Publications
2024
- arXivCorrelators for pseudo Hermitian systemsYao Bai, Ting-Long Feng, Suro Kim, and 4 more authorsarXiv preprint arXiv:2408.07506, 2024
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.
- arXivStability of the Potential Super Jupiter in Alpha Centauri SystemTinglong FengarXiv preprint arXiv:2406.19177, 2024
The stability of potential exoplanets in binary star systems remains a critical challenge in celestial mechanics. This study investigates the stability of a hypothetical Jupiter-mass planet in the Alpha Centauri AB system by drawing parallels with the recently detected Neptune-mass planet in the GJ65AB system, which shares similar mass ratios and orbital eccentricities. Utilizing the Kolmogorov-Arnold-Moser (KAM) theorem and the Mean Exponential Growth of Nearby Orbits (MEGNO) parameter within the REBOUND software package, we perform numerical simulations to identify stable orbital configurations. Our results indicate that a Jupiter-mass planet could theoretically maintain a stable orbit in Alpha Centauri AB, with orbital parameters derived from the stable zones observed in GJ65AB. Despite the absence of observational evidence for such a planet in Alpha Centauri AB, this study suggests that similar binary systems could exhibit analogous stability characteristics. Future observational efforts are recommended to explore this potential and refine our understanding of planetary formation in binary star systems.
- arXivHolographic Approach to Neutron StarsTinglong FengarXiv preprint arXiv:2401.01617, 2024
In this article we explore the holographic approach to neutron stars in the realm of Quantum Field Theory (QFT). We delve into the structures of neutron stars, emphasizing the application of the AdS/CFT duality in modeling them. We discuss both "bottom-up" and "top-down" holographic models, comparing their predictions with astrophysical observations. Finally, we demonstrate the potential broader applications of the holography method in areas like superconductivity, highlighting the methodological significance of string theory and QFT in astrophysics.