COLLEGE PARK, Maryland, March 1 -- Physical Review D, a journal that says it covers particles, fields, gravitation and cosmology from the American Physical Society, published research articles on the following topics in its Feb. 15, 2024, edition (Vol. 109, Issue 4).

Here are excerpts:

LETTERS:

* Gamma-ray lines in 15 years of Fermi-LAT data: New constraints on Higgs portal dark matter

* Curvature of the energy per particle in neutron stars