Monday, October 15, 2007

Inconstant Constants


Hello again! Things have been busy, but this scientist hopes to blog more often. Check out my guest post at Quantum Diaries Survivor. The output of science is definitely not constant.

Another interesting item is in the October 13 issue of NEW SCIENTIST, Supernova Shift May Distort Dark Energy Readings.

"EFFORTS to discover the nature of the mysterious force known as dark energy have been thrown into disarray by the discovery that supernovae are not as predictable as had been assumed.

"Because the average brightness of the stellar explosions known as type Ia supernovae was thought to stay the same over the universe's history, astronomers have treated them as "standard candles". In other words, they have used their apparent brightness as seen from Earth as a yardstick for measuring how far away they are, and from this they have estimated the rate of expansion of the universe.

"Now an investigation of supernovae by Andrew Howell of the University of Toronto, Canada, and colleagues has thrown the basis for such measurements into doubt."

Howell's research shows that the average Type Ia supernova was 12% brighter billions of years ago. Even if DE exists, a "Dark Energy Mission" would not return a single particle or even a track in a bubble chamber to prove it exists. All we would have is an "equation of state" that physicists could puzzle over and write papers about. The equation of state could be explained by changing parameters, like the speed of light. The high precision required for an equation of state requires that supernovae be constant. The Howell paper is in Astrophysical Journal v. 667, p. 37 Do taxpayers really want to spend 1 billion+ US for this?

As someone writes in Quantum Diaries:

"Inferences of cosmic acceleration depend on many other values being constant, including luminosity of supernovae. Many values have changed in the billions of years since distant stars exploded. The metal content of ancient stars is known to have been much less than today. Since we cannot time-travel into the past, it is difficult to determine if fundamental values are constant."

Many quantities that were once thought constant have been found to change. Even the output of science is not constant--it proceeds in fits and starts. Advances are slowed by dogma and accelerated by revolution. We may find that the only constant is change. It is best to give science its opportunity to advance.

This week Space for Commerce hosts the Carnival of Space!

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6 Comments:

Blogger alex kaplan said...

Congragulations to L.Riofrio -researcher and scientist

9:59 AM  
Blogger Kea said...

Good to hear progress is being made!

10:54 AM  
Blogger L. Riofrio said...

Thanks to both of you for continued support.

11:41 AM  
Blogger alex kaplan said...

To those who don't know,it is my car

8:57 PM  
Blogger ferncal73 said...

Dear Louise;
Hi! My name is Fernando Calera, Jr. I just want to say that i got you're blog from the recent newsletter from The San Francisco Republican Party, and thought that i send a message to you to say hello! I coulden't help reading all those things about you you sound like a very interesting person, another reason why i'm writing to you is because i too, am a Republican, & i think it's quite refereshing to know that someone has attractive & innovative is a Republican but also, i also would like to get to know you as a friend, or, as a person as well. One of my hobbies is writing to celebrities & reading that you are a celebrity i also wanted to know if you could send me a personallu autographed picture as well.
Take Care;
Fernando Calera Jr

10:10 AM  
Anonymous buy viagra said...

I will give so much credit to the person to really convince me of the existence of dark energy, I don't really buy any theory at the moment, but I would love to be convinced one day.

6:01 AM  

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