End of inflation, oscillons, and matter-antimatter asymmetry

Lozanov, Kaloian D.; Amin, Mustafa A.

doi:10.1103/physrevd.90.083528

Cited by 70 publications

(74 citation statements)

References 106 publications

(180 reference statements)

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“…In a future paper [42] we passively calculate the metric fluctuations (Newtonian potentials) generated by these objects. We find that the Newtonian potential remains quite small compared to unity.…”

Section: Metric Perturbationsmentioning

confidence: 99%

“…9 The rapid appearance, approximately adiabatic evolution for an ≲e-fold, and sudden disappearance can lead to interesting gravitational wave signatures. We will explore the gravitational waves generated from the formation and eventual dispersion of these transients in a future paper [42].…”

Section: Transientsmentioning

confidence: 99%

“…In the same future paper [42], we will also calculate gravitational waves generated by the fragmentation of the field.…”

Section: Metric Perturbationsmentioning

confidence: 99%

“…For example, the larger class of models considered, the discussion on the formation of transients, a significantly more detailed analysis of both the linear fluctuations and the nonlinear power spectra go significantly beyond the PRL. Furthermore, this paper will be followed by another paper [42], where the passive gravitational effects from self-resonance will be addressed. In [42] we will discuss the likelihood of primordial black hole formation (from oscillons and transients), as well as the expected frequency and amplitude of primordial gravitational waves from inflaton fragmentation.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, this paper will be followed by another paper [42], where the passive gravitational effects from self-resonance will be addressed. In [42] we will discuss the likelihood of primordial black hole formation (from oscillons and transients), as well as the expected frequency and amplitude of primordial gravitational waves from inflaton fragmentation.…”

Section: Introductionmentioning

confidence: 99%

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Self-resonance after inflation: Oscillons, transients, and radiation domination

2018

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Homogeneous oscillations of the inflaton after inflation can be unstable to small spatial perturbations even without coupling to other fields. We show that for inflaton potentials ∝ jϕj 2n near jϕj ¼ 0 and flatter beyond some jϕj ¼ M, the inflaton condensate oscillations can lead to self-resonance, followed by its complete fragmentation. We find that for nonquadratic minima (n > 1), shortly after backreaction, the equation of state parameter, w → 1=3. If M ≪ m Pl , radiation domination is established within less than an e-fold of expansion after the end of inflation. In this case self-resonance is efficient and the condensate fragments into transient, localised spherical objects which are unstable and decay, leaving behind them a virialized field with mean kinetic and gradient energies much greater than the potential energy. This end-state yields w ¼ 1=3. When M ∼ m Pl we observe slow and steady, self-resonance that can last many e-folds before backreaction eventually shuts it off, followed by fragmentation and w → 1=3. We provide analytical estimates for the duration to w → 1=3 after inflation, which can be used as an upper bound (under certain assumptions) on the duration of the transition between the inflationary and the radiation dominated states of expansion. This upper bound can reduce uncertainties in CMB observables such as the spectral tilt n s , and the tensor-to-scalar ratio r. For quadratic minima (n ¼ 1), w → 0 regardless of the value of M. This is because when M ≪ m Pl , long-lived oscillons form within an e-fold after inflation, and collectively behave as pressureless dust thereafter. For M ∼ m Pl , the self-resonance is inefficient and the condensate remains intact (ignoring longterm gravitational clustering) and keeps oscillating about the quadratic minimum, again implying w ¼ 0.

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Section: Metric Perturbationsmentioning

confidence: 99%

Section: Transientsmentioning

confidence: 99%

“…In the same future paper [42], we will also calculate gravitational waves generated by the fragmentation of the field.…”

Section: Metric Perturbationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-resonance after inflation: Oscillons, transients, and radiation domination

2018

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Lepton Flavour Violation tests of Type II Seesaw Leptogenesis

Barrie

Petcov

2023

J. High Energ. Phys.

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Upcoming Lepton Flavour Violation experiments searching for μ → 3e and μ to e conversion in nuclei processes will provide new opportunities to test the fundamental properties of the neutrino sector, and possibly the origin of matter. In recent work, it was shown that the Type II Seesaw mechanism alone can simultaneously explain the neutrino masses, Leptogenesis, and inflation. A key prediction of this model was the possibility of signals being produced in Lepton Flavour Violation decays. Searches at future experiments such as Mu3e and COMET will be integral to determining the properties of the associated triplet Higgs, and will complement other terrestrial experimental searches and cosmological measurements. In this work, we survey the detection prospects for the ingredients of the Type II Seesaw Leptogenesis scenario, and discuss the corresponding dependencies on the neutrino oscillation parameters and $$ \mathcal{CP} $$ CP phases.

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A little theory of everything, with heavy neutral leptons

Cline

Puel

Toma

2020

J. High Energ. Phys.

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Recently a new model of "Affleck-Dine inflation" was presented, that produces the baryon asymmetry from a complex inflaton carrying baryon number, while being consistent with constraints from the cosmic microwave background. We adapt this model such that the inflaton carries lepton number, and communicates the lepton asymmetry to the standard model baryons via quasi-Dirac heavy neutral leptons (HNLs) and sphalerons. One of these HNLs, with mass 4.5 GeV, can be (partially) asymmetric dark matter (DM), whose asymmetry is determined by that of the baryons. Its stability is directly related to the vanishing of the lightest neutrino mass. Neutrino masses are generated by integrating out heavy sterile neutrinos whose mass is above the inflation scale. The model provides an economical origin for all of the major ingredients missing from the standard model: inflation, baryogenesis, neutrino masses, and dark matter. The HNLs can be probed in fixed-target experiments like SHiP, possibly manifesting N -N oscillations. A light singlet scalar, needed for depleting the DM symmetric component, can be discovered in beam dump experiments and searches for rare decays, possibly explaining anomalous events recently observed by the KOTO collaboration. The DM HNL is strongly constrained by direct searches, and could have a cosmologically interesting self-interaction cross section.

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End of inflation, oscillons, and matter-antimatter asymmetry

Cited by 70 publications

References 106 publications

Self-resonance after inflation: Oscillons, transients, and radiation domination

Self-resonance after inflation: Oscillons, transients, and radiation domination

Lepton Flavour Violation tests of Type II Seesaw Leptogenesis

A little theory of everything, with heavy neutral leptons

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