transport theory for ew baryogenesis & leptogenesis · 3 transport issues • how robustly can...

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Transport Theory for EWBaryogenesis & Leptogenesis

M.J. Ramsey-MusolfWisconsin-MadisonU Mass-Amherst

Snowmass CSS, August 2013

Amherst Center forFundamental Interactions

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Key Points

• Robust tests of low-scale baryogenesis scenarios !Refine theoretical machinery for computingasymmetries in out-of-equilibrium contexts

• Pioneering work utilized conventional Boltzmannframework

• Recent advances exploiting Schwinger-Keldysh/CTP formulation are providing a moresystematic treatment

• Considerable room for future theoretical progressexists

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Transport Issues

• How robustly can one predict charge asymmetries ( nleft, Yl , YX…) ?

• What is the role of CP-conserving dynamics ?

• CPV sources in EWB (MSSM…)

• CPV decays in leptogenesis (soft lepto)

• Particle number changing rxns in EWB

• Washout in leptogenesis, asym DM…

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Outline

I. Transport dynamics in CTP

II. CPV sources in EWB & softLeptogenesis

III. Particle number changing reactionsin EWB

IV. Flavored CPV & EWB

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Systematic Baryo/leptogenesis:Formalism: Kadanoff-Baym to Boltzmann

!

˜ G (x, y) = P"a (x)"b* (y) # ab =

Gt (x, y) $G<(x,y)G>(x, y) $Gt (x, y)

%

& '

(

) *

CTP or Schwinger-Keldysh Green’s functions

• Appropriate for evolution of “in-in” matrix elements

• Contain full info on number densities: nαβ• Matrices in flavor space: (e,µ,τ) , ( tL, tR ), …

~ ~

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= + + …

!

˜ G

!

˜ G 0 +

!

˜ G 0

!

˜ G 0

!

˜ "

!

˜ G (x, y) = P"a (x)"b* (y) # ab =

Gt (x, y) $G<(x,y)G>(x, y) $Gt (x, y)

%

& '

(

) *

CTP or Schwinger-Keldysh Green’s functions

• Appropriate for evolution of “in-in” matrix elements

• Contain full info on number densities: nαβ• Matrices in flavor space: (e,µ,τ) , ( tL, tR ), …

~ ~

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Systematic Baryo/leptogenesis:

Scale Hierarchies

Thermal, but not too dissipative

Gradient expansion

Quasiparticle description

εw = vw (kw / ω ) << 1

εp = Γp / ω << 1

Plural, but not too flavored

εcoll = Γcoll / ω << 1

εosc = Δω / T << 1

EW Baryogenesis Leptogenesis

εLNV = ΓLNV / ΓΗ < 1

Gradient expansion

Quasiparticle description

εp = Γp / ω << 1

Thermal, but not too dissipative

εcoll = Γcoll / ω << 1

! power counting

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!

2k " #X G< k,X( ) = $i M 2 X( ),G< k,X( )[ ] $ 2 k " %,G< k,X( )[ ] + & G k,X( )[ ]

Kinetic eq (approx) in Wigner space: Lowest non-trivial order in grad’s

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Kinetic eq (approx) in Wigner space:

!


Diagonal after rotation to local mass basis:

!

M 2 X( ) =U + m2 X( )U

!

"µ X( ) =U +#µU~ ~( tL, tR ) ! ( t1, t2 )

~ ~

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!


Flavor oscillations: flavor off-diag densities

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!


CPV in m2(X): for EWB, arises from spacetimevarying complex phase(s) generated byinteraction of background field(s) (Higgs vevs)with quantum fields

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!



How large is CPV source ? Riotto; Carena et al;Prokopec et al; Cline et al; Konstandin et al; Cirigliano etal; Kainulainen….

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!



✔

✔ = recent progressResonant enhancement ofCPV sources for small εosc

Cirigliano et al

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CPV Sources: EW BaryogenesisCPV Sources: how large a sinφCPV necessary ?


!


VEV insert approx

• Riotto• Carena et al• Cirigliano et al

Resummed vevs

• Konstandin,Prokpec, Schmidt

Resummed vevs

• Cirigliano et al

Large resonantenhancement butnot realistic insmall εosc regime

Exact solution in two-flavor toy model:large resonantenhancement

Small resonanteffect but neglecteddiffusion and off-diag Σii Gij terms

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!


VEV insert approx


Resummed vevs


Resummed vevs





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!


VEV insert approx


Resummed vevs


Resummed vevs





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!


VEV insert approx


Resummed vevs


Resummed vevs


Neglect o-d Σii Gijterms & approx Λ

Fullsolution




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!


VEV insert approx


Resummed vevs


Resummed vevs


Neglect o-d Σii Gijterms & approx Λ

Fullsolution




Next steps:

1. Apply to realistic model (MSSM)

2. Fermions

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!


Leptogenesis

CPV decays

Washout

Flavor sensitive rxns

Gauge interactions

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CPV Asymmetries: Soft LeptogenesisFormalism: Kadanoff-Baym to Boltzmann


!


Soft Leptogenesis 0901.0008,1009.0003, 1107.5312

Including finite-T statistics for externalstates in Boltzmann equations

Sizeable Yl withTeV scale dof:

Interestingphenomenology ?

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CPV Asymmetries: Soft LeptogenesisFormalism: Kadanoff-Baym to Boltzmann


!


Soft Leptogenesis 1307.0524, Garbrecht & MR-M

Vanishing Yl : canceling contributions when stat’s included on all lines

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!


EW Baryogenesis

ACPBSM ! ACP

SM

“Superequilibrium”

Diffusion

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Collision Terms: Transfer ReactionsFormalism: Kadanoff-Baym to Boltzmann


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MSSM: ~ 30 Coupled Eqns

Topological transitions

MSSM: Chung, Garbrecht, R-M, Tulin ‘09

Bubble interior

Bubble exterior

LH leptons

LH quarksLH fermions

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!



Thanks: B. Garbrecht

Topological transitions

MSSM: Chung, Garbrecht, R-M, Tulin ‘09

Bubble interior

Bubble exterior

LH leptons

LH quarksLH fermions

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!


Small tanβ

tanβ=20

muon g-2 !

Chung, Garbrecht, R-M, Tulin


Thanks: B. Garbrecht

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New Direction: Flavored CPV & EWBFormalism: Kadanoff-Baym to Boltzmann


!


General 2HDM

?

!(x)bs

Liu, R-M, Shu ‘11;see also Tulin &Winslow ‘11; Clineet al ‘11

Combinationof Hu,d vevs

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New Direction: Flavored CPV & EWBFormalism: Kadanoff-Baym to Boltzmann


!


General 2HDM

Liu, R-M, Shu ‘11;see also Tulin &Winslow ‘11; Clineet al ‘11

constant nB / s

LHCb

Tevatron w/osame-sign Aµµ

Tevatron: same-sign Aµµ

included

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Outlook

• Robust tests of low-scale baryogenesis scenarios !Refine theoretical machinery for computingasymmetries in out-of-equilibrium contexts

• Important for evaluating viability of TeV scalescenarios in light of phenomenological input: EDMs,flavored CPV, precision tests (g-2,…)

• Recent advances exploiting Schwinger-Keldysh/CTP formulation are providing a moresystematic treatment

• Considerable room for future theoretical progressexists: fermion CPV sources, low-scaleleptogenesis…

transport theory for ew baryogenesis & leptogenesis · 3 transport issues • how robustly can...

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