2 citations · 9 across the 6 of their papers we have counts for
6 papers
Degree of arbitrariness directly from moving frames
Ziyang Hu
For physical theories, the degree of arbitrariness of a system is of great importance, and is often closely linked to the concept of degree of freedom, and for most systems this nu…
The implications of Galilean invariance for classical point particle lagrangians
Ziyang Hu
We explore the implications of the requirement of Galilean invariance for classical point particle lagrangians, in which the space is not assumed to be flat to begin with. We show…
A framework for structure-preserving submersions and some theorems in relativistic flows
Ziyang Hu
In this paper we first propose a framework of structure-preserving submersions, which generalises the concept of a Riemannian submersion, and dualises the concept of subgeometry, o…
Born-Rigid Flow and the AdS-CFT Correspondence
Ziyang Hu
This paper reviews the concepts and assumptions of rigid flow in relativistic fluid mech- anics, particularly the generalisation of the classical Herglotz-Noether theorem, that are…
On the General Problem of Structure-Preserving Submersions
Ziyang Hu
In this paper we give a general geometrical framework for working with problems that can be described as a structure-preserving submersion defined on a suitable space with a geomet…
A modern view of the classical Herglotz-Noether theorem
Ziyang Hu
In this paper we give a new proof, valid for all dimensions, of the classical Herglotz-Noether theorem that all rotational shear-free and expansion-free flows (rotational Born-rigi…