Relativistic Magnetohydrodynamics of a Spinful and Vortical Fluid: Entropy Current Analysis and Transport Coefficients

, M.Sc. Thesis Sharif University of Technology Seⅾighi Jafari, Ⅿahⅾi (Author) ; Sadooghi, Neda (Supervisor) ; Kiamari, Motahareh (Co-Supervisor)

Abstract

Fluid Mechanics can be considered as an effective method for studying many-body effects in classical and quantum systems. In recent years, relativistic hydrodynamics has found different applications in different branches of physics. One of these applications is the quantitative description of the experimental behavior of relativistic heavy-ion collisions. More specifically, studying fluid mechanics in the presence of magnetic fields (magnetohydrodynamics) and vorticity is of great importance in heavy-ion collision experiments. In this framework, on the one hand, the interaction between spin and magnetic field, and on the other hand, the interaction between spin and angular momentum of the...

Coordinated Multi-Points (CoMP) Transmission in Multiuser Relay Networks

, M.Sc. Thesis Sharif University of Technology Kiamari, Mehrdad (Author) ; Hossein Khalaj, Babak (Supervisor)

Abstract

Joint multi-input multi-output (MIMO) ﬁlter-and-forward relaying and post-processing at base stations (BSs) for uplink coordinated multi-point (CoMP) reception has been investigated in the case of users-to-relay and relay-to-BSs frequency-selective fading channels. Signal transmission from users to BSs is performed in two phases. In the ﬁrst phase, all users transmit their data to MIMO relay at the same time slot. In order to combat the interference due to frequency-selectivity of channels, MIMO relay passes its received signals through a ﬁnite impulse response (FIR) ﬁlter. Then, in the second phase, relay transmits the processed signals to the BSs. In order to further reducemean square...

Joint MIMO filter-and-forward relay and base station post-processing for uplink CoMP reception with frequency-selective channels

, Article IEEE Vehicular Technology Conference, Dresden ; 2013 ; 15502252 (ISSN); 9781467363372 (ISBN) Kiamari, M ; Pilaram, H ; Khalaj, B. H ; Sharif University of Technology

2013

Abstract

In this paper, we study the sum mean square error (SMSE) performance of all users by applying joint MIMO filter-and-forward relay and post-processing at base stations (BSs) for uplink coordinated multi-point (CoMP) reception in case of users-to-relay and relay-to-BSs frequency-selective fading channels. In order to combat the interference due to frequency-selectivity of channels, MIMO relay passes its received signals through a finite impulse response (FIR) filter. For further reducing SMSE, each BS applies a post-processing to its received signals. The goal is minimizing the SMSE subject to transmitted power constraint of MIMO relay. An iterative algorithm is proposed to jointly optimize...

Anomalous hall instability in the chern-simons magnetohydrodynamics

, Article Physical Review D ; Volume 104, Issue 7 , 2021 ; 24700010 (ISSN) Kiamari, M ; Rahbardar, M ; Shokri, M ; Sadooghi, N ; Sharif University of Technology

American Physical Society 2021

Abstract

The Chern-Simons magnetohydrodynamics (CSMHD) is introduced using a Maxwell-Chern-Simons (MCS) Lagrangian including an axionlike field . The MCS equation of motion derived from this Lagrangian consists of a modified current, including a chiral magnetic (CM) and an anomalous Hall (AH) current, in addition to the ordinary Ohm current of resistive magnetohydrodynamics (MHD). The former consists of an axial chemical potential, which is given in terms of the temporal comoving derivative of , and the latter arises from the spatial gradient of . As it turns out, the existence of the axial chemical potential is a nonequilibrium effect that plays no role in the linear stability analysis, whereas the...