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{{String theory}}
 
'''F-theory''' is a branch of [[string theory]] developed by [[Cumrun Vafa]].<ref>Cumrun Vafa. "Evidence for F-theory" [[arXiv]]: [http://arxiv.org/abs/hep-th/9602022 hep-th/9602022]</ref> The new [[vacua]] described as F-theory were discovered by Vafa, and {{cl-span|it|date=October 2012}} also allowed string theorists to construct new realistic vacua — in the form of F-theory [[compactification (physics)|compactified]] on elliptically fibered [[Calabi–Yau]] four-folds. The letter "F" supposedly stands for "Father".<ref>[http://www.youtube.com/watch?v=fW6JFKgbAF4&feature=relmfu Michio Kaku: The Universe Is a Symphony of Vibrating Strings - YouTube]</ref>
 
==Compactifications==
F-theory is formally a 12-dimensional theory, but the only way to obtain an acceptable background is to [[Compactification (physics)|compactify]] this theory on a [[torus|two-torus]]. By doing so, one obtains [[type IIB string|type IIB]] [[superstring theory]] in 10 dimensions. The [[SL(2,Z)]] [[S-duality]] symmetry of the resulting type IIB string theory is manifest because it arises as the group of [[large diffeomorphism]]s of the two-dimensional [[torus]].
 
More generally, one can compactify F-theory on an elliptically fibered [[manifold]] ([[elliptic fibration]]), i.e. a [[fiber bundle]] whose fiber is a two-dimensional torus (also called an [[elliptic curve]]). For example, a subclass of the [[K3 manifold]]s is elliptically fibered, and F-theory on a K3 manifold is dual to [[heterotic string]] theory on a two-torus. (Eight dimensions are large.)
 
The well-known large number of semirealistic solutions to string theory referred to as the [[string theory landscape]], with <math>10^{500}</math> elements or so, is dominated by F-theory compactifications on [[Calabi–Yau four-fold]]s.
 
==Phenomenology==
New models of [[Grand Unified Theory|unification of the fundamental forces]] have recently been developed using F-theory.<ref>[http://arxiv.org/abs/1001.0577 [1001.0577&#93; Particle Physics Implications of F-theory]</ref>
 
==Extra time dimensions==
F-theory, as it has [[metric signature]] (11,1), as needed for the Euclidean interpretation of the compactification spaces (e.g. the four-folds), is not a [[multiple time dimensions|"two-time" theory of physics]].
 
However, the signature of the two additional dimensions is somewhat ambiguous due to their infinitesimal character. For example, the [[supersymmetry]] of F-theory on a flat background corresponds to type IIB (i.e. (2,0)) supersymmetry with 32 real supercharges which may be interpreted as the dimensional reduction of the chiral real 12-dimensional supersymmetry if its spacetime signature  is (10,2). In (11,1) dimensions, the minimum number of components would be 64.
 
== See also ==
 
* [[Dilaton]]
* [[Axion]]
 
==References==
{{reflist}}
 
{{DEFAULTSORT:F-Theory}}
[[Category:String theory]]
 
 
{{string-theory-stub}}

Revision as of 21:58, 3 March 2014

Making the computer run swiftly is very easy. Most computers run slow because they are jammed up with junk files, that Windows has to search through each time it wants to find something. Imagine needing to discover a book inside a library, but all library books are in a big big pile. That's what it's like for the computer to find anything, when your system is full of junk files.

StreamCI.dll errors are caused by a amount of different problems, including that the file itself has been moved on the system, the file is outdated or you have installed certain third-party audio drivers that are conflicting with all the file. The wise news is the fact that if you need to solve the error you're seeing, you need to look to first guarantee the file & drivers are functioning okay on a PC and then resolving any StreamCI.dll errors which may be inside the registry of your computer.

Your PC may moreover have a fragmented hard drive or the windows registry would have been corrupted. It may also be as a result of the dust plus dirt which should be cleaned. Whatever the problem, you can always discover a answer. Here are certain tricks on how to create your PC run quicker.

How to fix this problem is to initially reinstall the program(s) causing the mistakes. There are a lot of different programs which use this file, but 1 could have placed their own faulty version of the file onto the program. By reinstalling any programs that are causing the error, you'll not only let the PC to run the program properly, yet a fresh file is placed onto your system - exiting your computer running as smoothly as possible again. If you try this, and discover it refuses to function, then we should look to update a program & any software you have on the PC. This will probably update the Msvcr71.dll file, allowing the computer to read it properly again.

Whenever it comes to software, this really is the vital part because it is the one running your system in addition to different programs required in the functions. Always keep the cleanliness of the system from obsolete data by getting a superior tuneup utilities 2014. Protect it from a virus online by providing a workable virus protection program. You must also have a monthly clean up by running the defragmenter system. This way it usually enhance the performance of the computer plus for you to avoid any errors. If you think something is wrong with all the software, plus you don't know how to fix it then refer to a technician.

Reinstall Windows 7 - If nothing appears to work, reinstall Windows 7 with all the installation disc which came with all the pack. Kindly backup or restore all your information to a flash drive or another hard drive/CD etc. before performing the reinstallation.

The first reason your computer could be slow is because it requires more RAM. You'll notice this matter right away, especially in the event you have less than a gig of RAM. Most unique computers come with a least which much. While Microsoft states Windows XP could run on 128 MB, it and Vista certainly need at least a gig to run smoothly plus allow you to run several programs at when. Fortunately, the price of RAM has dropped greatly, and there are a gig installed for $100 or less.

All of these issues is conveniently solved by the clean registry. Installing the registry cleaner allows we to use a PC without worries behind. You may able to utilize you system without being afraid which it's going to crash inside the middle. Our registry cleaner might fix a host of errors on your PC, identifying missing, invalid or corrupt settings in your registry.

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