Lectures on Naturalness, String Landscape and Multiverse
arXiv:2008.10625
Abstract
The cosmological constant and electroweak hierarchy problem have been a great inspiration for research. Nevertheless, the resolution of these two naturalness problems remains mysterious from the perspective of a low-energy effective field theorist. The string theory landscape and a possible string-based multiverse offer partial answers, but they are also controversial for both technical and conceptual reasons. The present lecture notes, suitable for a one-semester course or for self-study, attempt to provide a technical introduction to these subjects. They are aimed at graduate students and researchers with a solid background in quantum field theory and general relativity who would like to understand the string landscape and its relation to hierarchy problems and naturalness at a reasonably technical level. Necessary basics of string theory are introduced as part of the course. This text will also benefit graduate students who are in the process of studying string theory at a deeper level. In this case, the present notes may serve as additional reading beyond a formal string theory course.
Author version of a book published by Springer, 274 pages LaTeX, 52 figures, v2: errors corrected, references added, v3/v4/v5: further corrections
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- Cosmological Relaxation of the Electroweak Scale
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- Higgs as a Holographic Pseudo-Goldstone Boson
- The Anthropic Landscape of String Theory
- Toward Realistic Intersecting D-Brane Models
- Distributions of flux vacua
- The Inflationary Brane-Antibrane Universe
- Completing Natural Inflation
- Supersymmetry Breaking and alpha'-Corrections to Flux Induced Potentials
- The type IIB string axiverse and its low-energy phenomenology
- The String Landscape and the Swampland
- Soft Supersymmetry Breaking in KKLT Flux Compactification
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- Nnaturalness
- Natural Inflation and Quantum Gravity
- de-Sitter vacua via consistent D-terms
- Planckian Axions and the Weak Gravity Conjecture
- D7-Brane Chaotic Inflation
- D-Branes at del Pezzo Singularities: Global Embedding and Moduli Stabilisation
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- The Multiverse Interpretation of Quantum Mechanics
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- Inflation and the Theory of Cosmological Perturbations
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- A Critique of the Asymptotic Safety Program
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- Towards de Sitter from 10D
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- Black Hole Formation and Classicalization in Ultra-Planckian 2 -> N Scattering
- The -MSSM - An Theory motivated model of Particle Physics
- The tension between 10D supergravity and dS uplifts
- Cosmological Higgs-Axion Interplay for a Naturally Small Electroweak Scale
- Vacua with Small Flux Superpotential
- Supersymmetry Breaking in the Anthropic Landscape
- Magnetized E3-brane instantons in F-theory
- Properties of the scale factor measure
- Large Hierarchies from Attractor Vacua
- Statistical analysis of the supersymmetry breaking scale
- Relaxion Monodromy and the Weak Gravity Conjecture
- New Attractors and Area Codes
- Cosmic Attractors and Gauge Hierarchy
- Life at the Interface of Particle Physics and String Theory
- Stabilizing All Geometric Moduli in Heterotic Calabi-Yau Vacua
- Giant Tachyons in the Landscape
- The Weak Gravity Conjecture and Effective Field Theory
- Bayesian approach and Naturalness in MSSM analyses for the LHC
- Eternal Symmetree
- Probabilities in the Bousso-Polchinski multiverse
- Self-Completeness of Einstein Gravity
- Two Lectures on Technicolor
- Evidence for the Multiverse in the Standard Model and Beyond
- Cosmological solutions of supercritical string theory
- TASI Lectures on Electroweak Symmetry Breaking from Extra Dimensions
- On the Inconsistency of Fayet-Iliopoulos Terms in Supergravity Theories
- Almost No-Scale Supergravity
- Natural Quintessence in String Theory
- A Shift Symmetry in the Higgs Sector: Experimental Hints and Stringy Realizations
- A small weak scale from a small cosmological constant
- Lectures on complex geometry, Calabi-Yau manifolds and toric geometry
- Midi-review: Status of weak scale supersymmetry after LHC Run 2 and ton-scale noble liquid WIMP searches
- Five lectures on effective field theory
- Three-Form Gauging of axion Symmetries and Gravity
- A 10d view on the KKLT AdS vacuum and uplifting
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- What is the No-Boundary Wave Function of the Universe?
- Complementarity in the Multiverse
- SUSY breaking mediation by throat fields
- The effective action of D6-branes in N=1 type IIA orientifolds
- Brane/antibrane dynamics and KKLT stability
- GUT Physics in the era of the LHC
- Asymptotic safety, string theory and the weak gravity conjecture
- Supersymmetric Protection and the Swampland
- Inflating to the Weak Scale
- Quantified naturalness from Bayesian statistics
- Les Houches Lectures on Warped Models and Holography
- The dS swampland conjecture with the electroweak symmetry and QCD chiral symmetry breaking
- Relaxation of the Cosmological Constant
- Relaxing the Cosmological Constant: a Proof of Concept
- Vacuum Selection from Cosmology on Networks of String Geometries
- Quantum scale symmetry
- Eternal inflation predicts that time will end
- The Calabi-Yau Landscape: from Geometry, to Physics, to Machine-Learning
- A Finite Landscape?
- Kähler moduli stabilization from ten dimensions
- The Half-composite Two Higgs Doublet Model and the Relaxion
- A landscape solution to the SUSY flavor and CP problems
- Gaugino Condensation and Geometry of the Perfect Square
- Flavour Physics and CP Violation
- CMSSM, naturalness and the "fine-tuning price" of the Very Large Hadron Collider
- The Static Quantum Multiverse
- Geometric origin of coincidences and hierarchies in the landscape
- The Landscape "avant la lettre"
- Musings on cosmological relaxation and the hierarchy problem
- Fluxbranes: Moduli Stabilisation and Inflation
- TASI 2004 Lectures on the Phenomenology of Extra Dimensions
- TASI Lectures on Dark Matter
- Axion detection via Topological Casimir Effect
- Vacua Morghulis
- Unstoppable brane-flux decay of branes
- The Census Taker's Hat
- Thermal Dark Energy
- A Goldilocks Higgs
- Lectures on Higgs Boson Physics in the Standard Model and Beyond
- Mass Hierarchy and Vacuum Energy
- Gauging Fine-Tuning
- Cargese Lectures on Extra Dimensions
- Cosmological constant: relaxation vs multiverse
- A Simple System For Coleman-De Luccia Transitions
- Renormalization in quantum theories of geometry
- Electroweak Symmetry Breaking in Warped Extra Dimensions
- Lectures on Flavor Physics and CP Violation