COLLEGE PARK, Maryland, June 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 May 15, 2024, edition (Vol. 109, Issue 10).

Here are excerpts:

HIGHLIGHTED ARTICLES:

* Ultrahigh frequency primordial gravitational waves beyond the kHz: The case of cosmic strings

* Dark matter annihilation and pair-instabil . . .

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