It is challenging to construct explicit and controllable models that realize de Sitter solutions in string compactifications. This difficulty the main motivation for Refined Conjecture Trans-Planckian Censorship which forbid stable but allow metastable, unstable rolling a theory consistent with quantum gravity. Inspired by this, we first study toy No-Scale Supergravity model show particular cho...

A bstract We study whether the universal runaway behaviour of stringy scalar potentials towards infinite field distance limits can produce an accelerated expanding cosmology à la quintessence. identify a loophole to some proposed bounds that forbid such asymptotic (at parametric control) expansion in 4d $$ \mathcal{N} N ...

We discuss some aspects of swampland constraints - especially the distance conjecture in a large number space-time dimensions $D$. analyze Kaluza-Klein (KK) states at $D$ and find that KK spectra possess an interesting dependence on On basis these observations we propose new dimension conjecture. apply it to compactifications anti-de Sitter backgrounds where predicts upper bound as function its...

In this work we shall study a class of $f(R,\phi)$ gravity models which during the inflationary era, is large curvature regime, result to an effective Lagrangian that contains rescaled Einstein-Hilbert term $\alpha R$ in presence canonical minimally coupled scalar field. The dimensionless parameter $\alpha$ chosen take values range $0<\alpha<1$ and main motivation for studying these gravities, ...

A bstract Many interesting questions about F-theory models, including several concerning the swampland, involve massless matter charged under U(1) gauge symmetries. It is therefore important to better understand geometric properties of models realizing various charges. We propose that, for described by elliptic fibrations in Weierstrass form, charge light encoded orders vanishing section compon...

A bstract The Swampland Distance Conjecture (SDC) restricts the geodesic distances that scalars can traverse in effective field theories as they approach points at infinite distance moduli space. We propose that, when applied to subset of light fields with scalar potentials, SDC amount non-geodesicity allowed for trajectories along valleys potential. This is necessary ensure consistency a valid...