Siddharth Kumar Sahoo

1 Introduction Controlling the 3D morphology of crystals is a longstanding challenge in materials science, with profound implications for optimizing optical, mechanical, and electronic properties [1-8]. While synthetic crystallization methods often struggle to precisely dictate crystal shape and growth direction, biological systems routinely produce crystals with highly specific morphologies tailored to their function (Figure 1) [9-22].

Einstein-Maxwell-dilaton-axion (EMDA) gravity provides a simple framework to investigate the signatures of string theory. The axion and the dilaton fields arising in EMDA gravity have important implications in inflationary cosmology and in addressing the late time acceleration of the Universe. It is therefore instructive to explore the implications of such a model in explaining the astrophysical observations.