Teaching Documents by Eli Morhayim
INVESTIGATION OF REHEATING AFTER COSMIC INFLATION, 2021
Stellar Streams, 2020
Galaxies across the universe are filled with many wonders and structures. One of these structures... more Galaxies across the universe are filled with many wonders and structures. One of these structures are called Stellar Streams and as the name suggests they are thin, long, and fragile streams of stars wrapped around galaxies like rings (a scientists liked to call them bracelets of galaxies). However, as we will see further on in this paper stellar streams are more than beautiful collections of stars around a galaxy. They are great fossils in galactic archaeology that can aid us in research regarding the evolution and formation of galaxies and also excellent experiments that can help us understand many mysteries of the universe such as dark matter. The Creation of Stellar Streams Tidal Forces: In order to understand how these streams of stars form around galaxies we first have to clearly understand the mechanics of gravitational tidal forces, the same concept that creates tides here on Earth. The general idea of tidal forces is basically a large amount of mass gravitationally pulling one side of an object more than the other causing its shape to change. It will logically pull the closer side of the object more as the force of gravity decreases with the square of the distance. We can observe this phenomenon on earth with ocean tides. The main component that determines the strength of tidal forces is the gradient of gravity rather than the strength. The bigger the difference of gravity between two sides of an object the stronger it will be affected by tidal forces. The figure on the right is a representation of this effect.
Drafts by Eli Morhayim
Einstein's Mirror Experiment: Underlying Theory and Practical Realisation at the Rutherford Appleton Laboratory, 2021
Einstein's Mirror Experiment is a famous thought experiment devised by Albert Einstein to illustr... more Einstein's Mirror Experiment is a famous thought experiment devised by Albert Einstein to illustrate the peculiarities of his theory of Special Relativity. The experiment shows the peculiarities of light reflection on a mirror moving at speeds close to the speed of light. The incident and the reflection angles are not equal, which challenges intuition. Moreover, the frequency of the light is changed as well as the duration of the pulse. Recently, this experiment has been realised at the Rutherford Appleton Laboratory (RAL) near Oxford, UK. This paper aims to show the theoretical background behind these phenomena as well as to comment on applications and limitations with respect to the experiment done at RAL. We present the equations giving the relations between the reflection and incident angles, the initial and final frequencies, and the initial and final pulse duration. It also talks about the fundamentals of the experimental setup at RAL and future applications such as microchip production, photon production and investigation of the Dynamical Casimir Effect.
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Teaching Documents by Eli Morhayim
Drafts by Eli Morhayim