• 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 ...
    • Flavor and Dark Matter Issues in Supersymmetric Models 

      Chowdhury, Debtosh (2018-04-06)
      The Standard Model of particle physics attempts to unify the fundamental forces in the Universe (except gravity). Over the years it has been tested in numerous experiments. While these experimental results strengthen our ...
    • Heavy flavour and direct photon probes of the gluon Sivers function 

      Kaushik, Abhiram B
      Traditionally the production of heavy quarkonia, heavy-flavour mesons as well as of direct photons, has been used to constrain the gluon density inside the proton. In this thesis, I have assessed various heavy flavour ...
    • The Higgs Boson as a Probe of Physics Beyond the Standard Model at the Large Hadron Collider 

      Mohan, Kirtimaan A (2018-05-08)
      The nature of interactions of fundamental particles is governed by symmetries. These interactions are well described by an elegant and simple SU(3)c x SU(2)L x U(1)Y symmetric gauge theory that we call the Standard Model ...
    • Higgs phenomenology and Dark Matter prospects in MSSM, NMSSM and U(1) extended SM 

      Barman, Rahool Kumar
      Particle physics today is at a juncture where all particles predicted within Standard Model (SM) have been discovered at the particle colliders while no particles from the realm of physics beyond the Standard Model (BSM) ...
    • Higher Spins, Entanglement Entropy And Holography 

      Datta, Shouvik (2017-08-21)
      The idea of holography [1, 2] finds a concrete realization in form of the AdS/CFT correspondence [3, 4]. This duality relates a field theory with conformal symmetries to quantum gravity living in one higher dimension. In ...
    • Issues in Phenomenology of Heavy Quarks And Leptons 

      Arunprasath, V (2017-09-26)
      The Standard Model (SM) of the particle physics, based on the gauge group SU(3) ×SU(2)L × U(1)Y , has been a successful theory which provides consistent description of all phenomena ranging from the nuclear beta decay to ...
    • Lessons for Conformal Field Theories from Bootstrap and Holography 

      Sen, Kallo (2018-02-06)
      The work done in this thesis includes an exploration of both the conformal field theory techniques and holographic techniques of the Gauge/Gravity duality. From the field theory, we have analyzed the analytical aspects of ...
    • Lessons for Gravity from Entanglement 

      Bhattacharyya, Arpan
      One of the recent fundamental developments in theoretical high energy physics is the AdS/CFT correspondence [1, 2, 3, 4] which posits a relationship between Quantum Field Theories (QFT) in a given dimension and String ...
    • Living on the Edge A Study of Boundary Modes In Two-dimensional Topological Systems 

      Seshadri, Ranjani
      In the last few decades an enormous amount of research has been carried out on some novel phases of matter called topological phases which are beyond the paradigm of Landau’s theory of symmetry breaking. One of the ...
    • Mesonic screening mass at zero and finite chemical potential 

      Thakkar, Rishabh
      The finite temperature analysis of QCD is challenging since perturbation theory is not applicable in that regime. A non-perturbative method like lattice QCD is thus required to obtain an estimate of the necessary observables. ...
    • Model Studies Of The Hot And Dense Strongly Interacting Matter 

      Chatterjee, Sandeep (2016-04-25)
      Ultra-relativisitic heavy ion collisions produce quark gluon plasma-a hot and dense soup of deconfined quarks and gluons akin to the early universe. We study two models in the context of these collisions namely, Polyakov ...
    • New tools to constrain EFTs and CFTs 

      Zahed, Ahmadullah
      In this thesis, we develop new methods for the S matrix bootstrap in the context of 2-2 scattering amplitudes and four-point correlators in conformal field theories (CFTs). For 2-2 scattering in quantum field theories, ...
    • Novel Pathways for Beyond Standard Model Physics 

      Kushwaha, Ashwani
      In the light of discovering the Higgs boson and null results at the LHC, we look for new pathways for Beyond Standard Model Physics, which could accommodate at least one of the Standard Model shortcomings. (i) Unification ...
    • On Hypergeometric solutions of Feynman integrals using Mellin-Barnes Integrals with Applications 

      Banik, Sumit
      Experimental measurements of physical observables in particle colliders rely on high-precision theoretical calculations to validate the predictions of any theoretical model and detect signals of new physics. These theoretical ...
    • Phenomenological Explorations in Dark Matter 

      Chatterjee, Shiuli
      The previous decade has seen an explosive increase in explorations into the nature of dark matter (DM) encompassing astrophysical, particle and cosmological probes. We face today a large body of gravitational evidences ...
    • Probing Higgs Boson Interactions At Future Colliders 

      Biswal, Sudhansu Sekhar (2010-11-11)
      We present in this thesis a detailed analysis of Higgs boson interactions at future colliders. In particular we examine, in a model independent way, the sensitivity of an Linear Collider in probing the interaction of ...
    • Probing the Beyond Standard Model Physics in Top Quark and Dark Matter Sectors 

      Mendiratta, Gaurav (2018-05-22)
      The Standard Model (SM) of particle physics provides the theoretical framework to describe the fundamental interactions among elementary constituents of matter. SM is supported by experiments to a high degree of accuracy, ...
    • Quantum dynamics of weak measurements: Understanding the Born rule and applying weak error correction 

      Kumar, Parveen
      Projective measurement is used as a fundamental axiom in quantum mechanics, even though it is discontinuous and cannot predict which measured operator eigen state will be observed in which experimental run. The probabilistic ...