A proposal is made for a cosmological D3/D7 model with constant magnetic flux along the D7 world-volume. It describes an N=2 gauge Fayet-Iliopoulos terms and potential of hybrid P-term inflation. The motion D3-brane towards in phase spontaneously broken supersymmetry provides period slow-roll inflation de Sitter valley, role inflaton being played by distance between D3 D7-branes. After tachyon condensation supersymmetric ground state formed: bound corresponding to Abelian non-linear...

Recently a swampland criterion has been proposed that rules out de Sitter vacua in string theory. Such should hold at all points the field space and especially where system is on-shell. However there not any attempt to examine against explicit equations of motion. In this paper we study four-dimensional quasi-de solutions using dimensionally reduced M-theory. While on one hand classical sources could allow for with isometries are ruled out, quantum corrections, other hand, found provided...

We revisit the classical theory of ten-dimensional two-derivative gravity coupled to fluxes, scalar fields, D-branes, anti D-branes and Orientifold-planes. show that such set-ups do not give rise a four-dimensional positive curvature spacetime with isometries de Sitter spacetime. further argue solution in type IIB may still be achieved if higher-order corrections are carefully controlled. Our analysis relies on derivation condition from an explicit background by going beyond supergravity...

The late-time behavior of our universe is one accelerated expansion, or that a de Sitter space, and therefore motivates us to look for time-dependent backgrounds. Finding such backgrounds in string theory has always been challenging problem. An even harder problem find allow positive dark energies. As first step handle scenarios, we study background type IIB theory, with four-dimensional isometries, by uplifting it M-theory then realizing as coherent, squeezed-coherent, state over an...

Glauber-Sudarshan states, sometimes simply referred to as Glauber or alternatively coherent and squeezed-coherent are interesting states in the configuration spaces of any quantum field theories, that closely resemble classical trajectories space-time. In this paper, we identify four-dimensional de Sitter space a state over supersymmetric Minkowski vacuum. Although such an identification is not new, what new however claim realizable full string theory, but only conjunction with temporally...

The gravity duals of nonlocal field theories in the large N limit exhibit a novel behavior near boundary. To explore this, we present and study dipole - particular class with fundamental fields. interactions are manifest metric dual type-0 string make surprising appearance. We compare situation to that noncommutative SYM.

A bstract We show that four-dimensional de Sitter space is a Glauber-Sudarshan state, i.e. coherent over supersymmetric solitonic background in full string theory. argue such state only realized the presence of temporally varying degrees freedom and after including quantum corrections, with supersymmetry being broken spontaneously. On other hand, fluctuations resulting governed by Agarwal-Tara which graviton (and flux)-added state. Once as not vacuum, its ability to remain out swampland well...

We elaborate on the brane configuration that gives rise to a QCD-like gauge theory confines at low energies and becomes scale invariant highest energies. In limit where rank of group is large, gravitational description emerges. For confined phase, we obtain vector meson spectrum demonstrate how certain choice parameters can lead quantitative agreement with empirical data.