类轴子粒子与高能伽马射线：相互转化的再探讨

具有普适费米子耦合的类轴子粒子唯象学——再探讨

Phenomenology of axion-like particles with universal fermion couplings -- revisited

本文重新探讨了具有普适费米子耦合的类轴子粒子唯象学，分析了不同产生通道随质子碰撞能量和实验位置变化的层级与不确定性，并改进计算了强子衰变模式。

Isocurvature bounds on axions revisited

The axion is one of the best motivated candidates for particle dark matter. We study and update the constraints imposed by the recent CMB and LSS experiments on the mass of axions produced by the misalignment mechanism, as a function of both the inflationary scale and the reheating temperature. Under some particular although not unconventional assumptions, the axionic field induces too large isocurvature perturbations. Specifically, for inflation taking place at intermediate energy scales, we derive some restrictive limits which can only be evaded by assuming an efficient reheating mechanism, …

Strong CP problem and mirror world: the Weinberg Wilczek axion revisited

A new possibility for solving the strong CP-problem is suggested,which assumes that apart of the ordinary world of observable particles described by standard model, there exits a mirror sector of particles and two sectors share the same Peccei-Quinn symmetry realized {\it a là} Weinberg-Wilczek model. The mirror gauge group is completely analogous to that of the standard model for ordinary particles but having somewhat larger electroweak scale,which in turn implies the infrared scale $Λ'$ of the mirror strong interactions has to be larger than the ordinary QCD scale $Λ$. In this way, the axion…

重访利用声子极化激元探测轴子的方法

Axion detection with phonon-polaritons revisited

本文重新计算了轴子暗物质在材料中激发声子极化激元并转换为传播光子的功率输出，考虑有限体积和损耗后信号低于先前估计，并论证结合低温低损耗与探测器改进可探测约100 meV质量的QCD轴子。

Axions and the pulsation periods of variable white dwarfs revisited

Axions are the natural consequence of the introduction of the Peccei-Quinn symmetry to solve the strong CP problem. All the efforts to detect such elusive particles have failed up to now. Nevertheless, it has been recently shown that the luminosity function of white dwarfs is best fitted if axions with a mass of a few meV are included in the evolutionary calculations. Our aim is to show that variable white dwarfs can provide additional and independent evidence about the existence of axions. The evolution of a white dwarf is a slow cooling process that translates into a secular increase of the …

轴子类粒子直接探测的再研究

Direct detections of the Axion-like particle Revisited

本文重新研究轴子类粒子（ALP）的直接探测，首次考虑逆普里马科夫与逆康普顿散射振幅的干涉，发现大能量下干涉项主导，并基于新公式评估多个实验的约束，其中JUNO十年曝光可提供有竞争力的耦合限制。

DFSZ Axion Couplings Revisited

Among many possibilities, solar axion has been proposed to explain the electronic recoil events excess observed by Xenon1T collaboration, although it has tension with astrophysical observations. The axion couplings, to photon $g_{aγ}$ and to electron $g_{ae}$ play important roles. These couplings are related to the Peccei-Quinn (PQ) charges $X_f$ for fermions. In most of the calculations, $g_{aγ}$ is obtained by normalizing to the ratio of electromagnetic anomaly factor $E = TrX_f Q^2_f N_c$ ($N_c$ is 3 and 1 for quarks and charged leptons respectively) and QCD anomaly factor $N = TrX_q T(q)$ …

Higgs-dilaton 模型再探：dilaton 能否充当 QCD 轴子？

Higgs-dilaton model revisited: can dilaton act as QCD axion?

本文重新审视 Higgs-dilaton 模型，探讨 dilaton 作为 QCD 轴子解决强 CP 问题，并证明其可在低尺度暴胀后形成暗物质，构建了与 CMB 数据兼容的 Higgs 驱动暴胀模型。

The ALP miracle revisited

We revisit the ALP miracle scenario where the inflaton and dark matter are unified by a single axion-like particle (ALP). We first extend our previous analysis on the inflaton dynamics to identify the whole viable parameter space consistent with the CMB observation. Then, we evaluate the relic density of the ALP dark matter by incorporating uncertainties of the model-dependent couplings to the weak gauge bosons as well as the dissipation effect. The preferred ranges of the ALP mass and coupling to photons are found to be $0.01\lesssim m_ϕ\lesssim 1$\,eV and $g_{ϕγγ} = {\cal O}(10^{-11})$\,GeV$…

磁流体动力学预测轴子-光子转换的重尾分布

Magnetohydrodynamics predicts heavy-tailed distributions of axion-photon conversion

该研究利用磁流体动力学模拟，首次系统研究更真实湍流场中的轴子-光子转换，发现其转换比分布呈重尾，并证明基于高斯随机场的现有ALP限制依然稳健。

The semi-classical approximation at high temperature revisited

We revisit the semi-classical calculation of the size distribution of instantons at finite temperature in non-abelian gauge theories in four dimensions. The relevant functional determinants were first calculated in the seminal work of Gross, Pisarski and Yaffe and the results were used for a wide variety of applications including axions most recently. In this work we show that the uncertainty on the numerical evaluations and semi-analytical expressions are two orders of magnitude larger than claimed. As a result various quantities computed from the size distribution need to be reevaluated, for…

Modulations in Spectra of Galactic Gamma-ray sources as a result of photon-ALPs mixing

Axion like particles (ALPs) are fundamental pseudo scalar particles with properties similar to Axions which are a well-known extension of the standard model to solve the strong CP problem in Quantum Chromodynamics. ALPs can oscillate into photons and vice versa in the presence of an external tranversal magnetic field. This oscillation of photon and ALPs could have important implications for astronomical observations, i.e. a characteristic energy dependent attenuation in Gamma ray spectra for astrophysical sources. Here we have revisited the opportunity to search Photon-ALPs coupling in the dis…

Revisiting the production of ALPs at B-factories

In this paper, the production of Axion-Like Particles (ALPs) at $B$-factories via the process $e^+e^- \to γa$ is revisited. To this purpose, the relevant cross-section is computed via an effective Lagrangian with simultaneous ALP couplings to $b$-quarks and photons. The interplay between resonant and non-resonant contributions is shown to be relevant for experiments operating at $\sqrt{s}=m_{Υ(nS)}$, with $n=1,2,3$, while the non-resonant one dominates at $Υ(4S)$. These effects imply that the experimental searches performed at different quarkonia resonances are sensitive to complementary combi…