Sigma-C Framework v2.1.0

Universal Criticality Analysis & Active Control System

Overview

Sigma-C is a framework for detecting and analyzing critical phase transitions across physical, computational, and data-driven systems. It provides a unified susceptibility-based approach: sweep a control parameter, compute the response function (susceptibility), and locate the critical point where the system transitions between qualitatively different regimes.

The core idea is simple: for any system with a tunable parameter and a measurable observable, the susceptibility chi = dO/d(epsilon) peaks at the critical point sigma_c. The sharpness of that peak (kappa) quantifies how pronounced the transition is.

Peer-Reviewed Application

The methodology behind Sigma-C has been validated in a peer-reviewed publication:

"Operational scale detection in quantum magnetism" AVS Quantum Science, Volume 8, Issue 1, Article 013804 (2026) https://doi.org/10.1116/5.0254846

This paper demonstrates the framework's application to quantum computing on real hardware (Rigetti Ankaa-3), where Sigma-C successfully identifies the critical noise threshold at which quantum algorithms lose their advantage over classical computation. The detected critical point (sigma_c = 0.070 +/- 0.009) and correlation length (xi_c = 8.00 +/- 0.50 qubits) are consistent with theoretical predictions from quantum error correction theory.

Core Capabilities

• Susceptibility Analysis: Detect critical points via chi = dO/d(epsilon) with Gaussian kernel smoothing
• Active Control: PID controller to maintain systems at or near critical points
• Streaming Computation: O(1) real-time susceptibility updates using Welford's algorithm
• Observable Discovery: Automatic identification of optimal order parameters
• Multi-Scale Analysis: Wavelet-based criticality detection across scales
• Statistical Rigor: Jonckheere-Terpstra trend tests, isotonic regression with bootstrap CI
• High-Performance Core: Optional C++ backend via pybind11, CUDA acceleration via CuPy

Domain Adapters

Domain	Adapter	Key Methods
Quantum	QuantumAdapter	Noise sweep, depth scaling, idle sensitivity, Fisher information
GPU/HPC	GPUAdapter	Cache transition detection, roofline analysis, thermal throttling
Finance	FinancialAdapter	Hurst exponent, GARCH(1,1) volatility, order flow imbalance
Climate	ClimateAdapter	Mesoscale boundary detection, vertical stability analysis
Seismic	SeismicAdapter	Gutenberg-Richter b-value, Omori aftershock scaling
Magnetic	MagneticAdapter	Critical exponents (beta, gamma, alpha), finite size scaling
ML	MLAdapter	Training robustness, learning rate sensitivity
Edge/IoT	EdgeAdapter	Power efficiency phase transitions
LLM Cost	LLMCostAdapter	Cost-quality Pareto frontier analysis

Integrations

Category	Integration	Description
Quantum	Qiskit	Circuit noise sensitivity analysis
	PennyLane	VQA criticality tracking device
	Cirq	Circuit optimization for stability
	AWS Braket	Native quantum hardware adapter
ML Frameworks	PyTorch	CriticalModule with activation tracking
	TensorFlow	SigmaCCallback for Keras training
	JAX	critical_jit decorator, CriticalOptimizer
	CUDA/CuPy	GPU-accelerated susceptibility computation
APIs	REST	FastAPI endpoint (SigmaCAPI)
	GraphQL	Strawberry + built-in zero-dep resolver
	WASM	Browser-native JS module generator
Monitoring	Grafana	Prometheus metrics export (push + pull)
	Kubernetes	Pod criticality monitoring + autoscaling
	GitHub Actions	AST-based code complexity CI gate
Finance	QuantLib	Black-Scholes with criticality adjustment
	Zipline	Crash avoidance trading strategy
Platforms	Home Assistant	Smart home criticality sensor
	VSCode	Real-time code complexity status bar
Reporting	LaTeX	Publication-ready tables, figures, reports
Bindings	Julia	SigmaC.jl native binding
	Mathematica	SigmaC.m Wolfram Language binding
	Lean 4	SigmaC.lean theorem prover binding

Installation

# Core framework
pip install sigma-c-framework

# With quantum integrations
pip install sigma-c-framework[quantum]

# With GPU acceleration
pip install sigma-c-framework[gpu]

Quick Start

Detecting a Phase Transition (Ising Model)

import numpy as np
from sigma_c import Universe

# Generate synthetic magnetization data across temperatures
temperatures = np.linspace(1.5, 3.5, 50)
Tc = 2.269  # Exact 2D Ising critical temperature
magnetization = np.where(
    temperatures < Tc,
    np.abs(Tc - temperatures)**0.125,
    0.01 * np.random.randn(np.sum(temperatures >= Tc))
)

# Find the critical point using susceptibility analysis
mag = Universe.magnetic()
result = mag.compute_susceptibility(temperatures, magnetization)

print(f"Detected Tc:    {result['sigma_c']:.3f}")
print(f"Theoretical Tc: {Tc}")
print(f"Peak sharpness: {result['kappa']:.1f}")

Quantum Noise Threshold Detection

import numpy as np
from sigma_c import Universe

qpu = Universe.quantum(device='simulator')
result = qpu.run_optimization(
    circuit_type='grover',
    epsilon_values=np.linspace(0.0, 0.25, 20),
    shots=1000
)

print(f"Critical noise level: {result['sigma_c']:.4f}")
print(f"Peak clarity (kappa): {result['kappa']:.1f}")
# Above sigma_c, Grover's algorithm loses quantum advantage

Financial Volatility Regime Detection

import numpy as np
from sigma_c import Universe

fin = Universe.finance()
returns = np.random.randn(1000) * 0.02  # Simulated daily returns

# GARCH(1,1) volatility clustering analysis
garch = fin.analyze_volatility_clustering(returns)
print(f"Persistence: {garch['persistence']:.3f}")
print(f"Regime:      {'Critical' if garch['persistence'] > 0.95 else 'Stable'}")

Examples

The examples/v4/ directory contains 12 demo files covering every module:

Demo	Covers
demo_quantum.py	Quantum noise threshold detection
demo_finance.py	GARCH volatility, Hurst exponent
demo_climate.py	Atmospheric mesoscale boundary
demo_magnetic.py	2D Ising Curie temperature
demo_seismic.py	Gutenberg-Richter b-value
demo_gpu.py	GPU cache transition, roofline
demo_diagnostics.py	Universal diagnostics system
demo_integrations.py	GraphQL, CI, REST, WASM, HA, TF, LaTeX, Bridge
demo_ml_frameworks.py	PyTorch, JAX, CUDA, TensorFlow
demo_quantum_connectors.py	Qiskit, PennyLane, Cirq
demo_edge_llm.py	Edge IoT, ML hyperparameters, LLM cost
demo_optimization.py	ML optimizer, brute force, QuantLib, Zipline, Grafana/K8s

All demos run locally without external services or optional dependencies.

Documentation

• API Reference
• Release Notes
• Examples

License

Open Source: AGPL-3.0-or-later Commercial: Contact nfo@forgottenforge.xyz

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