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hep-ph2013★ 5 cited
Stabilizing the Semilocal String with a Dilatonic Coupling
Leandros Perivolaropoulos, Nikos Platis
We demonstrate that the stability of the semilocal vortex can be significantly improved by the presence of a dilatonic coupling of the form e^\frac{q | Φ|^2}{η^2} F_{μν}F^{μν} with…
astro-ph.CO2013★ 117 cited
Observational constraints on viable f(R) parametrizations with geometrical and dynamical probes
Spyros Basilakos, Savvas Nesseris, Leandros Perivolaropoulos
We demonstrate that a wide range of viable f(R) parameterizations (including the Hu & Sawicki and the Starobinsky models) can be expressed as perturbations deviating from the LCDM…