Cumrun Vafa Harvard University String Phenomenology 2019 CERN ID: 813225
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Slide1
A Swampland Update
Cumrun Vafa
Harvard University
String Phenomenology 2019
CERN
June 25, 2019
Slide2Slide3Plan for this talk:
-Finite Tuning and Sequestering
-Branes and the Swampland
-AdS and the Swampland
-Fading Dark Sector and the Swampland
Slide4Fine Tuning and Sequestering
Slide5Slide6Only a finite number of CFT’s don’t belong to the Swampland!
Example: N=4 YM with rank(G)>22 in Swampland!
Only partial Sequestering possible
Slide7Branes and the Swampland
One of the swampland conditions:
Spectrum is complete.
If so we can use this to study consistency of putative brane theories interacting with the bulk and the rest of the branes.
We apply this idea to 1-branes for
N=(1,0) supersymmetric theories in 10d and 6d.
Slide8Anomaly cancellations (both gravitational and gauge anomalies) are crucial for consistency of these theories:
Slide9Anomaly cancellations involve Green-Schwarz mechanism. B-fields, play key role.
Slide10Similarly in 6d case we get:
Slide11This eliminates an infinite number of theories which are anomaly free. Example:
Slide12AdS and Swampland
Ordinary distance conjecture: [
Ooguri,V
]
Slide13Generalized formulation of distance conjecture leads to new statements:
AdS:
Slide14Slide15This turns out to be related to two other swampland conjectures:
Refined dS conjecture:
Bounded number of massless modes.
Slide16This turns out to be related to two other swampland conjectures:
Refined dS conjecture:
Bounded number of massless modes.
Slide17Fading Dark Sector and the Swampland
dS Swampland conjecture forbids quasi-dS.
If so, current cosmology must be governed by a quintessence field. But it seems variation of the quintessence field has been already order 1 in Planck units. So we should expect a tower of light states;
The Dark Sector!
Slide18Slide19Slide20Slide21Better fit than by
Moreover as a by-product, our model automatically improves the H0 (and S8) tension.
Dark matter fading by 10% beginning around redshift z=15.
Slide22Slide23Dark matter fading by 10% beginning around redshift z=15.
Slide24Connections
Slide25Connections
Slide26Connections
Slide27Slide28Slide29Recalling that scalar fields typically come from
vev
of internal metric and anti-symmetric field leads to a generalization: