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Title: Distortions in the surface of last scattering

Abstract

The surface of last scattering of the photons in the cosmic microwave background is not a spherical shell. Apart from its finite width, each photon experiences a different gravitational potential along its journey to us, leading to different travel times in different directions. Photons passing through an underdense region started farther away from us than those traveling through an overdense region. Thus, the surface of last scattering is corrugated, a deformed spherical shell. Here, we present an estimator quadratic in the temperature and polarization fields that could provide a map of the time delays as a function of position on the sky. The signal to noise of this map could exceed unity for the dipole, thereby providing a rare insight into the universe on the largest observable scales.

Authors:
ORCiD logo [1];  [1];  [2]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. Univ. of Chicago, IL (United States). Enrico Fermi Inst., Kavli Inst. for Cosmological Physics
Publication Date:
Research Org.:
Univ. of Chicago, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Aeronautics and Space Administration (NASA); Simons Foundation
OSTI Identifier:
1595730
Alternate Identifier(s):
OSTI ID: 1546836
Grant/Contract Number:  
[SC0009924; SC0019248]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
[ Journal Volume: 100; Journal Issue: 4]; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Cosmic microwave background

Citation Formats

Li, Peikai, Dodelson, Scott, and Hu, Wayne. Distortions in the surface of last scattering. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.043502.
Li, Peikai, Dodelson, Scott, & Hu, Wayne. Distortions in the surface of last scattering. United States. doi:10.1103/PhysRevD.100.043502.
Li, Peikai, Dodelson, Scott, and Hu, Wayne. Thu . "Distortions in the surface of last scattering". United States. doi:10.1103/PhysRevD.100.043502.
@article{osti_1595730,
title = {Distortions in the surface of last scattering},
author = {Li, Peikai and Dodelson, Scott and Hu, Wayne},
abstractNote = {The surface of last scattering of the photons in the cosmic microwave background is not a spherical shell. Apart from its finite width, each photon experiences a different gravitational potential along its journey to us, leading to different travel times in different directions. Photons passing through an underdense region started farther away from us than those traveling through an overdense region. Thus, the surface of last scattering is corrugated, a deformed spherical shell. Here, we present an estimator quadratic in the temperature and polarization fields that could provide a map of the time delays as a function of position on the sky. The signal to noise of this map could exceed unity for the dipole, thereby providing a rare insight into the universe on the largest observable scales.},
doi = {10.1103/PhysRevD.100.043502},
journal = {Physical Review D},
number = [4],
volume = [100],
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
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