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Related Experiment Video

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Transverse Aortic Constriction in Mice
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Transverse Velocities with the Moving Lens Effect.

Selim C Hotinli1, Joel Meyers2, Neal Dalal3

  • 1Astrophysics Group and Imperial Centre for Inference and Cosmology, Department of Physics, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, United Kingdom.

Physical Review Letters
|September 7, 2019
PubMed
Summary

Scientists can measure the transverse velocity of cosmic structures using the moving lens effect. Future cosmic microwave background (CMB) and galaxy surveys will enable the first detection of this phenomenon.

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Area of Science:

  • Cosmology
  • Astrophysics
  • General Relativity

Background:

  • Time-varying gravitational potentials cause fluctuations in the cosmic microwave background (CMB) temperature.
  • The moving lens effect, caused by cosmological structures moving transverse to the line of sight, is a specific example of these CMB temperature fluctuations.

Purpose of the Study:

  • To explore how CMB temperature fluctuations and observed matter overdensity can infer the transverse velocity of large-scale cosmological structures.
  • To demonstrate the potential for detecting the moving lens effect with future surveys.

Main Methods:

  • Analyzing CMB temperature fluctuations.
  • Utilizing observed matter overdensity data.
  • Statistical power analysis for future surveys.

Main Results:

  • The study shows that combining CMB temperature fluctuations with matter overdensity can be used to infer transverse velocities.
  • Near-future CMB and galaxy surveys possess the statistical power for a first detection of the moving lens effect.

Conclusions:

  • The moving lens effect offers a novel method for measuring the transverse velocity of cosmological structures.
  • Reconstructed transverse velocity measurements have potential applications in cosmology and astrophysics.