Mimar Sinan Güzel Sanatlar Üniversitesi Açık Bilim, Sanat Arşivi
Açık Bilim, Sanat Arşivi, Mimar Sinan Güzel Sanatlar Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.MSGSÜ'de Ara
Yazar "Pehlivan, Y." için listeleme
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Big-bang nucleosynthesis limit on the neutral fermion decays into neutrinos
Kusakabe, Motohiko; Balantekin, A. B.; Kajino, Toshitaka; Pehlivan, Y. (Amer Physical Soc, 2013)Using the primordial helium abundance, an upper limit to the magnetic moments for Dirac neutrinos had been provided by imposing restrictions on the number of the additional helicity states. Considering nonthermal photons ... -
Can We Scan the Supernova Model Space for Collective Oscillations?
Pehlivan, Y.; Subasi, A. L.; Birol, S.; Ghazanfari, N.; Yuksel, H.; Balantekin, A. B.; Kajino, Toshitaka (Amer Inst Physics, 2016)Collective neutrino oscillations in a core collapse supernova is a many-body phenomenon which can transform the neutrino energy spectra through emergent effects. One example of this behavior is the neutrino spectral swaps ... -
Entangled neutrinos in a supernova
Pehlivan, Y.; Birol, Savas (IOP Publishing Ltd, 2022)We consider the entanglement of neutrinos evolving adiabatically under the effect of vacuum oscillations and self interactions through decreasing neutrino density similar to a core collapse supernova. For an initial state ... -
Invariants of collective neutrino oscillations
Pehlivan, Y.; Balantekin, A. B.; Kajino, Toshitaka; Yoshida, Takashi (Amer Physical Soc, 2011)We consider the flavor evolution of a dense neutrino gas by taking into account both vacuum oscillations and self-interactions of neutrinos. We examine the system from a many-body perspective as well as from the point of ... -
Neutrino magnetic moment, CP violation, and flavor oscillations in matter
Pehlivan, Y.; Balantekin, A. B.; Kajino, Toshitaka (Amer Physical Soc, 2014)We consider collective oscillations of neutrinos, which are emergent nonlinear flavor evolution phenomena instigated by neutrino-neutrino interactions in astrophysical environments with sufficiently high neutrino densities. ... -
Neutrino spectral split in the exact many-body formalism
Birol, Savas; Pehlivan, Y.; Balantekin, A. B.; Kajino, T. (Amer Physical Soc, 2018)We consider the many-body system of neutrinos interacting with each other through neutral current weak force. Emerging many-body effects in such a system could play important roles in some astrophysical sites such as the ... -
On the Neutrino Self Refraction Problem from a Many-Body Perspective
Pehlivan, Y.; Kajino, Toshitaka; Balantekin, A. B.; Yoshida, Takashi; Maruyama, Tomoyuki (Amer Inst Physics, 2010)We consider a dense neutrino gas as a many body system by taking into account both vacuum oscillations and self interactions of neutrinos. We show that the exact many body Hamiltonian which describes the flavor oscillations ... -
Photodisintegration at High Temperature
Pehlivan, Y.; Kajino, Toshitaka; Balantekin, A. B.; Mathews, G. J.; Kusakabe, Motohiko (Amer Inst Physics, 2010)The conventional method of calculating rates for photodisintegration reactions treats the photon as a classical particle and therefore is missing a correction due to the quantum statistics of the photon energy distribution. ... -
Possible effects of collective neutrino oscillations in three-flavor multiangle simulations of supernova vp processes
Sasaki, H.; Kajino, T.; Takiwaki, T.; Hayakawa, T.; Balantekin, A. B.; Pehlivan, Y. (Amer Physical Soc, 2017)We study the effects of collective neutrino oscillations on vp process nucleosynthesis in proton-rich neutrino-driven winds by including both the multiangle 3 x 3 flavor mixing and the nucleosynthesis network calculation. ... -
Solution to Big-Bang nucleosynthesis in hybrid axion dark matter model
Kusakabe, Motohiko; Balantekin, A. B.; Kajino, Toshitaka; Pehlivan, Y. (Elsevier, 2013)Following a recent suggestion of axion cooling of photons between the nucleosynthesis and recombination epochs in the Early Universe, we investigate a hybrid model with both axions and relic supersymmetric particles. In ... -
Spectral splits of neutrinos as a BCS-BEC crossover type phenomenon
Pehlivan, Y.; Subasi, A. L.; Ghazanfari, N.; Birol, S.; Yuksel, H. (Amer Physical Soc, 2017)We show that the spectral split of a neutrino ensemble, which initially consists of electron type neutrinos, is analogous to the Bardeen-Cooper-Schrieffer-Bose-Einstein condensate (BCS-BEC) crossover already observed in ... -
Spin-flavor precession phase effects in supernova
Bulmus, T.; Pehlivan, Y. (Elsevier, 2024)We study the phase effects driven by neutrino magnetic moment for Majorana neutrinos in a core collapse supernova. A neutrino with a large magnetic moment is emitted in a superposition of energy eigenstates from the ... -
Symmetry and supersymmetry in nuclear pairing: exact solutions
Balantekin, A. B.; Pehlivan, Y. (Iop Publishing Ltd, 2011)Pairing plays a crucial role in nuclear spectra and attempts to describe it has a long history in nuclear physics. The limiting case in which all single particle states are degenerate, but with different s-wave pairing ... -
Time dependent signatures of core-collapse supernova neutrinos at HALO
Ekinci, B.; Pehlivan, Y.; Patwardhan, Amol, V (Amer Physical Soc, 2021)We calculate the response of a lead-based detector, such as the Helium and Lead Observatory (HALO) or its planned upgrade HALO-1kt to a Galactic core-collapse supernova. We pay particular attention to the time dependence ...
