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6 papers

gr-qc2026

Foldy--Wouthuysen Transformation of the Generalized Dirac Equation in Symmetric Teleparallel Gravity

Sabutay Ugur, Muzaffer Adak, Ali Bagci +1

The paper derives the non‑relativistic Hamiltonian for a generalized Dirac fermion in a weak, static symmetric teleparallel gravitational field, using Foldy–Wouthuysen transformati…

gr-qc2026

Symmetric teleparallel gravitational effects on solar neutrino oscillations

Aysel Cetinkaya, Muzaffer Adak, Ozcan Sert +1

Neutrino oscillations probe the quantum gravity interface in unique ways. While gravitational effects on neutrinos are well studied in general relativity and torsion based geometri…

math-ph2026

The Generalized Dirac Equation in the Metric Affine Spacetime

Muzaffer Adak, Ali Bagci, Caglar Pala +1

We discuss the most general form of Dirac equation in the nonRiemannian spacetimes containing curvature, torsion and nonmetricity. It includes all bases of the Clifford algeb…

math-ph2026

General teleparallel geometric theory of defects

Muzaffer Adak, Ertan Kok, Mehmet Orhan

We revisit the geometric theory of defects. In the differential-geometric models of defects that have been adopted since the 1950s, dislocations have been associated with torsion,…

physics.optics2025

Geometric Optimization and IPA-Induced Dispersion Tuning in Solid-Core Photonic Crystal Fibers

Zekeriya Mehmet Yuksel, Hasan Oguz, Ozgur Onder Karakilinc +4

This study presents a numerical investigation of solid-core photonic crystal fibers with circular and hexagonal cladding geometries. The goal is to optimize optical parameters for…

math-ph2025

Reformulation of continuum defects in terms of the general teleparallel geometry in the language of exterior algebra

Muzaffer Adak, Tekin Dereli, Ertan Kok +1

We discuss the geometric formulation of continuum defects consisting of dislocations and disclinations. After reviewing the metric affine geometry and the present geometric formula…