Instanton Homology and Fibered Knots: 2-Torsion and Alexander Polynomial
Analysis
Key Takeaways
- •Establishes the presence of 2-torsion in the instanton homology of fibered knots.
- •Provides a formula for calculating instanton homology via sutured instanton theory.
- •Connects instanton homology to the Alexander polynomial for knots admitting lens space surgeries.
- •Shows a non-vanishing result for the next-to-top Alexander grading summand of instanton knot homology for unknotting number one knots.
- •Discusses the relation to Heegaard Floer theory.
“The paper proves that the unreduced singular instanton homology has 2-torsion for any null-homologous fibered knot (except for a specific case) and provides a formula for calculating it.”