• Analytical Mellin-Barnes techniques with applications to two-loop SU(3) chiral perturbation theory and QED at higher loops 

      Ghosh, Shayan
      The present era is one of precision in particle physics. To account for the lacunae in the otherwise successful Standard Model, observables are calculated to high precision in various theoretical models, which are then ...
    • Applications of Holography 

      Bala Subramanian, P N
      This thesis consists of four parts. In the first part of the thesis, we investigate the phase structure of Einstein-Maxwell-Scalar system with a negative cosmological constant. For the conformally coupled scalar, an ...
    • Applications of Moonshine Symmetry in String Theory 

      Chattopadhyaya, Aradhita
      In this thesis we study the applications of Mathieu moonshine symmetry to compacti cations of supersymmetric string theories. These theories are compacti ed on a 6 dimensional manifold K3 T2. The main ingredient in ...
    • Aspects of conformal field theories at finite temperature 

      Dutta Chowdhury, Subham
      In this thesis we have studied broadly two aspects of thermal field theory. We began by examining how the macroscopic system (described by relativistic hydrodynamics) behalves in presence of microscopic anomalies. We ...
    • Aspects of Heavy Supersymmetry 

      Lamba, Priyanka
      The recent discovery of a Higgs boson with a mass around 125 GeV, taken together with experimental results from flavor factories, dark matter direct detection, and searches for SUSY particles in the LHC suggest that ...
    • Aspects of Higher Spin Theories Conformal Field Theories and Holography 

      Raju, Avinash (2018-05-30)
      This dissertation consist of three parts. The first part of the thesis is devoted to the study of gravity and higher spin gauge theories in 2+1 dimensions. We construct cosmological so-lutions of higher spin gravity in 2+1 ...
    • Aspects of Holography and Quantum complexity 

      Bhattacharjee, Budhaditya
      We begin with the Principle of holography and the AdS/CFT correspondence. We begin our investigations by considering the Principle of Holography, at the level of codimension-1 screens. We argue that the mechanism of encoding ...
    • Aspects of time dependence in quantum quenches 

      Khetrapal, Surbhi
      In this thesis we study the time dependence of correlators such as Green function, entanglement (Renyi) entropy and mutual information following quantum quench in Conformal Field Theories (CFTs) and their holographic duals ...
    • Asymptotic Analysis of Multi-scale, Multi-loop Feynman Diagrams 

      Sarkar, Ratan
      It is very challenging to solve multi-scale, multi-loop Feynman diagrams analytically. The presence of different kinematic scales makes the computation of Feynman diagrams very difficult, sometimes impossible to get the ...
    • Chiral Phase Transition Temperature in 3-flavor QCD 

      Sharma, Sipaz
      The nature of the chiral phase transition in QCD with three massless flavors of quarks remains unresolved despite being studied for nearly four decades. This Ph.D. thesis is a study using Lattice QCD to determine the ...
    • Complexity and Entanglement: From quantum gravity to many-body systems 

      Nandy, Pratik
      In recent years, complexity and entanglement have emerged as two fundamental computational measures and played a significant role in shaping our understanding of various phenomena, from the geometric nature of quantum ...
    • Conformal Bootstrap : Old and New 

      Kaviraj, Apratim (2018-05-25)
      Conformal Field Theories (CFT) are Quantum Field Theories characterized by enhanced (conformal) symmetries. They are interesting to Theoretical Physicists because they occur at critical points in phase transitions of various ...
    • Direct and Indirect Search for New Physics at Colliders 

      Lahiri, Jayita
      The Standard Model (SM) of particle physics has been remarkably successful to describe strong, weak and electromagnetic forces of nature, as it has agreed with most of the experiments till date. However, there are still ...
    • An Efficient Quantum Algorithm and Circuit to Generate Eigenstates Of SU(2) and SU(3) Representations 

      Sainadh, U Satya (2018-04-18)
      Many quantum computation algorithms, and processes like measurement based quantum computing, require the initial state of the quantum computer to be an eigenstate of a specific unitary operator. Here we study how quantum ...
    • Efficient Quantum Algorithms for Linear Algebra Problems 

      Priyadarsini, Anjali V
      Many simulation problems can be expressed as time evolution under specific interactions, from some simple initial state to a final state whose properties are to be investigated. In this context, the Hamiltonian evolution ...
    • Electronic Transport in Low-Dimensional Systems Quantum Dots, Quantum Wires And Topological Insulators 

      Soori, Abhiram (2018-04-05)
      This thesis presents the work done on electronic transport in various interacting and non-interacting systems in one and two dimensions. The systems under study are: an interacting quantum dot [1], a non-interacting quantum ...
    • Entanglement properties of gauge theories and the graviton. 

      Mukherjee, Jyotirmoy
      Entanglement entropy is emerging as a useful quantity to study critical phenomena in quantum systems, black holes physics, and holography. In this presentation, we discuss entanglement properties of gauge theories and ...
    • Explorations in Quantum Machine Learning 

      Khandelwal, Ankit
      Quantum Machine Learning is a rapidly developing field. In part 1 of this thesis, I benchmark common QML methods with the most popular datasets used in classical ML. I compare results from quantum and classical methods and ...
    • Explorations in the Space of S-Matrices 

      Haldar, Parthiv
      S-matrix is one of the fundamental observables of the quantum theory of relativistic particles. The quantum dynamics of relativistic particles can be abstractly understood in terms of S-matrix bypassing a Lagrangian ...
    • Exponential Resummation of QCD at Finite Chemical Potential 

      Mitra, Sabarnya
      A comprehensive study of the QCD phase diagram is one of the challenging and open problems in high energy physics. Having significant astrophysical implications, this is also important in constructing the chronological ...