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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Cosmological Spatial Curvature with the Alcock-Paczyński Effect.

Luca Amendola1, Marco Marinucci2,3, Miguel Quartin4,5,6

  • 1Institute of Theoretical Physics, Philosophenweg 16, Heidelberg University, 69120, Heidelberg, Germany.

Physical Review Letters
|March 28, 2025
PubMed
Summary
This summary is machine-generated.

We present a new method to measure the universe's spatial curvature using galaxy clustering and the Alcock-Paczyński effect. This model-independent approach offers robust cosmological insights.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Galaxy Evolution

Background:

  • Understanding the universe's geometry is crucial for constraining cosmological models.
  • Previous methods often rely on specific assumptions about cosmological parameters or galaxy properties.

Purpose of the Study:

  • To propose a novel, model-independent methodology for measuring cosmological spatial curvature.
  • To leverage the Alcock-Paczyński effect in large-scale galaxy clustering for this measurement.

Main Methods:

  • Utilizing the deviation from statistical isotropy caused by the Alcock-Paczyński effect.
  • Analyzing large-scale galaxy clustering data, specifically combining power spectrum and bispectrum measurements.
  • Employing data from the Dark Energy Spectroscopic Instrument (DESI) and Euclid galaxy surveys.

Main Results:

  • The proposed method is independent of standard candles, rulers, clocks, power spectrum shape, galaxy bias, gravity theories, dark energy models, and background cosmology.
  • A combined DESI-Euclid galaxy survey can achieve a precision of ΔΩk0=0.057 at 1σ C.L. for redshift z<2.

Conclusions:

  • This Alcock-Paczyński-based approach provides a powerful and highly model-independent tool for cosmological curvature measurements.
  • Future galaxy surveys can significantly constrain the universe's spatial curvature with this technique.