10 citations · 45 across the 11 of their papers we have counts for
5 papers · 2 filters
Dilaton-induced variations in Planck constant and speed of light: An alternative to Dark Energy
Hoang Ky Nguyen
We reveal a novel aspect of scale-invariant actions that allow matter to couple with a dilaton field: The dynamics of the dilaton can induce variations in the Planck constant $…
A mechanism to generate varying speed of light via Higgs-dilaton coupling: Theory and cosmological applications
Hoang Ky Nguyen
We allow the Higgs field to interact with a dilaton field of the background spacetime via the coupling . Upon spontaneous gauge symmetry breaking, the Higg…
Time-reversed information flow through a wormhole in scalar-tensor gravity
Hoang Ky Nguyen, Francisco S. N. Lobo
This Letter aims to advance unexplored properties of a new class of Closed Timelike Curves recently discovered in scalar-tensor gravity, reported in Universe 9, 467 (2023) and Eur.…
Observational test of spacetimes with the S2 star in the Milky Way galactic center
Jian-Ming Yan, Tao Zhu, Mustapha Azreg-Aïnou +2
A novel class of vacuum metrics expressible in analytical form was recently found for pure gravity, based on a groundwork put forth by Buchdahl in 1962. These Buchda…
Observational tests of asymptotically flat spacetimes
Tao Zhu, Hoang Ky Nguyen, Mustapha Azreg-Aïnou +1
A novel class of Buchdahl-inspired metrics with closed-form expressions was recently obtained based on Buchdahl's seminal work on searching for static, spherically symmetric metric…