Mordred

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About Mordred

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    Resident Expert

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    http://www.Cosmology101.wikidot.com

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  • Gender
    Male
  • College Major/Degree
    University of the Caribou
  • Favorite Area of Science
    cosmology and particle physics

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  1. Handedness of Charge

    Belief isn't very scientific. Charge handedness involves vector symmetry. This isn't based on belief but on the mathematical relations of vectors under symmetry. Right handed and left handed charge is rather meaningless as charge polarity itself is an arbitrary choice of which to assign as positive or negative. In point of detail handedness is involved in charges other than the electromagnetic. In all cases it is an assigned vector relation under graph ie an increase in right handed trends towards an increase in positive values. Its only fundamental purpose is its behavior when modelled under graphs in the same manner posotive and negative charge behaves when graphed. Charge is simply a term assigned to attraction. The stronger the attraction the greater the amount of charge.
  2. test Ameba test

    You need to place [math] on each side in the latter half so I don't activate the command tags replace the % with a / [math] \Delta [%math] [math]\Delta[/math] You will need to refresh the page to see if it worked as well
  3. Question about Rotation

    Where is the fun of learning in that type of answer
  4. What is a vacuum?

    Under Cosmology applications, as Swansont mentioned above the definitions vary. The vacuum is a scalar field with no inherent average directional component. The mean energy density itself can be greater or less than the mean ground state ie positive/negative vacuum. The ground state would be some arbitrary baseline state that is set at zero mathematically. Though its true value can be a nonzero energy/mass density.
  5. Why is time called a 4th dimension?

    Not that I am aware of. In many metrics the coordinates will often employ the following [math] {ct,x,y,z}={x^0,x^1,x^2,x^3}[/math] where the superscripts are indices and not powers. The indices can be interchanged to the subscripts ie [math]x_0[/math] following the covariant and contravariant rules under Einstein summation rules. GR,QFT and String theory all use the latter x coordinates. There is advatanges to using the latter when you use Natural units. https://en.m.wikipedia.org/wiki/Natural_units particularly under symmetry/ assymetry group relations
  6. Why is time called a 4th dimension?

    Lol actually you guys have accurately answered the Op's question. I would only like to add that by using the displacement of c via the usage of {ct} we get the dimensionality of length for the time component.
  7. Thanks for all the help so far. Thankfully there is enough hotspots around to connect that its not too great a worry lol just anooying
  8. Yes tried restarting phone. (usually my first step to troubleshooting electronics lol) yes bill is paid Tried a factory reset of software as well (after backing up data)
  9. Quantum Entanglement ?

    Out of the 6 String theory books I read, the link above teaches String theory in the most easily understood manner. It starts by detailing how String theory works with relativity and QM and provides valuable insights into all three topics. For example the fundamental differences between Heisenburg vs Schrodinger operators is discussed in one of its chapters. Its earlier chapters detailing the weak field limit on GR via the weak field approximation using the Minkowskii tensor via two observers S and S primed and how this relates the the lightcone gauge to the covariant and contravariant indices is one of the best methodologies I have yet to come across. In essence the book doesn't assume any priori in other related physics topics though still requires the priori of Calculus and differential geometry. PS the lightcone gauge itself is the null geodesic characteristics for massless particles such as the photon with ds^2=0 line element you mentioned above. The book does an excellent job describing the differences on the ds^2 worldlines for massive and massless particles.
  10. Lol my most nightmarish project over 20 years ago was a non profit company hired me to build a 12 by 10 by 6 foot rifle display cabinet. They had so little funds available that they supplied me with old wood from railroad tracks that they salvaged. I only had an 8 inch table saw, 1 jackplane and odds and ends hand woodworking tools. I build a table to support larger wood cuts on that 8 inch table saw and had to design my own jigs guides and antikickpack arrestors. I never wanted to photograph the end project even though the company liked the work. I personally was disgusted with the project. Though it was rewarding on one aspect. The sheer creative usage of making such a large project with a highly limitted selection of tools and materials. My clamps was made out of the same material and rope to tighten the clamps. (challenged my rope skills lol) as one example.
  11. Yes including other forums. The problem started precisely the same day as the server downtime to repair/replace the harddrives this particular repair http://www.scienceforums.net/topic/112454-happy-holidays-from-sfn/ Prior to that zero problems for over a year on same phone and phone provider. edit tested wife's phone same provider plan and phone make and model same problem.
  12. No its a personal phone through a Telus provider.
  13. Swansont did an excellent job answering this question. I would just like to add that I am glad to see you take the time to ask questions on my posts. Far too often I am forced to describe very complex topics as simple as possible. In many cases I end up forgetting to add essential details or go a little too heuristic. No worries I would rather people question my posts than simply accept them verbatim. How else does everyone learn lol. Its a common misconception that GR and QM are incompatible as mentioned above by Swansont QM does involve though when it includes GR involves a large body of particles sufficient to have messurable effect
  14. This problem started after the last server repairs. If I recall it was on the New years when the hard drives were being serviced. Since that time my mobile phone has not been able to connect using data however reliably connects using my home wifi. The message I recieve is "connection refused." I tried both full and mobile version from my phone same message.