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<blockquote data-quote="unionman" data-source="post: 718131" data-attributes="member: 21107"><p>String theory posits that the <a href="http://www.bing.com/reference/semhtml/Electron" target="_blank">electrons</a> and <a href="http://www.bing.com/reference/semhtml/Quark" target="_blank">quarks</a> within an <a href="http://www.bing.com/reference/semhtml/Atom" target="_blank">atom</a> are not 0-dimensional objects, but 1-dimensional strings. These strings can move and vibrate, giving the observed particles their <a href="http://www.bing.com/reference/semhtml/Flavor_(particle_physics)" target="_blank">flavor</a>, <a href="http://www.bing.com/reference/semhtml/Charge_(physics)" target="_blank">charge</a>, <a href="http://www.bing.com/reference/semhtml/Mass" target="_blank">mass</a> and <a href="http://www.bing.com/reference/semhtml/Spin_(physics)" target="_blank">spin</a>. The strings make closed loops unless they encounter surfaces, called <a href="http://www.bing.com/reference/semhtml/D-brane" target="_blank">D-branes</a>, where they can open up into 1-dimensional lines. The endpoints of the string cannot break off the D-brane, but they can slide around on it.</p><p><a href="http://www.bing.com/reference/semhtml/File:String_theory.svg" target="_blank"><img src="http://a3.powerset.com/assets/orig/250px/String_theory.svg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> <a href="http://www.bing.com/reference/semhtml/File:String_theory.svg" target="_blank"><img src="http://www.bing.com/reference/images/wiki/magnify-clip.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p>Levels of magnification:</p><p>1. Macroscopic level - Matter</p><p>2. Molecular level</p><p>3. Atomic level - Protons, neutrons, and electrons</p><p>4. Subatomic level - Electron</p><p>5. Subatomic level - Quarks</p><p>6. String level</p><p></p><p></p><p>Since the string theory is widely believed to be a consistent theory of <a href="http://www.bing.com/reference/semhtml/Quantum_gravity" target="_blank">quantum gravity</a>, many hope that it correctly describes our universe, making it a <a href="http://www.bing.com/reference/semhtml/Theory_of_everything" target="_blank">theory of everything</a>. There are known configurations which describe all the observed fundamental forces and matter but with a zero <a href="http://www.bing.com/reference/semhtml/Cosmological_constant" target="_blank">cosmological constant</a> and some new fields.<a href="http://www.bing.com/reference/semhtml/String_theory?fwd=1&src=abop&qpvt=string+theory&q=string+theory#cite_note-13" target="_blank">[14]</a> There are other configurations with different values of the cosmological constant, which are <a href="http://www.bing.com/reference/semhtml/Metastable" target="_blank">metastable</a> but long-lived. This leads many to believe that there is at least one metastable solution which is quantitatively identical with the <a href="http://www.bing.com/reference/semhtml/Standard_model" target="_blank">standard model</a>, with a small cosmological</p></blockquote><p></p>
[QUOTE="unionman, post: 718131, member: 21107"] String theory posits that the [URL="http://www.bing.com/reference/semhtml/Electron"]electrons[/URL] and [URL="http://www.bing.com/reference/semhtml/Quark"]quarks[/URL] within an [URL="http://www.bing.com/reference/semhtml/Atom"]atom[/URL] are not 0-dimensional objects, but 1-dimensional strings. These strings can move and vibrate, giving the observed particles their [URL="http://www.bing.com/reference/semhtml/Flavor_(particle_physics)"]flavor[/URL], [URL="http://www.bing.com/reference/semhtml/Charge_(physics)"]charge[/URL], [URL="http://www.bing.com/reference/semhtml/Mass"]mass[/URL] and [URL="http://www.bing.com/reference/semhtml/Spin_(physics)"]spin[/URL]. The strings make closed loops unless they encounter surfaces, called [URL="http://www.bing.com/reference/semhtml/D-brane"]D-branes[/URL], where they can open up into 1-dimensional lines. The endpoints of the string cannot break off the D-brane, but they can slide around on it. [URL="http://www.bing.com/reference/semhtml/File:String_theory.svg"][IMG]http://a3.powerset.com/assets/orig/250px/String_theory.svg[/IMG][/URL] [URL="http://www.bing.com/reference/semhtml/File:String_theory.svg"][IMG]http://www.bing.com/reference/images/wiki/magnify-clip.png[/IMG][/URL] Levels of magnification: 1. Macroscopic level - Matter 2. Molecular level 3. Atomic level - Protons, neutrons, and electrons 4. Subatomic level - Electron 5. Subatomic level - Quarks 6. String level Since the string theory is widely believed to be a consistent theory of [URL="http://www.bing.com/reference/semhtml/Quantum_gravity"]quantum gravity[/URL], many hope that it correctly describes our universe, making it a [URL="http://www.bing.com/reference/semhtml/Theory_of_everything"]theory of everything[/URL]. There are known configurations which describe all the observed fundamental forces and matter but with a zero [URL="http://www.bing.com/reference/semhtml/Cosmological_constant"]cosmological constant[/URL] and some new fields.[URL="http://www.bing.com/reference/semhtml/String_theory?fwd=1&src=abop&qpvt=string+theory&q=string+theory#cite_note-13"][14][/URL] There are other configurations with different values of the cosmological constant, which are [URL="http://www.bing.com/reference/semhtml/Metastable"]metastable[/URL] but long-lived. This leads many to believe that there is at least one metastable solution which is quantitatively identical with the [URL="http://www.bing.com/reference/semhtml/Standard_model"]standard model[/URL], with a small cosmological [/QUOTE]
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