the large volume string scenarios
DESCRIPTION
The LARGE Volume String Scenarios. F. Quevedo, Cambridge/ICTP. Havana, Cuba 2012. J. Conlon, V. Balasubramanian, P. Berglund, FQ +….since 2005 M. Dolan, S. Krippendorf, FQ; arXiv:1106… S. Krippendorf, M. Dolan, A. Maharana, FQ; arXiv:1002.1790 C. Burgess, A. Maharana, FQ; arXiv:1005.1199 - PowerPoint PPT PresentationTRANSCRIPT
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The LARGE Volume String Scenarios
F. Quevedo, Cambridge/ICTP. Havana, Cuba 2012.
J. Conlon, V. Balasubramanian, P. Berglund, FQ +….since 2005M. Dolan, S. Krippendorf, FQ; arXiv:1106…S. Krippendorf, M. Dolan, A. Maharana, FQ; arXiv:1002.1790C. Burgess, A. Maharana, FQ; arXiv:1005.1199C. Burgess, M. Cicoli, M. Gomez-Reino, FQ, G. Tasinato, I. Zavala; arXiv1005.4840M.Cicoli, S. Krippendorf, C. Mayrhofer, FQ, R. Valandro; arXiv1206.5237
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Recall LHC is running: Hierarchy Problem Proposals
• TeV SUSY
• Warped extra dimensions
• Large extra dimensions
• …UV complete? How to fix size of extra dimensions?Unification, Flavour, Proton stability,…
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String Theory• Particles ‘look like’ strings
• (Super) Gravity is included
• Can unify all particles and interactions (Einstein’s dream)
• Universe lives in 10 (11) dimensions !!!
• For our universe 10d = 4d+6d (6d very small?)
• Dimensionful scale: Ms.
• Many couplings: Moduli (1/g2=T)
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String Phenomenologists:
Strategic (long term) Plan:String theory scenario that satisfies
all particle physics and cosmological observations and
hopefully lead to measurable predictions
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String Phenomenology
• Too many string models?
(Heterotic, IIA, I, IIB, Landscape,...)
• Or too ‘few’ models?
(Realistic?)
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Challenges for String Models
• Gauge and matter structure of SM• Hierarchy of masses (including neutrinos)• Flavor CKM, PMNS mixing, CP no FCNC• Hierarchy of gauge couplings (unification?)• ‘Stable’ proton + baryogenesis• Dark matter (+ avoid overclosing)• Inflation or alternative for CMB fluctuations• Dark energy
N.B. If ONE of them does not work, rule out the model!!!
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String Model Building:
Global Models (e.g. Heterotic)
Local Brane Models (e.g. IIB)
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Bottom-up Approach
• Gauge group• Chiral spectrum• Yukawa couplings• Gauge couplings• Proton stability• Flavour symmetries
• Moduli Stabilisation• Cosmological constant • SUSY Breaking• Scales (unification,
axions,…)• Inflation, Reheating• Cosmological moduli
problem
Local (brane) Properties Global (bulk) Properties
Aldazabal,Ibanez, FQ, Uranga 2000Aldazabal,Ibanez, FQ, Uranga 2000
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MODULI STABILISATION
4-cycle size: τ (Kahler moduli)
3-cycle size: U (Complex structure moduli)
+ String Dilaton: S
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LARGE Volume Scenario
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IIB Moduli Stabilisation
Type IIB String on Calabi-Yau orientifold
Turn on Fluxes ∫a F3 = n a ∫b H3 = m b
Superpotential W = ∫ G3 Λ Ω, G3 = F3 –iS H3
Scalar Potential: V= eK |DaW|2
Minimum DaW = 0 Fixes Ua and S T moduli unfixed: No-Scale models
Size of cycle a = USize of cycle a = Uaa
GKPGKP
……GKP, KKLT, …GKP, KKLT, …
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Kahler moduli?
Simple example:P4
11169
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Exponentially Large Volumes
Example :
BBCQ, CQS (2005)BBCQ, CQS (2005)
Exponentially large volumen + Broken SUSY!!!
Fluxes
Volume
Perturbative (alpha’) corrections to K
Nonperturbative corrections to W
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General Conditions for LARGE Volume
• h12 > h11 > 1
• At least one blow-up mode (point-like singularity)
• Blow-up mode fixed by non-perturbative effects, volume by alpha’ corrections, other (fibre) by loop corrections.
Cicoli, Conlon, FQ
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e.g.Swiss Cheese Calabi-Yau’s
Very generic
Blumenhagen, et al., Grimm et al., Kreuzer et al. 08
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e.g.: Anisotropic Moduli Fixing
• K3 Fibrations:
Poly-Instantons
K3 ! size t22
i=3, j=1
Blumenhagen et al.
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(For W0=10, g s=0.01, etc.)
Living on the edge!!
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Relevant Scales
• String scale Ms=MP/V 1/2
• Kaluza-Klein scale MKK=MP/V 2/3
• Gravitino mass m3/2=W0 MP/V
• Volume modulus mass MV=Mp/V 3/2
• Lighter (fibre) moduli Ml=Mp/V 5/3
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General Scenarios• MString = MGUT~ 1016 GeV (V~105)
• W0~10-11<<1 (or W0~1 plus warping) to get TeV soft terms• Fits with coupling unification• Natural scale of most string inflation models.• Axi-volume quintessence scale (w=-0.999….)
• MString = Mint.~ 1012 GeV (V~1015) • W0~1• m3/2~1 TeV (solves hierarchy problem!!!)• QCD axion scale• neutrino masses LLHH
• MString = 1 TeV (V~1030)
• W0~1• Most exciting, 5th Force OK m~10-3 eV, if SM non SUSY. Back reaction?
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Cosmological Inflation
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Kähler Moduli Inflation (Blow-up)
Calabi-Yau: h2121>>h1111>2
volume τn
V
Conlon-FQ Conlon-FQ
Bond et al.Bond et al.
……
Small field inflation (r<<<1)
No fine-tuning!!
0.960<n<0.967
Loop corrections??
~
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V
Fibre InflatonsBurgess, Cicoli, FQ
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Ne
ns
ns
r r
Observable gravity waves !
(can be ruled out by Planck if they observe them and CMBpol… if they do not observe them)
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Stringy Curvaton Scenario
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Curvaton Mass:
Non-Gaussianities
Examples
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Model Building
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LARGE Volume Implies
Standard Model is localised ! ( SM D7 cannot wrap the exponentially large cycle
since g2=1/V2/3 )
‘Bottom-up’ (AIQU 2000) Fractional D3/D7 Brane at a singularity (collapsed cycle)
Magnetised D7 - Brane wrapping a ‘small’ four-cycle
Local F-Theory
Blumenhagen et al.
Donagi, Wijnholt; Vafa, Heckman, …
Aldazabal et al.
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UniverseUniverse
D3 BraneD3 Brane
oror
D7 BraneD7 Brane
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D3 Branes at Singularities
•Orbifolds •Del Pezzos 0-8
(dPn=P2 blown-up at n arbitrary points
c1>0, b2=n+1, 2n-8 parameters, n>3)
•Larger class: Toric singularities (infinite class of models!!!)
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Toric Singularities
Einstein-Sasaki
T3 Fibration Over rational polyhedral cone
Toric Diagram
D3-branes
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Spectrum and couplings
Dimer and Quiver Diagrams (e.g. dP0)
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Del Pezzo Singularities/Quivers
e.g. del Pezzo 0 (C3/Z3)
ni D3 Branes (group ПU(ni))
mj D7 Branes (group ПU(mi))
Arrows=bi-fundamentals
Anomaly/tadpole cancelation
Hypercharge (ni≠nj)
3 Families!
D7s:Franco-Uranga
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Standard Models LR-Symmetric Models
Pati-Salam Models Trinification Models
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General Results Toric1.Maximum number of families = 3 (except for one case F0 with 4 families,
dual to a 2-family model, also non-toric phases unbounded)
2. Quark Mass hierarchy: (M,m,0) with M>>m
(structure of Yukawas imply one zero e-value, only dP0 has m=M)
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‘Realistic’ ‘Pati-Salam’ Model (dP3)
• Break symmetry to SM (+ U(1) or LR)• Breaking U(1) to SM: RH sneutrino (R-
parity broken)• Quark+ lepton mass hierarchies• See-saw neutrino masses• Stable proton• CKM, CP• Controlled kinetic terms!! !!!• Gauge Unification
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Generic Features
• Approximate Flavour Symmetries
• Hyperweak Interactions (SM fields charged under D7 gauge
interactions g2=1/V2/3 <<<1)
Burgess et al. 2008
Conlon, Maharana, FQ
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SUSY BREAKING
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SUSY Breaking
• Approximate Universality
• Two cases: FSM≠0 soft terms~m3/2
Ms~1012
GeV
FSM=0 soft terms <<m3/2
or~m3/2
CAQS, Conlon (Mirror Mediation)
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SM Cycle does not break SUSY
‘Fayet-Iliopoulos’ 0
‘Sequestered moduli/gravity mediated SUSY Breaking’
No-scale (vanishing soft terms) Suppressed !
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Different Scenarios
• Scalars 1/V3/2, others 1/V2
• All a/V3/2
• All 1/V2 (No CMP, unification, inflation !!!)
• Loop corrections ~ b/V5/3
• Mstring~1013-1015 GeV
• Field redefinitions at loop order: soft terms 1/V except ‘ultra-local’ SM at D3.
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Global Embedding and Moduli Stabilisation
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Global Picture
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Classification from Toric Ambient Spaces
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Consistency Constraints
• Orientifolding induces orientifold planes with non zero 3-7 charges
• D7 tadpoles
• D5 tadpoles
• D3 tadpoles
• Freed-Witten anomaly
• K-theory charges
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dP0 (ultra-local)Trinification
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dPn ultra local
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Moduli Stabilisation
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CONCLUSIONS• Continuous progress on local string models
(TeV warping, TeV gravity, TeV SUSY,…!?)
• Several SUSY breaking scenarios (m~m3/2, m3/2
3/2/Mp1/2, m3/2
2/Mp ), (Ms~103 – 1016 GeV)
• Concrete models of inflation (gravity waves and non-gaussianities)
• Local models: Global embedding and Moduli Stabilisation!!!
• All known ingredients used: geometry, fluxes, branes, perturbative, non-perturbative effects
• Many open questions