Aspects of superstring cosmology are reviewed with an emphasis on the cosmological
implications of duality symmetries in the theory. The string effective actions are summarized …

We survey on-shell and off-shell higher derivative supergravities in dimensions 1≤ D≤ 11.
Various approaches to their construction, including the Noether procedure,(harmonic) …

We show that D-branes, extended objects defined by mixed Dirichlet-Neumann boundary
conditions, break half the supersymmetries of the type II superstring and carry a complete set …

The past two decades have seen transformative advances in cosmology and string theory.
Observations of the cosmic microwave background have revealed strong evidence for …

A bstract It has been conjectured that in theories consistent with quantum gravity infinite
distances in field space coincide with an infinite tower of states becoming massless …

A bstract In the Emergence Proposal in Quantum Gravity it is conjectured that all light-
particle kinetic terms are absent in the fundamental ultraviolet theory and are generated by …

A bstract As a refinement of the Swampland Distance Conjecture, we propose that a
quantum gravitational theory in an infinite distance limit of its moduli space either …

This is an introduction to the properties of D-branes, topological defects in string theory on
which string endpoints can live. D-branes provide a simple description of various …

A bstract We test various conjectures about quantum gravity for six-dimensional string
compactifications in the framework of F-theory. Starting with a gauge theory coupled to …

A long-standing puzzle about the heterotic string has been what happens when an instanton
shrinks to zero size. It is argued here that the answer at the quantum level is that an extra SU …