Ky Van Pham

activity

20222026

f (R)

-gravitation in FLRW cosmology

6 citations · 10 across the 3 of their papers we have counts for

collaborators

3 papers

physics.gen-ph2026

Metric Variation of the Energy-Momentum Tensor of a Perfect Fluid and Its Applications to Cosmology and Neutron Stars

Pham Van Ky

We show that the expressions for the matter Lagrangian $L_m$ and the metric variation $δT_{μν}$ of a perfect fluid obtained in previous studies appear to be inconsistent with t…

gr-qc2024★ 4 cited

Gravitational radiation of a spherically symmetric source in $f (R)$ -gravitation

Pham Van Ky, Nguyen Thi Hong Van, Nguyen Anh Ky

It is shown that Birkhoff's theorem for the general theory of relativity is overcome in the $f (R)$ -theory of gravitation. That means, the $f (R)$ -theory of gravitation, unlike Einst…

gr-qc2022★ 6 cited

Perturbative approach to $f (R)$ -gravitation in FLRW cosmology

Pham Van Ky, Nguyen Thi Hong Van, Nguyen Anh Ky

The $f (R)$ theory of gravitation developed perturbatively around the general theory of relativity with cosmological constant (the \text{ $Λ$ }CDM model) in a flat FLWR geometry is co…

Metric Variation of the Energy-Momentum Tensor of a Perfect Fluid and Its Applications to Cosmology and Neutron Stars

Gravitational radiation of a spherically symmetric source in f(R)-gravitation

Perturbative approach to f(R)-gravitation in FLRW cosmology

Gravitational radiation of a spherically symmetric source in $f (R)$ -gravitation

Perturbative approach to $f (R)$ -gravitation in FLRW cosmology