Imprint of spatial curvature on inflation power spectrum

Journal Article · Fri Aug 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.043534· OSTI ID:21250482

Masso, Eduard; Zsembinszki, Gabriel ^[1]; Mohanty, Subhendra ^[1]; Nautiyal, Akhilesh ^[2]

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1. Department of Physics and IFAE, Universitat Autonoma de Barcelona, 08193 Bellaterra (Spain)
2. Physical Research Laboratory, Ahmedabad 380009 (India)

If the Universe had a large curvature before inflation there is a deviation from the scale invariant perturbations of the inflaton at the beginning of inflation. This may have some effect on the cosmic microwave background anisotropy at large angular scales. We calculate the density perturbations for both open and closed universe cases using the Bunch-Davies vacuum condition on the initial state. We use our power spectrum to calculate the temperature anisotropy spectrum and compare the results with the Wilkinson microwave anisotropy map five year data. We find that our power spectrum gives a lower quadrupole anisotropy when {omega}-1>0, but matches the temperature anisotropy calculated from the standard Ratra-Peebles power spectrum at large l. The determination of spatial curvature from temperature anisotropy data is not much affected by the different power spectra which arise from the choice of different boundary conditions for the inflaton perturbation.

• OSTI ID: 21250482
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
BOUNDARY CONDITIONS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DENSITY
DISTURBANCES
PERTURBATION THEORY
QUADRUPOLES
RELICT RADIATION
SPECTRA
UNIVERSE