double field theory and non-geometric backgrounds
TRANSCRIPT
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Double Field Theory and Non-Geometric Backgrounds: Dimensional Reduction and Cosmological ApplicationsDIETER LÜST (LMU, MPI)
String-Pheno Conference 2014: ICTP Trieste, July 11, 2014
Donnerstag, 10. Juli 14
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O. Hohm, D.L., B. Zwiebach, arXiv:1309.2977;F. Hassler, D.L., arXiv:1401.5068;
F. Hassler, D.L., S. Massai, arXiv:1405.2325
Double Field Theory and Non-Geometric Backgrounds: Dimensional Reduction and Cosmological ApplicationsDIETER LÜST (LMU, MPI)
String-Pheno Conference 2014: ICTP Trieste, July 11, 2014
Donnerstag, 10. Juli 14
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Outline:
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I) Introduction
II) Double Field Theory and Dimensional Reduction on Non-geometric Backgrounds
III) De Sitter and Inflation
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Non-geometric backgrounds are generic within the landscape of string „compactifications“.Several interesting features:
● They are only consistent in string theory.
● They can be potentially used for the construction of de Sitter vacua and inflation
● Left-right asymmetric spaces ⇒ Asymmetric orbifolds(Kawai, Lewellen, Tye, 1986; Lerche, D.L. Schellekens, 1986, Antoniadis, Bachas, Kounnas, 1987; Narain, Sarmadi, Vafa, 1987;
Ibanez, Nilles, Quevedo, 1987; ......, Faraggi, Rizos, Sonmez, 2014)
● Make use of string symmetries, T-duality ⇒ T-folds,
(Hertzberg, Kachru, Taylor, Tegmark, 2007; Caviezel, Köerber, Körs, D.L., Wrase, 2008;Danielsson, Haque, Shiu, Underwood, Van Riet, 2009; Daniellson, Haque, Koerber, Shiu, Van Riet, 2011;
Dall‘Agata, Inverso, 2012;Blabäck, Danielsson, Dibitetto, 2013; Damian, Diaz-Barron, Loaiza-Brito, Sabido, 2013)
● Effective gauged supergravity (Dall‘Agata, Villadoro, Zwirner, 2009; Nicolai, Samtleben,2001; Dibitetto, Linares, Roest, 2010; ...)
I) Introduction
● Are related to non-commutative/non-associative geometry(Blumenhagen, Plauschinn; Lüst, 2010; Blumenhagen, Deser, Lüst, Rennecke, Pluaschin, 2011;
Condeescu, Florakis, Lüst; 2012, Andriot, Larfors, Lüst, Patalong, 2012))
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SUGRA
CY
Flux comp.
DFT
Non-Geometric spaces
Non-geometric spaces ⇔ Double Field Theory
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II) Non-geometry & double field theory
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Closed string background fields: Gij , Bij , �II) Non-geometry & double field theory
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XM = (Xi, Xi)
Doubling of closed string coordinates and momenta:
- Coordinates: O(D,D) vector
- Momenta: O(D,D) vector
winding momentum
pM = (pi, pi)
← T-duality →
Closed string background fields: Gij , Bij , �II) Non-geometry & double field theory
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XM = (Xi, Xi)
Doubling of closed string coordinates and momenta:
- Coordinates: O(D,D) vector
- Momenta: O(D,D) vector
winding momentum
pM = (pi, pi)
← T-duality →
Closed string background fields: Gij , Bij , �
Generalized metric: HMN =✓
Gij �GikBkj
BikGkj Gij �BikGklBlj
◆
II) Non-geometry & double field theory
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XM = (Xi, Xi)
Doubling of closed string coordinates and momenta:
- Coordinates: O(D,D) vector
- Momenta: O(D,D) vector
winding momentum
pM = (pi, pi)
← T-duality →
Closed string background fields: Gij , Bij , �
T-duality - O(D,D) transformations:
They contain: Bij ! Bij + 2⇡⇤ij ,
HMN ! ⇤PM HPQ ⇤Q
N , ⇤ 2 O(D,D)R ! L2
s/R
Generalized metric: HMN =✓
Gij �GikBkj
BikGkj Gij �BikGklBlj
◆
II) Non-geometry & double field theory
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Non-geometric backgrounds & non-geometric fluxes:
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(Hellerman, McGreevy, Williams (2002); C. Hull (2004); Shelton, Taylor, Wecht (2005); Dabholkar, Hull, 2005)
- Non-geometric Q-fluxes: spaces that are locally still Riemannian manifolds but not anymore globally.
Transition functions between two coordinate patches are given in terms of O(D,D) T-duality transformations:
Di↵(MD) ! O(D,D)C. Hull (2004)
Non-geometric backgrounds & non-geometric fluxes:
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- Non-geometric R-fluxes: spaces that are even locally not anymore manifolds.
(Hellerman, McGreevy, Williams (2002); C. Hull (2004); Shelton, Taylor, Wecht (2005); Dabholkar, Hull, 2005)
- Non-geometric Q-fluxes: spaces that are locally still Riemannian manifolds but not anymore globally.
Transition functions between two coordinate patches are given in terms of O(D,D) T-duality transformations:
Di↵(MD) ! O(D,D)C. Hull (2004)
Non-geometric backgrounds & non-geometric fluxes:
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Example: Three-dimensional flux backgrounds:
Fibrations: 2-dim. torus that varies over a circle:
The fibration is specified by its monodromy properties.
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T 2 :
S1
O(2,2) monodromy:
T 2X1,X2 ,! M3 ,! S1
X3
HMN (X3)Metric, B-field of
HMN (X3 + 2⇡) = ⇤O(2,2) HPQ(X3) ⇤�1O(2,2)
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Example: Three-dimensional flux backgrounds:
Fibrations: 2-dim. torus that varies over a circle:
The fibration is specified by its monodromy properties.
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T 2 :
S1
O(2,2) monodromy:
T 2X1,X2 ,! M3 ,! S1
X3
Complex structure of :
Kähler parameter of :
T 2
T 2 ⇢(X3 + 2⇡) =a0⇢(X3) + b0
c0⇢(X3) + d0
⌧(X3 + 2⇡) =a⌧(X3) + b
c⌧(X3) + d⌧
⇢
HMN (X3)Metric, B-field of
HMN (X3 + 2⇡) = ⇤O(2,2) HPQ(X3) ⇤�1O(2,2)
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Torus
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Torus with non-constant B-field (H-flux), B-field is patched together by a B-field (gauge) transformation: B ! B + 2⇡H
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Non geometric torus, metric is patched together by a T-duality transformation: Gij ! Gij
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Non geometric torus, metric is patched together by a T-duality transformation: Gij ! Gij
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3-dimensional fibration:
Twisted torus with f-flux
S1
⌧(X3 + 2⇡) = � 1⌧(X3)
S1X3
T 2X1X2
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3-dimensional fibration:
Non-geometric space with Q-flux
⇢(X3 + 2⇡) = � 1⇢(X3)
T 2X1X2
S1X3
S1
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Chain of four T-dual spaces:
(i) (Non-)geometric backgrounds with parabolic monodromy and single 3-form fluxes:
Tx1 Tx2 Tx3Flat torus
with constant H-flux
Twisted torus with
f-flux
Non-geometric space with
Q-flux
Non-geometric space with
R-flux
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Chain of four T-dual spaces:
(i) (Non-)geometric backgrounds with parabolic monodromy and single 3-form fluxes:
Tx1 Tx2 Tx3Flat torus
with constant H-flux
Twisted torus with
f-flux
Non-geometric space with
Q-flux
Non-geometric space with
R-flux
Linear B-field
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Chain of four T-dual spaces:
(i) (Non-)geometric backgrounds with parabolic monodromy and single 3-form fluxes:
Tx1 Tx2 Tx3Flat torus
with constant H-flux
Twisted torus with
f-flux
Non-geometric space with
Q-flux
Non-geometric space with
R-flux
Linear B-field
(Nilmanifold)
Linear metric
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Chain of four T-dual spaces:
(i) (Non-)geometric backgrounds with parabolic monodromy and single 3-form fluxes:
Tx1 Tx2 Tx3Flat torus
with constant H-flux
Twisted torus with
f-flux
Non-geometric space with
Q-flux
Non-geometric space with
R-flux
Linear B-field non-linear metric and B-field
(Nilmanifold)
Linear metric
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Chain of four T-dual spaces:
(i) (Non-)geometric backgrounds with parabolic monodromy and single 3-form fluxes:
Tx1 Tx2 Tx3Flat torus
with constant H-flux
Twisted torus with
f-flux
Non-geometric space with
Q-flux
Non-geometric space with
R-flux
Linear B-field non-linear metric and B-field
(Nilmanifold)
Linear metricno local metric and B-field
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(ii) (Non-)geometric backgrounds with elliptic monodromy and multiple, (non)-geometric fluxes.
They can be described in terms of twisted tori and (a)symmetric freely acting orbifolds.
C. Condeescu, I. Florakis, D. Lüst, JHEP 1204 (2012), 121, arXiv:1202.6366C. Condeescu, I. Florakis, C. Kounnas, D.Lüst, arXiv:1307.0999
D. Lüst, JHEP 1012 (2011) 063, arXiv:1010.1361,
In general not T-dual to a geometric space!Only consistent in string theory, respectively in DFT.
The fibre torus depends on the third coordinate in a more complicate way.
A. Dabholkar, C. Hull (2002, 2005)
C. Hull; R. Read-Edwards (2005, 2006, 2007, 2009)
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Double field theory action:W. Siegel (1993); C. Hull, B. Zwiebach (2009); C. Hull, O. Hohm, B. Zwiebach (2010,...)
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Double field theory action:
• O(D,D) invariant effective string action containing momentum and winding coordinates at the same time:
X
M = (xm, x
m)SDFT =Z
d2DX e�2�0R
R = 4HMN@M�0@N�0 � @M@NHMN �4HMN@M�0@N�0 + 4@MHMN@N�0
+18HMN@MHKL@NHKL � 1
2HMN@NHKL@LHMK
W. Siegel (1993); C. Hull, B. Zwiebach (2009); C. Hull, O. Hohm, B. Zwiebach (2010,...)
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Double field theory action:
• O(D,D) invariant effective string action containing momentum and winding coordinates at the same time:
X
M = (xm, x
m)SDFT =Z
d2DX e�2�0R
R = 4HMN@M�0@N�0 � @M@NHMN �4HMN@M�0@N�0 + 4@MHMN@N�0
+18HMN@MHKL@NHKL � 1
2HMN@NHKL@LHMK
W. Siegel (1993); C. Hull, B. Zwiebach (2009); C. Hull, O. Hohm, B. Zwiebach (2010,...)
• Covariant fluxes of DFT:(Geissbuhler, Marques, Nunez, Penas; Aldazabal, Marques, Nunez)
FABC = D[AEBM EC]M , DA = EA
M @M .
Comprise all fluxes (Q,f,Q,R) into one covariant expression:Fabc = Habc , Fa
bc = F abc , Fc
ab = Qcab , Fabc = Rabc
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DFT action in flux formulation:SDFT =
ZdX e�2d
FAFA0SAA0
+ FABCFA0B0C0
⇣14SAA0
⌘BB0⌘CC0
� 112
SAA0SBB0
SCC0⌘
� 16FABC FABC � FAFA
�
(Looks similar to scalar potential in gauged SUGRA.)
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• Strong constraint (string level matching condition):
@M@M · = 0 , @Mf @Mg = DAf DAg = 0
(CFT origin of the strong constraint: A. Betz, R. Blumenhagen, D. Lüst, F. Rennecke, arXiv:1402.1686)
The strong constraint defines a D-dim. hypersurface (brane) in 2D-dim. double geometry.
Functions depend only on one kind of coordinates.
DFT action in flux formulation:SDFT =
ZdX e�2d
FAFA0SAA0
+ FABCFA0B0C0
⇣14SAA0
⌘BB0⌘CC0
� 112
SAA0SBB0
SCC0⌘
� 16FABC FABC � FAFA
�
(Looks similar to scalar potential in gauged SUGRA.)
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Implementations of the strong constraint:
(ii) DFT on spaces with „mild violation“ of the SC
(i) DFT on spaces satisfying the strong constraint (SC)
Rewriting of SUGRA, geometric spaces
(iii) DFT on spaces with „strong violation“ of the SC
Non-geometric spaces (Q-flux)
Very non-geometric spaces (R-flux)
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Dimensional reduction of double field theory:
string theory
SUGRA
matching
amplitudes
D � d SUGRA
with
ou
tflu
xe
s
gauged
SUGRA
w
i
t
h
fl
u
x
e
s
(
o
n
l
y
s
u
b
s
e
t
)
embedding
tensor
sim
plifica
tio
n(tru
nca
tio
n)
Generalized Scherk-Schwarz compactifications
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Dimensional reduction of double field theory:
Generalized Scherk-Schwarz compactifications
string theory
SUGRA
matching
amplitudes
Double Field Theory
S
F
T
@i · = 0
D � d SUGRA
with
ou
tflu
xe
s
gauged
SUGRA
w
i
t
h
fl
u
x
e
s
(
o
n
l
y
s
u
b
s
e
t
)
embedding
tensor
sim
plifica
tio
n(tru
nca
tio
n)
SC
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Dimensional reduction of double field theory:
Generalized Scherk-Schwarz compactifications
string theory
SUGRA
matching
amplitudes
Double Field Theory
S
F
T
@i · = 0
D � d SUGRA
with
ou
tflu
xe
s
gauged
SUGRA
w
i
t
h
fl
u
x
e
s
(
o
n
l
y
s
u
b
s
e
t
)
embedding
tensor
sim
plifica
tio
n(tru
nca
tio
n)
Violation of SCNon-geometric space
SC
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Dimensional reduction of double field theory:
Generalized Scherk-Schwarz compactifications
string theory
SUGRA
matching
amplitudes
Double Field Theory
S
F
T
@i · = 0
D � d SUGRA
withoutfluxes
gauged
SUGRA
w
i
t
h
fl
u
x
e
s
(
o
n
l
y
s
u
b
s
e
t
)
embedding
tensor
Vacuum
e.o.m.
sim
plification
(truncation)
SCViolation of SC
Non-geometric space
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Dimensional reduction of double field theory:
Generalized Scherk-Schwarz compactifications
string theory
SUGRA
matching
amplitudes
Double Field Theory
S
F
T
@i · = 0
D � d SUGRA
with
ou
tflu
xe
s
gauged
SUGRA
w
i
t
h
fl
u
x
e
s
(
o
n
l
y
s
u
b
s
e
t
)
embedding
tensor
Vacuum
e.o.m.
up
lift
sim
plifica
tio
n(tru
nca
tio
n)
SCViolation of SC
Non-geometric space
Asymmetricorbifold CFT
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Dimensional reduction of double field theory:
• Consistent DFT solutions:
• 2(D-d) linear independent Killing vectors:
LKJIHMN = 0
RMN = 0
• DFT and Scherk-Schwarz ansatz gives rise to effective theory in D-d dimensions:
Se↵ =Z
dx(D�d)p�ge�2�⇣R+ 4@µ�@µ�� 1
12Hµ⌫⇢H
µ⌫⇢
�14HMNFMµ⌫FN
µ⌫ +18DµHMNDµHMN � V
⌘
O. Hohm, D. Lüst, B. Zwiebach, arXiv:1309.2977;F. Hassler, D. Lüst, arXiv:1401.5068.
D. Berman, K. Lee, arXiv:1305.2747;D. Berman, E. Musaev, D. Thompson, arXiv:1208.0020;G. Aldazabal, W. Baron, D. Marques, C. Nunez, arXiv:1109.0290;
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• Effective scalar potential:
V = �14FK
ILFJKLHIJ +
112FIKMFJLNHIJHKLHMN
V = 0 and KMN =�V
�HMN= 0
This leads to additional conditions on the fluxes . FIKM
• ⇒ Minkowski vacua:RMN = 0
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The corresponding backgrounds are in general non- geometric and go beyond dimensional reduction of SUGRA.
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26
The corresponding backgrounds are in general non- geometric and go beyond dimensional reduction of SUGRA.
• Killing vectors violate the SC.
• Patching of coordinate charts correspond to generalized coordinate transformations that violate the SC.
(i) Mild violation of SC:
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26
The corresponding backgrounds are in general non- geometric and go beyond dimensional reduction of SUGRA.
• Killing vectors violate the SC.
• Patching of coordinate charts correspond to generalized coordinate transformations that violate the SC.
(i) Mild violation of SC:
(ii) Strong violation of SC:
• Background fields violate the SC.
However the fluxes have to obey the closure constraint - consistent gauge algebra in the effective theory.
M. Grana, D. Marques, arXiv:1201.2924
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27
SUGRA
CY
Flux comp.
D
F
T
+
S
C
DFT without the SC -non-geometric spaces
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Simplest non-trivial solutions: d=3 dim. backgrounds:
T 2X1X2
S1X3
S1
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Simplest non-trivial solutions: d=3 dim. backgrounds:
T 2X1X2
S1X3
S1
Parabolic background spaces: Single fluxes:
H123 f123 Q12
3 R123oror or
These backgrounds do not satisfy RMN = 0 .- CFT: beta-functions are non-vanishing at quadratic order in fluxes.
- Effective scalar potential: no Minkowski minima (⇒ AdS)
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29
Elliptic background spaces: Multiple fluxes:
These backgrounds do satisfy RMN = 0 .
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29
Elliptic background spaces: Multiple fluxes:
These backgrounds do satisfy RMN = 0 .
• Single elliptic geometric space (Solvmanifold):
f213 = f1
23 = f ⇒ Symmetric orbifold.ZL4 ⇥ ZR
4
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29
Elliptic background spaces: Multiple fluxes:
These backgrounds do satisfy RMN = 0 .
• Single elliptic T-dual, non-geometric space:H123 = Q12
3 = H
⇒ Asymmetric orbifold.ZL4 ⇥ ZR
4
• Single elliptic geometric space (Solvmanifold):
f213 = f1
23 = f ⇒ Symmetric orbifold.ZL4 ⇥ ZR
4
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29
Elliptic background spaces: Multiple fluxes:
These backgrounds do satisfy RMN = 0 .
• Double elliptic, genuinely non-geometric space:
H123 = Q123 = H , f2
13 = f123 = f
⇒ Asymmetric orbifold.ZL4
• Single elliptic T-dual, non-geometric space:H123 = Q12
3 = H
⇒ Asymmetric orbifold.ZL4 ⇥ ZR
4
• Single elliptic geometric space (Solvmanifold):
f213 = f1
23 = f ⇒ Symmetric orbifold.ZL4 ⇥ ZR
4
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30
E.g. double elliptic background:
=) ⌧(2⇡) = � 1⌧(0)
, ⇢(2⇡) = � 1⇢(0)
⌧(x3) =
⌧0 cos(fx3) + sin(fx3)
cos(fx3)� ⌧0 sin(fx3), f 2 1
4
+ Z ,
⇢(x3) =
⇢0 cos(Hx3) + sin(Hx3)
cos(Hx3)� ⇢0 sin(Hx3), H 2 1
4
+ Z .
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30
E.g. double elliptic background:
=) ⌧(2⇡) = � 1⌧(0)
, ⇢(2⇡) = � 1⇢(0)
⌧(x3) =
⌧0 cos(fx3) + sin(fx3)
cos(fx3)� ⌧0 sin(fx3), f 2 1
4
+ Z ,
⇢(x3) =
⇢0 cos(Hx3) + sin(Hx3)
cos(Hx3)� ⇢0 sin(Hx3), H 2 1
4
+ Z .
Background satisfies strong
constraint
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30
E.g. double elliptic background:
=) ⌧(2⇡) = � 1⌧(0)
, ⇢(2⇡) = � 1⇢(0)
⌧(x3) =
⌧0 cos(fx3) + sin(fx3)
cos(fx3)� ⌧0 sin(fx3), f 2 1
4
+ Z ,
⇢(x3) =
⇢0 cos(Hx3) + sin(Hx3)
cos(Hx3)� ⇢0 sin(Hx3), H 2 1
4
+ Z .
Patching is generated by generalized diffeomorphism:
Background satisfies strong
constraint
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30
E.g. double elliptic background:
=) ⌧(2⇡) = � 1⌧(0)
, ⇢(2⇡) = � 1⇢(0)
⌧(x3) =
⌧0 cos(fx3) + sin(fx3)
cos(fx3)� ⌧0 sin(fx3), f 2 1
4
+ Z ,
⇢(x3) =
⇢0 cos(Hx3) + sin(Hx3)
cos(Hx3)� ⇢0 sin(Hx3), H 2 1
4
+ Z .
Patching is generated by generalized diffeomorphism:
Background satisfies strong
constraint
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30
E.g. double elliptic background:
=) ⌧(2⇡) = � 1⌧(0)
, ⇢(2⇡) = � 1⇢(0)
⌧(x3) =
⌧0 cos(fx3) + sin(fx3)
cos(fx3)� ⌧0 sin(fx3), f 2 1
4
+ Z ,
⇢(x3) =
⇢0 cos(Hx3) + sin(Hx3)
cos(Hx3)� ⇢0 sin(Hx3), H 2 1
4
+ Z .
Patching is generated by generalized diffeomorphism:
Background satisfies strong
constraint
x3 ! x3 + 2⇡ ) x
01 = �x2 ,
x
02 = x
1,
x
01 = �x
2,
x
02 = x1 .
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30
E.g. double elliptic background:
=) ⌧(2⇡) = � 1⌧(0)
, ⇢(2⇡) = � 1⇢(0)
⌧(x3) =
⌧0 cos(fx3) + sin(fx3)
cos(fx3)� ⌧0 sin(fx3), f 2 1
4
+ Z ,
⇢(x3) =
⇢0 cos(Hx3) + sin(Hx3)
cos(Hx3)� ⇢0 sin(Hx3), H 2 1
4
+ Z .
Patching is generated by generalized diffeomorphism:
Background satisfies strong
constraint
Patching does not satisfy strong
constraintx3 ! x3 + 2⇡ ) x
01 = �x2 ,
x
02 = x
1,
x
01 = �x
2,
x
02 = x1 .
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30
E.g. double elliptic background:
=) ⌧(2⇡) = � 1⌧(0)
, ⇢(2⇡) = � 1⇢(0)
⌧(x3) =
⌧0 cos(fx3) + sin(fx3)
cos(fx3)� ⌧0 sin(fx3), f 2 1
4
+ Z ,
⇢(x3) =
⇢0 cos(Hx3) + sin(Hx3)
cos(Hx3)� ⇢0 sin(Hx3), H 2 1
4
+ Z .
Patching is generated by generalized diffeomorphism:
Corresponding Killing vectors of background:
K JI
=
0
BBBBBB@
1 0 0 0 0 00 1 � 1
2 (Hx3 + fx3) 12 (Hx2 + fx2) � 1
2 (fx3 + Hx3) 12 (fx2 + Hx2)
0 0 1 0 0 00 0 0 1 0 00 0 0 0 1 00 0 0 0 0 1
1
CCCCCCA
Background satisfies strong
constraint
Patching does not satisfy strong
constraintx3 ! x3 + 2⇡ ) x
01 = �x2 ,
x
02 = x
1,
x
01 = �x
2,
x
02 = x1 .
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30
E.g. double elliptic background:
=) ⌧(2⇡) = � 1⌧(0)
, ⇢(2⇡) = � 1⇢(0)
⌧(x3) =
⌧0 cos(fx3) + sin(fx3)
cos(fx3)� ⌧0 sin(fx3), f 2 1
4
+ Z ,
⇢(x3) =
⇢0 cos(Hx3) + sin(Hx3)
cos(Hx3)� ⇢0 sin(Hx3), H 2 1
4
+ Z .
Patching is generated by generalized diffeomorphism:
Corresponding Killing vectors of background:
K JI
=
0
BBBBBB@
1 0 0 0 0 00 1 � 1
2 (Hx3 + fx3) 12 (Hx2 + fx2) � 1
2 (fx3 + Hx3) 12 (fx2 + Hx2)
0 0 1 0 0 00 0 0 1 0 00 0 0 0 1 00 0 0 0 0 1
1
CCCCCCA
Background satisfies strong
constraint
Patching does not satisfy strong
constraint
Killing vectors do not satisfy strong constraint.
However their algebra closes!
x3 ! x3 + 2⇡ ) x
01 = �x2 ,
x
02 = x
1,
x
01 = �x
2,
x
02 = x1 .
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31
● There situations, where the strong constraint even for the background can be violated. - This seems to be the case for certain very asymmetric orbifolds. C. Condeescu, I. Florakis, C. Kounnas, D.Lüst, arXiv:1307.0999
This (partially?) solves a so far existing puzzle between effective SUGRA and uplift/string compactification.
Fluxes:
Asymmetric orbifold with H, f ,Q,R-fluxes.ZL4 ⇥ ZR
2
Parameter Fluxes
f4 f, ˜f
f2 Q, ˜Q
g4 H,Q
g2˜f,R
⌧(x3, x3) =
⌧0 cos(f4x3 + f2x3) + sin(f4x3 + f2x3)
cos(f4x3 + f2x3)� ⌧0 sin(f4x3 + f2x3), f4, g4 2
1
8
+ Z
⇢(x3, x3) =
⇢0 cos(g4x3 + g2x3) + sin(g4x3 + g2x3)
cos(g4x3 + g2x3)� ⇢0 sin(g4x3 + g2x3), f2, g2 2
1
4
+ Z
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32
III) De Sitter and Inflation F. Hassler, D. Lüst, S. Massai, arXiv:1405.2325
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32
III) De Sitter and Inflation
Effective scalar potential of double elliptic backgrounds:
V (⌧, ⇢) =1
R2
f21 + 2f1f2(⌧2
R � ⌧2I ) + f2
2 |⌧ |4
2⌧2I
+H2 + 2HQ(⇢2
R � ⇢2I) + Q2|⇢|4
2⇢2I
�� 0
F. Hassler, D. Lüst, S. Massai, arXiv:1405.2325
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32
III) De Sitter and Inflation
Effective scalar potential of double elliptic backgrounds:
V (⌧, ⇢) =1
R2
f21 + 2f1f2(⌧2
R � ⌧2I ) + f2
2 |⌧ |4
2⌧2I
+H2 + 2HQ(⇢2
R � ⇢2I) + Q2|⇢|4
2⇢2I
�� 0
The potential is positive semi-definite.
No up-lift is needed!
F. Hassler, D. Lüst, S. Massai, arXiv:1405.2325
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32
III) De Sitter and Inflation
Effective scalar potential of double elliptic backgrounds:
V (⌧, ⇢) =1
R2
f21 + 2f1f2(⌧2
R � ⌧2I ) + f2
2 |⌧ |4
2⌧2I
+H2 + 2HQ(⇢2
R � ⇢2I) + Q2|⇢|4
2⇢2I
�� 0
The potential is positive semi-definite.
No up-lift is needed!
Vacuum structure:
• Minkowski vacua: HQ > 0
⇢?R = 0 , ⇢?
I =
sH
Q, Vmin = 0
e.g. H = Q = 1/4 ⇒ Asymmetric orbifold.ZL4
F. Hassler, D. Lüst, S. Massai, arXiv:1405.2325
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33
• de Sitter vacua: HQ < 0
(⇢?R)2 + (⇢?
I)2 = �H
Q, Vmin = �4HQ > 0
However here the radius R is not stabilized.
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33
• de Sitter vacua: HQ < 0
(⇢?R)2 + (⇢?
I)2 = �H
Q, Vmin = �4HQ > 0
However here the radius R is not stabilized.
Another option: SO(2,2) gauging
V (⇢, ⌧) =H2
2⇢2I
�1 + 2(⇢2
R � ⇢2I) + |⇢|4
�+
H2
⇢I⌧I(1 + |⇢|2)(1 + |⌧ |2) +
H2
2⌧2I
�1 + 2(⌧2
R � ⌧2I ) + |⌧ |4
�
⇢? = ⌧? = i with Vmin = 4H2
All moduli and have positive mass square.⌧ ⇢
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34
Inflation from non-geometric backgrounds:
There are some attractive features for inflation:
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34
Inflation from non-geometric backgrounds:
There are some attractive features for inflation:
• The potentials are positive with quadratic and quartic couplings that depend on the (non)-geometric fluxes.
One needs to tune fluxes to obtain slow roll inflation.(⇒ Orbifolds with high order of twist!)
No up-lift is needed!
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34
Inflation from non-geometric backgrounds:
There are some attractive features for inflation:
• The non-trivial monodromies allow for enlarged field range of the inflaton field.
Realization of monodromy inflation in order to obtain a visible tensor to scalar ratio (gravitational waves).
(McAllsiter, Silverstein, Westphal, 2008)
• The potentials are positive with quadratic and quartic couplings that depend on the (non)-geometric fluxes.
One needs to tune fluxes to obtain slow roll inflation.(⇒ Orbifolds with high order of twist!)
No up-lift is needed!
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35
Enlarged field range for parabolic monodromy
⇢! ⇢ + 1 or ⌧ ! ⌧ + 1 :
⇒ Infinite field range for or .⌧R ⇢R
≠12
12≠3
232
i
. . .. . .
· , fl
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36
Enlarged field range for elliptic monodromy
or
Z4
⇢! �1⇢
⌧ ! �1⌧
:
⇒ Infinite field range for combinations of
and or combinations of and .⌧R ⇢R ⇢I⌧I
≠12
12
i
· , fl
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37
Enlarged field range for elliptic monodromy
or :⇢! �1⇢
+ 1 ⌧ ! �1⌧
+ 1
Z6
⇒ Infinite field range for combinations of
and or combinations of and .⌧R ⇢R ⇢I⌧I
≠12
12
32
i
· , fl
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38
Simple elliptic model for non-geometric inflation:
Kinetic energy:
Expect fluxes
Inflaton field:
Inflaton potential:
� =⇢R
2⇢I
V (�, ⇢I) = V0(⇢I) + m2(⇢I) �2 + �(⇢I)�4
Lkin =1
4⇢2I
(@⇢R)2 + (@⇢I)2
�H,Q ⇠ 1
N
V0(⇢I) =H2 � 2HQ⇢2
I + Q2⇢4I
2⇢2I
, m2(⇢I) = 4HQ + 4Q2⇢2I , �(⇢I) = 8Q2⇢2
I
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39
Inflaton mass and self-coupling:
Minimization with respect to :⇢I
m2 = 4HQ
✓1⇢?
I
+ ⇢?I
◆M2
s , � = 8HQ⇢?I
) V0 = 0
g2sM2
P�
m2=
2 (⇢?I)3
1 + (⇢?I)2
(M2P =
1g2
s
M2s ⇢?
I)
Small ⇒ small value for .
� ⇢?I
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40
Slow roll inflation with 60 e-foldings and
(BICEP2)
ns = 1� 6✏ + 2⌘ , r = 16✏
✏ =M2
P
2
✓@�V
V
◆2
, ⌘ = M2P
@2
�V
V
!
ns ⇠ 0.967 , r ⇠ 0.133
m ' 6⇥ 10�6MP , V 1/40 ' 10�2MP ) � ' 15MP
H 0 ' Q0 ' 10�5 , ⇢?I 10�2
⇒ Need very small fluxes (large monodromy )
and sub-stringy value for the volume of the fibre.
N ' 105
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IV) Summary
41
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IV) Summary
41
● DFT allows for consistent reduction on non-geometric backgrounds that go beyond SUGRA and also beyond generalized geometry.
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IV) Summary
41
● DFT allows for consistent reduction on non-geometric backgrounds that go beyond SUGRA and also beyond generalized geometry. ● Non-geometric backgrounds posses some attractive (generic) features for string cosmology:
- Uplift to Minkowski or de Sitter- Elliptic monodromy of finite order
⇒ Finite enlargement of field range for inflaton
⇒ Suppressed masses and couplings for inflaton
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IV) Summary
41
● DFT allows for consistent reduction on non-geometric backgrounds that go beyond SUGRA and also beyond generalized geometry.
● Particle physics model building and full moduli stabilization on non-geometric backgrounds still needs to be further developed.
● Non-geometric backgrounds posses some attractive (generic) features for string cosmology:
- Uplift to Minkowski or de Sitter- Elliptic monodromy of finite order
⇒ Finite enlargement of field range for inflaton
⇒ Suppressed masses and couplings for inflaton
Donnerstag, 10. Juli 14
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IV) Summary
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● DFT allows for consistent reduction on non-geometric backgrounds that go beyond SUGRA and also beyond generalized geometry.
● Particle physics model building and full moduli stabilization on non-geometric backgrounds still needs to be further developed.
Thank you very much!
● Non-geometric backgrounds posses some attractive (generic) features for string cosmology:
- Uplift to Minkowski or de Sitter- Elliptic monodromy of finite order
⇒ Finite enlargement of field range for inflaton
⇒ Suppressed masses and couplings for inflaton
Donnerstag, 10. Juli 14