Sargın, Ozan
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Sargin, Ozan
Sargin, O
Sargin, O.
Sargın, O
Sargın, O.
Sargin, O
Sargin, O.
Sargın, O
Sargın, O.
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04.05. Department of Pyhsics
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8
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26
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4
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7
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5
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1
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1
WoS Citation Count
21
Scopus Citation Count
20
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7
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2
| Journal | Count |
|---|---|
| Advances in High Energy Physics | 1 |
| EPL | 1 |
| European Physical Journal C | 1 |
| Physical Review D | 1 |
| Physics Letters, Section A: General, Atomic and Solid State Physics | 1 |
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Master Thesis Tunneling in Polymer Quantization and Quantum Zeno Effect(Izmir Institute of Technology, 2014) Sargın, Ozan; Demir, Durmuş AliPolymer quantization is a non-standard and exotic representation of the canonical commutation relations which is introduced in the context of loop quantum gravity to investigate the low energy limit of this non-perturbative quantization of gravity. It is one of the representations of the Weyl-Heisenberg algebra which is inequivalent to the standard Schr¨odinger representation. Since this representation is inequivalent to Schr¨odinger mechanics, by Stone-von Neuman uniqueness theorem there should not be a one to one correspondence between the operators of the two representations. It turns out that, one can not define the position and momentum operators simultaneously in this construction. In this work, we use the standard position operator and a second operator which is the analog of ^p. To define an operator similar to the momentum operator ^p, one needs to use a regularization length scale which can not be removed and stays as a free parameter in the theory. This free parameter is interpreted to descend from the fundamental discreteness of space in loop quantum gravity. As another application of the polymer quantization scheme, in this work we investigate the one dimensional quantum mechanical tunneling phenomenon from the perspective of polymer representation of a non-relativistic point particle, derive the transmission and reflection coefficients and show that they add up to one which is the requirement of probability conservation. Since any tunneling phenomenon inevitably evokes a tunneling time we attempt an analytical calculation of tunneling times by defining an operator well suited in discrete spatial geometry. We expand our time expression in a Maclaurin series around zero polymer length scale and arrive at results which hint at appearance of the Quantum Zeno Effect in polymer framework. Quantum Zeno effect is the inhibition of a quantum system from making a transition from an initial state to a final state. And in summary, as a result of our work we can say that discretization of space leads to the Quantum Zeno effect.Doctoral Thesis Physics of Higher Spin Fields(Izmir Institute of Technology, 2020) Sargın, Ozan; Güçlü, Alev DevrimSpin-3/2 fields are the next spin multiplet we look for in the general particle search. Although these fields can be either fundamental vector-spinors or just excited leptons and quarks we assume that they are fundamental throughout this thesis. These higher-spin fields, described by the Rarita-Schwinger equations have to obey certain constraints to have correct degrees of freedom when they are on the physical shell. \par In the first chapter after the introduction, we introduce these spinor-vector fields to the reader by first going through the different representations that can be employed to describe them. We then recapitulate some facts on the most general free lagrangian and the propagator for these fields. \par In the next chapters we investigate different phenomenological implications. We start out in chapter \ref{chap:1} with a massive spin-3/2 field hidden in the standard model (SM) spectrum thanks to the form of the special interaction that vanishes when the field falls into the mass shell. Different collider signatures are investigated through analytical computations and numerical predictions. \par In chapter \ref{chap:2}, we assume that the Higgs boson stays stable via a finely tuned hidden sector which involves a spin-3/2 field that is split from the SM and whose sole contact with it at the renormalizable level is through the neutrino portal. Then, the total mass correction to the Higgs mass is used as a constraint to calculate the mass scale of the spin-3/2 field. \par Lastly, we investigate the possible role that a spin-3/2 field could play in leptogenesis. Our model incorporates a spin-3/2 field in addition to the type-I see-saw fields in inducing the CP asymmetry and mitigating the naturalness problem of the Higgs boson. We investigate the plausibility in regard to successful leptogenesis with no side effects, specifically the naturalness of the Higgs boson and correct prediction of the active neutrino masses.Article Citation - WoS: 8Citation - Scopus: 8Tunneling in Polymer Quantization and the Quantum Zeno Effect(Elsevier Ltd., 2014) Demir, Durmuş Ali; Sargın, OzanAs an application of the polymer quantization scheme, in this work we investigate the one-dimensional quantum mechanical tunneling phenomenon from the perspective of polymer representation of a non-relativistic point particle and derive the transmission and reflection coefficients. Since any tunneling phenomenon inevitably evokes a tunneling time, we attempt an analytical calculation of tunneling times by defining an operator well suited in discrete spatial geometry. The results that we come up with hint at appearance of the Quantum Zeno Effect in polymer framework.Article Citation - WoS: 1Citation - Scopus: 1Type-3/2 Seesaw Mechanism(American Physical Society, 2021) Demir, Durmuş Ali; Karahan, Canan; Sargın, OzanThe type-I seesaw mechanism provides a natural explanation for tiny neutrino masses. The right-handed neutrino masses it requires are, however, too large to keep the Higgs boson mass at its measured value. We show that vector spinors, singlet leptons that are like right-handed neutrinos, generate tiny neutrino masses naturally through the exchange of spin-1/2 and spin-3/2 components. This one-step seesaw mechanism, which we call the type-3/2 seesaw, keeps the Higgs boson mass unchanged at one loop and gives cause therefore to no fine-tuning problem. If the on-shell vector spinor is a pure spin-3/2 particle, then it becomes a potential candidate for hidden dark matter which gets diluted due only to the expansion of the Universe. The type-3/2 seesaw provides a natural framework for the neutrino, Higgs boson, and dark matter sectors, with overall agreement with current experiments and observations.Article Citation - WoS: 8Citation - Scopus: 7Violation of the Holographic Principle in the Loop Quantum Gravity(Institute of Physics Publishing, 2016) Sargın, Ozan; Faizal, MirIn this paper, we analyze the holographic principle using loop quantum gravity (LQG). This will be done by using polymeric quantization for analysing Yurtsever's holographic bound on the entropy, which is obtained from local quantum field theories. As the polymeric quantization is the characteristic feature of loop quantum gravity, we will argue that this calculation will indicate the effect of loop quantum gravity on the holographic principle. Thus, we will be able to explicitly demonstrate the violation of the holographic principle in the loop quantum gravity.Article Fine-Tuned Spin-3/2 and the Hierarchy Problem(Hindawi Publishing Corporation, 2020) Sargın, OzanIn the past, Kundu et al. and Chakraborty et al. used extra scalar fields to cancel the quadratic divergences in the Higgs mass squared and they determined the mass of the required scalar field. In this work, a spin-3/2 particle has been used in the same manner to nullify the power-law divergences, and it is determined that the mass of the spin-3/2 particle resides in the ball park of the GUT scale.Article Citation - WoS: 4Citation - Scopus: 4Hidden Spin-3/2 Field in the Standard Model(Springer Verlag, 2017) Demir, Durmuş Ali; Karahan, Canan; Korutlu, Beste; Sargın, OzanHere we show that a massive spin-3/2 field can hide in the SM spectrum in a way revealing itself only virtually. We study collider signatures and loop effects of this field, and determine its role in Higgs inflation and its potential as dark matter. We show that this spin-3/2 field has a rich linear collider phenomenology and motivates consideration of a neutrino–Higgs collider. We also show that the study of Higgs inflation, dark matter and dark energy can reveal more about the neutrino and dark sector. © 2017, The Author(s).