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      "body": "I recommend the excellent play by Bertold Brecht: [Life of Galileo](https://en.wikipedia.org/wiki/Life_of_Galileo)",
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      "body": "Who has watched Star Trek\n\nhttps://www.youtube.com/watch?v=j5QIoKvlgvY\n\nor the more recent  Interstellar <a name=\"footnote1\"><sup>1</sup></a>,\n\nhttps://www.youtube.com/watch?v=yTpbZ_Psbeo\n\nhas an ideia of what they are: shortcuts in spacetime that allow intrepid space explorers to cover vast distances in very little time,  apparently connecting two distant regions of the universe, like in this two-dimensional representation below:\n\n\n![s-wormhole3.jpg](https://steemitimages.com/DQmez99T3JxEjDifBaTy3TDGLAHDpVjP24t5J6dWSUWkzK9/s-wormhole3.jpg)\n[Source: \"The Science of Interstellar\", de Kip Thorne]\n\nThe term wormhole was coined by John Wheeler, who was also the author of many curious names in gravitation physics, such as blackholes. In this case, he is referring to the tunnel a worm makes inside an apple, connecting to \"distant\"  regions on the apple's surface:\n\n![s-i_088.jpg](https://steemitimages.com/DQmdkNX9o1EvXLintTykc15uN1wgc2gRUW9LjVGxnXyEYTb/s-i_088.jpg)\n[Source: \"The Science of Interstellar\", de Kip Thorne]\n\nBut do these things actually exist? Even better, let us try to answer a much simpler question: are these things possible? Well, the answer is at the end, so bear with me. \n\nKarl Schwarzschild [1872-1916] was a german physicist and astronomer who became immediately known for publishing in 1916 a famous solution to the Einstein field equations. His solution describes the exterior gravitational field of a spherically symmetric body - like the gravitational field of our sun. The Schwarzschild solution, as it is called, is an exact solution of the Einstein equations in vacuum,\n\n![](https://chart.googleapis.com/chart?cht=tx&chl=%24%24R_%7Bij%7D-%5Cfrac%7B1%7D%7B2%7DRg_%7Bij%7D%3D0%24%24)\n\nwhere typically (in four dimensions) the indices i and j take on the values 1,2 and 3 for the three spatial coordinates and the value 4 for the temporal coordinate. (Actually, in the physics literature, it is more common to assign the value 0 for the temporal coordinate).\n\nThese are the differential equations for the metric   ![](https://chart.googleapis.com/chart?cht=tx&chl=%24g_%7Bij%7D%24).  Think of the metric as a symmetric  4x4  matrix whose components are infinitely differentiable functions of the coordinates used to describe spacetime.\nWhat does the metric describe?  A physicist will tell you it describes the geometry of spacetime, since if you know the metric, you can calculate the distance (in four dimensions) between two neighboring points.\n\nTo fix ideas, think of the cartesian system in two dimensions, described by the cartesian system of coordinates  ![](https://chart.googleapis.com/chart?cht=tx&chl=%24%20(x%2Cy)%20%24), with  ![](https://chart.googleapis.com/chart?cht=tx&chl=%24%20x%20%24) being the horizontal axis and ![](https://chart.googleapis.com/chart?cht=tx&chl=%24%20y%20%24) being the vertical axis.  A point in this system is described by a pair of numbers: its coordinates with respect to the  horizontal and vertical axes. Suppose this point has the coordinates  ![](https://chart.googleapis.com/chart?cht=tx&chl=%24%20(x%2Cy)%20%24). Then a very close point will have coordinates  ![](https://chart.googleapis.com/chart?cht=tx&chl=%24(x%2Bdx%2Cy%2Bdy)%24), and the squared distance between these points, using the Pythagoras theorem,  is  ![](https://chart.googleapis.com/chart?cht=tx&chl=%24%20dx%5E2%2Bdy%5E2%20%24). It is common to represent this squared length as    ![](https://chart.googleapis.com/chart?cht=tx&chl=%24%20ds%5E2%3D%20dx%5E2%2Bdy%5E2%20%24). We could even represent this squared length in a lot more compact way, such as:\n  ![](https://chart.googleapis.com/chart?cht=tx&chl=%24%24ds%5E%7B2%7D%3D%5Csum_%7Bi%2Cj%3D1%7D%5E%7B2%7Dg_%7Bij%7Ddx%5E%7Bi%7Ddy%5E%7Bj%7D%24%24)\nwhere we have used the metric to describe the length, and in this case it is a 2x2 matrix, because we are in a two-dimensional space. Comparing both expressions, you can check that this matrix is the 2x2 identity matrix:\n\n  ![](https://chart.googleapis.com/chart?cht=tx&chl=%24%24%5Cleft%5Bg_%7Bij%7D%5Cright%5D%3D%5Cleft(%5Cbegin%7Barray%7D%7Bcc%7D%201%20%26%200%5C%5C%200%20%26%201%20%5Cend%7Barray%7D%5Cright)%24%24)\n\nLet us now go back to the Schwarzschild solution. As we now know, this solution is a spacetime metric, and it is written in the following form, in terms of the squared length,\n\n ![](https://chart.googleapis.com/chart?cht=tx&chl=%24%24ds%5E%7B2%7D%3D-%5Cleft(1-%5Cfrac%7B2M%7D%7Br%7D%5Cright)dt%5E%7B2%7D%2B%5Cleft(1-%5Cfrac%7B2M%7D%7Br%7D%5Cright)%5E%7B-1%7Ddr%5E%7B2%7D%2Br%5E%7B2%7Dd%5COmega%5E%7B2%7D%24%24)\n\nIn this expression, M is the mass of the spherical distribution of matter (the sun, for instance), and the metric is written in spherical coordinates, where r is the radial coordinate and  ![](https://chart.googleapis.com/chart?cht=tx&chl=%24d%5COmega%24) represents the element of solid angle  (the angular bit).\n\nWhat is interesting to observe in this solution is that the function which multiplies the term  ![](https://chart.googleapis.com/chart?cht=tx&chl=%24dr%5E2%24) becomes singular (the denominator vanishes) when  r=0 or when r=2M.  These singularities can be of great physical and mathematical importance, and in particular, in the Schwarzschild solution, the r=0 singularity is related to the existence of a blackhole solution (but this is something for another post). The singularity  r=2M  can be \"removed\", though, by using another coordinate system which extends the one initially adopted to describe the Schwarzschild metric. This extension is called the Kruskal extension, and it contains the Schwarzschild solution. \n\nIn order to represent these spacetimes (or solutions to the Einstein equations), one usually draws two-dimensional diagrams, where one ignores the angular part (due to symmetry). Thus, in the diagram in Kruskal coordinates below, each point has coordinats (T,X) and represents a two-dimensional sphere:\n\n\n![512px-Kruskal_diagram_of_Schwarzschild_chart.svg.png](https://steemitimages.com/DQmS5qwzDUhw9ZRtvPqF94NmnXEiLovV6w5F4AFyEiKJs8y/512px-Kruskal_diagram_of_Schwarzschild_chart.svg.png)\n[Source:Wikipedia]\n\nIn the figure, the curve r=0 in blue is the singularity we mentioned earlier, and all straight lines  at a 45 degree angle with the horizontal axis represent light beam trajectories. If we represent the spatial hypersurface T=0 (the X axis) as a two-dimensional surface embedded in three-dimensional flat space, it would have the shape\n\n![Lorentzian_Wormhole.svg.png](https://steemitimages.com/DQmdyQVZBN6B33aTsSzHG1ELLGPfWuFvBEJXJyf9MpK5wL9/Lorentzian_Wormhole.svg.png)\n[Source:Wikipedia]\n\nHere each circle is in fact a two-dimensional sphere (one coordinate is suppressed). The tunnel, or throat, connects the regions I and III of the Kruskal diagram, and it is called the Schwarzschild wormhole, or Einstein-Rosen bridge. \n\nThe lesson here is: are wormholes possible? Yes, if you accept that they are possible solutions of the Einstein field equations. However, there are complex issues to be considered, such as the stability of these structures, and if it is possible to traverse them in either direction. Have in mind that this is only a simple example, and there are complicated holes out there in scientific literature (see, for example, the references in <a name=\"footnote2\"><sup>2</sup></a>).\n\nAt last, if you have come this far, here goes a cute short film, \"Einstein-Rosen\":\n\nhttps://vimeo.com/250569840\n\n\n\nps: since there is no native LaTeX support,  I managed inserting equations  with this [workaround](https://helloacm.com/simple-method-to-insert-math-equations-in-steemit-markdown-editor/).\n\n<sup>[1](#footnote1)</sup>[Interstellar](http://www.imdb.com/title/tt0816692/). As a matter of fact, this movie had the theoretical physicist and Nobel prize winner Kip Thorne as scientific advisor.\n<sup>[2](#footnote2)</sup> [Wikipedia](https://en.wikipedia.org/wiki/Wormhole)",
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      "author": "fresneda",
      "body": "thanks!",
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      "body": "I guess if you made clearer what the two references frames are, it would be ok, even without mentioning the equivalence principle at that point. In any case, I enjoyed the approach, and it is funny that using only newtonian physics it is possible to arrive qualitatively at the same expression for the angle deviation for small masses.",
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      "body": "I think I'll make the bijection proof another post and then link to it from this article. I think that way it is least intrusive to anyone who is not interested, but there for the people who want to see it.\n\nNo promises, but I'll try to get it done by tomorrow.",
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      "body": "Not that I know of. I believe there was some discussion about steemit supporting mathjax or a simmilar JavaScript based latex compilation but it was dropped for now, as it's not trivial to do and they want to focus on core features first. Take a look at the [Steemit Condenser repo](https://github.com/steemit/condenser), maybe you can find something in the issues.",
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      "author": "thequantumknight",
      "body": "Thank You for your feedback! I hoped that it would have been more enjoyable to focus on this techniques role in supporting the concept.\n\nNevertheless, looking back I agree that I failed to do justice to the equivalence principle. After presenting the second half of the approximation techniques, I will happily dedicate an article to the topic!",
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      "body": "Thank You for your feedback! I hoped that it would have been more enjoyable to focus on this techniques role in supporting the equivalences principle's concept.\n\nNevertheless, looking back I agree that I failed to do justice to the equivalence principle in my article. After presenting the second half of the approximation techniques I have begun to discuss, I will happily dedicate an article to the topic!",
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      "author": "fresneda",
      "body": "Again, a very interesting read. I will be following you :)\nI think you will enjoy this [book](https://en.wikipedia.org/wiki/The_Emperor%27s_New_Mind) by Penrose.   Unfortunately, as far as I know, nobody has succeeded in proving that quantum mechanics is relevant to explain the functionality of any structure inside our bodies, especially with regard to our brain.  Quantum mechanics has achieved a singular status of being the most poorly known area of physics and the answer to all questions... I try to keep a conservative view.",
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      "author": "fresneda",
      "body": "Perhaps you could write a formal proof of the bijection,  on a side note, just so one can see how it would look like.  I think we must not fear losing readership by being a bit technical, especially since you did a great job giving an informal explanation.",
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      "body": "I have been struggling to insert latex myself. I used a google api to do it, but it is not very comfortable (see at the end of this [post](https://steemit.com/science/@fresneda/wormholes)).  I will try your method, but do you know if there is any frontend for the steem blockchain more appropriate to writing math?",
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      "author": "fresneda",
      "body": "Fascinating post! Thanks!",
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