Effective Actions for Heterotic M-Theory

Abstract

We discuss the moduli space approximation for heterotic M-theory, both for the minimal case of two boundary branes only, and when a bulk brane is included. The resulting effective actions may be used to describe the cosmological dynamics in the regime where the branes are moving slowly, away from singularities. We make use of the recently derived colliding branes solution to determine the global structure of moduli space, finding a boundary at which the trajectories undergo a hard wall reflection. This has important consequences for the allowed moduli space trajectories, and for the behaviour of cosmological perturbations in the model.

21 pages, 4 figures. References added and some discussions clarified

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• Intuitive understanding of non-gaussianity in ekpyrotic and cyclic models
• Non-Singular Bouncing Cosmology: Consistency of the Effective Description
• Cosmic Bounces and Cyclic Universes
• Planck 2013 results support the cyclic universe
• Ekpyrotic Non-Gaussianity -- A Review
• Multifield Cosmological Perturbations at Third Order and the Ekpyrotic Trispectrum
• Dark Energy and the Return of the Phoenix Universe
• Non-Gaussianity Generated by the Entropic Mechanism in Bouncing Cosmologies Made Simple
• Cycles in the Multiverse
• Modulated Perturbations from Instant Preheating after new Ekpyrosis
• Bouncing Negative-Tension Branes
• Converting entropy to curvature perturbations after a cosmic bounce
• Quantum Circuit Complexity of Primordial Perturbations
• The Non-Minimal Ekpyrotic Trispectrum
• Perturbative Anti-Brane Potentials in Heterotic M-theory
• Diversity in the Phoenix Universe
• Dynamical Selection of the Primordial Density Fluctuation Amplitude
• On Newton's law in supersymmetric braneworld models
• Line Bundle Hidden Sectors for Strongly Coupled Heterotic Standard Models
• Holographic Cosmology from a System of M2-M5 Branes
• Hidden Sectors from Multiple Line Bundles for the $B-L$ MSSM
• On black holes in heterotic braneworlds