[SKRIVA] Mörk energi. holografi och kopieringsmaskiner
- From: Ahrvid Engholm <ahrvid@xxxxxxxxxxx>
- To: <skriva@xxxxxxxxxxxxx>
- Date: Wed, 1 Jun 2011 14:26:04 +0200
Intressant artikel:
http://io9.com/5806752/holographic-dark-information-energy-its-a-real-thing--maybe
"This theory links the dark energy in the universe with the way photocopies
degrade over time. Find out how a loss of information may drive energy
creation.
Many people reading this will have had a run-in with a photocopier at some
point or another in their lives. Often they will have had several run-ins with
photocopiers, and each will have been a little less pleasant. The first copy of
a document looks pretty much like the original. The copy of the copy looks a
little dark in the light areas and a little light in the dark areas, but still
presentable. The next few copies get really rough. Straight lines fray and
dissolve. Clean blank surfaces get hundreds of little specs. Eventually the
whole thing moves from dense information coded in black and white to a uniform
shade of gray that doesn't reveal any information at all.
Some would say this energy was lost. Others would take a look at Landauer's
Principle, and say that this information has been converted into entropy, and
thus evenly-distributed energy. Landauer's Principle draws parallels between
information loss and the laws of thermodynamics. The dissolution of the
concentrated information on a photocopy would be the same as the dissolution of
a drop of warm water dropped into a pool of cold water. Over time, the energy
from the concentrated energy of warm water would spread throughout the cold
water, leading to an even temperature that was slightly higher than it had been
when the warm water was concentrated in a single drop.
The link between the two would not be too impressive, but there is a larger
thing that's moving from dense patches of energy in large colder sections to a
universal tepid temperature - the universe itself. Stars require dense matter
to form, but when they form, they send energy shooting off into the universe.
Eventually they blow themselves apart, dispersing matter throughout the
surrounding area. This is like a photocopy losing its integrity, or a warm drop
of water dispersing its heat throughout a cold pool. Meanwhile, a mysterious
energy is pervading the universe; dark energy. Some, looking at Landauer's
Principle, which equates information with energy, believe that as the
'information' of the matter and dense star-forming clouds in the universe
dissipates, it must release energy. It's this energy that is the source of the
'dark energy' that we see around us.
There is a leap in this logic. Landauer's Principle shows that loss of
information can be modeled on the laws of thermodynamics, not that it actually
is energy dispersed by the laws of thermodynamics. A series of waves set up in
water can show people some of the wave properties of light - but that doesn't
mean that the water itself obeys all the same laws as light. Still, it's a
novel way of looking at the evolution of the universe, an interesting take on
where dark energy comes from, and an awfully cool-sounding phrase."
(Tänkte försöka korta ned artikeln, men det är så mycket detaljer att det är
svårt. Mörk materia, entropi, holografi...det är värt att tänka på när
kopieringsmaskinen krånglar. Den brottas i själva verket med universums
grundläggande struktur!)
--Ahrvid
--
ahrvid@xxxxxxxxxxx / Gå med i SKRIVA - för författande, sf, fantasy, kultur
(skriva-request@xxxxxxxxxxxxx, subj: subscribe) YXSKAFTBUD, GE VÅR WCZONMÖ
IQ-HJÄLP! (DN NoN 00.02.07)
Om Ahrvids novellsamling Mord på månen: http://www.zenzat.se/zzfaktasi.html C
Fuglesang: "stor förnöjelse...jättebra historier i mycket sannolik
framtidsmiljö"!
-----
SKRIVA - sf, fantasy och skräck * Äldsta svenska skrivarlistan
grundad 1997 * Info http://www.skriva.bravewriting.com eller skriva-
request@xxxxxxxxxxxxx för listkommandon (ex subject: subscribe).
Other related posts:
- » [SKRIVA] Mörk energi. holografi och kopieringsmaskiner - Ahrvid Engholm