4 papers
The nano-hertz and milli-hertz stochastic gravitational waves in the minimal clockwork axion model
Xiangwei Yin, Cheng-Wei Chiang, Bo-Qiang Lu +1
The clockwork framework can realize TeV-scale symmetry breaking while generating a large axion decay constant \(f_a\). We propose a minimal clockwork axion model with t…
Probing Primordial Black Hole Formation from Domain Wall Isocurvature Perturbations: Constraints and Implications
Bo-Qiang Lu, Cheng-Wei Chiang, Tianjun Li
Domain walls are topological defects produced by the spontaneous symmetry-breaking of discrete symmetry during cosmological phase transitions. Domain walls can significantly contri…
Primordial Black Holes from Domain Wall Density Fluctuations: Bridging Gravitational Wave Observations Across Two Frequency Bands
Bo-Qiang Lu, Cheng-Wei Chiang, Tianjun Li
We propose a novel mechanism for the formation of primordial black holes by demonstrating that the delayed production of isocurvature perturbations resulting from Poisson fluctuati…
Family Unification in Grand Unification
Cheng-Wei Chiang, Tianjun Li, Naoki Yamatsu
We propose a unified model for the three Standard Model (SM) gauge symmetries and family symmetry based on grand unified gauge symmetry on six-dimensional (6D) spa…