Fizik: Recent submissions

  • A ramond-nevu schwarz string one end fixed 
    Arapoğlu, A. Savaş. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2005., 2005.)
    We study an open string with one end free and the other fixed on a D0-brane as a qualitative guide to the spectrum of hadrons containing one very heavy quark. We first consider the bosonic degrees of freedom, then introduce ...
  • Dense molecular gas tracers in water megamaser galaxies 
    Farhan, Ahlam. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2021., 2021.)
    Since their discovery in 1979, water megamasers (H2OMMs) have been of special interest for both astrophysicists and cosmologists. The unique environment they are emitted from is interesting, being located inside accretion ...
  • Multiparameter generalization of deformed particle algebras 
    Arıkan, Ali Serdar. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2004., 2004.)
    In this study, we generalize deformed boson and fermion algebras by considering as many deformation parameters as possible. The restriction on the number of deformation parameters emerges from the relations leaving the ...
  • Adiabatic solutions in general relativity and boundary symmetries 
    Kutluk, Emine Şeyma. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    We investigate adiabatic solutions to general relativity for a spacetime with spatial slices with boundary, by Manton approximation. This approximation tells us for a theory with a Lagrangian in the natural form, a motion ...
  • Measurement of heat, strain, and refractive index with multicore optical fibers 
    Güvenç Kılıç, Sema. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    In this thesis, different types of multicore optical fibers are designed and employed in the optical sensing experimental setups to investigate their detection abilities of temperature, heat transfer rate, strain, and ...
  • Some new cosmological applications of the energy-momentum squared gravity 
    Uzun, Nebiye Merve. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2021., 2021.)
    We investigate two specific forms of a new-type of modified gravity called Energy Momentum Squared Gravity (EMSG) constructed by the addition of the term f(TµνT µν) to the Einstein-Hilbert action with a cosmological constant ...
  • Frequency-resolved photoconductivity studies in amorphous chalcogenide films 
    Akat, Ercüment. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2000., 2000.)
    Frequency-resolved photocurrent measurements (FRPC) were carried out on amorphous chalcogenide films such as AsSeSb AsSe and AsSeTe, by a method called frequency-resolved spectroscopy (FRS) as a function of temperature ...
  • Light-matter interaction in photonic cavities 
    Gökbulut, Belkıs. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    In this thesis, light‒matter interaction in several novel photonic platforms are investigated by time-resolved fluorescence lifetime measurements along with their theoretical and numerical analyses. Firstly, a simple ...
  • Linac and damping ring designs of the future circular e+e− collider of CERN 
    Oğur, Salim. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    CERN has started the design of a 98 km circular positron-electron collider as a first step of the global Future Circular Collider (FCC) project since 2014. The FCCe+e− is being designed to furnish high luminosities for Z, ...
  • Mechanical characterization of cells and tissues by scanning acoustic microscopy and optical tweezers 
    Demirkan, İrem. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    Cell and tissue mechanics has a vital role in several pathological and physiological processes. Mechanical perturbations produce numerous biological processes within a cell or a tissue, which can result in mechanical ...
  • Scaling solutions of N = 2 supergravity and holography 
    Mirfendereski, Delaram. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    The 4D N = 2 SUGRA is the low energy limit of Type II string theory compactified on a Calabi-Yau three-fold. The theory contains BPS black holes with multi centered configurations consisting of bound states of dyonic ...
  • Spin orientations and spin-orbit torque in magnetic nanostructures 
    Karakaş, Vedat. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    In this thesis three different spintronic devices and their static behaviours are studied under external magnetic field or applied current. We started to work on the static properties of magnetic antivortices, formed in a ...
  • A study of non-cool core galaxy clusters and the feedback from their central active galactic nuclei 
    Tümer, Ayşegül. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    The study of the brightest cluster galaxy (BCG) coronae of non-cool core (NCC) galaxy clusters and their central active galactic nuclei (AGN) is crucial for the under standing of the BCG’s role on galaxy cluster evolution ...
  • Fibre optic wedge type cavity random laser 
    Yartaşı, Ekrem. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    In this work, a fibre optic wedge type cavity, with arbitrarily distributed scattering centres, is employed to construct a flexible, cost effective and low threshold random laser. The wedge cavity is obtained through the ...
  • Quantum phenomena and shape dynamics 
    Dündar, Furkan Semih. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    In this thesis, we considered quantum phenomena (Unruh effect) in Shape Dy namics, version of Bohmian Mechanics that is compatible with Mach’s Principle, and a solution (gravitational collapse of a spherically symmetric ...
  • Photoacoustic signal detection via atomic force microscopy cantilevers 
    Demirkıran, Aytaç. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    In this thesis, we first present a custom-designed photoacoustic microscopy system (PAM) which includes two separate excitation lasers. One of these tools is a novel fiber-based laser system developed particularly for ...
  • A new methodology for climate model selection and application to temperature, heat wave, WBGT and labor productivity analysis 
    Altınsoy, Hamza. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    In this thesis, the answers to four main research questions are sought. The first effort is about the finding the most accurate model combinations to project intended climate variables. A new methodology is proposed and ...
  • Photoacoustic signal characterization of cell morphology in microchannel flow 
    Uluç, Nasire. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    Photoacoustic (PA) imaging, a hybrid imaging modality, provides both functional and structural information of biological tissue by combining both optical imaging and ultrasound imaging. It takes advantages of high contrast ...
  • Cosmology and spontaneous symmetry breaking 
    Saygılı, Kamuran. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1998., 1998.)
    In the first problem we investigate a model which incorporates spontaneous symmetry breaking and gravitation in the context of scalar-tensor theory. Present day value of the gravitational constant is induced by the vacuum ...
  • 3D optical profilometry using fiber optics lloyd's mirror method 
    Köseoğlu, Gülşen. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    A ber optic Lloyd's mirror assembly is investigated to obtain various optical interference patterns for the detection of three-dimensional shapes of rigid bodies. Two types of the ber optic Lloyds systems are used in ...

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