Free Republic
Browse · Search
News/Activism
Topics · Post Article

Skip to comments.

Black hole theory suggests light is slowing (down)!
New Scientist ^ | 13:27 08 August 02 | NewScientist.com news service

Posted on 09/23/2002 9:27:50 AM PDT by vannrox

NewScientist.com

 
 

Black hole theory suggests light is slowing

 
13:27 08 August 02

Hazel Muir

 

One of Einstein's most dearly held concepts - that the speed of light is constant - is looking a little fragile. Physicists in Australia claim there is good reason to think the speed of light has slowed over time.

"Einstein would have absolutely hated this," said Paul Davies of Macquarie University in Sydney. "His entire theory of relativity was founded on the notion that the speed of light is an absolute fixed universal number."

The physicists' suggestion follows earlier measurements of a key quantity called the "fine structure constant". This quantity dictates how photons of light interact with particles such as electrons. Observations of the light from distant, superbright galaxies suggest that this "constant" was actually slightly smaller 10 billion years ago (New Scientist print edition, 11 May 2002).

Because the value of the fine structure constant depends on two quantities - the electron's charge (e) and the speed of light (c) - this implies that one of these two quantities has also changed. Either c has decreased over time, or e has increased.


Event horizon

Now Davies and his colleagues say the most likely answer is that c has decreased. They argue that if instead the charge of the electron could go up, then this would mean the event horizon of a black hole - the region from which light and matter cannot escape - would shrink over time. And that would violate one of the golden rules of physics, the second law of thermodynamics.

It is a very speculative suggestion, however, because the detailed physics of black holes are very poorly understood and totally untested. Davies himself admits the arguments are "only suggestive".

But if he is proved right and the speed of light has slowed, it would revolutionise physics. "If these results hold out, we need to start re-examining the very nature of space and time," said Davies.

If the speed of light in the early Universe was much higher than it is now, physicists would have to rethink many of their ideas, such as the theory of inflation, which says space expanded extremely rapidly in the first split second after the big bang.

Journal reference: Nature (vol 418, p 602)

 
13:27 08 August 02
 

Return to news story

  © Copyright Reed Business Information Ltd.

 



TOPICS: Business/Economy; Culture/Society; Extended News; Foreign Affairs; News/Current Events
KEYWORDS: blackhole; death; einstein; engine; experiment; ftl; galaxy; life; light; motor; planet; religion; space; speed; star; sun; travel; truth; universe; variable
Navigation: use the links below to view more comments.
first previous 1-2021-4041-6061-65 last
To: Physicist; RadioAstronomer
Speed-of-light ping.
61 posted on 09/24/2002 8:07:45 AM PDT by Lurking Libertarian
[ Post Reply | Private Reply | To 1 | View Replies]

To: aristeides
doesn't that mean that the speed of light also varies from one place to another?

Among some assumptions on the structure of the universe is that it is the same everywhere. If it turns out otherwise, then our theories will be complicated much more.

62 posted on 09/24/2002 9:21:59 AM PDT by RightWhale
[ Post Reply | Private Reply | To 33 | View Replies]

To: theprogrammer
A simple statement of the second "law" says "it is impossible for an unaided self-acting machine to convey heat from one body to another at higher temperature". Another might be that within a closed system, randomness always increases - things fall apart. Since we also believe that energy can neither be created nor destroyed in a closed system (first law), the only change we admit in a closed system is in the orderliness of the constituents.

It is a proximate empirical observation of a phenomenon. At the quantum level, it is violated all the time. It must be violated at thermal equilibrium as well (unless at absolute 0, which would violate the third law) - so it is a statistical phenomenon seen in bound systems when regarded at a certain scale.

As an observational phenomenon, a system's degree of order or randomness is subjective. A new deck of cards is ordered. After shuffling, it becomes disordered - it is highly unlikely that the deck of cards will ever become ordered as originally after any number of shuffles. But the idea that one arrangement of the cards is peculiar is subjective, all sequences are as likely, we just think that some are unusual.

The second "law" summarizes a practical observation, and gets us to looking for an external energy source when an otherwise closed system seems to increase its order. It is useful when we want to make a reservoir for energy or extract energy from a system. (We can use clumsy methods). But have you seen a formula relating energy to the degree of order in a system? I haven't.

What about self-organizing system? Complex systems seem to form ordered structures all the time, without consuming energy. One might describe these phenomena as eddies in the entropy flow, I suppose, but it is hardly conclusive. Just because we are able to discern organization in a constrained system, I am not convinced that it means that it is energetically different from any other arrangement of its constituents.

63 posted on 09/28/2002 9:11:13 AM PDT by GregoryFul
[ Post Reply | Private Reply | To 57 | View Replies]

To: humblegunner
Light does indeed travel at different speeds.

I see a green light much sooner than the dim-bulb on the cell phone in front of me. However, sound has remained a constant in that my car’s horn can speed the green light signal up such that they can see it. If the horn thing doesn't work then the physical, anti-inertial assault from my bumper to theirs will speed it as well.


Stay safe; stay armed.


PS: I think that the author is full of crap. I cannot see a mechanism that can slow light's speed except for a physical barrier. Black holes can refract light, bend light and even alter its course by 180 degrees, but not slow it down. However, I am almost always wrong!!!

64 posted on 09/28/2002 9:49:11 AM PDT by Eaker
[ Post Reply | Private Reply | To 63 | View Replies]

To: theprogrammer
Are you trying to say that the more scientists believe in something, the more likely it is to be wrong.

The more promising the reason for rethinking a sacred premise in the light of additional experience.

Science is a human pursuit--and its course is more determined by the culture of the society in which it is pursued than by anything else.

In the laws of thermodynamics, we have a foundation for Western science--an entire system that would be invalidated were those laws seen as erroneous.

Entire careers depend on protecting the sanctity of those laws.

So there is reason to believe that those laws may not be challenged often enough or objectively enough.

Fertile ground for the iconoclast.

65 posted on 09/30/2002 9:20:11 AM PDT by Age of Reason
[ Post Reply | Private Reply | To 58 | View Replies]


Navigation: use the links below to view more comments.
first previous 1-2021-4041-6061-65 last

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
News/Activism
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson