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About Giovanni

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  1. I have posted also on
  2. I define the Schwinger limit as the minimal value for the E field to produce the Schwinger effect From the previous: Is not true. Ok finally i have found a clear explanations: Read the paragraph Schwinger effect the key words are "and continue to move apart". Personal hypothesis: So, since the distance between the now reals electron and positron increases they are not more a dipole: they are no more capable of absorbing photons (single electrons and positrons cannot absorb photons) for the Scharnhorst effect the speed of light increase. (sorry for me all those things are obvious....but for the readers are not)
  3. Yes but this is about 'Influence of the intensity on the propagation of light' ....and or me that's ok that there is no influence. I'm talking about the following paragraph. I thought that your statement was about relation between the Schwinger limit and the interaction between external fields and speed of light in vacuum Anyway searching for the dailymail article i discovered this: <<Quantum effects such as vacuum polarization in gravitational fields appear to permit "superluminal" photon propagation and give a fascinating new perspective on our understanding of time and causality in the microworld.>> I have not read it yet so i cannot say but it seems relevant.
  4. (Klaus Scharnhorst: peer reviewed and well known) From the previous article: paragraph 2.2.2 In short: with fields greater than Schwinger limit you can affect the speed of light. (or, at least, >= Schwinger limit it's a necessary condition)
  5. From the linked article: try now with the link at the post number 4.
  6. Edited: a cut and paste mistake. Sorry. Now works. Good point. With little time i will find the original source.
  7. I was motivated by this: Maybe there is a simpler explanation but anyway is interesting.
  8. Thanks for your answer. I believe that I will avoid the General Relativity (that I do not know) and I will use the Gravitoelectromagnetism ( (an approximation of the General Relativity similar to the Maxwell equations) that recently also has a 'quantum' version ( Since the equations are similar to those of Maxwell, the derivation of the threshold value should not be very different from that of the electromagnetic counterpart. (The Schwinger limit of Quantum Electrodynamics) Or at least I hope so. I really do not know the applicability conditions of the GEM approximation: they hold for so high fields? I will check this.
  9. Is there a gravitational variant of the Schwinger limit? I mean: a strong gravitational field can separate virtual dipoles with tidal forces. The force applied to the positron is different from that applied to the electron (though both are attractive) and, if this difference is high enough, the two particles can be separated permanently. Do you agree with this? Has this occurrence been studied in physics in the literature of the past? I have not found anything on the internet and it seems strange.