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String Theory | Explored

Updated on November 24, 2013
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String Theory

Understanding the universe is a monumental task, yet many scientists dedicate themselves to this task with great vigor. The ultimate goal in physics is to try to understand everything, yet physicists have run into countless problems with the theories that have arisen.

Theories are found, analyzed, and rejected. Careers are made and lost on hypotheses. Physicists run through the halls with the news of discoveries, yet the most monumental breakthrough will grab and pull their attention away. The latest theory to have the attention of the scientific community is something out of science fiction. It is a theory that seems unreal and plausible at the same time.

The theory that has everyone in an uproar is string theory. This theory is changing everything that was ever known about physics. String theory has the potential to show that the laws of the universe are reflections of one grand physical principle, one master equation. The String Theory of Supersymmetry explains how quantum mechanics and general relativity can coincide in the quantum and dimensional realms.

The Theory Summarized

The Supersymmetry String Theory is a complex theory that is trying to explain everything. It strives to present what the universe is composed of at a subatomic level, and how that composition affects the whole universe.

This Superstring Theory, as it’s otherwise known, gives us a very simple explanation to what everything is made of. According to this theory, the whole universe is composed of ultra-subatomic vibrating strings. These strings are present in everything; they make up everything. The preferred pattern of the vibration of a string appears as a particle whose “mass and force charges are determined by the string’s oscillating pattern” (Greene, Elegant 15).

In other words, the vibration of the string determines which molecule it is. Its vibration will tell whether it forms a proton, neutron, electron, or a quark. These molecules will then go on to make everything that is known, and that is not known, in the universe and beyond. The introduction of strings into the equation means that particles cannot be point-like, as they are perceived in quantum mechanics.

The easiest way to visualize a string is to think of violin players. Every note that they produce has its own vibration. These vibrations come together to make notes that will turn into a melody, and, in the end, our universe is one grand orchestra. This orchestra of vibrating strings is what has the whole physics world exited, because, for the first time, they have come across a solution to bring quantum mechanics and general relativity together in one “theory of everything” (Huang 35).

According to general relativity, time flows differently at different positions due to the distortion of space-time by a nearby massive object. A single clock being in a superposition of two locations allows probing quantum interference effects in com
According to general relativity, time flows differently at different positions due to the distortion of space-time by a nearby massive object. A single clock being in a superposition of two locations allows probing quantum interference effects in com | Source

Quantum Mechanic & General Relativity

There are two fundamental pillars on which physics rests: quantum mechanics and general relativity. Quantum mechanics provides the mathematical descriptions of particle and wave-like behavior in the universe. It deals with how particles move, interact, and rebound with one another (Greene, Cosmos 330). In this realm everything is constantly in motion. Everything in the universe undergoes “quantum fluctuations” that become increasingly turbulent (Greene, Elegant 152). The surface of quantum mechanics can be viewed as the surface of the ocean during a storm, since it is always moving and nothing can harness its energy.

General relativity, on the other hand, is very different. General relativity deals with gravity and the smooth geometrical structure of time and space; it deals with all the big objects. It incorporates Newton’s laws of gravity and special relativity to explain the curvature of spacetime (Greene, Cosmos 335). Its surface is smooth and resembles the surface of smooth ice. These two theories are very different, but joining them together is essential in order to solve some of the universes mysteries. When scientists try to study objects like black holes, they run into problems. Since a black hole is able to compress large objects into a subatomic size, scientist must use both theories to solve it, but the two theories do not work together. When the two theories are put together, the result is infinity, and ultimately the underlying general relativity is destroyed. The smooth layer of spacetime cannot withstand the quantum jitters. This is where strings come into play. If strings are used instead of point-like molecules, then the constant movement in the quantum realm will consist of smooth transactions rather than violent ones. The Superstring theory has the ability to ameliorate the hostilities between the gravitational forces and quantum mechanics (Greene, Elegant 152). It shortens the length of the quantum jitters to “Planck’s Length of 10-33cm high” (Theoretical). This allows for agreement, but it also presents physics with a new mystery: the introduction of six more dimensions and one more of time (Yau 125).

Dimensions in String Theory

The universe as most people view it consists of four dimensions; three of space and one of time. The Superstring theory introduces seven new dimensions to these four. These dimensions are curled up too small for humans, microscopes, or particle colliders to see. It is in these dimensions that strings are able to move and vibrate in many ways, most of which are inconceivable to the human mind (Hawking, History 130).

All of these extra dimensions are curled up into what is called “the internal space” (Hawking, Grand 116). This “internal space” is further known as the “Calabi Yau Manifold” (Yau 136). It is here that the strings, in a sense, live. To get a better understanding why we cannot view these extra dimensions, think of an electric line. When viewing an electric line from twenty feet away, it looks like a straight two dimensional line, yet if it is seen up close, it is apparent that it has curvature, thus making it three dimensional. Since these extra dimensions are 10-26 cm small, we cannot view the lines or curves of the outer planes of these dimensions, but the mathematical equations of Superstring Theory state that they must exist (Hawking, History 130).

These extra dimensions also allow for D-Branes to exist. D-Branes are surfaces within the 10-dimensions of space that open ended strings can attach themselves to. It is upon these stretched out strings, which are D-Branes, that our universe resides (Jones 191). These D-Branes lead physicist to believe that there are either “many different universes or many different regions of a single universe, which may consist with its own laws of science” (Hawking, History 130). These are all the basic concepts in Supersymmetry String Theory, but the catch to string theory is that this is not the only theory.

String Thery in Two Minutes

Different Theories of Everything

While there are different string theories out there, they all strive to be the ultimate theory of everything. The things that all string theories have in common are the strings, the need for the merging of quantum mechanics and general relativity, and the presence of extra-dimensions. Two theories, at present, are leading the race, and these are the Supersymmetry String Theory and the Bosonic String Theory. There are three basic differences between the two theories. In Bosonic Theory there are 26-dimensions, tachyons, and the use of bosons without partner fermions (Jones 166). Supersymmetry uses both bosons and fermions to explain the forces on matter in the quantum and dimensional realms, which offers a more realistic interpretation then The Bosonic String Theory, which only offers bosons to explain forces exerted on the quantum and dimensional reams.

Supersymmetry

In Supersymmetry there are bosons and fermions. They are often called “superpartners” because, essentially, one cannot exist without the other. Bosons are units of force, such as gravitons and photons, while fermions are units of matter, such as electrons and neutrinos.

This theory creates symmetry between the matter and forces in the universe (Jones 173). Symmetry in physics is basically a “situation where two properties can be swapped throughout the system and the results are precisely the same” (Hooper 181). This symmetry between superpartners is “essential for understanding any kind of manifold” (Yau 132). Symmetry makes all sorts of problems easier to solve.

For instance, if all the solutions for the equation xy= 4 were to be found, it would take awhile, as there is an infinite number of solutions. If, however, symmetry were imposed as x=y, then there are just two solutions: 2 and -2. Fermions are very essential in everyday life, because electrons are the half-integer spinners in the partnership with the full spinning boson particles.

The Bosonic String Theory

The Bosonic String Theory is very similar to the superstring theory, but it contains bosons without superpartners, 26-dimensions, and tachyons. The Bosonic Theory offers bosons as the sole units of force in the universe without fermions to represent units of matter. So, photons can exist, but not electrons or quarks (Jones 168). This offers a problem, because in order for this theory to work in the real world, it must include fermions to correct the natural balance in the quantum realm. Without symmetry between bosons and fermions, curling the 25-spatial dimensions into Calabi Yau Manifolds would be nearly impossible, let alone the fact that 25-spatial dimensions are too many to find logical uses for (Jones 169).

The main problem with Bosonic String Theory is the presence of the tachyon. The tachyons are particles that travel faster than the speed of light. Einstein’s theory of relativity does not forbid objects from traveling faster than the speed of light, but to do so “would require an infinite amount of energy, because tachyons would always be moving faster than the speed of light” (Jones 167). Solutions that contain tachyons “will always decay into another, lower energy solution—possibly in a never-ending cycle” (Jones 167). The absence of the fermions in the Bosonic theory seems to be its downfall, for without them the theory cannot find a logical and symmetrical solution.

Superstring all the Way

The universe is a never-ending cosmos of fascination. All physics can do at the moment is try to understand why and how it works. Theories on the origins of the universe are constantly being hypothesized and rejected.

The Supersymmetry String Theory, though, is unlike previous theories, for it has the capacity to answer primordial questions that have to do with nature’s most fundamental constituents and forces. This theory has made it possible to incorporate quantum mechanics and general relativity into a field where they can coincide through the use of strings.

Strings allow for a better understanding of the functions of the smallest particles. Multiple dimensions are another mystical by-product of string theory, and they could lead to the discovery and interaction into parallel universes. Though there are other string theories, Supersymmetry offers a more comprehensible understanding that is compatible with the real world and existing theories, since it allows for the electrons, that are already known particles, to exist.

The Bosonic Theory lacks fermions, which are vital particles. The theory also incorporates tachyons, which cannot logically exist, since they travel faster than the speed of light. Some may argue that a universe cannot be as complex as string theory sets out to make it, yet as the Anthropic principle states, “we see the universe the way it is because we exist.”

Superstring theory has the potential to bring about greater achievement in the years to come, and many are along for the ride.

Fantastic Documentary On Sting Theory

This fantastic documentary takes you into the world of strings; from the history of their discovery to their possible implications for the future of particle physics. This science video is in no means boring.

Works

Green, Brian. The Elegant Universe. New York: W.W Norton & Company Inc, 1999. Print.

Greene, Brian. The Fabric of the Cosmos. New York: Random House, 2004. Print.

Gubser, Steven. The Little Book of String Theory. New Jersey: Princeton University Press, 2010. Print.

Hawking, Stephen. A Brief History of Time. New York: Random House Inc. Print.

Hawking, Stephan. The Grand Design. New York: Randon House Inc, 2010. Print.

Hooper, Dan. Nature’s Blueprint.New York: HarperCollins, 2008. Print.

Huang, Fannie. Quantum Physics: An Anthology of Current Thought.New York: Rosen Publishing Group, 2006. Print.

Jones, Andrew Zimmerman, Daniel Robbins. String Theory for Dummies. Indianapolis: Wiley Publishing, 2010. Print.

“Theoretical Physics.” The Official String Theory Web Site. 1998-2010. Web. 1, Dec. 2010 http://superstringtheory.com/index.html

Yau, Shing-Tung. The Shape of Inner Space. New York: Basic Books, 2011. Print.

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    • AverageWriter1 profile image

      AverageWriter1 4 years ago from California

      This is an extremely informative piece. I enjoyed reading it.

    • annajazz profile image
      Author

      Anna Marie 4 years ago from New Mexico

      Thank you! I am glad you liked it.

    • AverageWriter1 profile image

      AverageWriter1 4 years ago from California

      You're welcome!

    • f_hruz profile image

      f_hruz 4 years ago from Toronto, Ontario, Canada

      Thanks for this great hub and for presenting the current state of discussion on these complex ideas.

      My questions to you are the following:

      1 - Is the subatomic micro cosmos of particle physics not in itself a concrete reality uniquely different from our human reality in which we try to live and apply our regular, every day scientific research into astronomy, chemistry, biology, genetics, etc?

      2 - Don't we have to try to discover more cosmological facts which would explain not only the creation of our universe a bit better, but also provide some indication as to how possible parallel universes may have some ongoing impacts on the real world conditions of our life on the one we are currently part of?

      3 - How can one actually conduct such theoretical research successfully when it is so far removed from any possible practical application to provide any kind of prove of conforming to the real world?

      Thank you very much,

      Franto

    • annajazz profile image
      Author

      Anna Marie 4 years ago from New Mexico

      Thanks :)

      1. Particle physics is vastly different. First off it is basically another world. The laws that govern us can't even be applied(at our current knowledge) to this world.(though great effort is being applied to the standard model theory to try and unite the mathematical of the micro cosmos and the mega world that we experience every day) Gravity has no effect, magnetic fields react differently, and radiation is really the only thing that is applicable to both. Though, in reality, radiation is a change at the molecular level that has an impact on the Mega world(mega as in anything bigger then an atom). Standard physics cannot be applied. In our life you can throw a ball and calculate both its position and its momentum at any given time, but in the micro world, Heisenberg's Uncertainty Principle claims that you cannot know both the position and momentum of an electron with total certainty t any given time. This is because electrons act both as particles and waves(but I wont go to into that at the moment). It is all quit fascinating really.

      2. That is what String theory is trying to prove. At the moment it is a theory with backing, yet not a Law of Physics. The resent discovery of the Higgs Boson is another piece of this puzzle. It is through the discovery of these new particle that lends more data to be analysed for these theories. But I totally agree that more mathematical backing needs to be applied before this can go anywhere beyond the theoretical state. Brian Greene, the author and Narrator, of the Elegant Universe documentary and book presents a great argument about the possible repercussions of multiple planes effects on each other. One theory of its understanding is that all possible realities of this life happen on an infinite plane. On one plane, I may turn left at the stop sign, another I would turn right, and at yet another I would turn around to get my phone I left at my house. And, since all actions lend to the outcome of our lives, the amount of plane(parallel universes) never ends. Though, I believe scientists have to come to some kind of agreement regarding the Big Bang theory before we can concretely look deeper into the matters of parallel universes.

      3. It is really all a matter of mathematical formulation at the moment. It is kind of like the Higgs Boson. It was mathematically proven to exist a while ago, yet there was not a way to physically prove it until the particle accelerates (CERN and FERMI) where built. And, just this past summer, they where able to prove it's existence. I believe that once the math behind this concept is complete(the strings), that there will be tests that can be conducted to see of its possibility. CERN may be modified to be able to detect these strings in the same manner that is was used to look for the Higgs. If we are ever able to explore, more in depth, a black hole, we may find math that lends to that already known regarding parallel universes.

      Thanks for enjoying my hubs. If I need to expand any on the answers to your questions, please ask. lol I tend to talk at a high level when I get going with this stuff.

      -annajazz

    • f_hruz profile image

      f_hruz 4 years ago from Toronto, Ontario, Canada

      Thanks Anna, I admire your ability to relate to all these strange, new ideas.

      I watched some of Brian Green's videos, one of them was "The Fabric of the Cosmos". I got the feeling he likes to use real science to dazzle people how close it actually comes to science fiction ...

      It's all very interesting how they come up with all these theories about Black Holes, how they work and what they can do to space and time, and then you get all these strange ones looking for a god to help them understand what it's all about - ahahaha

    • annajazz profile image
      Author

      Anna Marie 4 years ago from New Mexico

      Thank you for the complement.

      I am glad that you enjoyed Green's videos. I often times re-watch them as it was this documentary that got me interested in string theory in the first place.

      I would not necessarily disbelieve that a God may, or may not, exist as it were. As these theories teach us; we find that more and more dis-believable things are out there. The concept of God is one of those things that still puzzles me, and I have yet to come to a decision on.

      I hope you will pursue your reading on these great new theories that are popping up throughout this turn of the century.

      -annajazz

    • Neil Radow profile image

      Neil Radow 24 months ago from Tel Aviv

      A nice overview of String Theory that is accessible and easy to read. In my opinion, it misses a few key points, but with a subject as broad as string theory that is to be expected.

    • Flip Movie Script profile image

      Flip Movie Script 23 months ago from Washington

      Really well done! I briefly explained it in my hub. It was more important for the reader to understand what was occurring in the specific movie. It is unbelievably complex and is something I need to keep reading about because it is so incredible. I might need someone to take a look at what I wrote to make sure I am not pulling things from the wrong places.

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