Re: [escepticos] Luz cansada

[David de Cos <ddecos@...>]

Hola,

Hubert Abasto decía:

> Hola
>
> Un artículo publicado por EFE habla de que el momento del Big-bang la luz
> se movia con velocidad infinita y con el tiempo se ha cansado y ahora
> tiene su velocidad actual, se supone que la investigación es australiana
> y será publicada hoy en Science, me parece absurdo y me pregunto si la
> luz a velocidad infinita significa que la luz del big-bang esta en todas
> partes en todo momento o no esta en ninguna parte y por tanto no
> existe???? bueno les mando una parte del artículo porque no lo encontré
> completo.
>
> AUSTRALIA-CIENCIA Científicos australianos afirman que la luz ha perdido
> velocidad
> Sydney (Australia), 8 ago (EFE).- La luz ha perdido velocidad con los
> años, según un estudio de un grupo de científicos australianos de la
> Universidad Macquarie de Sydney, que desafían con esta conclusión teorías
> científicas como la de la relatividad de Einstein.


Aquí va el artículo completo, cogido de www.cnn.com. Como es habitual, 
tratar de encontrar algo de coherencia en una noticia científica dirigida 
al "gran público" es absolutamente imposible, así que no hay quien entienda 
nada. Atención especial a la "descripción" del experimento, si se le puede 
llamar así.

Si no fuese porque parece que lo van a publicar en Nature...


-----------------------------------------------

Einstein's theory may be relatively wrong
August  8, 2002 Posted:  4:43 AM EDT (0843 GMT)

SYDNEY, Australia -- The crux of Einstein's theory of relativity  -- that E 
= mc 2 -- is under challenge, following evidence that the speed of light 
might be slowing down.
The discovery, made by a team of Australian scientists, undermines 
Einstein's key formula which maintains that the speed of light must remain 
constant.
The speed of light is measured as roughly 300,000 kilometers (186,300 
miles) a second.
The team's findings, which are published in the latest edition of respected 
science journal Nature, are causing a major stir in the lofty circles of 
theoretical physics.
Team leader Paul Davies, of Sydney's Macquarie University, says that if the 
speed of light has slowed over billions of years, physicists will have to 
rethink many of their basic ideas about the laws of the universe.
"That means giving up the theory of relativity and E = mc2 and all that 
sort of stuff," Davies told Reuters news agency on Thursday.
"But of course it doesn't mean we just throw the books in the bin, because 
it's in the nature of scientific revolution that the old theories become 
incorporated in the new ones."
What Davies and his team did was study a 12 billion-year-old stream of 
light.

Cornerstone

They discovered it did not have the properties it was expected to, and by a 
process of elimination deduced that the speed of light must have been much 
faster billions of years ago.
"It's entirely possible that the speed of light would have got greater and 
greater as you go back," he told the Herald Sun newspaper.
"If the speed of light were nearly infinite in the first split second [of 
the universe's creation] it would explain why the universe is so uniform."
The implications of the discovery -- if it is proven correct  -- are not 
necessarily clear.
"When one of the cornerstones of physics collapses, it's not obvious what 
you hang onto and what you discard," Davies told Reuters.
"If what we're seeing is the beginnings of a paradigm shift in physics like 
what happened 100 years ago with the theory of relativity and quantum 
theory, it is very hard to know what sort of reasoning to bring to bear."

'All bets off'

"For example there's a cherished law that says nothing can go faster than 
light and that follows from the theory of relativity," Davies said.
"Maybe it's possible to get around that restriction, in which case it would 
enthrall Star Trek fans because at the moment even at the speed of light it 
would take 100,000 years to cross the galaxy.
"It's a bit of a bore really and if the speed of light limit could go, then 
who knows? All bets are off."
Davies is a Professor of Natural Philosophy at the Australian Center for 
Astrobiology at Macquarie University.
Last week he received the British Royal Society's Michael Faraday Award for 
his efforts in furthering the public communication of science, engineering 
or technology in the United Kingdom.
Davies has a worldwide reputation as an enthusiastic and skilled 
communicator of contemporary physics issues.

------------------------------------

A ver si encuentro algo de información verdadera sobre el tema, porque 
realmente han conseguido intrigarme.

Un saludo,

David de Cos