Comments On String Theory

Abstract

String theory avoids the ultraviolet infinities that arise in trying to quantize gravity. It is also more predictive than conventional quantum field theory, one aspect of this being the way that it contributed to the emergence of the concept of ``supersymmetry'' of particle interactions. There are hints from the successes of supersymmetric unified theories of particle interactions that supersymmetry is relevant to elementary particles at energies close to current accelerator energies; if this is so, it will be confirmed experimentally and supersymmetry is then also likely to be important in cosmology, in connection with dark matter, baryogenesis, and/or inflation. Magnetic monopoles play an important role in the structure of string theory, and thus should certainly exist, if string theory is correct, though they may have been diluted by inflation to an unobservable level. The monopole mass in many attractive models is near the Planck mass, but, if unification of elementary particle forces with gravity occurs near TeV energies through large or warped extra dimensions, as in some recent models, then monopoles should be below 100 TeV and in an astrophysical context would be ultrarelativistic. In such models, supersymmetry would definitely be expected at TeV energies.

10 pp, lecture at Sackler Colloquium on Challenges to the Standard Paradigm

References in corpus (2)

• A Large Mass Hierarchy from a Small Extra Dimension
• A Search for Lightly Ionizing Particles with the MACRO Detector

Cited by in corpus (50)

• Open and Closed String Interpretation of SUSY CFT's on Branes with Boundaries
• The Worldsheet Dual of the Symmetric Product CFT
• Getting just the Supersymmetric Standard Model at Intersecting Branes on the Z6-orientifold
• The complete AdS_3 x S^3 x T^4 worldsheet S-matrix
• A dynamic su(1|1)^2 S-matrix for AdS3/CFT2
• The Schwarzian Theory - A Wilson Line Perspective
• Fusion rules and logarithmic representations of a WZW model at fractional level
• Integrability, spin-chains and the AdS3/CFT2 correspondence
• Boundary States for AdS_2 Branes in AdS_3
• H^+_3 WZNW model from Liouville field theory
• Strings on ${\text{AdS}}_3\times {\text{S}}^3\times {\text{S}}^3\times {\text{S}}^1$
• String correlators on ${\text{AdS}}_3$: Three-point functions
• An introduction to quantum gravity
• Little Strings, Long Strings, and Fuzzballs
• Large-density field theory, viscosity, and "$2k_F$" singularities from string duals
• Counting Giant Gravitons in AdS_3
• Conformal Current Algebra in Two Dimensions
• String Theory on Warped AdS_3 and Virasoro Resonances
• Three-point functions in superstring theory on AdS3xS3xT4
• Asymptotic Symmetries of String Theory on AdS3 X S3 with Ramond-Ramond Fluxes
• Noncommutative Monopoles and Riemann-Hilbert Problems
• String States on AdS_3 x S^3 from the Supergroup
• Winding tachyons in BTZ
• Aspects of Stability and Phenomenology in Type IIA Orientifolds with Intersecting D6-branes
• Operator product expansion in SL(2) conformal field theory
• Large Spin Strings in AdS_3
• The plane-wave spectrum from the worldsheet
• The physical principles underpinning self-organization in plants
• Heterotic AdS_3/CFT_2 duality with (0,4) spacetime supersymmetry
• Signatures for Black Hole production from hadronic observables at the Large Hadron Collider
• Superstrings in Thermal Anti-de Sitter Space
• Twisted String Theory in Anti-de Sitter Space
• One-loop amplitudes of winding strings in AdS${}_3$ and the Coulomb gas approach
• Wrapped Fivebranes Redux
• No Ward-Takahashi identity violation for an Abelian tensorial group field theories with closure constraint
• Supersymmetric deformations of F1-NS5-branes and their exact CFT description
• Minimum length, extra dimensions, modified gravity and black hole remnants
• String Scale Thermal Anti-de Sitter Spaces
• On duality and extended chiral symmetry in the SL(2,R) WZW model
• Minimal surfaces with mixed three-form flux
• The Space-time Transformations Between Accelerated Systems
• Covariant Hamiltonian evolution in supersymmetric quantum systems
• On marginal deformation of WZNW model and PP-wave limit of deformed $Ad{S}_3\times S^3$ string geometry
• The $Ad{S}_3\times S^1$ Chiral Ring
• ${\text{AdS}}_3/{\text{CFT}}_2$ at higher genus
• The MoEDAL experiment at the LHC: status and results
• A substrate for brane shells from $T\bar{T}$
• Double Trace Deformations, Infinite Extra Dimensions and Supersymmetry Breaking
• A Preon Model Based Universe
• The physics case for the MoEDAL experiment at LHC