Gravity Resonance Spectroscopy and Dark Energy Symmetron Fields

Acoustic Rabi oscillations between gravitational quantum states and impact on symmetron dark energy

The standard model of cosmology provides a robust description of the evolution of the universe. Nevertheless, the small magnitude of the vacuum energy is troubling from a theoretical point of view. An appealing resolution to this problem is to introduce additional scalar fields. However, these have so far escaped experimental detection, suggesting some kind of screening mechanism may be at play. Although extensive exclusion regions in parameter space have been established for one screening candidate - chameleon fields - another natural screening mechanism based on spontaneous symmetry breaking…

桌面实验与月球激光测距中标量场暗能量的数值方法

Numerical Methods for Scalar Field Dark Energy in Table-top Experiments and Lunar Laser Ranging

针对环境依赖的伸缩子暗能量场数值求解困难的问题，提出精确解基准、重参数化方法和非均匀有限差分算法，可推广至其他标量-张量理论，适用于多类暗能量探测实验。

Collision times in pi-pi and pi-K scattering and spectroscopy of meson resonances

Using the concept of collision time (time delay) introduced by Eisenbud and Wigner and its connection to on-shell intermediate unstable states, we study mesonic resonances in pi-pi and pi-K scattering. The time-delay method proves its usefulness by revealing the spectrum of the well-known rho- and K*-mesons and by supporting some speculations on rho-mesons in the 1200 MeV region. We use this method further to shed some light on more speculative meson resonances, among others the enigmatic scalars. We confirm the existence of chiralons below 1 GeV in the unflavoured and strange meson sector.

Hadron Spectroscopy and Resonances: Review

I review recent results on hadron spectroscopy using lattice QCD. In light of the discoveries in heavy baryon sector at LHCb over the past few years, lattice calculations in this regard are emphasized. Investigations on light baryon, heavy-heavy and heavy-light meson resonances are also discussed.

Spectroscopy of Light Baryons: $Δ$ Resonances

The spectroscopy of light, strange baryons have been an important aspect with still unknown resonances and intrinsic baryonic properties. The present document is focused on the $Δ$ baryons unlike earlier work, here all the four isospin states have been separately obtained treating u and d quarks with different constituent masses. The theoretical framework for calculating the resonance masses is hypercentral Constituent Quark Model (hCQM). The confining potential is taken as of linear form alongwith the addition of spin-dependent as well as first order correction term. The results obtained have…

On spectroscopy of rho', rho'', and omega', omega'' resonances

Based on coupling constants extracted from fitting various data, the selected branching ratios and full widths of rho', rho'', and omega', omega'' resonances are calculated, and some topics on the spectroscopy of these states are discussed.