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Title: Gravitational Fluctuations as an Alternative to Inflation II. CMB Angular Power Spectrum

Abstract

Power spectra always play an important role in the theory of inflation. In particular, the ability to reproduce the galaxy matter power spectrum P(k) and the CMB temperature angular power spectrum C l ’s to high accuracy is often considered a triumph of inflation. In our previous work, we presented an alternative explanation for the matter power spectrum based on nonperturbative quantum field-theoretical methods applied to Einstein’s gravity, instead of inflation models based on scalar fields. In this work, we review the basic concepts and provide further in-depth investigations. We first update the analysis with more recent data sets and error analysis, and then extend our predictions to the CMB angular spectrum coefficients C l , which we did not consider previously. Then we investigate further the potential freedoms and uncertainties associated with the fundamental parameters that are part of this picture, and show how recent cosmological data provides significant constraints on these quantities. Overall, we find good general consistency between theory and data, even potentially favoring the gravitationally-motivated picture at the largest scales. We summarize our results by outlining how this picture can be tested in the near future with increasingly accurate astrophysical measurements.

Authors:
ORCiD logo [1];  [2]
  1. Univ. of California, Irvine, CA (United States)
  2. Univ. of California, Irvine, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1598423
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Universe
Additional Journal Information:
Journal Volume: 5; Journal Issue: 11; Journal ID: ISSN 2218-1997
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; quantum cosmology; quantum gravity; inflationary cosmology

Citation Formats

Hamber, Herbert W., and Yu, Lu Heng Sunny. Gravitational Fluctuations as an Alternative to Inflation II. CMB Angular Power Spectrum. United States: N. p., 2019. Web. doi:10.3390/universe5110216.
Hamber, Herbert W., & Yu, Lu Heng Sunny. Gravitational Fluctuations as an Alternative to Inflation II. CMB Angular Power Spectrum. United States. doi:10.3390/universe5110216.
Hamber, Herbert W., and Yu, Lu Heng Sunny. Thu . "Gravitational Fluctuations as an Alternative to Inflation II. CMB Angular Power Spectrum". United States. doi:10.3390/universe5110216. https://www.osti.gov/servlets/purl/1598423.
@article{osti_1598423,
title = {Gravitational Fluctuations as an Alternative to Inflation II. CMB Angular Power Spectrum},
author = {Hamber, Herbert W. and Yu, Lu Heng Sunny},
abstractNote = {Power spectra always play an important role in the theory of inflation. In particular, the ability to reproduce the galaxy matter power spectrum P(k) and the CMB temperature angular power spectrum Cl ’s to high accuracy is often considered a triumph of inflation. In our previous work, we presented an alternative explanation for the matter power spectrum based on nonperturbative quantum field-theoretical methods applied to Einstein’s gravity, instead of inflation models based on scalar fields. In this work, we review the basic concepts and provide further in-depth investigations. We first update the analysis with more recent data sets and error analysis, and then extend our predictions to the CMB angular spectrum coefficients Cl , which we did not consider previously. Then we investigate further the potential freedoms and uncertainties associated with the fundamental parameters that are part of this picture, and show how recent cosmological data provides significant constraints on these quantities. Overall, we find good general consistency between theory and data, even potentially favoring the gravitationally-motivated picture at the largest scales. We summarize our results by outlining how this picture can be tested in the near future with increasingly accurate astrophysical measurements.},
doi = {10.3390/universe5110216},
journal = {Universe},
number = 11,
volume = 5,
place = {United States},
year = {2019},
month = {10}
}

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