Mehmet Kavuk
A5002418161- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Relativity and Gravitational Theory
- Solar and Space Plasma Dynamics
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Geophysics and Gravity Measurements
- Particle physics theoretical and experimental studies
Doğuş University
2015
Institute for Nuclear Research
2015
Boğaziçi University
2014
The CERN Axion Solar Telescope (CAST) searches for $a\ensuremath{\rightarrow}\ensuremath{\gamma}$ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward Sun. Two parallel bores filled with helium adjustable pressure to match x-ray refractive mass ${m}_{\ensuremath{\gamma}}$ axion search ${m}_{a}$. After vacuum phase (2003--2004), which is optimal ${m}_{a}\ensuremath{\lesssim}0.02\text{ }\text{ }\mathrm{eV}$, we used $^{4}\mathrm{He}$ 2005--2007...
In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in field of dark energy research, exploits both chameleon coupling to matter (βm) and photons (βγ) via Primakoff effect. By reducing X-ray detection threshold used axions from 1 keV 400 eV CAST became sensitive converted solar spectrum which peaks around 600 eV. Even though have not observed any excess above background, can provide 95% C.L. limit strength...
We investigate a cosmological model in which the Stueckelberg fields are non-minimally coupled to scalar curvature gauge invariant manner. present not only solution that can be considered context of late time acceleration universe but also compatible with inflationary cosmology. Distinct behaviors and vector together real valued mass gained by mechanism lead go through two different accelerated expansion phases decelerated phase between them. On other hand, solutions we present, if is null...