A bstract We investigate interactions between branes of various dimensions, both charged and uncharged, in three non-supersymmetric string models. These include the USp(32) U(32) orientifold projections type IIB 0B strings, as well SO(16) × projection exceptional heterotic string. The resulting ten-dimensional spectra are free tachyons, combinations that they contain give rise to rich varied dy...

Local determinations of the Hubble constant $H_0$ favour a higher value than Planck based on CMB and $\Lambda$CDM. Through model-independent expansion, we show that low redshift ($z \lesssim 0.7$) data comprising baryon acoustic oscillations (BAO), cosmic chronometers Type Ia supernovae has preference for Quintessence models lower relative to In addition, confirm an exponential coupling dark ma...

In recent times, a considerable effort has been dedicated to identify certain conditions---the so-called swampland conjectures---with an eye on identifying effective theories which have no consistent UV-completions in string theory. this paper, we examine the anti--de Sitter vacua corresponding solutions arise from purely nonperturbative contributions superpotential and show that these satisfy ...

In this paper, we study a hybrid combination of Einstein–Hilbert action with curvature scalar R, and function f(R) in Palatini gravity within the context inflationary scenario, from Swampland conjecture point view. This model has been paid attention recent cosmological studies, its applications have widely studied literature. regard, using (using (C1) as first component dS swampland conjecture,...

We consider the conditions necessary for obtaining perturbative maximal supergravity in d dimensions as a decoupling limit of type II superstring theory compactified on a (10 − d)-torus. For dimensions d = 2 and d = 3 it is possible to define a limit in which the only finite-mass states are the 256 massless states of maximal supergravity. However, in dimensions d ≥ 4 there are infinite towers o...