Register | Sign In


Understanding through Discussion


EvC Forum active members: 64 (9164 total)
3 online now:
Newest Member: ChatGPT
Post Volume: Total: 916,889 Year: 4,146/9,624 Month: 1,017/974 Week: 344/286 Day: 0/65 Hour: 0/0


Thread  Details

Email This Thread
Newer Topic | Older Topic
  
Author Topic:   How do creationists explain stars?
johnfolton 
Suspended Member (Idle past 5619 days)
Posts: 2024
Joined: 12-04-2005


Message 218 of 297 (328397)
07-03-2006 2:36 AM
Reply to: Message 214 by nwr
07-02-2006 12:12 PM


Re: Q&A
Is the Bell phenomenom an example of faster than light communication? If the photon travels at the speed of light then is quantum entanglement communication happening at faster than light? If not why?
They make a barrier to photons (called a wave quide) yet information is recieved through the barrier. Has photons actually crossed over the barrier or is this another example suggestive of quantum entanglement (ftl) communication? Like the Bell slits allowing only a photon to pass through yet by all appearances suggestive of photons communicating with photons on the other side though faster than light communication.
*** response source
This subtle but crucial distinction makes all the difference between a faster-than-light or "FTL" transmitter--what author Ursula K. LeGuin called an "ansible"--and a laboratory curiosity. Still, this experiment--a real shocker in its day, and still cutting-edge these 40 years later--proved for the first time that quantum entanglement was a physical phenomenon with bona fide FTL implications.
The same trick works for photons; with a device called a waveguide, it's rather easy to create barriers across which microwave photons are incapable of traveling. But some small fraction of the photons can tunnel across it, appearing suddenly on the other side as if by magic.
voidspace.org.uk
Edited by johnfolton, : No reason given.

This message is a reply to:
 Message 214 by nwr, posted 07-02-2006 12:12 PM nwr has not replied

Replies to this message:
 Message 219 by cavediver, posted 07-03-2006 3:26 AM johnfolton has not replied
 Message 220 by Percy, posted 07-03-2006 7:29 AM johnfolton has not replied

johnfolton 
Suspended Member (Idle past 5619 days)
Posts: 2024
Joined: 12-04-2005


Message 225 of 297 (328869)
07-05-2006 2:09 AM
Reply to: Message 214 by nwr
07-02-2006 12:12 PM


Re: Q&A
If the pulse width increased 1 fiftieth yet the returning edge was slower, why can it not be interpreted as light increasing 300 times its speed. All they seem to be saying is that within group velocities its speed increased due to the width of the leading pulse then they say its not increasing its speed beyond light speed.
How are they measuring the pulse returning in respect to speed? It just seems to me that light pulse speed has increased due to the returning pulse speed and that its is just a matter of interpretation?
Like in the group velocities if light is slowing upon its return then the starlight entering our solar system could be slowing dramatically as it runs into resistance of the solar winds of the sun energies rushing outward. We might actually be seeing a young not old universe based on just the width of the light waves increasing not decreasing in space.
Meaning: Upon leaving our solar system "if" our suns pulse width increases 80% then 40 times 300 = 12,000 times the speed of light. Just based off interpretations based off the pulse width increase of 1 fifteeth increased 80%. If the photons are not actually particles but a part of the wavefunction would they too be able to unwind once outside the solar system?
****resource article:
The faster-than-light propagation occurs because the pump beams preferentially amplify the leading edge of the incident pulse, lending power to the signal and being repaid by absorbing some of the energy in its trailing edge. (It is important to note that even the dramatic 60 ns advance is only one fiftieth of the width of the pulse.) This is exactly analogous to the intuitive explanation of normal dispersion, except that in this case the atoms temporarily amplify the light pulse rather than absorb it.
What is shocking is that such an effect has been observed for the first time without a great deal of attenuation, amplification or distortion of the pulse. It appears as though energy has, in fact, travelled faster than light.
Home – Physics World
Edited by johnfolton, : No reason given.

This message is a reply to:
 Message 214 by nwr, posted 07-02-2006 12:12 PM nwr has replied

Replies to this message:
 Message 226 by nwr, posted 07-05-2006 2:24 AM johnfolton has not replied
 Message 227 by Percy, posted 07-05-2006 8:17 AM johnfolton has replied

johnfolton 
Suspended Member (Idle past 5619 days)
Posts: 2024
Joined: 12-04-2005


Message 237 of 297 (329331)
07-06-2006 11:46 AM
Reply to: Message 227 by Percy
07-05-2006 8:17 AM


Re: Q&A
I was unable to view nwr links, appears I needed at least upgrade to xp to view. However looking at your garage too me it appears the transmitted pulse of light has left the garage however is the returning incident pulse that is returning to the garage at 300 times reduced speed.
It appears that the light has left the garage but when the returning part of the light wave starts returning its returning in the unamplified state (300 times less speed or 1 fifteeth of the amplified waves) that were initially transmitting outward.
Has light left the garage but then runs into resistance then after 60 *ns* loses its amplification and only then is the incident pulse able to return to the garage.
"If so" then starlight pulse width could be unwinding as it leaves our solar system (solar garage) less to compress the light wave outside the solar garage thus increasing lights speed. However recompressing once it re-enters our solar system (solar garage).
If lights waves are compressed (resistance to light within the solar garages) then light waves should naturally uncompress once star light leaves the solar garages).
Group velocities temporarily seem to be increasing the pulse wave width by force which makes it appear to be leaving the garage before its reaches the garage. Yet in space ***is**** the lack of solar resistance allowing light waves to elongate (increasing lights speed) without a loss in information when it recompresses (expressed as starlight) upon re-entering our solar system?
***article two pulses (the pulse leaving the garage and the secondary pulse returning.)
The meaning of a negative group velocity is illustrated in figure 2. Within the cell, the peak of the pulse travels backwards relative to the direction it is moving in outside the cell. Long before the incident light pulse reaches the cell, two peaks appear at the far end: one travelling away from the cell at c, the other travelling back towards the entrance. This second pulse travels 300 times more slowly and is timed to meet up with the incident peak. The transmitted pulse travelling at c appears to leave the cell some 60 ns before the incident pulse arrives, enough time for it to travel an additional 20 metres.
Home – Physics World
Edited by johnfolton, : No reason given.
Edited by johnfolton, : To add a question?

This message is a reply to:
 Message 227 by Percy, posted 07-05-2006 8:17 AM Percy has replied

Replies to this message:
 Message 239 by Percy, posted 07-11-2006 3:14 AM johnfolton has not replied

Newer Topic | Older Topic
Jump to:


Copyright 2001-2023 by EvC Forum, All Rights Reserved

™ Version 4.2
Innovative software from Qwixotic © 2024