HEP-theory
Research Interests: I have been doing research mainly in Yang-Mills Field Theory, QCD, physics beyond the standard model and String Theory.
In 1977 I have predicted existence of the chromomagnetic gluon condensation. This discovery was based on the calculation of the effective Lagrangian in Yang-Mills theory, which represents the generalization of the Heisenberg-Euler quantum Lagrangian. The other areas of research includes:
exact solution of renormalization group equations for the effective Lagrangian in Abelian and non-Abelian gauge theories in terms of the beta function and the expression of the intensity of the chromomagnetic gluon condensate to all orders of perturbation theory. The vacuum solutions of Yang-Mills theory have been found in the form of nonlinear plane waves and non-integrability and dynamical stochasticity of these solutions established. The concept of Yang-Mills Classical and Quantum mechanics was introduced.
Application of Ergodic theory to the problem of integrability of classical Yang-Mills equations and demonstration that it is a maximally chaotic dynamical system.
Quantization of relativistic membrane in the light-cone gauge and its duality with the Yang-Mills classical mechanics. Notion of self-dual membrane. I suggested a linear model for QCD string by extending the Feynman path integral to an integral over the surfaces, with the action which is proportional to the linear size of the surface, this is the so called Gonihedric String. This new concept was used in statistical physics to define a new class of Ising type spin systems with the partition function which is a sum over random surfaces with Gonihedric action.
Geometrical nature of the system allows to perform the duality transformation and to find out a new class of gauge spin systems, which are similar to the 3D Ising ferromagnet and Wegner 3D gauge spin systems. In Astrophysics I have been studding N-body problem by means of the Maupertuis principle reducing it to the study of the behavior of the geodesic flow on a Reimannian manifold. Negativity of the corresponding curvature allows to establish the exponential instability of the geodesic trajectories and to compute the relaxation time for the stellar systems like galaxies and globular clusters. That time is substantially smaller than binary, Chandrasekhar relaxation time. In Computational mathematics we have suggested to use maximally chaotic dynamical systems of Kolmogorov-Anosov-Artin type to generate pseudo-random numbers for the Monte-Carlo simulations of physical systems. The concrete realization of the MIXMAX generator has large entropy, is fast and has good spectral properties. The generator was implemented into the main CERN toolkits: Gean4/CLHEP, ROOT and CMS experiment.
I am a PhD student currently working on next-to-next-to-leading order calculations (NNLO) for high energy scattering processes, in the framework of perturbative Quantum Chromodynamics. In order to test our comprehension of nature in a significant way we need the theoretical calculation of scattering amplitudes in an accuracy similar to the experimental one. The high-luminosity LHC at CERN will require the most precise theoretical predictions for the scattering amplitudes. NNLO and in several cases NNNLO calculations will be of paramount importance to achieve the required precision. Pursuing this ultimate goal within my dissertation I study the systematization of the way of finding the Canonical Basis of Master Integrals for a given two-loop family, and the extension of the OPP method for one-loop amplitudes to the next order.
Supervisor
Dr. Costas Papadopoulos, Director of Research, Institute of Nuclear and Particle Physics, National Center for Scientific Research “Demokritos”.
Education
2011 – 2015: Bachelor of Science in Physics, Department of Physics, National and Kapodistrian University of Athens.
2015 – 2017: Master of Science in Basic Physics with specialization to Nuclear and Particle Physics, Department of Physics, National and Kapodistrian University of Athens.
2018 – today: PhD student, Department of Physics, National and Kapodistrian University of Athens & Institute of Nuclear and Particle Physics, National Center for Scientific Research “Demokritos”.
Research interests
Particle Physics Phenomenology
Quantum Field Theory
Early Universe Physics Publications On the Catalysis of Electroweak Vacuum Decay by Black Holes at High Temperatures, D. Canko, I. Gialamas, G. Jelic – Cizmek, A. Riotto, N. Tetradis, European Physics Journal C (2018) 78:328, DOI: https://doi.org/10.1140/epjc/s10052-018-5808-y (arXiv: 1706.01364 [hep-th]). A simple F(R,φ) deformation of Starobinsky inflationary model, D. Canko, I. Gialamas, G. Kodaxis, arXiv: 1901.06296 [hep-th].
My name is Nikolaos Syrrakos and I am a PhD student currently working on calculating next-to-next-to-leading order (NNLO) corrections to scattering processes that are produced in high energy colliders, such as the LHC at CERN. The topic of my dissertation is the computation of two-loop Master Integrals with the method of differential equations. Following the LHC upgrade to High Luminosity-LHC, very precise theoretical predictions for scattering cross sections will be required to match the experimental accuracy, in order to determine any discrepancy between theory and experiment. A key ingredient of the required theoretical predictions is the computation of two-loop Master Integrals for the relevant scattering processes.
Supervisors
Dr. Konstantinos Papadopoulos, Institute of Nuclear and Particle Physics, National Center for Scientific Research “Demokritos”.Prof. Nikolaos Trakas, School of Applied Mathematics and Natural Sciences, National Technical University of Athens.
Education
(2014) BSc in Physics, Department of Physics, National and Kapodistrian University of Athens.
(2017) MSc in Physics, School of Applied Mathematics and Natural Sciences, National Technical University of Athens & National Center for Scientific Research “Demokritos”.
(2018 – today) PhD student, School of Applied Mathematics and Natural Sciences, National Technical University of Athens & Institute of Nuclear and Particle Physics, National Center for Scientific Research “Demokritos”.