6 papers
-ring structure in differential K-theory
Bo Liu, Xiaonan Ma
We establish the splitting principle for differential K-theory, a refinement of topological K-theory that incorporates geometric data via differential forms. Using this principle,…
Dimension of Diophantine approximation and some applications in harmonic analysis
Longhui Li, Bochen Liu
In this paper we construct a new family of sets based on Diophantine approximation in the Euclidean space, and consider their applications in several problems in harmonic analysis.…
Llarull's theorem on noncompact manifolds with boundary
Bo Liu, Daoqiang Liu
Recently, Zhang \cite{Zh20} and Li-Su-Wang-Zhang \cite{LSWZ24+} generalized Llarull's theorem to the noncompact complete spin manifold. In this paper, we further extend their resul…
Fourier frames on smooth surfaces with nonvanishing Gaussian curvature
Xinyu Chen, Bochen Liu
It is known that a small spherical cap (rigorously its surface measure) admits Fourier frames, while the whole sphere does not. In this paper, we prove more general results. Conseq…
Fourier Frames on Salem Measures
Longhui Li, Bochen Liu
For every we construct -dimensional Salem measures in the unit interval that do not admit any Fourier frame. Our examples are generic for each , including all exi…
Orthogonal projection, dual Furstenberg problem, and discretized sum-product
Longhui Li, Bochen Liu
In this paper we come up with a dual version of the Furstenberg problem and obtain partial results via estimates of orthogonal projections. Examples are also discussed. Moreo…