398 citations · 2.3k across the 58 of their papers we have counts for
58 papers
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…
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…
Non-universal SUSY models, , and dark matter
John Ellis, Keith A. Olive, Vassilis C. Spanos
We study the anomalous magnetic moment of the muon, , in the context of supersymmetric models beyond the CMSSM, where the unification of either the gaugino mas…
Freeze-in baryogenesis and early matter domination
Ioannis Dalianis, Andreas Goudelis, Dimitrios Karamitros +2
The freeze-in mechanism has been shown to allow the simultaneous generation of cosmic dark matter and a viable matter-antimatter asymmetry in the universe. When the underlying inte…
The CMSSM Survives Planck, the LHC, LUX-ZEPLIN, Fermi-LAT, H.E.S.S. and IceCube
John Ellis, Keith A. Olive, Vassilis C. Spanos +1
We revisit the viability of the CMSSM, searching for regions of parameter space that yield a neutralino dark matter density compatible with Planck measurements, as well as LHC cons…
Primordial Black Holes and Gravitational Waves in Multi-Axion-Chern-Simons Inflation
Nick E. Mavromatos, Vassilis C. Spanos, Ioanna D. Stamou
We study aspects of inflation and the possibility of enhanced production of primordial black holes (PBHs) and gravitational waves (GWs) in a string-inspired model of two axion fiel…