One-loop corrections to the primordial tensor spectrum from massless isocurvature fields
We study one-loop corrections to the two-point correlation function of tensor perturbations in primordial cosmology induced by massless spectator matter fields. Using the Schwinger-Keldysh formalism in cosmological perturbation theory, we employ dimensional regularization and cutoff regularization t...
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| Format: | Journal Article |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/145595 |
| _version_ | 1811691033692471296 |
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| author | Tan, Hai Siong |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Tan, Hai Siong |
| author_sort | Tan, Hai Siong |
| collection | NTU |
| description | We study one-loop corrections to the two-point correlation function of tensor perturbations in primordial cosmology induced by massless spectator matter fields. Using the Schwinger-Keldysh formalism in cosmological perturbation theory, we employ dimensional regularization and cutoff regularization to study the finite quantum corrections at one-loop arising from isocurvature fields of the massless scalar, fermion and abelian gauge field which are freely propagating on the FRW spacetime. For all cases, we find a logarithmic running of the form Cq3H4M4p log (Hμ) where C is a negative constant related to the beta function, H is the Hubble parameter at horizon exit and μ is the renormalization scale. |
| first_indexed | 2024-10-01T06:13:28Z |
| format | Journal Article |
| id | ntu-10356/145595 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:13:28Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1455952023-02-28T19:54:50Z One-loop corrections to the primordial tensor spectrum from massless isocurvature fields Tan, Hai Siong School of Physical and Mathematical Sciences Science::Physics Classical Theories of Gravity Cosmology of Theories Beyond the SM We study one-loop corrections to the two-point correlation function of tensor perturbations in primordial cosmology induced by massless spectator matter fields. Using the Schwinger-Keldysh formalism in cosmological perturbation theory, we employ dimensional regularization and cutoff regularization to study the finite quantum corrections at one-loop arising from isocurvature fields of the massless scalar, fermion and abelian gauge field which are freely propagating on the FRW spacetime. For all cases, we find a logarithmic running of the form Cq3H4M4p log (Hμ) where C is a negative constant related to the beta function, H is the Hubble parameter at horizon exit and μ is the renormalization scale. Nanyang Technological University Published version I am very grateful to an anonymous referee for various useful advice, especially for his/her comments on the regularization procedures presented in [2] which led to an improvementover a previous manuscript draft. I am indebted to Chu Chong-Sun, Neal Snyderman, Ori Ganor, Petr Horava and Daniel Robbins for their moral support during the course of completion of this work. This work is partially supported by a research fellowship at the School of Physical and Mathematical Sciences, Nanyang Technological University of Singapore. 2020-12-30T01:46:16Z 2020-12-30T01:46:16Z 2020 Journal Article Tan, H. S. (2020). One-loop corrections to the primordial tensor spectrum from massless isocurvature fields. Journal of High Energy Physics, 2020(10), 186-. doi:10.1007/JHEP10(2020)186 1126-6708 https://hdl.handle.net/10356/145595 10.1007/JHEP10(2020)186 10 2020 en Journal of High Energy Physics © 2020 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. application/pdf |
| spellingShingle | Science::Physics Classical Theories of Gravity Cosmology of Theories Beyond the SM Tan, Hai Siong One-loop corrections to the primordial tensor spectrum from massless isocurvature fields |
| title | One-loop corrections to the primordial tensor spectrum from massless isocurvature fields |
| title_full | One-loop corrections to the primordial tensor spectrum from massless isocurvature fields |
| title_fullStr | One-loop corrections to the primordial tensor spectrum from massless isocurvature fields |
| title_full_unstemmed | One-loop corrections to the primordial tensor spectrum from massless isocurvature fields |
| title_short | One-loop corrections to the primordial tensor spectrum from massless isocurvature fields |
| title_sort | one loop corrections to the primordial tensor spectrum from massless isocurvature fields |
| topic | Science::Physics Classical Theories of Gravity Cosmology of Theories Beyond the SM |
| url | https://hdl.handle.net/10356/145595 |
| work_keys_str_mv | AT tanhaisiong oneloopcorrectionstotheprimordialtensorspectrumfrommasslessisocurvaturefields |