Showing posts with label Large Hadron Collider. Show all posts
Showing posts with label Large Hadron Collider. Show all posts

Wednesday, February 28, 2018

Looking for (the) God (Particle) in all the Wrong Places


I have talked with many skeptics who claim that they do not believe in God because he has not conclusively demonstrated his existence to them. When asked how God might demonstrate his existence to their satisfaction I usually get an answer that consists of some criteria in which God would do something so spectacular that his intervention could not be denied. A classic example is that if God would miraculously regrow the limb of an amputee then the skeptic would believe in God. I addressed this issue to some extent in my post titled "Extraordinary Claims and Extraordinary Evidence." I personally don't think that even such an extraordinary event would convince most skeptics of the existence of God. Would they actually have to see the limb as it grows back? Would they accept that the limb had grown back miraculously if a number of people including the person's doctor claimed that the limb was gone and now it is back?

Suppose I was to propose an experiment to test for God in which 1000 people prayed that a miracle would occur. Would that be a valid test for the existence of God? Actually, from a scientific perspective that could not, even in principle, be a valid test regardless of the results, either positive or negative, and could not be scientifically accepted. In any test involving a person with volition and the ability to make choices, the test is considered biased and invalid if the person knows she is being observed and can change her behavior to influence the test. In any test of God, he would know he is being tested and could change his behavior to influence the test. Consequently, regardless of the outcome of the test, it would be considered scientifically invalid.

Monday, February 19, 2018

Probing the God Particle


Almost six years ago headlines throughout the world declared the discovery of the "God Particle" at CERN's Large Hadron Collider (LHC). The name "God Particle" is not used by any physicists but is the popular name in the press for the particle that physicists call the Higgs Boson or simply the Higgs, named after Peter Higgs, one of the theoretical physicists that proposed its existence in 1964. In an earlier post, I discussed the discovery of the Higgs Boson and its significance within the standard model of particles and fields. Although the discovery of the Higgs made international news, there has been a lot of hard work that has been done since that discovery was made. In experimental particle physics the discovery of something new is often the easiest part of the process and the hard part is trying to really understand what has been discovered. Much of my research life since 2012 has been dominated by further studies of the properties of the Higgs Boson.

Why do physicists spend so much time and effort studying something that has already been discovered? What is the motivation and the expected outcome? There is a complex and comprehensive mathematical model of nature that particle physicists use. This model makes detailed predictions about what we should expect to find in our experiments. One of the most exciting possibilities is to discover something in the data that does not fit the models. When that happens, and the discovery can be confirmed and verified, it means that we have found something new that we did not know before. That is the most thrilling outcome for an experimental physicist. It is always nice to confirm something that has already been predicted. But it is even more exciting to find something not predicted and then have to figure out what previously unknown secret of nature has been discovered.

Saturday, January 13, 2018

The Reports of the Death of String Theory may be Greatly Exaggerated

In a recent podcast, Dr. William Lane Craig discusses my blog post about the book The Grand Design by Stephen Hawking and Leonard Mlodinow. In his remarks, Dr. Craig says that he is surprised by Hawking's reference to String Theory because String Theory seems to have some fatal flaws. I have heard from others that String Theory has not lived up to the promise it seemed to show about 10 or 20 years ago. In this post, I will describe what String Theory is, why some people think it may be in trouble, and some theological implications of String Theory.

String Theory is a theoretical idea in physics that proposes that the most fundamental objects in the universe are one-dimensional objects called strings. In String Theory, the fundamental particles that we currently know make up the structure of the universe including leptons, quarks, and bosons, are composed of one-dimensional objects that are described as vibrating strings. Just as different vibrational modes of a guitar string will give different musical tones, so the different vibrating modes of the strings give rise to different particles.

Friday, February 17, 2017

The World at CERN



And now for something completely different...  The main focus of this blog is to discuss issues relating science and reason to Christianity and God.  However, I have spent the last week at CERN attending meetings, talking with people, trying to develop computer code to analyze data, and other such activities.  So I'm going to take this opportunity to talk about how experimental particle physics research is done within large collaborations like those at CERN.

I am a member of the ATLAS collaboration.  ATLAS is the name given to both the detector that we use to analyze data from proton-proton collisions at the Large Hadron Collider and the group of scientists who use the data from that detector to try to understand the fundamental particles and forces in the universe.  There are currently about 5000 scientists from about 180 institutions in 38 countries who are members of the ATLAS collaboration, with 1200 of those scientists being students working toward their Ph.D.  It takes that many people to operate the ATLAS detector and to analyze all of the data that we take with the detector.