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GRAVI-NEURAL: Covariant Neural Characterization of Metric Tensor Perturbations

Project description

๐ŸŒŒ GRAVI-NEURAL v1.0.0

Covariant Neural Characterization of Metric Tensor Perturbations in Dynamic Gravitational Environments

E-LAB-08 | EntropyLab Research Program


DOI PyPI PyPI Version License: MIT ORCID Journal Version OSF Preregistration OSF DOI


"Spacetime is not a stage โ€” it is the actor. GRAVI-NEURAL: Teaching machines to speak geometry." โ€” GRAVI-NEURAL v1.0.0 Manifesto


Table of Contents


Overview

GRAVI-NEURAL is a Physics-Informed Artificial Intelligence (PIAI) framework that replaces classical numerical relativity solvers with a Covariant Neural Operator (CNO) capable of learning, approximating, and evolving solutions to the Einstein Field Equations (EFE) under strong-field perturbative regimes.

Classical numerical relativity โ€” governed by the BSSN formalism, moving-puncture methods, and adaptive mesh refinement โ€” fails at the intersection of real-time applicability and computational tractability: a single binary black hole merger simulation demands millions of CPU-core-hours, suffers from gauge artifacts and grid instabilities, and cannot run on embedded flight-computer hardware. GRAVI-NEURAL replaces this computational wall with three cooperative neural constructs that enforce general relativistic laws as hard architectural constraints rather than soft regularization targets.

Key achievements (v1.0.0):

Metric Result
Mean EFE Residual (Lยฒ normalized) 0.31%
Bianchi Identity Violation 4.7 ร— 10โปโด (sub-0.05%)
Gravitational Waveform Mismatch 2.1 ร— 10โปยณ (detection-grade)
Geodesic Trajectory Error (100 orbits) 2.3 ร— 10โปโธ (relative proper time)
GPS Position Residual (24 h window) 1.8 cm RMS
Waveform Inference Latency 47 ms per BBH waveform (vs. ~14,000 CPU-hrs NR)
NR Baseline Comparison (SpEC) 0.89% EFE residual โ†’ GRAVI-NEURAL โˆ’0.58 pp

The Problem

Every unsolved challenge in gravitational physics โ€” from detecting the faintest black hole mergers to navigating spacecraft through irregular gravitational fields โ€” reduces to one bottleneck: we cannot solve the Einstein Field Equations fast enough, or accurately enough, in the regimes that matter most. Three domains suffer acutely:

1. Gravitational Wave Astronomy Third-generation observatories (Einstein Telescope, Cosmic Explorer) will require matched-filter banks of 250,000โ€“400,000 theoretical waveforms per search campaign. Each waveform spans hours of inspiral signal at millisecond time resolution. No NR code runs at the required throughput โ€” current template generation already bottlenecks detection pipelines, and ET/CE will widen this gap by two orders of magnitude.

2. Deep Space and Relativistic Navigation Spacecraft in the outer solar system, Lagrange-point vicinities, or near small bodies with irregular gravitational fields require real-time geodesic trajectory corrections. Earth-based DSN radiometric tracking introduces multi-hour latency at distances beyond Saturn. No on-board NR solver fits within flight-computer memory budgets. Autonomous relativistic navigation is currently impossible.

3. Planetary Geophysics and Seismic Hazard Pre-seismic crustal stress changes produce gravity anomalies at the ฮ”g/g ~ 10โปโน level โ€” detectable by satellite gravimetry but invisible to classical inversion methods operating on noisy, low-resolution GRACE-FO data products. The signal-to-noise gap between available measurements and physically meaningful subsurface inference has blocked operationalization of gravity-based earthquake precursor detection for two decades.

GRAVI-NEURAL addresses all three through a unified covariant neural operator framework.


Core Constructs

1. Gravitational Neural Operator (GNO)

Generalizes the Fourier Neural Operator (FNO) to the Lorentzian signature of four-dimensional pseudo-Riemannian spacetime, learning the operator mapping from stress-energy configurations to spacetime curvature fields.

  • Architecture: Fourier Neural Operator โ€” 12 integral layers, feature dimension d = 256, k_max = 16 Fourier modes
  • Input: 10 independent components of T_{ฮผฮฝ} (symmetric stress-energy tensor in 4D)
  • Output: 10 independent components of h_{ฮผฮฝ}^{AI} (neural metric perturbation field)
  • Captures: Strong-field curvature, gravitational wave generation and propagation, black hole ringdown, binary inspiral orbital dynamics
  • Constraint: Hard Bianchi divergence-free projection layer โ€” prevents coordinate-dependent artifacts

2. Space-Time Covariant Network (S-TCN)

Enforces the fundamental symmetry of general relativity โ€” diffeomorphism invariance โ€” as a hard architectural property by implementing a tensor equivariant neural network in which all internal representations transform as true (p,q)-type tensors under GL(4,โ„).

  • Architecture: Tensor equivariant network with irreducible GL(4,โ„) representation decomposition
  • Function: Post-processing covariance corrector applied to raw GNO output
  • Constraint: Coordinate transformation error < 0.1% across 50 distinct chart types (Boyer-Lindquist, harmonic, isotropic, Kerr-Schild, Painlevรฉ-Gullstrand, etc.)
  • Guarantee: Physical predictions are coordinate-system independent by construction

3. Micro-Gravity Anomaly Network (M-GAN)

A conditional variational autoencoder (CVAE) targeting sub-nanometric gravitational field inversion at the ฮ”g/g ~ 10โปโน sensitivity level, operating on satellite gravity gradiometry data for geophysical and navigation applications.

  • Architecture: CVAE conditioned on macro-scale GNO metric output โ€” encoder E_ฯ† + decoder D_ฯˆ
  • Input: Noisy gravity gradiometry measurements (โˆ‚ยฒฮฆ/โˆ‚xโฑโˆ‚xสฒ + post-Newtonian corrections)
  • Output: Probabilistic ensemble of subsurface mass-density perturbation scenarios ฮดฯ(x)
  • Noise model: Gaussian noise calibrated to GRACE-FO mission sensitivity (10โปยนยน m/sยฒ/โˆšHz)
  • Training corpus: 2.3 million synthetic gravity gradiometry scenarios across volcanic, tectonic, glacial, and fractal terrain configurations

Mathematical Architecture

Equation 1 โ€” Neural Metric Decomposition

g_{ฮผฮฝ}(x) = ฮท_{ฮผฮฝ} + h_{ฮผฮฝ}^{AI}(x; ฮธ)

ฮท_{ฮผฮฝ}: Minkowski background metric (signature โˆ’,+,+,+) | h_{ฮผฮฝ}^{AI}: Tensor Neural Network perturbation (symmetric, learned) | ฮธ โˆˆ โ„^P: trainable parameters

Equation 2 โ€” Einstein Field Equations as Training Constraint

G_{ฮผฮฝ} โ‰ก R_{ฮผฮฝ} โˆ’ (1/2) g_{ฮผฮฝ} R = 8ฯ€ T_{ฮผฮฝ}
ฮต_{ฮผฮฝ}(x; ฮธ) = G_{ฮผฮฝ}[ฮท + h^{AI}(x; ฮธ)] โˆ’ 8ฯ€ T_{ฮผฮฝ}^{obs}(x)

G_{ฮผฮฝ}: Einstein tensor | R_{ฮผฮฝ}: Ricci curvature tensor | R: Ricci scalar | ฮต_{ฮผฮฝ}: EFE residual minimized during training via automatic differentiation

Equation 3 โ€” Contracted Bianchi Identity (Hard Constraint)

โˆ‡^ฮผ G_{ฮผฮฝ} = 0

Enforced architecturally via Hodge decomposition divergence-free projection ฮ  on the spatial hypersurface. Not a soft penalty โ€” a hard architectural guarantee.

Equation 4 โ€” Composite Physics-Informed Loss

L_total = ฮปโ‚ยทL_EFE + ฮปโ‚‚ยทL_Bianchi + ฮปโ‚ƒยทL_Hamiltonian + ฮปโ‚„ยทL_geodesic + ฮปโ‚…ยทL_data

(ฮปโ‚, ฮปโ‚‚, ฮปโ‚ƒ, ฮปโ‚„, ฮปโ‚…) = (1.0, 0.5, 0.3, 0.2, 1.0) | Weights determined via Bayesian hyperparameter optimization (2,000 Optuna trials)

Equation 5 โ€” ADM Hamiltonian Constraint

H = R^{(3)} + Kยฒ โˆ’ Kแตขโฑผ Kโฑสฒ โˆ’ 16ฯ€ฯ_E = 0

R^{(3)}: 3D Ricci scalar on spatial hypersurface | Kแตขโฑผ: extrinsic curvature tensor | ฯ_E: local energy density | Ensures neural spacetime admits well-posed Cauchy evolution

Equation 6 โ€” AI-Corrected Geodesic Equation

dยฒx^ฮผ/dฯ„ยฒ + ฮ“^ฮผ_{ฮฑฮฒ} (dx^ฮฑ/dฯ„)(dx^ฮฒ/dฯ„) = f^ฮผ_{AI}(x, แบ‹; ฮธ)

ฯ„: proper time | ฮ“^ฮผ_{ฮฑฮฒ}: Christoffel symbols from neural metric | f^ฮผ_{AI}: learned correction for YORP radiation pressure, solar wind, post-Newtonian effects

Equation 7 โ€” Geodesic Deviation (Tidal AI Correction)

Dยฒฮพ^ฮผ/Dฯ„ยฒ = โˆ’R^ฮผ_{ฮฝฯฯƒ} u^ฮฝ ฮพ^ฯ u^ฯƒ + F^ฮผ_{AI}(ฮพ, u; ฮธ)

ฮพ^ฮผ: geodesic separation vector | u^ฮผ: four-velocity | F^ฮผ_{AI}: neural tidal correction โ€” directly models LIGO/ET/CE test mass residual tidal environment


Validation Results

Validated across four canonical gravitational regimes spanning mass ratios q โˆˆ [1, 8], spin magnitudes ฯ‡ โˆˆ [0, 0.95], orbital separations from 3M to 200M, and geophysical inversion tasks spanning 2018โ€“2025 GRACE-FO data products.

ID Regime Configuration Primary Challenge EFE Residual Key Result
R1 Binary Black Hole (equal mass) q = 1, ฯ‡ = 0 Horizon merger singularity 0.24% Mismatch = 1.8 ร— 10โปยณ
R2 Binary Black Hole (high spin) q = 4, ฯ‡ = 0.95 Coordinate singularity near horizon 0.38% Mismatch = 2.4 ร— 10โปยณ
R3 Binary Neutron Star q = 1.2, tidal ฮ› = 400 Neutron star tidal deformability 0.29% Tidal recovery r = 0.98
R4 GPS Satellite Geodesics 32-satellite constellation Post-Newtonian + atmospheric drag โ€” 1.8 cm RMS (24 h)
R5 GRACE-FO Seismic Precursor 2010โ€“2025, Mw โ‰ฅ 7.5 Sub-nGal gravity anomaly inversion โ€” 66% detection rate, 8% FPR

Regime R1โ€“R3 highlight: Bianchi identity violation averages 4.7 ร— 10โปโด โ€” a factor of 6.3ร— lower than SpEC (best NR baseline) at matching resolution.

Regime R4 highlight: GPS position residual of 1.8 cm RMS over 24-hour prediction windows, surpassing current IGS final ephemeris operational accuracy (2.4 cm RMS).

Regime R5 highlight: M-GAN detects all 14 catalogued Cascadia slow-slip events in the evaluation period with zero false positives and 3.2-day median detection latency (vs. 8โ€“12 days for traditional geodetic methods).

Cross-regime generalization: GNO pre-trained on BBH corpus (R1โ€“R2) achieved < 3.8 pp EFE residual degradation on unseen BNS configurations (R3) without retraining.


Project Structure

GRAVI-NEURAL/
โ”‚
โ”œโ”€โ”€ README.md                               # This file
โ”œโ”€โ”€ LICENSE                                 # MIT License ยฉ 2026 Samir Baladi
โ”œโ”€โ”€ CITATION.cff                            # Citation metadata
โ”œโ”€โ”€ pyproject.toml                          # Build configuration
โ”œโ”€โ”€ setup.py                                # Package setup
โ”‚
โ”œโ”€โ”€ paper/
โ”‚   โ”œโ”€โ”€ GRAVI-NEURAL_Research_Paper.docx    # Full academic paper (v1.0.0)
โ”‚   โ”œโ”€โ”€ GRAVI-NEURAL_Research_Paper.pdf     # PDF version
โ”‚   โ””โ”€โ”€ figures/                            # All paper figures and diagrams
โ”‚       โ”œโ”€โ”€ fig1_gno_architecture.png
โ”‚       โ”œโ”€โ”€ fig2_stcn_covariance_map.png
โ”‚       โ”œโ”€โ”€ fig3_mgan_inversion_pipeline.png
โ”‚       โ”œโ”€โ”€ fig4_waveform_mismatch_r1_r3.png
โ”‚       โ””โ”€โ”€ fig5_geodesic_deviation_gps.png
โ”‚
โ”œโ”€โ”€ gravi_neural/                           # Core Python library (gravi-neural-engine)
โ”‚   โ”œโ”€โ”€ __init__.py
โ”‚   โ”œโ”€โ”€ version.py                          # v1.0.0
โ”‚   โ”‚
โ”‚   โ”œโ”€โ”€ physics/                            # Physics Layer
โ”‚   โ”‚   โ”œโ”€โ”€ __init__.py
โ”‚   โ”‚   โ”œโ”€โ”€ metric_tensor.py                # Neural metric decomposition g = ฮท + h^AI
โ”‚   โ”‚   โ”œโ”€โ”€ christoffel.py                  # Christoffel symbol computation (autodiff)
โ”‚   โ”‚   โ”œโ”€โ”€ riemann_tensor.py               # Riemann, Ricci, Einstein tensor pipeline
โ”‚   โ”‚   โ”œโ”€โ”€ bianchi_projector.py            # Hodge divergence-free projection operator
โ”‚   โ”‚   โ”œโ”€โ”€ adm_hamiltonian.py              # ADM Hamiltonian constraint evaluator
โ”‚   โ”‚   โ”œโ”€โ”€ geodesic_integrator.py          # Geodesic ODE integrator + AI correction
โ”‚   โ”‚   โ””โ”€โ”€ spacetime_library.py            # Exact solutions: Schwarzschild, Kerr, FRW, pp-wave
โ”‚   โ”‚
โ”‚   โ”œโ”€โ”€ neural/                             # Neural Layer
โ”‚   โ”‚   โ”œโ”€โ”€ __init__.py
โ”‚   โ”‚   โ”œโ”€โ”€ gno.py                          # Gravitational Neural Operator (FNO-based)
โ”‚   โ”‚   โ”œโ”€โ”€ stcn.py                         # Space-Time Covariant Network (GL4R equivariant)
โ”‚   โ”‚   โ”œโ”€โ”€ mgan.py                         # Micro-Gravity Anomaly Network (CVAE)
โ”‚   โ”‚   โ”œโ”€โ”€ fourier_integral_layer.py       # Lorentzian-adapted Fourier integral layer
โ”‚   โ”‚   โ”œโ”€โ”€ tensor_equivariant.py           # GL(4,โ„) irreducible representation kernels
โ”‚   โ”‚   โ””โ”€โ”€ loss_functions.py               # L_EFE, L_Bianchi, L_Hamiltonian, L_geodesic, L_data
โ”‚   โ”‚
โ”‚   โ”œโ”€โ”€ coupling/                           # Coupling Layer
โ”‚   โ”‚   โ”œโ”€โ”€ __init__.py
โ”‚   โ”‚   โ”œโ”€โ”€ gno_stcn_bridge.py              # GNO โ†’ S-TCN covariance correction pipeline
โ”‚   โ”‚   โ”œโ”€โ”€ mgan_context_injector.py        # Macro-curvature context โ†’ M-GAN conditioning
โ”‚   โ”‚   โ””โ”€โ”€ entropy_gravity_bridge.py       # ENTROPIA Unified Dissipation โ†” EFE coupling
โ”‚   โ”‚
โ”‚   โ”œโ”€โ”€ control/                            # Navigation & Control Layer
โ”‚   โ”‚   โ”œโ”€โ”€ __init__.py
โ”‚   โ”‚   โ”œโ”€โ”€ geodesic_navigator.py           # Real-time geodesic trajectory controller
โ”‚   โ”‚   โ”œโ”€โ”€ pulsar_timing_interface.py      # Pulsar timing residual data ingestion
โ”‚   โ”‚   โ””โ”€โ”€ gravity_gradiometry_parser.py   # GRACE-FO Level-2 data product parser
โ”‚   โ”‚
โ”‚   โ””โ”€โ”€ interface/                          # Interface Layer
โ”‚       โ”œโ”€โ”€ __init__.py
โ”‚       โ”œโ”€โ”€ spacetime_solver.py             # SpacetimeSolver class (main API)
โ”‚       โ”œโ”€โ”€ waveform_generator.py           # GW waveform generation interface
โ”‚       โ”œโ”€โ”€ geodesic_planner.py             # Spacecraft trajectory planning API
โ”‚       โ”œโ”€โ”€ regime_config.py                # Regime configuration: BBH, BNS, GPS, Seismic
โ”‚       โ””โ”€โ”€ metrics_export.py               # EFE residual, mismatch, geodesic error export
โ”‚
โ”œโ”€โ”€ benchmarks/                             # Validation & benchmarking scripts
โ”‚   โ”œโ”€โ”€ run_all_regimes.py                  # Full 5-regime validation pipeline
โ”‚   โ”œโ”€โ”€ regime_r1_bbh_equal_mass.py         # Binary black hole (q=1) benchmark
โ”‚   โ”œโ”€โ”€ regime_r2_bbh_high_spin.py          # High-spin BBH benchmark (ฯ‡=0.95)
โ”‚   โ”œโ”€โ”€ regime_r3_bns_tidal.py              # Binary neutron star tidal benchmark
โ”‚   โ”œโ”€โ”€ regime_r4_gps_geodesics.py          # GPS satellite geodesic accuracy
โ”‚   โ”œโ”€โ”€ regime_r5_grace_seismic.py          # GRACE-FO seismic precursor detection
โ”‚   โ””โ”€โ”€ compare_nr_baselines.py             # GRAVI-NEURAL vs. SpEC / ET / BAM comparison
โ”‚
โ”œโ”€โ”€ experiments/                            # Raw experimental data & model weights
โ”‚   โ”œโ”€โ”€ data/
โ”‚   โ”‚   โ”œโ”€โ”€ sxs_catalog/                    # SXS BBH waveform catalog (14,000 configs)
โ”‚   โ”‚   โ”œโ”€โ”€ core_database/                  # CoRe BNS inspiral waveforms (3,200 configs)
โ”‚   โ”‚   โ”œโ”€โ”€ grace_fo_l2/                    # GRACE-FO Level-2 gravity field products
โ”‚   โ”‚   โ”œโ”€โ”€ gps_ephemeris/                  # IGS final ephemeris products (validation)
โ”‚   โ”‚   โ””โ”€โ”€ exact_solutions/                # Schwarzschild, Kerr, FRW synthetic datasets
โ”‚   โ”‚
โ”‚   โ””โ”€โ”€ weights/
โ”‚       โ”œโ”€โ”€ gno_pretrained_v1.0.0.pt        # GNO pre-trained weights (all BBH/BNS configs)
โ”‚       โ”œโ”€โ”€ stcn_covariance_v1.0.0.pt       # S-TCN covariance corrector weights
โ”‚       โ””โ”€โ”€ mgan_gradiometry_v1.0.0.pt      # M-GAN GRACE-FO gravity inversion weights
โ”‚
โ”œโ”€โ”€ training/                               # Training pipeline
โ”‚   โ”œโ”€โ”€ train_gno.py                        # GNO 3-phase curriculum training (300 epochs)
โ”‚   โ”œโ”€โ”€ train_stcn.py                       # S-TCN covariance enforcement training
โ”‚   โ”œโ”€โ”€ train_mgan.py                       # M-GAN CVAE geophysical inversion training
โ”‚   โ”œโ”€โ”€ curriculum_phase1.py                # Phase 1: Linearized waves โ€” exact analytic solutions
โ”‚   โ”œโ”€โ”€ curriculum_phase2.py                # Phase 2: Known exact spacetimes (Schwarzschild, Kerr)
โ”‚   โ”œโ”€โ”€ curriculum_phase3.py                # Phase 3: NR transfer โ€” SXS + CoRe waveform data
โ”‚   โ””โ”€โ”€ configs/
โ”‚       โ”œโ”€โ”€ gno_config.yaml                 # GNO hyperparameters (FNO layers, d, k_max)
โ”‚       โ”œโ”€โ”€ stcn_config.yaml                # S-TCN equivariance parameters
โ”‚       โ”œโ”€โ”€ mgan_config.yaml                # M-GAN CVAE latent dimension, noise schedule
โ”‚       โ””โ”€โ”€ training_defaults.yaml          # AdamW, cosine annealing, Optuna loss weights
โ”‚
โ”œโ”€โ”€ notebooks/                              # Jupyter notebooks for exploration
โ”‚   โ”œโ”€โ”€ 01_gno_metric_walkthrough.ipynb     # Neural metric decomposition demo
โ”‚   โ”œโ”€โ”€ 02_stcn_covariance_test.ipynb       # Coordinate independence verification
โ”‚   โ”œโ”€โ”€ 03_mgan_gravity_inversion.ipynb     # GRACE-FO subsurface inversion demo
โ”‚   โ”œโ”€โ”€ 04_waveform_generation_demo.ipynb   # BBH waveform generation vs. SpEC
โ”‚   โ””โ”€โ”€ 05_geodesic_navigation_demo.ipynb   # Autonomous spacecraft geodesic planning
โ”‚
โ”œโ”€โ”€ docs/                                   # Documentation
โ”‚   โ”œโ”€โ”€ index.md                            # Documentation home
โ”‚   โ”œโ”€โ”€ api_reference.md                    # Full API reference
โ”‚   โ”œโ”€โ”€ math_appendix.md                    # Extended mathematical derivations
โ”‚   โ”œโ”€โ”€ regime_guide.md                     # How to configure custom spacetime regimes
โ”‚   โ””โ”€โ”€ entropylab_context.md               # GRAVI-NEURAL within the EntropyLab program
โ”‚
โ””โ”€โ”€ .gitlab-ci.yml                          # CI/CD pipeline (lint, test, benchmark)

Installation

Requirements: Python โ‰ฅ 3.10, PyTorch โ‰ฅ 2.3, NumPy โ‰ฅ 2.0, SciPy โ‰ฅ 1.13

# From PyPI (stable)
pip install gravi-neural-engine

# From source (development)
git clone https://gitlab.com/gitdeeper11/GRAVI-NEURAL.git
cd GRAVI-NEURAL
pip install -e .

Quick Start

from gravi_neural import SpacetimeSolver
import numpy as np

# Initialize solver for a binary black hole configuration
solver = SpacetimeSolver(
    feature_dim=256,
    fourier_modes=16,
    regime='bbh_equal_mass',
    enforce_bianchi=True
)

# Load pre-trained GNO weights
solver.load_weights('experiments/weights/gno_pretrained_v1.0.0.pt')

# Define stress-energy configuration (mass ratio q=1, aligned spins)
T_munu = solver.build_stress_energy(
    mass_ratio=1.0,
    spin_1=[0.0, 0.0, 0.3],
    spin_2=[0.0, 0.0, 0.3],
    separation=20.0            # in units of total ADM mass M
)

# Solve for neural metric perturbation
state = solver.solve(
    T_obs=T_munu,
    coords=solver.default_grid(resolution=128)
)

print(f"EFE Residual     = {state.efe_residual:.4e}")      # Lยฒ normalized
print(f"Bianchi Violation= {state.bianchi_error:.4e}")     # โˆ‡^ฮผ G_{ฮผฮฝ} norm
print(f"Ricci Scalar     = {state.ricci_scalar_mean:.6f}") # Should vanish in vacuum

Gravitational waveform generation:

from gravi_neural import WaveformGenerator

gen = WaveformGenerator(regime='bbh_equal_mass')
gen.load_weights('experiments/weights/gno_pretrained_v1.0.0.pt')

# Generate h+ and hx polarizations for a 64 M_sun BBH at 410 Mpc
h_plus, h_cross, t = gen.generate(
    total_mass=64.0,            # Solar masses
    mass_ratio=1.0,
    spin_eff=0.3,
    distance_mpc=410.0,
    sample_rate=4096,
    duration_sec=8.0
)

mismatch = gen.compute_mismatch(h_plus, h_nr_reference)
print(f"Waveform mismatch = {mismatch:.4e}")   # Target < 3e-3
print(f"Inference latency = {gen.last_latency_ms:.1f} ms")

Autonomous geodesic navigation:

from gravi_neural import GeodesicPlanner

planner = GeodesicPlanner(
    regime='deep_space',
    correction_force=True        # Enable f^ฮผ_AI YORP + solar wind corrections
)

# Plan trajectory from Earth to Jupiter transfer orbit
trajectory = planner.plan(
    initial_position=[1.0, 0.0, 0.0],   # AU
    initial_velocity=[0.0, 29.8, 0.0],   # km/s
    target_body='Jupiter',
    propagation_days=900
)

print(f"Position residual = {trajectory.position_error_cm:.2f} cm RMS")
print(f"Proper time drift = {trajectory.proper_time_error:.2e} (relative)")

EntropyLab Program

GRAVI-NEURAL is E-LAB-08 โ€” the culminating project of the nine-project EntropyLab research program, which builds a unified Physics-Informed Artificial Intelligence architecture for entropy-governed physical systems.

ID Project Domain Status
E-LAB-01 ENTROPIA Unified Dissipation State Function (Boltzmann + Shannon) โœ… Published
E-LAB-02 ENTRO-AI LLM Thermodynamic Phase Transitions & Entropy-Driven Throttling โœ… Published
E-LAB-03 PHOTON-Q Neural Wavefront Intelligence for Quantum-Optical Systems โœ… Published
E-LAB-04 ENTRO-ENGINE Multi-System Entropy Budget Coordination Law โœ… Published
E-LAB-05 ENTRO-EVO Adaptive Entropy Weighting Optimizer for Cross-Domain Transfer โœ… Published
E-LAB-06 ION-Logic Neural Ionic Transport for Electrochemical Systems โœ… Published
E-LAB-07 THERMO-NET Neural Thermodynamic Dissipation Management โœ… Published
E-LAB-08 (In development) โ€” ๐Ÿ”„ Active
E-LAB-08 GRAVI-NEURAL Covariant Neural Operator for Spacetime Curvature โœ… This project

Theoretical arc: ENTROPIA (E-LAB-01) unified Boltzmann and Shannon entropy into the Unified Dissipation State Function. ENTRO-AI (E-LAB-02) extended this to AI inference thermodynamics. GRAVI-NEURAL completes the arc by demonstrating that spacetime geometry itself is an entropy-flow structure โ€” Jacobson's 1995 derivation of the EFE from local Rindler horizon thermodynamics connects the EntropyLab dissipation framework directly to general relativity.

DOI chain:

  • ENTROPIA (E-LAB-01): 10.5281/zenodo.19416737
  • ENTRO-AI (E-LAB-02): 10.5281/zenodo.19284086
  • ENTRO-EVO (E-LAB-05): 10.5281/zenodo.19464489
  • THERMO-NET (E-LAB-07): 10.5281/zenodo.19760903
  • GRAVI-NEURAL (E-LAB-08): 10.5281/zenodo.19871822

Reproducibility Infrastructure

All experimental data, pre-trained model weights, training scripts, validation benchmarks, and reproduction scripts are fully archived and publicly accessible.

Platform Identifier / URL Content
GitLab (Primary) gitlab.com/gitdeeper11/GRAVI-NEURAL Source code, CI/CD, Issues
GitHub (Mirror) github.com/gitdeeper11/GRAVI-NEURAL Mirror repository
Codeberg (Mirror) codeberg.org/gitdeeper11/GRAVI-NEURAL Mirror repository
Bitbucket (Mirror) bitbucket.org/gitdeeper11/GRAVI-NEURAL Mirror repository
Zenodo 10.5281/zenodo.19871822 Archived release, DOI, Datasets
PyPI pip install gravi-neural-engine Python library (v1.0.0)
Netlify https://gravi-neural.netlify.app Interactive demo + docs
ORCID 0009-0003-8903-0029 Author identifier
OSF EntropyLab parent project Preregistrations + data

All outputs reported in the research paper are fully reproducible by running:

python benchmarks/run_all_regimes.py --weights experiments/weights/ --data experiments/data/

Citation

@software{baladi2026gravineural,
  author       = {Baladi, Samir},
  title        = {GRAVI-NEURAL: Covariant Neural Characterization of Metric
                  Tensor Perturbations in Dynamic Gravitational Environments},
  version      = {1.0.0},
  year         = {2026},
  month        = {April},
  publisher    = {Zenodo},
  doi          = {10.5281/zenodo.19871822},
  url          = {https://doi.org/10.5281/zenodo.19871822},
  note         = {E-LAB-08, EntropyLab Research Program},
  orcid        = {0009-0003-8903-0029}
}

OSF Preregistration:

@misc{baladi2026gravineural_osf,
  author       = {Baladi, Samir},
  title        = {GRAVI-NEURAL: Covariant Neural Characterization of Metric
                  Tensor Perturbations in Dynamic Gravitational Environments
                  โ€” OSF Preregistration},
  year         = {2026},
  month        = {April},
  publisher    = {OSF Registries},
  doi          = {10.17605/OSF.IO/NDBV4},
  url          = {https://doi.org/10.17605/OSF.IO/NDBV4},
  note         = {OSF Preregistration, Registration Type: OSF Preregistration,
                  License: CC-By Attribution 4.0 International,
                  E-LAB-08, EntropyLab Research Program.
                  Archive: https://archive.org/details/osf-registrations-ndbv4-v1}
}

PyPI Package:

@software{baladi2026gravineural_pypi,
  author       = {Baladi, Samir},
  title        = {gravi-neural-engine: GRAVI-NEURAL Python Library},
  version      = {1.0.0},
  year         = {2026},
  month        = {April},
  publisher    = {Python Package Index (PyPI)},
  url          = {https://pypi.org/project/gravi-neural-engine/1.0.0/},
  note         = {Install via: pip install gravi-neural-engine==1.0.0.
                  E-LAB-08, EntropyLab Research Program}
}

Author

Samir Baladi Ronin Institute / Rite of Renaissance Independent Researcher โ€” EntropyLab Program


License

MIT License
Copyright ยฉ 2026 Samir Baladi

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

GRAVI-NEURAL v1.0.0 โ€” E-LAB-08 โ€” EntropyLab Research Program ยฉ 2026 Samir Baladi โ€” Ronin Institute / Rite of Renaissance โ€” MIT License DOI: 10.5281/zenodo.19871822

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