Search results

  1. F

    Great Website

    I found a great website on how to apply for a physics PhD: She has sample statements of purpose, timelines and whatnot. John G.
  2. F

    Practical questions

    Another way to save perimeter institute video is to use the VLC media player. This is a free cross-platform media player available here: If you need support for the VLC media player you can go here: Good Luck John G.
  3. F

    Zwiebach's string theory book

    Hello everyone, I've sent the Zwiebach solution set to every email on page 3 of this thread. I have also added the file to my emule file sharing folder, but with only three sources it may take a while to download. So if you can please add the solution set to your file sharing folder. John G.
  4. F

    Zwiebach's string theory book

    I'll put the zip file available for download via emule, of course you will need a little patience. Here is a link...
  5. F

    Zwiebach's string theory book

    If sending the solutions directly to someone's email is problematic then I suggest you use: It is a free email service that allows you to send an email message with a large attachment (< 100MB) to any email address or addresses. The way it works is you upload the...
  6. F

    Mathematica Mathematical methods of String Theory

    You're right self adjoint. The range of mathematical subjects that need to be mastered at some depth is quite daunting, even for a mathematican. John G.
  7. F

    Mathematica Mathematical methods of String Theory has a list of the mathematical subjects you will need to learn: Good Luck John G.
  8. F

    Peak Oil

    Hello everyone, as you may well know gas prices are high and will probably remain high for a little while. Yet, there is one thing people rarely talk about and that is that oil is a non renewable resource and there is only a finite amount left in the earth. In the long run gas prices will...
  9. F

    Dimensional Model

    Here are some images of "Calabi-Yau" projections:" Here is the definition of a "Calabi-Yau" space: Though not exactly what you may be looking...
  10. F

    About this whole question of when a theory is scientific

    Let's all just calm down, this is getting personal. Taking personal shots at Peter Woit and Lee Smolin won't help your arguement. You're making the implict logical assumption that given enough understanding string theory will be able to make falsifiable predictions and that one day we will...
  11. F

    About this whole question of when a theory is scientific

    Hello Josh1 Nope I don't claim anything new, it's just that Peter Woit and Lee Smolin are leading researchers in the field with a deep understanding of String theory and LQG, and I value their opinions quite highly. The message I intended to convey is simply that string theory is in crisis...
  12. F

    About this whole question of when a theory is scientific

    Don't take my word for it, you can reference Peter Woit's blog: and Lee Smolin's Take On the Current State of Fundemental Physics...
  13. F

    About this whole question of when a theory is scientific

    String theory is in principle testable but, it is not falsifiable, for whatever the results of any experiement the string theorist can tweak one of the many parameters to make the theory fit the data. My impression of string theory is that theorists used advanced mathematical techniques to...
  14. F

    Different orders of dimensions

    You still haven't answered the question, what is a dimension? You use the word dimension but do you know what it means? John G.
  15. F

    Different orders of dimensions

    Before we even begin to talk about dimensions, we must ask the following questions: what is a dimension physically? What is space physically? Before we can order dimensions we must be clear as to what exactly we are talking about. Also what is the conceptual difference between dimension and the...
  16. F

    Dimensional Properties of Energy

    First of all you must define what you mean by "dimension". There are mathematical definitions of dimension but what does it mean physically? What property of the physical universe can we identify with dimension? The number of coordinates needed to locate an object in space? This leads to the...
  17. F

    Multiply connected spaces

    The notion of a space being "connected" is a topological one. Here is a good explaination of what it means for a set to be "connected"." [Broken] Now a multiply connected set is one that is connected by not simply connected, once again here is...
  18. F

    A democracy of spacetimes?

    This is a great discussion, creating and exploring new ideas is very important in physics but, we need to make sure that our ideas or theories are scientific. First you need to develop the idea sufficiently so that it becomes a theory, then you need to develop the formalism necessary to...
  19. F

    Pdf's on newer theories and advancements in string theory

    Actually the entire HEP archive in is available for download via bittorent: [Broken] You might want to try it. John G.
  20. F

    Ed Witten's early years?

    Why don't you ask him yourself: If he is too busy to respond, ask one of his research buddies. John G.
  21. F

    Ed Witten's early years?

    Check out wikipedia and his homepage John G.
  22. F

    Mathematica Mathematical Prerequisites For Understanding String Theory

    This is true, but my statement does not exclude this possibility: Nowhere did I say that the theories "do not" attempt to explain already existing phenomenon, or that the theories are not based on experimentation. I guess I should have made it more clear. You are reading things into my...
  23. F

    Mathematica Mathematical Prerequisites For Understanding String Theory

    Its not that the most brilliant minds in physics are ignorant of the philosophy of "real science", rather they are following the well tested methods of theoretical physics. In theoretical physics you construct the model/theory first and then develop it sufficiently so that your theory can...
  24. F

    Mathematica Mathematical Prerequisites For Understanding String Theory

    Be Careful Here is a thread that might help answer your question: John G.
  25. F

    Lisa Randall's Warped Passages

    Lisa Randall On Coast to Coast Hello everyone, Lisa Randall will do a radio interview tonight (Jan 30, 2006) on Coast to Coast am with George Noory. See for yourselves: Coast To Coast Am The show begins at 10pm (Pacific Standard Time), if you can't listen to the show on the radio you can...
  26. F

    Lisa Randall's Warped Passages

    Wow Super intelligent and HOT, I would definitely like to meet her during office hours, give me some tutoring on string theory:cool: . John G.
  27. F

    Universe has a mind of it's own

    Big Question The one question I haven't seen addressed is this, if the universe had a mind would we be able to percieve it as such? This is akin to a neuron in our brain being able to percieve our minds much like we experience our minds in the "Descartes" sense. Though we are much more...
  28. F

    Spirituality? What is it?

    Some Help Analyzing the notion of spirituality in terms of death and consciousness simply pushes the ambiguous notion of spirituality onto other ambiguous notions, though the former two notions are more scientific. This goes to the heart of the mind-body problem. My philosophy is that what...
  29. F

    How to Learn Math and Write Proofs

    Hello everyone, I have a little website dedicated to helping people learn math, write proofs, and learn physics. I have a list of books to help people learn math and physics, links to free online books, and online courses. Please vist my website and if you have any questions feel free to email...
  30. F

    Practial IQ Improvment

    I'm Learning Much Thanks for the information Mandrake. You said: This is a very vague definition, "resource that is common to all cognitive abilities". First resource, what is this resource??? Second cognitive abilities what does this mean?? The ability to understand and solve problems...