Seminar 1: Determination of the error of measuring the direction of the extensive air showers in terms of the distance from the center of the array, energy, type of particle, Zenith angle, and azimuth angle using the CORSIKA simulation code

Javad Rahimi

Department of Physics, Sharif University of Technology

Seminar 2: Mass, Inertial Force and Mach Principle

Amirmohammad Zakeri

Department of Physics, Sharif University of Technology

 

Abstract 1: In this project, we explore how cosmic rays reach Earth. Rays that can have different origins such as stars, supernovae, black holes, active galactic nuclei, etc. In general, we divide these cosmic particles into three categories: 1- Nuclei (proton, carbon, iron, etc.), 2- Neutrinos, 3- Photons, which have different production mechanisms and interactions with their surroundings. After reaching the earth’s atmosphere, these particles make the first interaction with atmospheric atoms, which leads to the production of secondary particles. Secondary particles also continuously increase in number in successive collisions with atmospheric atoms, resulting in an extensive air shower that propagates in the atmosphere like a wave with a specific wave front to reach the ground. The earth’s surface can also be covered by the use of detectors that are located in different arrays, both in terms of geometric shape and in terms of covered area, to determine the direction, energy and type of the primary particle. The measurement of the direction of an extensive air shower is significant because it can be used to estimate the direction of the primary particle. The measurement of such a direction depends on the number of detectors and the geometry of the arrays. The method of calculating the direction of the incidence particle is that the arrays determine the arrival time of the particles, and the initial direction of the incidence particle can be measured from the time difference between different detectors. Therefore, if we can have a proper estimate of the direction measurement error, we can determine accurately of the primary particle direction. This will enable us to determine the direction of the cosmic origin of the particle. In this project, we want to use the CORSIKA simulation code to determine the dependence of the input particle direction measurement error on the distance from the center of the array, zenith angle, energy. and the type of primary particle.

 

Abstract 2: Particle physics ، ever since began to discover particles and put them in particle zoo, has been responsible for defining mass and describing a becoming-massive mechanism for every particle; but, is that really the one and only option to answer ‘what is mass?’.

In this talk, I’m going to introduce a cosmological interpretation of mass under the hood of Mach Principle, which has inspired C.Brans and R.H.Dicke in their famous modified gravity theory, Brans-Dicke theory. I’m going to show that mass, is pretty entangled with inertial force, the force that classical physics permitted to be fictitious and not real.

یکشنبه 21 اسفند 1401، ساعت 17:30

Sunday 12 March 2023 – 17:30 Tehran Time

سمینار به صورت هیبریدی (حضوری و مجازی) برگزار می شود

Hybrid Seminar

آمفی تئاتر دانشکده فیزیک-تالار جنابPhysics Department – Amphitheater- Jenab Hall/

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest