Hi Jason,
Nothing "in the theory" suggests that landscapes are a problem! But
that is kinda my point, we have to use meta-theories of one sort or
another to evaluate theories. Occam's Razor is a nice example... My
point is that explanations should be hard to vary and get the result
that one needs to "match the data" or else it is not an explanation at
all. One can get anything they want with a theory that has landscapes.
Look!
http://en.wikipedia.org/wiki/String_theory_landscape
"The string theory landscape or anthropic landscape refers to the large
number of possible false vacua in string theory. The "landscape"
includes so many possible configurations that some physicists think that
the known laws of physics, the standard model and general relativity
with a positive cosmological constant, occur in at least one of them.
The anthropic landscape refers to the collection of those portions of
the landscape that are suitable for supporting human life, an
application of the anthropic principle that selects a subset of the
theoretically possible configurations.
In string theory the number of false vacua is commonly quoted as 10500.
The large number of possibilities arises from different choices of
Calabi-Yau manifolds and different values of generalized magnetic fluxes
over different homology cycles. If one assumes that there is no
structure in the space of vacua, the problem of finding one with a
sufficiently small cosmological constant is NP complete, being a version
of the subset sum problem."
Boom, there it is! The computation problem!
On 8/22/2012 2:31 AM, Jason Resch wrote:
What in the theory suggests that landscapes are a problem? Is there
any evidence in any theory that only one possible set of physical laws
has to pervade all of existence, or is this just an unsupported
preconception/hope of physicists who've spent a big chunk of their
lives looking for a unique theory?
To me, the effort of finding some mathematical explanation for why
only one set of physical law can be is a lot like the Copenhagen
theory's attempt to rescue a single history, despite that nothing in
the theory or the math would suggest as much.
Jason
On Tue, Aug 21, 2012 at 8:26 PM, Richard Ruquist <yann...@gmail.com
<mailto:yann...@gmail.com>> wrote:
Stephan,
I solved the landscape problem by assuming that each monad was
distinct
consistent with the astronomical observations that the hyperfine
constant
varied monotonically across the universe.
Richard
On Tue, Aug 21, 2012 at 4:28 PM, Stephen P. King
<stephe...@charter.net <mailto:stephe...@charter.net>> wrote:
On 8/21/2012 3:58 PM, Richard Ruquist wrote:
Steinberg P. Soft Physics from RHIC to the LHC.
arXiv:nucl-ex/09031471, 2009.
Kovtum PK, Son DT & Starinets AO. Viscosity in Strongly
Interacting Quantum
Field Theories from Black Hole Physics. arXiv:hep-th/0405231.
Good! Now to see if there any any other possible
explanations that do not have the landscape problem...
On Tue, Aug 21, 2012 at 3:48 PM, Stephen P. King
<stephe...@charter.net <mailto:stephe...@charter.net>> wrote:
On 8/21/2012 3:39 PM, Richard Ruquist wrote:
String theory predicts the viscosity of the quark-gluon
plasma
already found at the LHC and several other sites.
Hi Richard,
Could you link some sources on this?
On Tue, Aug 21, 2012 at 3:25 PM, Stephen P. King
<stephe...@charter.net <mailto:stephe...@charter.net>>
wrote:
On 8/21/2012 12:19 PM, meekerdb wrote:
On 8/21/2012 4:10 AM, Roger Clough wrote:
Hi guys,
Neither CYM's nor strings physically
exist-- instead, they represent things that exist.
Anything in equation form is itself nonphysical,
although the equations
might describe something physical.
The equations of string theory describe strings.
So how does it follow that strings aren't real.
That's like saying a sentence that describes my
house shows that my house isn't real.
I agree that string theory (or any other theory) is
a model of reality and not reality itself. But, if
it's correct, it refers to reality or at least some
part of reality - like, "My house is green." refers
to a part of reality, but "My house is blue." does not.
Brent
When and if string theory makes a prediction
that is then found to have a physical demonstration
we might be more confident that it is useful as a
physics theory and not just an exercise in beautiful
advanced mathematics. The LHC is looking for such
evidence...
For example, if I live at 23 Main street, 23 Main
Street is not my house,
it is my address.
Roger Clough, rclo...@verizon.net
<mailto:rclo...@verizon.net>
8/21/2012
--
Onward!
Stephen
"Nature, to be commanded, must be obeyed."
~ Francis Bacon
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