RT Journal Article T1 Constraining the Kahler moduli in the heterotic standard model A1 Gómez, Tomás L. A1 Lukic, Sergio A1 Sols Lucía, Ignacio AB Phenomenological implications of the volume of the Calabi-Yau threefolds on the hidden and observable M-theory boundaries, together with slope stability of their corresponding vector bundles, constrain the set of Kahler moduli which give rise to realistic compactifications of the strongly coupled heterotic string. When vector bundles are constructed using extensions, we provide simple rules to determine lower and upper bounds to the region of the Kahler moduli space where such compactifications can exist. We show how small these regions can be, working out in full detail the case of the recently proposed Heterotic Standard Model. More explicitly, we exhibit Kahler classes in these regions for which the visible vector bundle is stable. On the other hand, there is no polarization for which the hidden bundle is stable. PB Springer SN 0010-3616 YR 2007 FD 2007-11 LK https://hdl.handle.net/20.500.14352/50477 UL https://hdl.handle.net/20.500.14352/50477 LA eng DS Docta Complutense RD 6 abr 2025