Speaker
Description
Abstract
Non-minimally coupled scalar theories can be written in a Jordan frame, where the scalar field couples directly to curvature, or in an Einstein frame, where gravity is canonical but the scalar sector is transformed. We ask whether an oscillon identified in one frame remains an oscillon after transforming to the other frame and taking the nonrelativistic limit, given conformal and field redefinitions can change the apparent mass, radius, frequency, profile, and higher-harmonic content.
We investigate how a Jordan-Einstein dictionary should be constructed for nonrelativistic oscillon configurations. In particular, we examine when the frame transformation and the nonrelativistic truncation commute, and what consistency conditions are needed for localization, submass oscillation frequency, and power counting to be preserved. We also discuss how mass-radius relations should be compared across frames, emphasizing that raw quantities such as M and R are frame-dependent, while dimensionless combinations such as mR, omega/m, and compactness-type variables are better candidates for frame-covariant diagnostics.