English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Production and backreaction of fermions from axion-SU(2) gauge fields during inflation

Mirzagholi, L., Maleknejad, A., & Lozanov, K. D. (2020). Production and backreaction of fermions from axion-SU(2) gauge fields during inflation. Physical Review D, 101(8): 083528. doi:10.1103/PhysRevD.101.083528.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0006-8F9F-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-8FA0-4
Genre: Journal Article

Files

show Files
hide Files
:
Production and backreaction of fermions from axion-SU(2) gauge fields during inflation.pdf (Any fulltext), 775KB
 
File Permalink:
-
Name:
Production and backreaction of fermions from axion-SU(2) gauge fields during inflation.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Mirzagholi, Leila1, Author              
Maleknejad, Azadeh1, Author              
Lozanov, Kaloian D.1, Author              
Affiliations:
1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

Content

show
hide
Free keywords: -
 Abstract: SU(2) gauge fields and axions can have a stable, isotropic and homogeneous configuration during inflation. However, couplings to other matter species lead to particle production, which in turn induces backreaction on and destabilization of the non-Abelian and axion background. In this paper, we first study the particle production by a SU(2) gauge field coupled to a massive Dirac doublet. To carry out this calculation we have made two technical improvements compared to what has been done in the literature. First, we apply the antisymmetrization of the operators to treat particles and antiparticles on equal footing; second, to deal with the UV divergences, we apply instantaneous subtraction. We find that the backreaction of produced fermions on the SU(2) background is negligible for model parameters of observational interest. Next, we consider production of fermions due to coupling to the axion. The tree-level backreaction on the gauge fields, as well as on the axion, is vanishingly small. We also provide an estimate for the loop effects.

Details

show
hide
Language(s):
 Dates: 2020-04-20
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1103/PhysRevD.101.083528
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 101 (8) Sequence Number: 083528 Start / End Page: - Identifier: ISSN: 2470-0010