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Localizing Transformations of the Galaxy-Galaxy Lensing Observable.

Youngsoo Park1, Eduardo Rozo2, Elisabeth Krause3

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Galaxy-galaxy lensing analyses are improved by a new method that removes theoretical nonlocality. This technique enhances cosmological signal extraction and expands usable scales for galaxy lensing studies.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Gravitational Lensing

Background:

  • Galaxy-galaxy lensing analyses are affected by theoretical systematic errors due to signal nonlocality.
  • Uncertainties in small-scale nonlinear modeling propagate to larger scales, limiting data analysis.

Purpose of the Study:

  • To develop a method to remove nonlocality in galaxy-galaxy lensing signals.
  • To enable the use of a wider range of scales in cosmological analyses.

Main Methods:

  • Constructed a linear transformation of the standard galaxy-galaxy observable.
  • The transformation removes nonlocality, isolating the cosmological signal on well-understood scales.

Main Results:

  • The new observable is robust against nonlocality.
  • This method allows for a significant extension of usable scales in galaxy-galaxy lensing.

Conclusions:

  • The developed observable enhances the reliability and information content of galaxy-galaxy lensing data.
  • This approach offers a more effective way to probe cosmological parameters using galaxy lensing.