pseudodilaton

A pseudodilaton is a hypothetical scalar field that appears in certain theories of physics, particularly in the context of string theory and supergravity. It is often associated with compactifications of higher-dimensional theories to lower dimensions, where it plays a role in determining the shape and size of the compactified dimensions.

The term "pseudodilaton" is derived from its similarity to the dilaton field, which is a scalar field that appears in string theory and is associated with the string coupling constant. However, unlike the dilaton, the pseudodilaton is not directly related to the string coupling constant and has different transformation properties under duality symmetries.

In many theories, the pseudodilaton is massless and interacts with other fields in a way that is determined by its coupling to the curvature of the compactified dimensions. It can also appear in the low-energy effective action of string theory, where it contributes to the potential energy landscape and can influence the dynamics of the theory.

The pseudodilaton has been studied in various contexts, including in the context of moduli stabilization, where it can play a role in fixing the values of the moduli fields that determine the shape and size of the compactified dimensions. It has also been studied in the context of cosmology, where it can contribute to the dynamics of the early universe and the evolution of cosmic structure.

Despite its importance in certain theories, the pseudodilaton remains a relatively poorly understood field, and many of its properties and interactions are still the subject of ongoing research.