Similarities
17 Apr 2006 22:29:44 UTC
Topic 191097
(moderation:
Are their any similarities between the way strings
in (string theory) are tied down to our universe
membrane and the white magnetic field lines (or sunspots) connected to the suns magnetic carpet?
http://www.mpa-garching.mpg.de/mpa/research/current_research/hl2005-12/hl2005-12-en.html#top
Ernie
Team Art Bell
God Bless
Similarities
)
Are their any similarities between the way strings
in (string theory) are tied down to our universe
membrane and the white magnetic field lines (or sunspots) connected to the suns magnetic carpet?
http://www.mpa-garching.mpg.de/mpa/research/current_research/hl2005-12/hl2005-12-en.html#top
Fellow crunchers, can you assist me with this question?
I remember something Brian Green said in
Chapter 3 "Signs of strings" on the "The Elegant Universe" that influenced this question.
Strings are thought to be so tiny, much smaller than an atom, that there's probably no way to see them directly. But even if we never see strings, we may someday see their fingerprints. You see, if strings were around at the beginning of the universe, when things were really tiny, they would have left impressions or traces on their surroundings. And then, after the big bang, when everything expanded, those traces would have been stretched out along with everything else. So, if that's true, we may someday see the tell-tale signs of strings somewhere in the stars.
What did he mean by "they would have left impressions or traces on thier surroundings" & "Tell-tale signs of strings somewhere in the stars"
Thanks for your help crunchers
Ernie S
Team Art Bell
God Bless
RE: What did he mean by
)
It is possible the strings caused variations density/temperature of early universe. The magnitude and size of the variations depend on details of the theory. The variations might be visible in the Cosmic Microwave Background but the interpretation of the data is complicated by things such as inflation and the cosmological constant etc.
new look at
)
new look at sunspots
Simple answer, no.
Magnetic field lines are always closed loops. In string theory it is the open strings (ie strings with ends) that have their ends embedded. The closed loop strings are free to move through out all the spatial dimensions as are the string portion of open strings.
RE: new look at
)
Thanks Mark
Ernie
RE: RE: new look at
)
"In string theory it is the open strings (ie strings with ends) that have their ends embedded"
Mark, is thier any literature or diagrams on this anywhere?
Thanks
Ernie S
Ernie, there are some basic
)
Ernie, there are some basic "worldsheets" here, and you can click on the 'Contents' link at the bottom of that page to access more background info... (Note: the home page was last modified in 2003, so you might find newer sites by googling some of the terms like 'branes', etc.)
RE: Ernie, there are some
)
ChipperQ,
Thanks for helping out a curious rookie.
Ernie
Team Art Bell
God Bless
Ernie: The 'Elegant Universe'
)
Ernie:
The 'Elegant Universe' makes reference to the idea of the ends of open strings being embedded/defining a brane. I have not found anything that is clearer (pity that). If you visualize the graphics from ChopperQ's link as flat rather than circular you will get an idea of what is meant by open strings. It is of interest to note that the end points of the open strings are traveling at the speed of light.
An alternative would be to poke holes in the surfaces portrayed in the graphics.
RE: Ernie: The 'Elegant
)
I am honored, thank you both.
Ernie
RE: Mark, is thier any
)
The idea of strings is deceptively simple, and as a consequence inadvertently broad.
Essentially one imagines a curve within a space of some number of dimensions. This curve is 'linear', meaning that one can use a single number/parameter to identify a point on it uniquely. Mathematically the points on the curve are a function of the co-ordinates of the enclosing space, but there is redundancy - so that one can re-express each of the co-ordinates as a function of a single common parameter. This parameter could be thought of as the distance along the curve from start to finish.
Immediately this suggests two types of strings - open and closed.
The open ones have the start and finish points non-identical, so the ends are 'free'.
The closed ones have the start and finish points identical, so we have a 'loop'. Restating this in math terms : the functions for the co-ordinates of the points on the string have the characteristic that they are cyclic for the single common parameter ( the functional value is identical for any given parameter value when compared to that same parameter value plus a multiple of some 'period' ).
Either type of string has certain requirements placed on it's describing functions, so as to satisfy general ideas of symmetry, conservation laws, relativity etc ..... that we believe should be obeyed.
I like to think of strings as objects which 'store' characteristics like energy. One 'postdiction' of string theory is the numbers of dimensions for the enclosing space. Roughly this reflects the fact that if you want to represent several independent qualities for a given string ( energy/mass, charge, some other 'quantum' numbers..... ) then it must have the ability to 'wiggle' in a certain minimum number of independent directions. That way it can keep separate the information about it's internal state in different 'modes' or 'slots'.
Anyhows there are many, many ways to satisfy what we know strings should do based on current constraints for their design. This has been embarassing in that our universe seems to be only one of a humungous number of possiblities, and as yet there is no selection principle or extra concept to hone the theory down to even any 'nearby' variant. It needs one ( or more ) of these to allow calculations to proceed to testable numbers.
So, in answer to the original question the answer is : maybe.... :-)
Cheers, Mike.
I have made this letter longer than usual because I lack the time to make it shorter ...
... and my other CPU is a Ryzen 5950X :-) Blaise Pascal