantum mechanics we have the unifying idea that everything in the universe is made up of relativistic quantum fields that correspond to elementary particles and which I will refer to in the future as simply fields. These fields are wavy-like vibrations and differ from classical waves in that they are not vibrations of a medium (like water for ocean waves or air for sound waves) but vibrations of space itself, if you can imagine it. The word quantum in its name comes from the fact that the energy of vibrations of these fields can only change by small discrete amounts (or ‘quanta’) and not continuously, the way that classical vibrating fields can. [Read more…]
In the previous post in this series, I introduced the idea of fields and also said that while the Schrodinger equation and wave function overcame some of the problems with understanding how particles could also have wave properties, there were still difficulties in both interpretation and practice. The person who made the next major advance and created the framework for our present understanding of all matter was Paul Dirac (1902-1984) whose views on religion I wrote about over the weekend. [Read more…]
In the previous post in this series, I said that wave mechanics as represented by the Schrodinger equation was a major advance in our understanding of physics. It adopted the view that all entities had both particle-like and wave-like properties and each of them were manifested by constructing the appropriate experimental set-up. If you set up an experiment that looked for the wave characteristics of (say) an electron, you detected its wave properties. If you set up an experiment that looked for the particle characteristics, you saw that too. [Read more…]