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. Since all photons were released at the same cosmic time, the photons with longer travel times started farther away from us than those with shorter times. Thus, the surface of last scattering is corrugated, a deformed spherical shell. 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:
-
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Univ. of Chicago, IL (United States). Enrico Fermi Inst., Kavli Inst. for Cosmological Physics
- Publication Date:
- Research Org.:
- Univ. of Chicago, IL (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Aeronautics and Space Administration (NASA); Simons Foundation
- OSTI Identifier:
- 1595730
- Alternate Identifier(s):
- OSTI ID: 1546836; OSTI ID: 1755679
- Grant/Contract Number:
- SC0009924; SC0019248; SC0010118
- 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. https://doi.org/10.1103/PhysRevD.100.043502
Li, Peikai, Dodelson, Scott, and Hu, Wayne. Thu .
"Distortions in the surface of last scattering". United States. https://doi.org/10.1103/PhysRevD.100.043502. https://www.osti.gov/servlets/purl/1595730.
@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. Since all photons were released at the same cosmic time, the photons with longer travel times started farther away from us than those with shorter times. Thus, the surface of last scattering is corrugated, a deformed spherical shell. 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 = {Thu Aug 01 00:00:00 EDT 2019},
month = {Thu Aug 01 00:00:00 EDT 2019}
}
Web of Science
Figures / Tables:
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Figures / Tables found in this record: