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Detectable Gravitational Wave Signals from Affleck-Dine Baryogenesis.
Phys Rev Lett
October 2021
Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan.
In Affleck-Dine baryogenesis, the observed baryon asymmetry of the Universe is generated through the evolution of the vacuum expectation value of a scalar condensate. This scalar condensate generically fragments into nontopological solitons (Q balls). If they are sufficiently long-lived, they lead to an early matter domination epoch, which enhances the primordial gravitational wave signal for modes that enter the horizon during this epoch.
View Article and Find Full Text PDFA little inflation in the early universe at the QCD phase transition.
Phys Rev Lett
July 2010
Institut für Theoretische Physik, Universität Heidelberg Philosphenweg 16, D-69120 Heidelberg, Germany.
We explore a scenario that allows for a strong first order phase transition of QCD at a non-negligible baryon number in the early Universe and its possible observable consequences. The main assumption is a quasistable QCD-vacuum state that leads to a short period of inflation, consequently diluting the net baryon to photon ratio to today's observed value. A strong mechanism for baryogenesis is needed to start out with a baryon asymmetry of order unity, e.
View Article and Find Full Text PDFEnhanced dark matter annihilation rate for positron and electron excesses from Q-ball decay.
Phys Rev Lett
October 2009
Cosmology and Astroparticle Physics Group, University of Lancaster, Lancaster LA1 4YB, United Kingdom.
We show that Q-ball decay in Affleck-Dine baryogenesis models can account for dark matter when the annihilation cross section is sufficiently enhanced to explain the positron and electron excesses observed by PAMELA, ATIC, and PPB-BETS. For Affleck-Dine baryogenesis along a d=6 flat direction, the reheating temperature is approximately 30 GeV and the Q-ball decay temperature is in the range of 10-100 MeV. The lightest supersymmetric particles produced by Q-ball decay annihilate down to the observed dark matter density if the cross section is enhanced by a factor approximately 10(3) relative to the thermal relic cross section.
View Article and Find Full Text PDFAxino dark matter from Q-balls in Affleck-Dine baryogenesis and the Omega b-Omega DM coincidence problem.
Phys Rev Lett
April 2007
Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom.
We show that the Omega b-Omega DM coincidence can naturally be explained in a framework where axino is cold dark matter which is predominantly produced in nonthermal processes involving decays of Q-balls formed in Affleck-Dine baryogenesis. In this approach, the similarity of Omega b and Omega DM is a direct consequence of the (sub-)GeV scale of the mass of the axino, while the reheating temperature TR must be low, some 10(2) GeV, or less.
View Article and Find Full Text PDFSingle field baryogenesis.
Phys Rev Lett
January 2005
Department of Physics, McGill University, Montréal, Quebec, Canada H3A 2T8.
We propose a new variant of the Affleck-Dine baryogenesis mechanism in which a rolling scalar field couples directly to left- and right-handed neutrinos, generating a Dirac mass term through neutrino Yukawa interactions. In this setup, there are no explicitly CP violating couplings in the Lagrangian. The rolling scalar field is also taken to be uncharged under the B - L quantum numbers.
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