Brane Supersymmetry Breaking and the Cosmological Constant: Open Problems

TL;DR

This paper discusses the potential of non-BPS brane world scenarios to explain the small cosmological constant, examining theoretical conditions and experimental constraints that could support or rule out this approach.

Contribution

It analyzes the conditions under which brane supersymmetry breaking can address the cosmological constant problem and highlights experimental tests relevant to superstring phenomenology.

Findings

At least two extra dimensions are required.

The supergravity mass matrix must satisfy Str M^2=0.

Experimental tests of Newton's constant at micrometer scales are crucial.

Abstract

It has recently been argued that non--BPS brane world scenarios can reproduce the small value of the cosmological constant that seems to have been measured. Objections against this proposal are discussed and necessary (but not sufficient) conditions are stated under which it may work. At least n=2 extra dimensions are needed. Also, the mass matrix in the supergravity sector must satisfy $Str M^2=0$. Moreover, the proposal can be ruled out experimentally if Newton's constant remains unchanged down to scales of 10 micrometers. If, on the other hand, such a ``running Newton constant'' is observed, it could provide crucial experimental input for superstring phenomenology.