Bai-Cian Ke

collaborators

4 papers

astro-ph.CO2026

A Class of Exact Single-Field Inflationary Solutions beyond Slow Roll

Jia-Wei Zhang, Bai-Cian Ke, Yao Yu +2

We construct exact solutions for single-field inflaton dynamics without invoking the slow-roll approximation. A suitable change of variables reduces the background equation to an A…

hep-ph2026

Angular and invariant-mass observables in the four-body Higgs decay $h \to ℓ ν ˉ_{ℓ} ℓ ˉ^{'} ν_{ℓ^{'}}$

Han Zhang, Bai-Cian Ke, Yao Yu +2

We study the angular distribution of the Higgs boson decay $h \to ℓ ν ˉ_{ℓ} ℓ ˉ^{'} ν_{ℓ^{'}}$ with $ℓ \neq = ℓ^{'}$ . Due to the presence of two undetected ne…

hep-ph2025

Testing Non-Standard Neutrinos in Purely Leptonic Lepton Decays

Han Zhang, Bai-Cian Ke, Yao Yu

We propose a method to probe sterile neutrinos using polarization observables in the purely leptonic decays $ℓ^{' -} \to ℓ^{-} ν ˉ_{ℓ} ν_{ℓ^{'}}$ . By analyzi…

astro-ph.CO2025

Power-Law Inflation Survives Observational Constraints

Yao Yu, Wen-Zhang Feng, Hong-Song Xie +2

Power-law inflation has stood as a classical model in inflationary cosmology since the early 1980s, prized for its exact analytical solutions and ability to naturally resolve the B…

A Class of Exact Single-Field Inflationary Solutions beyond Slow Roll

Angular and invariant-mass observables in the four-body Higgs decay h→ℓνˉℓ​ℓˉ′νℓ′​

Testing Non-Standard Neutrinos in Purely Leptonic Lepton Decays

Power-Law Inflation Survives Observational Constraints

Angular and invariant-mass observables in the four-body Higgs decay $h \to ℓ ν ˉ_{ℓ} ℓ ˉ^{'} ν_{ℓ^{'}}$