Nuclear Astrophysics of Worlds in the String Landscape

Abstract

Motivated by landscape models in string theory, cosmic nuclear evolution is analyzed allowing the Standard Model Higgs expectation value w to take values different from that in our world (w=1), while holding the Yukawa couplings fixed. Thresholds are estimated, and astrophysical consequences are described, for several sensitive dependences of nuclear behavior on w. The dependence of the neutron-proton mass difference on w is estimated based on recent calculations of strong isospin symmetry breaking, and is used to derive the threshold of neutron-stable worlds, w ~ 0.6+/- 0.2. The effect of a stable neutron on nuclear evolution in the Big Bang and stars is shown to lead to radical differences from our world, such as a predominance of heavy r-process and s-process nuclei and a lack of normal galaxies, stars and planets. Rough estimates are reviewed of w thresholds for deuteron stability and the pp and pep reactions dominant in many stars. A simple model of nuclear resonances is used to estimate the w dependence of overall carbon and oxygen production during normal stellar nucleosynthesis; carbon production is estimated to change by a fraction ~15(1-w). Radical changes in astrophysical behavior seem to require changes in w of more than a few percent, even for the most sensitive phenomena.

arXiv comment11 pages, Latex, to appear in Phys. Rev. D

References in corpus (31)

• de Sitter Vacua in String Theory
• Hierarchies from Fluxes in String Compactifications
• Quantization of Four-form Fluxes and Dynamical Neutralization of the Cosmological Constant
• The fundamental constants and their variation: observational status and theoretical motivations
• A New Expansion for Nucleon-Nucleon Interactions
• The statistics of string/M theory vacua
• Distributions of flux vacua
• Dimensionless constants, cosmology and other dark matters
• Counting Flux Vacua
• The anthropic principle and the mass scale of the Standard Model
• Why the Universe is Just So
• Is There A String Theory Landscape
• The Quark-Mass Dependence of Two-Nucleon Systems
• Variation of Fundamental Couplings and Nuclear Forces
• Anthropic considerations in multiple domain theories and the scale of electroweak symmetry breaking
• Cosmological variation of deuteron binding energy, strong interaction and quark masses from big bang nucleosynthesis
• Time-varying coupling strengths, nuclear forces and unification
• Cosmic Attractors and Gauge Hierarchy
• Strong-Isospin Violation in the Neutron-Proton Mass Difference from Fully-Dynamical Lattice QCD and PQQCD
• A Universe Without Weak Interactions
• Nucleosynthesis and the variation of fundamental couplings
• The Cold Big-Bang Cosmology as a Counter-example to Several Anthropic Arguments
• Constraining the variation of the coupling constants with big bang nucleosynthesis
• Big Bang nucleosynthesis and cosmic microwave background constraints on the time variation of the Higgs vacuum expectation value
• A Calculable Toy Model of the Landscape
• The Triple-Alpha Process and the Anthropically Allowed Values of the Weak Scale
• The Effect of Bound Dineutrons upon BBN
• Bridging the mass gaps at A=5 and A=8 in nucleosynthesis
• The Effect of Time Variation in the Higgs Vacuum Expectation Value on the Cosmic Microwave Background
• Fine-tuning the basic forces of nature through the triple-alpha process in red giant stars
• Time Variation of Fundamental Constants as a Probe of New Physics

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• Varying constants, Gravitation and Cosmology
• Sinks in the Landscape, Boltzmann Brains, and the Cosmological Constant Problem
• Living Dangerously with Low-Energy Supersymmetry
• Life at the Interface of Particle Physics and String Theory
• A Universe Without Weak Interactions
• Evidence for the Multiverse in the Standard Model and Beyond
• The Weak Scale from BBN
• The Degree of Fine-Tuning in our Universe -- and Others
• The Intermediate Scale MSSM, the Higgs Mass and F-theory Unification
• Gedanken Worlds without Higgs: QCD-Induced Electroweak Symmetry Breaking
• Higgs and superparticle mass predictions from the string theory landscape
• The Higgs mass and natural supersymmetric spectrum from the landscape
• Anthropic tuning of the weak scale and of m_u/m_d in two-Higgs-doublet models
• Producing the Deuteron in Stars: Anthropic Limits on Fundamental Constants
• Statistical Understanding of Quark and Lepton Masses in Gaussian Landscapes
• Binding the Diproton in Stars: Anthropic Limits on the Strength of Gravity
• Multiverse Predictions for Habitability: The Number of Stars and their Properties
• Multiverse Predictions for Habitability: Element Abundances
• A New Approach to Flavor Symmetry and an Extended Naturalness Principle
• Anthropic constraints on fermion masses
• Quark Masses: An Environmental Impact Statement