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| Ultimi commenti - Deep Sky Objects |
NGC-2392.jpgNGC 2392 - The "Eskimo Nebula" (HST)86 visite"...Tempora sic fugiunt pariter, pariterque sequuntur et nova sunt semper..."
(Ovidio)
"...Così, in un omogeneo e coerente fluire, si fuggono i giorni e, in egual modo, altri ne giungono: e, tutti, sono (pur) sempre (giorni) nuovi..."01/28/22 at 17:56Paolo C. Fienga: Dedicata a Walt.
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Tachyons-2.gifHow to contact "Them"? Tachyon Signal (2)214 visite"Causality" is a fundamental Principle of Physics. If Tachyons can transmit information faster than Light then, according to General Relativity, they should violate the Law of Causality, leading to logical Paradoxes of the "kill your own grandfather" type. This is often illustrated with thought experiments such as the "Tachyon Telephone Paradox" or "Logically Pernicious self-Inhibitor."
The problem can be understood (note: really?) in terms of the Relativity of simultaneity in the Special Relativity Theory, which says that different "inertial reference frames" will disagree on whether two events at different locations happened "at the same time" or not, and they can also disagree on the order of the two events (technically, these disagreements occur when the spacetime interval between the events is "space-like", meaning that neither event lies in the future Light Cone of the other). If one of the two events represents the sending of a signal from one location and the second event represents the reception of the same signal at another location, then as long as the signal is moving at the Speed of lLght or slower, the Mathematics of Simultaneity ensures that all reference frames agree that the transmission-event happened before the reception-event.
However, in the case of a hypothetical signal moving faster than light, there would always be some frames in which the signal was received BEFORE it was sent, so that the signal could be said to have moved backward in time.
Because one of the two fundamental postulates of Special Relativity says that the Laws of Physics should work the same way in every Inertial Frame, if it is possible for signals to move backward in time in any one frame, it must be possible (that they move backward) in all frames. This means that if observer "A" sends a signal to observer "B" which moves faster than light in "A'"s frame but backwards in time in "B'"s frame, and then "B" sends a reply which moves faster than light in "B"'s frame but backwards in time in "A"'s frame, it could work out that "A" receives the reply before sending the original signal, challenging Causality in every frame and opening the door to severe Logical Paradoxes.MareKromium01/16/22 at 11:07Paolo C. Fienga: Probabilmente hai ragione tu. Ma, alla lunga, lavo...
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Tachyons-2.gifHow to contact "Them"? Tachyon Signal (2)214 visite"Causality" is a fundamental Principle of Physics. If Tachyons can transmit information faster than Light then, according to General Relativity, they should violate the Law of Causality, leading to logical Paradoxes of the "kill your own grandfather" type. This is often illustrated with thought experiments such as the "Tachyon Telephone Paradox" or "Logically Pernicious self-Inhibitor."
The problem can be understood (note: really?) in terms of the Relativity of simultaneity in the Special Relativity Theory, which says that different "inertial reference frames" will disagree on whether two events at different locations happened "at the same time" or not, and they can also disagree on the order of the two events (technically, these disagreements occur when the spacetime interval between the events is "space-like", meaning that neither event lies in the future Light Cone of the other). If one of the two events represents the sending of a signal from one location and the second event represents the reception of the same signal at another location, then as long as the signal is moving at the Speed of lLght or slower, the Mathematics of Simultaneity ensures that all reference frames agree that the transmission-event happened before the reception-event.
However, in the case of a hypothetical signal moving faster than light, there would always be some frames in which the signal was received BEFORE it was sent, so that the signal could be said to have moved backward in time.
Because one of the two fundamental postulates of Special Relativity says that the Laws of Physics should work the same way in every Inertial Frame, if it is possible for signals to move backward in time in any one frame, it must be possible (that they move backward) in all frames. This means that if observer "A" sends a signal to observer "B" which moves faster than light in "A'"s frame but backwards in time in "B'"s frame, and then "B" sends a reply which moves faster than light in "B"'s frame but backwards in time in "A"'s frame, it could work out that "A" receives the reply before sending the original signal, challenging Causality in every frame and opening the door to severe Logical Paradoxes.MareKromium01/14/22 at 15:13Anakin: La nicchia potr? anche essere il passaporto per l&...
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Tachyons-2.gifHow to contact "Them"? Tachyon Signal (2)214 visite"Causality" is a fundamental Principle of Physics. If Tachyons can transmit information faster than Light then, according to General Relativity, they should violate the Law of Causality, leading to logical Paradoxes of the "kill your own grandfather" type. This is often illustrated with thought experiments such as the "Tachyon Telephone Paradox" or "Logically Pernicious self-Inhibitor."
The problem can be understood (note: really?) in terms of the Relativity of simultaneity in the Special Relativity Theory, which says that different "inertial reference frames" will disagree on whether two events at different locations happened "at the same time" or not, and they can also disagree on the order of the two events (technically, these disagreements occur when the spacetime interval between the events is "space-like", meaning that neither event lies in the future Light Cone of the other). If one of the two events represents the sending of a signal from one location and the second event represents the reception of the same signal at another location, then as long as the signal is moving at the Speed of lLght or slower, the Mathematics of Simultaneity ensures that all reference frames agree that the transmission-event happened before the reception-event.
However, in the case of a hypothetical signal moving faster than light, there would always be some frames in which the signal was received BEFORE it was sent, so that the signal could be said to have moved backward in time.
Because one of the two fundamental postulates of Special Relativity says that the Laws of Physics should work the same way in every Inertial Frame, if it is possible for signals to move backward in time in any one frame, it must be possible (that they move backward) in all frames. This means that if observer "A" sends a signal to observer "B" which moves faster than light in "A'"s frame but backwards in time in "B'"s frame, and then "B" sends a reply which moves faster than light in "B"'s frame but backwards in time in "A"'s frame, it could work out that "A" receives the reply before sending the original signal, challenging Causality in every frame and opening the door to severe Logical Paradoxes.MareKromium01/12/22 at 17:47Paolo C. Fienga: Si Anakin. Quegli "altri" con i quali, s...
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Tachyons-2.gifHow to contact "Them"? Tachyon Signal (2)214 visite"Causality" is a fundamental Principle of Physics. If Tachyons can transmit information faster than Light then, according to General Relativity, they should violate the Law of Causality, leading to logical Paradoxes of the "kill your own grandfather" type. This is often illustrated with thought experiments such as the "Tachyon Telephone Paradox" or "Logically Pernicious self-Inhibitor."
The problem can be understood (note: really?) in terms of the Relativity of simultaneity in the Special Relativity Theory, which says that different "inertial reference frames" will disagree on whether two events at different locations happened "at the same time" or not, and they can also disagree on the order of the two events (technically, these disagreements occur when the spacetime interval between the events is "space-like", meaning that neither event lies in the future Light Cone of the other). If one of the two events represents the sending of a signal from one location and the second event represents the reception of the same signal at another location, then as long as the signal is moving at the Speed of lLght or slower, the Mathematics of Simultaneity ensures that all reference frames agree that the transmission-event happened before the reception-event.
However, in the case of a hypothetical signal moving faster than light, there would always be some frames in which the signal was received BEFORE it was sent, so that the signal could be said to have moved backward in time.
Because one of the two fundamental postulates of Special Relativity says that the Laws of Physics should work the same way in every Inertial Frame, if it is possible for signals to move backward in time in any one frame, it must be possible (that they move backward) in all frames. This means that if observer "A" sends a signal to observer "B" which moves faster than light in "A'"s frame but backwards in time in "B'"s frame, and then "B" sends a reply which moves faster than light in "B"'s frame but backwards in time in "A"'s frame, it could work out that "A" receives the reply before sending the original signal, challenging Causality in every frame and opening the door to severe Logical Paradoxes.MareKromium01/08/22 at 18:51Anakin: Noi siamo di nicchia Paolo, oltre ogni ragionevole...
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Tachyons-2.gifHow to contact "Them"? Tachyon Signal (2)214 visite"Causality" is a fundamental Principle of Physics. If Tachyons can transmit information faster than Light then, according to General Relativity, they should violate the Law of Causality, leading to logical Paradoxes of the "kill your own grandfather" type. This is often illustrated with thought experiments such as the "Tachyon Telephone Paradox" or "Logically Pernicious self-Inhibitor."
The problem can be understood (note: really?) in terms of the Relativity of simultaneity in the Special Relativity Theory, which says that different "inertial reference frames" will disagree on whether two events at different locations happened "at the same time" or not, and they can also disagree on the order of the two events (technically, these disagreements occur when the spacetime interval between the events is "space-like", meaning that neither event lies in the future Light Cone of the other). If one of the two events represents the sending of a signal from one location and the second event represents the reception of the same signal at another location, then as long as the signal is moving at the Speed of lLght or slower, the Mathematics of Simultaneity ensures that all reference frames agree that the transmission-event happened before the reception-event.
However, in the case of a hypothetical signal moving faster than light, there would always be some frames in which the signal was received BEFORE it was sent, so that the signal could be said to have moved backward in time.
Because one of the two fundamental postulates of Special Relativity says that the Laws of Physics should work the same way in every Inertial Frame, if it is possible for signals to move backward in time in any one frame, it must be possible (that they move backward) in all frames. This means that if observer "A" sends a signal to observer "B" which moves faster than light in "A'"s frame but backwards in time in "B'"s frame, and then "B" sends a reply which moves faster than light in "B"'s frame but backwards in time in "A"'s frame, it could work out that "A" receives the reply before sending the original signal, challenging Causality in every frame and opening the door to severe Logical Paradoxes.MareKromium12/25/21 at 20:58Paolo C. Fienga: E' bello immaginarti mentre ridi Amico Mio! Ci...
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Tachyons-2.gifHow to contact "Them"? Tachyon Signal (2)214 visite"Causality" is a fundamental Principle of Physics. If Tachyons can transmit information faster than Light then, according to General Relativity, they should violate the Law of Causality, leading to logical Paradoxes of the "kill your own grandfather" type. This is often illustrated with thought experiments such as the "Tachyon Telephone Paradox" or "Logically Pernicious self-Inhibitor."
The problem can be understood (note: really?) in terms of the Relativity of simultaneity in the Special Relativity Theory, which says that different "inertial reference frames" will disagree on whether two events at different locations happened "at the same time" or not, and they can also disagree on the order of the two events (technically, these disagreements occur when the spacetime interval between the events is "space-like", meaning that neither event lies in the future Light Cone of the other). If one of the two events represents the sending of a signal from one location and the second event represents the reception of the same signal at another location, then as long as the signal is moving at the Speed of lLght or slower, the Mathematics of Simultaneity ensures that all reference frames agree that the transmission-event happened before the reception-event.
However, in the case of a hypothetical signal moving faster than light, there would always be some frames in which the signal was received BEFORE it was sent, so that the signal could be said to have moved backward in time.
Because one of the two fundamental postulates of Special Relativity says that the Laws of Physics should work the same way in every Inertial Frame, if it is possible for signals to move backward in time in any one frame, it must be possible (that they move backward) in all frames. This means that if observer "A" sends a signal to observer "B" which moves faster than light in "A'"s frame but backwards in time in "B'"s frame, and then "B" sends a reply which moves faster than light in "B"'s frame but backwards in time in "A"'s frame, it could work out that "A" receives the reply before sending the original signal, challenging Causality in every frame and opening the door to severe Logical Paradoxes.MareKromium12/25/21 at 16:19Anakin: non so perch? ma questa tua considerazione sul &qu...
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Tachyons-2.gifHow to contact "Them"? Tachyon Signal (2)214 visite"Causality" is a fundamental Principle of Physics. If Tachyons can transmit information faster than Light then, according to General Relativity, they should violate the Law of Causality, leading to logical Paradoxes of the "kill your own grandfather" type. This is often illustrated with thought experiments such as the "Tachyon Telephone Paradox" or "Logically Pernicious self-Inhibitor."
The problem can be understood (note: really?) in terms of the Relativity of simultaneity in the Special Relativity Theory, which says that different "inertial reference frames" will disagree on whether two events at different locations happened "at the same time" or not, and they can also disagree on the order of the two events (technically, these disagreements occur when the spacetime interval between the events is "space-like", meaning that neither event lies in the future Light Cone of the other). If one of the two events represents the sending of a signal from one location and the second event represents the reception of the same signal at another location, then as long as the signal is moving at the Speed of lLght or slower, the Mathematics of Simultaneity ensures that all reference frames agree that the transmission-event happened before the reception-event.
However, in the case of a hypothetical signal moving faster than light, there would always be some frames in which the signal was received BEFORE it was sent, so that the signal could be said to have moved backward in time.
Because one of the two fundamental postulates of Special Relativity says that the Laws of Physics should work the same way in every Inertial Frame, if it is possible for signals to move backward in time in any one frame, it must be possible (that they move backward) in all frames. This means that if observer "A" sends a signal to observer "B" which moves faster than light in "A'"s frame but backwards in time in "B'"s frame, and then "B" sends a reply which moves faster than light in "B"'s frame but backwards in time in "A"'s frame, it could work out that "A" receives the reply before sending the original signal, challenging Causality in every frame and opening the door to severe Logical Paradoxes.MareKromium12/24/21 at 18:30Paolo C. Fienga: ...Si, li ha "costretti" venire allo sco...
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Tachyons-2.gifHow to contact "Them"? Tachyon Signal (2)214 visite"Causality" is a fundamental Principle of Physics. If Tachyons can transmit information faster than Light then, according to General Relativity, they should violate the Law of Causality, leading to logical Paradoxes of the "kill your own grandfather" type. This is often illustrated with thought experiments such as the "Tachyon Telephone Paradox" or "Logically Pernicious self-Inhibitor."
The problem can be understood (note: really?) in terms of the Relativity of simultaneity in the Special Relativity Theory, which says that different "inertial reference frames" will disagree on whether two events at different locations happened "at the same time" or not, and they can also disagree on the order of the two events (technically, these disagreements occur when the spacetime interval between the events is "space-like", meaning that neither event lies in the future Light Cone of the other). If one of the two events represents the sending of a signal from one location and the second event represents the reception of the same signal at another location, then as long as the signal is moving at the Speed of lLght or slower, the Mathematics of Simultaneity ensures that all reference frames agree that the transmission-event happened before the reception-event.
However, in the case of a hypothetical signal moving faster than light, there would always be some frames in which the signal was received BEFORE it was sent, so that the signal could be said to have moved backward in time.
Because one of the two fundamental postulates of Special Relativity says that the Laws of Physics should work the same way in every Inertial Frame, if it is possible for signals to move backward in time in any one frame, it must be possible (that they move backward) in all frames. This means that if observer "A" sends a signal to observer "B" which moves faster than light in "A'"s frame but backwards in time in "B'"s frame, and then "B" sends a reply which moves faster than light in "B"'s frame but backwards in time in "A"'s frame, it could work out that "A" receives the reply before sending the original signal, challenging Causality in every frame and opening the door to severe Logical Paradoxes.MareKromium12/24/21 at 13:13Anakin: Il linguaggio crudo ci sta. E anche secondo me l&#...
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NGC-3310.jpgNGC 3310 - Spiral Galaxy (HST)116 visite"...E' Dio che dovrebbe sedere sul Banco degli Imputati.
Lui, l'Altissimo, che siede dinanzi agli storpi, ai ciechi, agli infelici, ai malati senza speranza, agli sventurati che hanno perso ogni cosa, ai Martiri dell'odio razziale, della violenza e del rancore...
E' Dio che dovrebbe essere messo a giudizio, davanti ad una Giuria composta dai Suoi "figli non prediletti" e dalle Sue "pecore senza pascolo".
Una Giuria composta, ahimè, dalle Sue vittime...
(dal film "The Medusa Touch")12/13/21 at 20:16Paolo C. Fienga: Frase bellissima e controversa. Comunque, oltre le...
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Tachyons-1.jpgHow to contact "Them"? Tachyon Signal (1)123 visiteA Tachyon (or Tachyonic Particle) is a (not very much) hypothetical Particle that always travels faster than Light. Most physicists believe that faster-than-Light Particles cannot exist because they are not consistent with the known (note: so far "known"!) Laws of Physics. If such Particles did exist, and could send signals faster than light, then according to the Theory (note: "Theory"...) of Relativity, they would violate Causality, leading to logical paradoxes, like the "Grandfather Paradox!. Tachyons would also exhibit the unusual property of increasing in speed as their energy decreases, and would require infinite energy to slow down to the speed of Light. No experimental evidence for the existence of such Particles has been found. (note: false!)
In the 1967 paper that coined the term, Gerald Feinberg proposed that Tachyonic Particles could be made from excitations of a Quantum Field with imaginary mass. However, it was soon realized that Feinberg's model did not in fact allow for Superluminal (faster-than-light) speeds. Nevertheless, in modern Physics, the term Tachyon often refers to "imaginary" Mass fields rather than to "faster-than-light Particles".
Such (imaginary...) Fields have come to play a significant role in modern Physics.
The term comes from the Greek, where "tachy" means "fast". The complementary Particle types are called Luxons (which always move at the speed of light) and Bradyons (which always move slower than light); both of these Particle types are known to exist.MareKromium12/13/21 at 17:26MareKromium: Certo che ci pensiamo noi, Amico Mio! Anzi, se ave...
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Tachyons-1.jpgHow to contact "Them"? Tachyon Signal (1)123 visiteA Tachyon (or Tachyonic Particle) is a (not very much) hypothetical Particle that always travels faster than Light. Most physicists believe that faster-than-Light Particles cannot exist because they are not consistent with the known (note: so far "known"!) Laws of Physics. If such Particles did exist, and could send signals faster than light, then according to the Theory (note: "Theory"...) of Relativity, they would violate Causality, leading to logical paradoxes, like the "Grandfather Paradox!. Tachyons would also exhibit the unusual property of increasing in speed as their energy decreases, and would require infinite energy to slow down to the speed of Light. No experimental evidence for the existence of such Particles has been found. (note: false!)
In the 1967 paper that coined the term, Gerald Feinberg proposed that Tachyonic Particles could be made from excitations of a Quantum Field with imaginary mass. However, it was soon realized that Feinberg's model did not in fact allow for Superluminal (faster-than-light) speeds. Nevertheless, in modern Physics, the term Tachyon often refers to "imaginary" Mass fields rather than to "faster-than-light Particles".
Such (imaginary...) Fields have come to play a significant role in modern Physics.
The term comes from the Greek, where "tachy" means "fast". The complementary Particle types are called Luxons (which always move at the speed of light) and Bradyons (which always move slower than light); both of these Particle types are known to exist.MareKromium12/13/21 at 08:17Ufologo: Ah pu? essere! In effetti hanno chiuso praticament...
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