V. Spanos

activity

20242026

collaborators

3 papers

hep-ph2026

Gravitino Freeze-In Dark Matter with an Additional Scalar Field

Georgios Georgilas, Vassilis C. Spanos

The gravitino is a prominent example of a freeze-in dark matter candidate. Its relic abundance depends on the reheating temperature and on supersymmetry-breaking parameters, that i…

hep-ph2025

Gravitino Thermal Production, Dark Matter, and Reheating of the Universe

Helmut Eberl, Ioannis D. Gialamas, Vassilis C. Spanos

We present a full one-loop calculation of the gravitino thermal production rate, beyond the so-called hard thermal loop approximation, using the corresponding thermal spectral func…

hep-ph2024

Non-universal SUSY models, $g_{I^} ¼ - 2$ , $m_{H}$ and dark matter

John Ellis, Keith A. Olive, Vassilis C. Spanos

We study the anomalous magnetic moment of the muon, $g_{I^} ¼ - 2 \equiv 2 a_{I^} ¼$ , in the context of supersymmetric models beyond the CMSSM, where the unification of either the gaugino m…

Gravitino Freeze-In Dark Matter with an Additional Scalar Field

Gravitino Thermal Production, Dark Matter, and Reheating of the Universe

Non-universal SUSY models, gI^​¼−2, mH​ and dark matter

Non-universal SUSY models, $g_{I^} ¼ - 2$ , $m_{H}$ and dark matter