Effective Actions for Heterotic M-Theory

@article{Lehners2006EffectiveAF,
  title={Effective Actions for Heterotic M-Theory},
  author={Jean-Luc Lehners and Paul McFadden and Neil Turok},
  journal={Physical Review D},
  year={2006},
  volume={76}
}
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… 

Figures from this paper

Perturbative antibrane potentials in heterotic M theory

We derive the perturbative four-dimensional effective theory describing heterotic M theory with branes and antibranes in the bulk space. The backreaction of both the branes and antibranes is

On Newton's law in supersymmetric braneworld models

We study the propagation of gravitons within 5-D supersymmetric braneworld models with a bulk scalar field. The setup considered here consists of a 5-D bulk spacetime bounded by two 4-D branes

Heterotic Braneworld Gravity

In the past decade, there has been considerable interest in braneworld scenarios where the universe lives on a brane in a higher-dimensional bulk and gravity is modified. The heterotic braneworld

Line Bundle Hidden Sectors for Strongly Coupled Heterotic Standard Models

We review the compactification to five‐dimensional heterotic M‐theory on a Schoen Calabi–Yau threefold and the specific SU(4) vector bundle leading to the “heterotic standard model” in the observable

Supersymmetric Galileons

Galileon theories are of considerable interest since they allow for stable violations of the null energy condition. Since such violations could have occurred during a highenergy regime in the history

Tunneling with negative tension

We describe a new family of thin-wall instantons, with negative tension bubble walls, that mediate tunneling between Minkowski or de Sitter vacua. Some of these instantons can have exponentially

Quantum circuit complexity of primordial perturbations

We study the quantum circuit complexity of cosmological perturbations in different models of the early universe. A natural measure for the complexity of cosmological perturbations is based on the

Alternatives to Inflation – non-minimal ekpyrosis and conflation

In this thesis we explore cosmological models of the early universe, in particular alternatives to the theory of inflation. In the first part of this thesis, we derive the evolution equations for two

Multifield cosmological perturbations at third order and the ekpyrotic trispectrum

Using the covariant formalism, we derive the equations of motion for adiabatic and entropy perturbations at third order in perturbation theory for cosmological models involving two scalar fields. We