String Theory, Space-Time Non-Commutativity and Structure Formation

Robert Brandenberger

Submitted on 19 March 2007


A natural consequence of string theory is a non-commutative structure of space-time on microscopic scales. The existence of a minimal length, and a modification of the effective field theory are two consequences of this space-time non-commutativity. I will first explore some consequences of the modifications of the effective field theory for structure formation in the context of an inflationary cosmology. Then, I will explore the possibility that the existence of a minimal length will lead to a structure formation scenario different from inflation. Specifically, I will discuss recent work on string gas cosmology.


Comment: 12 pages, 2 figures, based on an invited talk at the 21st Nishinomiya-Yukawa Memorial Symposium, Nov. 11 - 16, 2006, to be publ. in the proceedings (Prog. Theor. Phys. Suppl.)

Subjects: High Energy Physics - Theory; Astrophysics; General Relativity and Quantum Cosmology; High Energy Physics - Phenomenology