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Title: Can the baryon asymmetry arise from initial conditions?

Abstract

In this letter, we quantify the challenge of explaining the baryon asymmetry using initial conditions in a universe that undergoes inflation. Contrary to lore, we find that such an explanation is possible if net $B-L$ number is stored in a light bosonic field with hyper-Planckian initial displacement and a delicately chosen field velocity prior to inflation. However, such a construction may require extremely tuned coupling constants to ensure that this asymmetry is viably communicated to the Standard Model after reheating; the large field displacement required to overcome inflationary dilution must not induce masses for Standard Model particles or generate dangerous washout processes. While these features are inelegant, this counterexample nonetheless shows that there is no theorem against such an explanation. We also comment on potential observables in the double $$\beta$$-decay spectrum and on model variations that may allow for more natural realizations.

Authors:
 [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1294438
Alternate Identifier(s):
OSTI ID: 1377976
Report Number(s):
arXiv:1606.05344; FERMILAB-PUB-16-110-PPD
Journal ID: ISSN 2470-0010; PRVDAQ; 1471078
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Krnjaic, Gordan. Can the baryon asymmetry arise from initial conditions?. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.035041.
Krnjaic, Gordan. Can the baryon asymmetry arise from initial conditions?. United States. doi:10.1103/PhysRevD.96.035041.
Krnjaic, Gordan. Tue . "Can the baryon asymmetry arise from initial conditions?". United States. doi:10.1103/PhysRevD.96.035041.
@article{osti_1294438,
title = {Can the baryon asymmetry arise from initial conditions?},
author = {Krnjaic, Gordan},
abstractNote = {In this letter, we quantify the challenge of explaining the baryon asymmetry using initial conditions in a universe that undergoes inflation. Contrary to lore, we find that such an explanation is possible if net $B-L$ number is stored in a light bosonic field with hyper-Planckian initial displacement and a delicately chosen field velocity prior to inflation. However, such a construction may require extremely tuned coupling constants to ensure that this asymmetry is viably communicated to the Standard Model after reheating; the large field displacement required to overcome inflationary dilution must not induce masses for Standard Model particles or generate dangerous washout processes. While these features are inelegant, this counterexample nonetheless shows that there is no theorem against such an explanation. We also comment on potential observables in the double $\beta$-decay spectrum and on model variations that may allow for more natural realizations.},
doi = {10.1103/PhysRevD.96.035041},
journal = {Physical Review D},
number = 3,
volume = 96,
place = {United States},
year = {Tue Aug 01 00:00:00 EDT 2017},
month = {Tue Aug 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on August 1, 2018
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Cited by: 1 work
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