Classical moduli hair for Kerr black holes in String Gravity
We compute the external moduli and dilaton hair to $O(α')$ in the framework of the one-loop corrected superstring effective action for a rotating black hole background.
hep-th↗
arXiv subjects
K. Tamvakis
Publications and source records attributed to K. Tamvakis.
Low Energy Thresholds and the Renormalization Group in the MSSM
We derive the 1-loop Renormalization Group Equations for the parameters of the Minimal Supersymmetric Standard Model (MSSM) taking into account the successive decoupling of each sparticle below its threshold. This is realized by a step function at the level of each graph contributing to the Renormalization Group Equations.
hep-ph↗
On the existence of singularity-free solutions in quartic gravity
We study a general field theory of a scalar field coupled to gravitation through a quadratic Gauss-Bonnet term $ξ(ϕ)$$R_{GB}^2$. We show that, under mild assumptions about the function $ξ(ϕ)$, the classical solutions in a spatially flat FRW background include singularity - free solutions.
gr-qc↗
One loop corrections to the Neutralino sector and Radiative Electroweak Breaking in the MSSM
We compute one loop radiative corrections to the physical neutralino masses in the MSSM considering the dominant top-stop contributions. We present a numerical renormalization group analysis of the feasibility of the radiative gauge symmetry breaking parametrized by the standard soft supersymmetry breaking terms. Although the above computed effects can be in principle large for extreme values of the Yukawa couplings, they do not in general exceed a few per cent for most of the parameter space. Therefore tree level constraints imposed on the gluino mass $m_{\tilde{g}}$ and on the superpotential parameter $μ$ by LEP1 and CDF experiments, are not upset by the heavy top-stop sector.
hep-ph↗
Singularity-free cosmological solutions of the superstring effective action
We study the cosmological solutions of the one loop corrected superstring effective action, in a Friedmann-Robertson-Walker background, and in the presence of the dilaton and modulus fields. A particularly interesting class of solutions is found which avoid the initial singularity and are consistent with the perturbative treatment of the effective action.
hep-th↗