absorb.md

Tamara Winter

Chronological feed of everything captured from Tamara Winter.

paper / tamarawinter / Jun 10

Bespoke-Card: Synthesizing Workload-Specific Cardinality Estimators with Agent-Driven Code Generation

Bespoke-Card is an agent-driven system that synthesizes workload-specific cardinality estimators, addressing the limitations of generic estimators in database query optimization. It employs planning, coding, and validation agents, utilizing structured feedback and a curriculum for error isolation. This approach significantly reduces PostgreSQL runtime and q-error on the JOB benchmark, offering a new direction alongside traditional and learned estimators.

database-cardinality-estimationquery-optimizationai-driven-code-generationsqlpostgresqlsynthesizing-estimators
“Bespoke-Card synthesizes workload-specific cardinality estimators as executable code using an agent-driven system.”
paper / tamarawinter / Jun 10

Tensor Decomposition of Energy-Momentum Correlators: A Path to Efficient Lattice QCD Calculations

Moore and Winter derive the general functional form of the energy-momentum tensor two-point function in Euclidean coordinate space at both zero and finite temperature. They decompose the full correlator into fundamental tensorial structures based on residual rotational symmetry, then use energy-momentum conservation to derive differential relations linking component functions. The key result is that the full set of component functions can be represented by a smaller set of spectral functions, enabling more efficient lattice QCD computations of transport coefficients like shear and bulk viscosity.

high-energy-physicstensor-decompositioncorrelation-functionslattice-simulationstheoretical-physics
“The full energy-momentum tensor two-point function can be decomposed into fundamental tensorial structures based on residual rotational symmetry at zero and finite temperature.”