Tinglong Feng

My name is Tinglong Feng (冯廷龙), and I am a master’s student at the Institute for Theoretical Physics, Utrecht University. Originally trained in medicine at Xi’an Jiaotong University, my passion lies in astrophysics. My research spans cosmology, where I explored the in-in formalism for pseudo-Hermitian systems, as well as Holographic Neutron Stars and planetary system stability. I am currently seeking research opportunities in astrophysics and planning to pursue a PhD to advance my research career.

My hobbies are reading history books and fantasy literatures. I find it fascinating to explore the uniformity and complexity in European history, and I was so attracted by the fantasy world created by Tolkien that I learned a little Quenya language.

Liberté, Égalité, Fraternité
- devise de la République française

latest posts

Oct 23, 2023	Personal Statement
Sep 26, 2023	Nationalism in early medieval Europe

selected publications

2024

arXiv

Correlators for pseudo Hermitian systems

Yao Bai, Ting-Long Feng, Suro Kim, and 4 more authors

arXiv preprint arXiv:2408.07506, 2024

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Pseudo-Hermitian system is a class of non-Hermitian system with Hamiltonian satisfying the condition η^-1H^\daggerη=H. We develop the in-in and Schwinger Keldysh formalism to calculate cosmological correlators for pseudo-Hermitian systems. We study a model consists of massive symplectic fermions coupled to the primordial curvature perturbation. The three-point function for the primordial curvature perturbation is computed up to one-loop and compared to earlier work where the loop correction comes from a massive scalar boson. The two results differ by a minus sign. Therefore, the one loop correction to the three-point function cannot be used to distinguished scalar bosons and symplectic fermions. To conclude, we discuss possibilities where the scalar bosons and symplectic fermions may be distinguished.