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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 82 for “"Effective Field Theory"”.
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Beryllium-9 in Cluster Effective Field Theory
… in order to study them through the use of Effective Field Theory (EFT) potentials. After a brief introduction, that will show why this type of nuclei are important in the study of stellar nucleosynthesis, I introduce the Hyperspherical Harmonics basis with which the calculations were …
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On effective field theory of dark matter
… Universe as a spin-$\frac{1}{2}$ fermion using effective field theories to parametrise the higher order physics. Our goal is to determine the requirements for exclusion of such particles by direct and indirect detection. In part~\ref{part:1}, based on ref.~\cite{geytenbeek21}, we introduce a …
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Effective field theory of the electroweak sector
Effective field theory is a model-independent way to search for indirect effects of new physics. It has many advantages over the traditional anomalous couplings framework. In particular, gauge invariance makes possible the calculation of loop corrections. Furthermore, the issue of unitarity …
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Effective field theory for top quark physics
… possible new physics. In this dissertation an effective-field-theory approach to top quark physics is suggested. In this approach, the leading effects of new physics at relatively low energy scale is parametrized by effective operators which have mass dimension six. We first consider top-quark …
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Modeling Compact Objects with Effective Field Theory
… master's thesis we have developed a worldline Effective Field Theory of compact objects, by extending the model of spinning extended objects derived using the coset construction [1], from which one can derive the effective theory from symmetry principles. To massive spinning extended objects, …
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Nuclear Electromagnetic Currents in Chiral Effective Field Theory
… electromagnetic currents are derived in chiral effective field theory retaining pions and nucleons as explicit degrees of freedom. The calculation of the potential is carried out up to next-to-next-to leading order (N<sup>2</sup>LO), while the currents include up to N<sup>3</sup>LO corrections. …
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The Effective Field Theory Approach to Fluid Dynamics
… a systematic study of fluid dynamics using the effective field theory (EFT) program. We consider the canonical quantization of an ordinary fluid in an attempt to discover if there is some kind of quantum mechanical inconsistency with ordinary fluids at zero temperature. The system exhibits a …
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Renormalization and effective field theory using the energy scale
In this thesis, we develop the notion of an effective field theory using the energy scale and present an algorithm for constructing counterterms based on the choice of a renormalization scheme.
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Chiral effective field theory beyond the power-counting regime.
Chiral effective field theory complements numerical simulations of quantum chromodynamics on a spacetime lattice. It provides a model-independent formalism for connecting lattice simulation results at finite volume, and at a variety of quark masses, to the physical region. Knowledge of the …
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The ΛCDM Effective Field Theory of Large Scale Structure
… of motion using a power series in the density field, which is physically interpreted as a perturbative expansion around a linear solution describing idealised, large scale dynamics. Until the past decade, these perturbative methods took the form of what is called Standard Perturbation Theory …
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Jet Definitions in Effective Field Theory and Decaying Dark Matter
… matter are studied. The powerful framework of effective field theory is applied in both cases to further our knowledge of particle physics. We first discuss how to apply the Soft Collinear Effective Theory (SCET) for calculating hadronic jet production rate. By applying SCET power counting, we …
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Effective Field Theory for Doubly Heavy Baryons and Lattice QCD
<p>In this thesis, we study effective field theories for doubly heavy baryons and lattice QCD. We construct a chiral Lagrangian for doubly heavy baryons and heavy mesons that is invariant under heavy quark-diquark symmetry at leading order and includes the leading O(1/m_Q ) symmetry violating …
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NEW GRAVITATIONAL INTERACTIONS IN COSMOLOGY —- FROM EFFECTIVE FIELD THEORY TO OBSERVATION
… I then turn to more formal considerations of Effective Field Theories (EFTs) in cosmology. In particular, I show how to generalize the EFT of the binary black hole system to extended objects, constructing the EFT for a binary cosmic string system. I further study the EFT for symmetry-breaking …
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The Effective Field Theory Approach to Fluid Dynamics, Modified Gravity Theories, and Cosmology
The effective field theory approach is powerful in understanding the low energy phenomena without invoking the UV degrees of freedom. We construct a low energy Lagrangian for ordinary fluid systems (in constrast to superfluid), pure from symmetry considerations and EFT principles. The dynamical …
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Pionless Effective Field Theory: Building the Bridge Between Lattice Quantum Chromodynamics and Nuclear Physics
… systems and $^{16}$O using \eftnopi (Pionless Effective Field Theory) at \ac{LO}. This is the first time the theory is extended to many-body nuclear systems. The free constants of the interaction are fitted using both experimental data and \ac{LQCD} results. The nuclear many-body Schr\"odinger …
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Cluster Effective Field Theory calculation of electromagnetic breakup reactions with the Lorentz Integral Transform method
… Within this framework a halo/cluster Effective Field Theory (EFT) can be developed. The alpha-alpha and alpha-n effective interactions are defined in momentum space as a series of contact terms, regularized by a momentum-regulator function. The Low Energy Constants are expressed in …
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Studies of Two-Nucleon Interactions and Few-Body Electromagnetic Structure in Chiral Effective Field Theory
… potential is constructed in chiral effective field theory (χEFT) retaining pions, nucleons and Δ-isobars as explicit degrees of freedom. The calculation of the potential is carried out by including one-and two-pion-exchange contributions up to next-to-next-to-leading order (N2LO) and …
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Exclusive J/Ψ Vector-Meson production in high-energy nuclear collisions: a cross-section determinaton in the Colour Glass Condensate effective field theory and a feasibility study using the STARlight Monte Carlo event generator
… in the context of the Colour Glass Condensate effective field theory. Rapidity-averaged n-point correlators are used to describe the strong interaction part of this process. The JIMWLK equation can be used to predict the energy evolution of a correlator. In order to facilitate practical …
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