Year: 2010
Type: article
Abstract: We give an explicit realization of the “StringAxiverse” discussed in Arvanitaki et. al [ 1 ] by extending our previous results on moduli stabilization in M theory to include axions. We extend the analysis of [ 1 ] to allow for high scale inflation that leads to a moduli dominated pre-BBN Universe. We demonstrate that an axion which solves the strong-CP problem naturally arises and that both the axion decay constants and GUT scale can consistently be around 2 × 10 16 GeV with a much smaller fine tuning than is usually expected. Constraints on the Axiverse from cosmological observations, namely isocurvature perturbations and tensor modes are described. Extending work of Fox et. al [ 2 ], we note that the observation of tensor modes at Planck will falsify the Axiverse completely. Finally we note that Axiverse models whose lightest axion has mass of order 10 −15 eV and with decay constants of order 5 × 10 14 GeV require no (anthropic) fine-tuning, though standard unification at 10 16 GeV is difficult to accommodate.
Source: Journal of High Energy Physics
Authors: Bobby Samir Acharya, Konstantin Bobkov, Piyush Kumar
Institutions: The Abdus Salam International Centre for Theoretical Physics (ICTP), University of Michigan, Michigan Center for Translational Pathology, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, University of California, Santa Barbara, Kavli Institute for Theoretical Physics, The Ohio State University, Lawrence Berkeley National Laboratory, University of California, Berkeley
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid:
OpenAlex ID: W1964818385