skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Axion inflation and Affleck-Dine baryogenesis

Abstract

String theory generically predicts the coupling between the Affleck-Dine field and axion field through higher-dimensional operators. We thus explore the Affleck-Dine baryogenesis on an axion background. It turns out that the axion oscillation produces an enough amount of baryon asymmetry of the Universe just after the inflation, even without a soft supersymmetry-breaking A -term. This baryogenesis scenario is applicable to the string axion inflation.

Authors:
;  [1];  [2]
  1. Department of Physics, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo, 169-8555 Japan (Japan)
  2. Department of Physics, Hokkaido University, Kita-10, Nishi-8, Kita-ku, Sapporo, 060-0810 Japan (Japan)
Publication Date:
OSTI Identifier:
22679899
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; AXIONS; BARYONS; COUPLING; INFLATIONARY UNIVERSE; OSCILLATIONS; PARTICLE PRODUCTION; SIMULATION; STRING THEORY; SUPERSYMMETRY; SYMMETRY BREAKING; UNIVERSE

Citation Formats

Akita, Kensuke, Otsuka, Hajime, and Kobayashi, Tatsuo, E-mail: ken8a1@asagi.waseda.jp, E-mail: kobayashi@particle.sci.hokudai.ac.jp, E-mail: h.otsuka@aoni.waseda.jp. Axion inflation and Affleck-Dine baryogenesis. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/04/042.
Akita, Kensuke, Otsuka, Hajime, & Kobayashi, Tatsuo, E-mail: ken8a1@asagi.waseda.jp, E-mail: kobayashi@particle.sci.hokudai.ac.jp, E-mail: h.otsuka@aoni.waseda.jp. Axion inflation and Affleck-Dine baryogenesis. United States. doi:10.1088/1475-7516/2017/04/042.
Akita, Kensuke, Otsuka, Hajime, and Kobayashi, Tatsuo, E-mail: ken8a1@asagi.waseda.jp, E-mail: kobayashi@particle.sci.hokudai.ac.jp, E-mail: h.otsuka@aoni.waseda.jp. Sat . "Axion inflation and Affleck-Dine baryogenesis". United States. doi:10.1088/1475-7516/2017/04/042.
@article{osti_22679899,
title = {Axion inflation and Affleck-Dine baryogenesis},
author = {Akita, Kensuke and Otsuka, Hajime and Kobayashi, Tatsuo, E-mail: ken8a1@asagi.waseda.jp, E-mail: kobayashi@particle.sci.hokudai.ac.jp, E-mail: h.otsuka@aoni.waseda.jp},
abstractNote = {String theory generically predicts the coupling between the Affleck-Dine field and axion field through higher-dimensional operators. We thus explore the Affleck-Dine baryogenesis on an axion background. It turns out that the axion oscillation produces an enough amount of baryon asymmetry of the Universe just after the inflation, even without a soft supersymmetry-breaking A -term. This baryogenesis scenario is applicable to the string axion inflation.},
doi = {10.1088/1475-7516/2017/04/042},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2017,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}
  • The phenomenology of supersymmetric models of inflation, where the inflationary vacuum energy is dominated by {ital D} terms of a U(1), is investigated. Particular attention is paid to the questions of how to arrange for sufficient {ital e} folds of inflation to occur, what kind of thermal history is expected after the end of inflation, and how to implement successful baryogenesis. Such models are argued to require a more restrictive symmetry structure than previously thought. In particular, it is nontrivial that the decays of the fields driving {ital D} inflation can reheat the Universe in such a way as tomore » avoid the strong gravitino production constraints. We also show how the initial conditions for Affleck-Dine baryogenesis can arise in these models and that the simplest flat directions along which a baryon number is generated can often be ruled out by the constraints coming from a decoherence of the condensate in a hot environment. At the end, we find that successful reheating and baryogenesis can take place in a large subset of {ital D}-inflationary models. {copyright} {ital 1999} {ital The American Physical Society}« less
  • We argue that an extension of the minimal supersymmetric standard model (MSSM) that gives rise to viable thermal inflation, and so does not suffer from a Polonyi or moduli problem, should contain right-handed neutrinos which acquire their masses due to the vacuum expectation value of the flaton that drives thermal inflation. This strongly disfavors SO(10) grand unified theories. The {mu} term of the MSSM should also arise due to the VEV of the flaton. With the extra assumption that {ital m}{sup 2}{sub {ital L}}{minus}{ital m}{sub {ital H}{sub {ital u}}}{sup 2}{lt}0, but, of course, {ital m}{sup 2}{sub {ital L}}{minus}{ital m}{sub {italmore » H}{sub {ital u}}}{sup 2}+{vert_bar}{mu}{vert_bar}{sup 2}{gt}0, we show that a complicated Affleck-Dine-type baryogenesis employing an {ital LH}{sub {ital u}} {ital D}-flat direction can naturally generate the baryon asymmetry of the Universe. {copyright} {ital 1996 The American Physical Society.}« less
  • Thermal inflation can solve serious cosmological problems such as overproduction of gravitinos and moduli. However, it also dilutes the preexisting baryon asymmetry. We investigate a possibility that the Affleck-Dine mechanism works after thermal inflation and generates the baryon number at an acceptable level using lattice calculation. We find that a proper amount of baryon number can be generated for appropriate model parameters.
  • It is shown that, in the context of split supersymmetry, a simple model with a single complex scalar field can produce chaotic inflation and generate the observed amount of baryon asymmetry via the Affleck-Dine mechanism. While the inflaton quantum fluctuations give rise to curvature perturbation, we show that quantum fluctuations of the phase of the scalar field can produce baryonic isocurvature perturbation. Combining with constraints from WMAP data, all parameters in the model can be determined to within a narrow range.
  • Constructing models of inflation and/or baryogenesis in the context of N = 1 supergravity is known to be difficult as the finite energy density during inflation typically generates large (order the Hubble scale) mass terms. This is the well-known η problem in inflation. The same effect gives masses along low energy flat directions of the scalar potential thus potentially preventing Affleck-Dine baryogenesis to occur. It has been shown that adding a chiral multiplet S coupled to the inflaton (with a shift symmetry) can serve to stabilize the inflationary potential and allows one to derive simple inflationary potentials without an ηmore » problem. Here, we show that by coupling the same stabilizing field S to the flat direction, may naturally lead to a negative mass-squared contribution to the flat direction thus generating the necessarily large vacuum expectation value needed to realize Affleck-Dine baryogenesis. We trace the evolution of the inflaton, stabilizer, and flat direction field, as well as a Polonyi-like modulus responsible for soft supersymmetry breaking.« less