Bulletin of the American Physical Society
Spring 2018 Meeting of the APS New England Section
Volume 63, Number 9
Friday–Saturday, March 16–17, 2018; Boston, Massachusetts
Session D01: General Physics |
Hide Abstracts |
Room: 20 Somerset 214 |
Saturday, March 17, 2018 10:15AM - 10:27AM |
D01.00001: The Physics of Living in Space Charles Holbrow I will outline a short course in physics that uses living in space as a context for understanding Newton's laws of motion. With these and his Law of Universal Gravitation students can understand rocketry, orbits, interplanetary travel, the creation of large orbiting space habitats, and how to produce pseudogravity in them. The course is offered as part of the public outreach of the school system of Lexington, MA. I will show a way to inroduce Newton's laws in terms of momentum and its time-rate-of-change that avoids the apparent circularity of many treatments of dynamics. [Preview Abstract] |
Saturday, March 17, 2018 10:27AM - 10:39AM |
D01.00002: Quaternion Baseball Douglas Sweetser Spring training has begun. Physicists are prone to think of America's past time in terms of number theory. The trajectory of a hit to right-field is the position $R$ as a function of time $t$, or $R(t)$. A complete description would keep both values available, namely $(t, R(t))$. This requires four numbers, perfect for quaternions. Time is the real number, while 3D space has three different imaginary numbers. Our language shifts to respect space-time. The hit goes from home plate-now to right field-future. A spatial reflection of the hit using a huge mirror would have the ball travel to left field-future. This requires the same amount of time but twice the distance is covered. A reflection in time takes the ball from right field-past to home plate-now before traveling back, needing the same amount of space but twice the time. Reflect both space and time, and the ball starts in left field-past, goes through home plate-now, and continues to right field-future. For the complex plane, the reflection around the real axis is visual indistinguishable from one around the imaginary axis. To a space-time physicist, the two are easy to tell apart: mirrors have 2 items while one must use memory to spot time reflections. One can draw in space but can only animate in time. [Preview Abstract] |
Saturday, March 17, 2018 10:39AM - 10:51AM |
D01.00003: Hawking Radiation: A Violation of the Zeroth Law of Thermodynamics. Pierre-Marie Robitaille According to modern theory, Hawking Radiation can be emitted from a non-rotating, non-charged Schwarzschild black hole. This radiation is thought to be a manifestation of a real thermodynamic process. The resulting temperature has always been viewed as a physical temperature in accordance with the zeroth law. However, it is readily apparent that the concept of a Hawking Temperature violates the zeroth law of thermodynamics. Hawking Radiation is said to correspond to a blackbody spectrum at a temperature, T$_{\mathrm{H}}=\hbar $c$^{\mathrm{3}}$/(8$\pi $GMk$_{\mathrm{B}})$, where $\hbar $, c, $\pi $, G, and k$_{\mathrm{B}}$ are well-known constants and M corresponds to the mass of the black hole. However, temperature is an intensive property. It cannot be made to depend on the mass of a system, an extensive property, without an associated extensive property, like volume, which in combination with M leads to an intensive property. If the left side of an equation is intensive in thermodynamics, then the right side must also be intensive. The equation for Hawking Temperature violates this rule. Furthermore, the production of a blackbody spectrum absolutely depends on the presence of a physical lattice as is well-known throughout metrology. The idea that such a spectrum can be generated from thermal equilibrium considerations alone is false.$^{\mathrm{1}}$ The point is made by considering perfectly reflecting cavities which are unable to emit any photons. As a result, black holes cannot be reconciled with the known laws of thermodynamics and Hawking Radiation does not exist. $^{\mathrm{1}}$Robitaille P.-M., IEEE Trans. Plasma Sci., 2003, v. 31(6), 1263-1267. [Preview Abstract] |
Saturday, March 17, 2018 10:51AM - 11:03AM |
D01.00004: Complementarity explained by a rogue theory, promoted by a psychiatrist who is an APS member Jeffrey Boyd Complementarity can be explained by a rogue theory: Elementary Wave theory, which says particles follow zero energy waves backwards. Suspend your disbelief for a moment. In the double slit experiment waves emanate from every point of the target screen. The waves through the upper and lower slit interfere in proximity to the particle gun. If A is the amplitude at the gun of a wave through slit A, B is the amplitude of a wave through slit B, then the probability of a particle being triggered in response to an incident wave is proportional to (A $+$ B) squared. The particle would follow that wave backwards with a probability of one and make a dot on the target screen at that location from which the wave originated. The target screen shows us a map of the interference located near the particle gun. If a detector is introduced, it emits a tiny amount of energy, which in turn changes the elementary wave so it is incapable of interacting with its mate: the wave through the other slit. There is no further constructive or destructive interference. They are two independent waves. The screen now shows us no interference near the gun. [Preview Abstract] |
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