In this talk we discuss various aspects of the effective dynamics of Maxwell-Einstein scalar theories in the background of static, spherically symmetric and extremal black hole solution in (1+3) dimensions. We show that the effective one dimensional action (governed by the Attractor mechanism) from which the effective black hole potential (introduced by Ferrara-Gibbons-Kallosh) is usually...
In this talk, I will discuss on-shell actions for type IIB supergravity and 11D M-Theory based on my recent papers (JHEP 06 (2026) 271 and 260X.XXXXX). In these works, we have consistently incorporated suitable topological terms that can be evaluated for a
large number of backgrounds. We also show that the on-shell actions for the original 10D and 11D supergravities obtained in our papers...
We present a perturbative construction of the Nicolai map for four-dimensional N = 1 pure supergravity around flat Minkowski space, as an alternative to the coupling-flow-operator approach. Using the second-order formalism and the background-field expansion of the vielbein in the gravitational coupling κ, we derive the on-shell BRST structure and formulate the defining conditions for a Nicolai...
