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piabarria/README.md

Pía Barría Herrera

Final-year Physics undergraduate at Universidad de Valparaíso, Chile, with interests in cosmology, computational physics, and scientific computing.

My current work focuses on numerical and computational approaches to cosmology, including dark-sector models, cosmological inference, and machine-learning emulators.

Research Interests

  • Cosmology and dark energy
  • Cosmological inference
  • Computational physics
  • Machine learning for physics
  • High-performance and scientific computing

Current Research

Neural-network emulator for the linear matter power spectrum (P(k,z=0)) generated with CLASS.

The emulator was trained on 16,384 cosmologies and maps

[ (h,\omega_m,\omega_b,n_s) \longrightarrow P(k,z=0). ]

The final model reaches a mean relative error of approximately 0.022% on an independent test set and provides a batch speed-up of approximately (2.4\times10^4) relative to CLASS for 1,000 cosmologies.

Numerical study of a Chaplygin–Jacobi cosmological fluid and its mapping to an equivalent interacting dark-sector description.

The project includes background evolution, density fractions, effective equations of state, interaction terms, parameter-space analysis, and numerical reproduction of the main figures associated with the research work.

Selected Computational Projects

Monte Carlo simulation of the two-dimensional Ising model using the Metropolis algorithm, with serial and OpenMP implementations.

Finite-difference solution of the three-dimensional wave equation in C, comparing scalar and AVX/SIMD implementations and including Python-based visualization.

Course Projects

Artificial Intelligence course project using PyTorch to classify SDSS sources into galaxies, quasars and stars from photometric features and redshift.

Scientific Computing

Languages: Python, C

Scientific tools: NumPy, SciPy, Matplotlib, TensorFlow, scikit-learn, CLASS

Parallel and high-performance computing: OpenMP, SIMD/AVX

Development: Linux, Git, Jupyter, Google Colab

Academic Links

Contact

Universidad de Valparaíso
Chile

Pinned Loading

  1. 3d-wave-equation-avx 3d-wave-equation-avx Public

    Finite-difference simulation of the 3D wave equation in C with AVX vectorization and Python visualization.

    C

  2. cosmological-power-spectrum-emulator cosmological-power-spectrum-emulator Public

    Neural-network emulator for the linear matter power spectrum generated with CLASS.

    Jupyter Notebook

  3. dark-degeneracy-chaplygin-jacobi dark-degeneracy-chaplygin-jacobi Public

    Background evolution and interacting dark-sector mapping of the Chaplygin-Jacobi fluid.

    Jupyter Notebook

  4. ising-model-openmp ising-model-openmp Public

    Parallel 2D Ising model simulation in C using the Metropolis algorithm and OpenMP.

    C