Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/105870
Title: Noncommutative spacetime geometry and one-loop effects in primordial cosmology
Authors: Tan, Hai Siong
Keywords: Noncommutative Spacetime
Primordial Cosmology
DRNTU::Science::Physics
Issue Date: 2018
Source: Tan, H. S. (2018). Noncommutative spacetime geometry and one-loop effects in primordial cosmology. Physical Review D, 98(6), 063518-. doi:10.1103/PhysRevD.98.063518
Series/Report no.: Physical Review D
Abstract: We study the effect of noncommutative spacetime geometry on one-loop corrections to the primordial curvature two-point function, arising from various forms of massless spectator matter fields interacting gravitationally with the inflaton. After deforming the algebra of functions on the inflationary background to a spatially noncommutative one, we find that this induces momentum-dependent corrections to one-loop terms which imply that the vacuum fluctuations of the energy-momentum tensor source that of the curvature fluctuation even for distances beyond horizon scales. The one-loop corrections break spatial isotropy by being functions of the noncommutative parameters lying in the transverse plane while reducing smoothly to the commutative limit. This furnishes an example of how UV/IR mixing manifests itself in the context of noncommutative field theories defined on inflationary backgrounds, and demonstrates how in principle, the primordial spectrum could carry a signature of nonlocality and anisotropy in the setting of noncommutative spacetime geometry.
URI: https://hdl.handle.net/10356/105870
http://hdl.handle.net/10220/47414
ISSN: 2470-0010
DOI: 10.1103/PhysRevD.98.063518
Rights: © 2018 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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