Presentations & Talks

You can find the list of my formal and informal talks below:

  1. Statistical Physics and Network Theory”                                                      Fall 2012  Department of Physics, University of Tehran.                                                             – In this presentation, I reviewed developments in the field of statistical mechanics of networks, including the small-world effect, degree distributions, clustering, network correlations, phase transitions, random graph models, models of network growth and preferential attachment, and dynamical processes taking place on networks.
  2. Large Extra Dimensions and Grand Unification at the Electroweak Scales”  Fall 2014 Department of Physics & Astronomy, Stony Brook University.                                    – In this presentation, I briefly reviewed the “Kaluza-Klien (KK) Theory” and the “Localization on topological defects” paradigm which can pave the way for understanding the Large Extra Dimensions (LED) paradigm. Then, I reviewed the simplest LED theory – that of Arkani-Hamed, Dimopoulos, and Dvali (ADD) – and attempted to explain some phenomena, including the hierarchy of scales and proton stability using this theory. Finally, in the third part of my talk, I briefly discussed other LED scenarios and recent experimental efforts in LHC and IceCube to search for the large extra dimensions.
  3. Gödel’s Incompleteness Theorem”                                                             Fall 2014  Stony Brook University.                                                                                             – In this informal talk, I started with introducing the Gödel’s incompleteness theorem and some early considerations of physical and mathematical impossibility as preludes to Gödel’s incompleteness theorems. I considered some informal aspects of these theorems and their underlying assumptions and discussed some of the responses to these theorems by those seeking to draw conclusions from them about the completability of theories of physics. I argued that there is no reason to expect the Gödel incompleteness theorem to handicap the search for a description of the laws of Nature, but we do expect it to limit what we can predict about the outcomes of those laws, and examples are given.
  4. Detecting Entanglement Among Many Particles”                                    Spring 2015 Department of Physics & Astronomy, Stony Brook University.                                    – Entanglement of multipartite systems is desired for precision interferometry, quantum computing, and fundamental tests of quantum mechanics. In a system of only a few particles, physicists can evaluate the entanglement by mapping out all particle correlations. However, the number of measurements needed for this so-called quantum tomography grows exponentially with the number of particles. Researchers have formulated other entanglement measures, but they only apply to specific types of multipartite entangled states. In this talk, I explained a new criterion introduced by Lüke et. al. Their method involves measuring the sum of all the individual spins in a large ensemble of particles, and then, evaluating its fluctuations. Compared to previous work, the criterion that Lüke and colleagues use is sensitive to a wider range of entangled states.
  5. Sommerfeld Enhancement in the Dark Matter Pair Annihilation”             Spring 2015  Department of Physics & Astronomy, Stony Brook University.                                   – In this talk, I started with giving a review of the results of observations by ATIC and PAMELA and how their observations are compatible with a WIMP with 500-800 GeV mass. Then I talked about Arkani-Hamed’s  Sommerfeld Enhancement in the Dark Matter Pair Annihilation model and how it can explain the results of the observations.

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