Posty

Alcubierre drive

Alcubierre drive, more widely known as warp drive, is yet another scientific concept originating from Einstein’s theory of relativity. Its purpose would be to allow travel faster than light for any object equipped with such technology. Its name comes from scientist Miguel Alcubierre, who published a paper, explaining how such theoretical warp drive could work. It is well known that no known object is capable of travelling faster than the speed of light. This is bypassed by forming a warped bubble of space around the object, essentially forming a separate “universe”, in which travel faster than light is possible. The only problem is that in order to form this bubble you would need a large quantity of a material with negative mass, and all known matter has positive mass. Existence of such matter would violate more than one energy conditions, hence why even Alcubierre himself said that unless such matter is discovered and able to be artificially created, warp drive is highly unlikely to...
1 komentarz
Czytaj więcej

Quantum immortality

Quantum immortality theory comes from a thought experiment published in 1987 by Hans Moravec and in 1988 by Bruno Marchal. The experiment proposes the same setup as the famous Schrödinger’s Cat experiment, with the change that you are both the subject and the observer. In the Schr ö dinger’s experiment, after putting the cat in the box, it is in a state of superposition – both dead and alive at the same time. So, after being put and closed in a box, you two have to be in a superposition. Now we have to assume, that there are infinite universes, meaning that every possible world, past, present and future will always exist on a quantum level, with which the quantum physics generally agree. After running the experiment on time and letting some highly lethal gas or a radioactive material in the box, in an infinite amount of universes you will die, and in an infinite number of universes you will live. After rerunning the experiment the same happens – you die in an infinite number of uni...
1 komentarz
Czytaj więcej

Wormhole theory

Wormholes were first mentioned by Albert Einstein in his theory of general relativity, linking to the possible existence of white holes and them being direct exits of black holes, connecting to points in space. In 1935, Einstein and another physicist Nathan Rosen expanded on the idea, and proposed existence of “bridges” connecting two points through space-time, that could theoretically be used as shortcuts in space travel. These formations came to be called “wormholes”. They are theorized to have two spheroidal “mouths”, connected by a tunnel. According to the theory of general relativity, a wormhole’s mouth could be spotted by the way its gravity affects light passing near it, similarly to a black hole. Even if such a wormhole was discovered, travel through it would be a huge unknown, since primordially wormholes are theorized to have a size of around 10 -33 cm, though it is possible that with the universe constantly expanding they could increase in time. Second problem with trave...
1 komentarz
Czytaj więcej

White holes

White holes are theoretical opposites of black holes – they are places in space which cannot be physically entered by any object or matter in the universe, though energy, matter, light, and information can all escape it. They are a part of many theories, one of which is the theory of eternal black holes. The theory states that in a place where a white hole was in the past, there is a black hole in the future, though this is not true for black holes which have formed through gravitational collapse. Another theory states that white holes may be so-called “exits” of black holes, since any free-falling particle should be able to be falling infinitely, and this theory becomes untrue if the theoretical particle entered the singularity in a black hole, being infinitely compressed and unable to continue its movement. It is also theorized that each time a white hole eventually transforms into a black hole, a “Big Bang” occurs at the singularity, and a new, expanding universe is formed. Some sci...
1 komentarz
Czytaj więcej

False vacuum theory

The false vacuum theory originates from quantum field theory, in which a false vacuum is a vacuum that is in a stable state but isn’t permanently stable: it is metastable. This false vacuum could at any moment decay to a permanently stable vacuum. The false vacuum theory states that our universe is currently in the false vacuum, which may at any time revert to a stable state. This would cause the true vacuum to form and expand rapidly at a speed of light, which would prompt colossal changes to our universe: the laws of physics would be rewritten anew and the basic structure of matter would change completely. In 1980 another theory was proposed, stating that in a case of a true vacuum rapidly forming, our universe would simply revert to its state before the Big Bang, and simply be deleted, as if it never existed. Links: https://cosmosmagazine.com/science/physics/vacuum-decay-the-ultimate-catastrophe/
1 komentarz
Czytaj więcej

"The Dark Forest" theory

"The Dark Forest" theory comes from a 2008 science-fiction novel "The Dark Forest". The theory presents an answer to the Fermi paradox, which is a conflict between clear lack of evidence of extraterrestrial life, and various high estimates of existence of said life, primarily base on the Drake equation, which was used to estimate amount of other intelligent civilizations in the whole universe. The theory states, that the reason for why we haven’t yet met any other sentient forms of extraterrestrial life is because said civilizations are purposefully hiding their existence based on fear of complete annihilation from other forms of life and at the same time try to detect and eliminate other civilizations before they are detected and eliminated, based on a more advanced “kill or be killed” doctrine. Based on this theory, two possibilities are created – either we haven’t met any alien civilizations due to them concealing their existence, or there is a single civilizatio...
1 komentarz
Czytaj więcej

My blog topic

 This term, I will be researching and writing about most interesting and/or scary theories, mainly but not only concerning the whole universe and our existence.
Prześlij komentarz
Czytaj więcej