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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Wash-In Leptogenesis.

Valerie Domcke1,2, Kohei Kamada3, Kyohei Mukaida1,4

  • 1Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland.

Physical Review Letters
|June 10, 2021
PubMed
Summary
This summary is machine-generated.

Wash-in leptogenesis, a new mechanism in the type-I seesaw model, generates baryon asymmetry without CP violation, even with strong wash-out. It operates at lower right-handed neutrino masses, around a few hundred TeV.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astroparticle Physics

Background:

  • Leptogenesis is a leading mechanism for explaining the matter-antimatter asymmetry in the universe.
  • Standard leptogenesis models often require CP violation in the neutrino sector and operate at high right-handed neutrino masses.
  • The type-I seesaw model provides a framework for generating neutrino masses and offers a basis for leptogenesis.

Purpose of the Study:

  • To introduce a novel leptogenesis mechanism, termed wash-in leptogenesis, within the standard type-I seesaw model.
  • To demonstrate that this mechanism can operate at lower right-handed neutrino masses (few hundred TeV) and does not require CP violation in the neutrino sector.
  • To explore its viability even in the presence of strong wash-out conditions.

Main Methods:

  • Generalizing standard freeze-out leptogenesis to a nonminimal cosmological background.
  • Allowing arbitrary values for chemical potentials of particles not in chemical equilibrium at leptogenesis temperature.
  • Investigating the generation of a non-vanishing B-L asymmetry by reprocessing high-temperature chemical potentials.

Main Results:

  • Wash-in leptogenesis successfully operates at right-handed neutrino masses as low as a few hundred TeV.
  • The mechanism is effective even in the regime of strong wash-out.
  • It does not necessitate CP violation within the neutrino sector.

Conclusions:

  • Wash-in leptogenesis provides a viable and potentially simpler alternative for generating the observed baryon asymmetry.
  • This framework opens avenues for new baryogenesis models by utilizing chemical potentials generated at high temperatures.
  • The mechanism is compatible with cosmological scenarios like axion inflation and grand unification theories.