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Participant |
Uzawa, Kunihito | |||||||
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Institution |
Kwansei Gakuin university - 2-1 Gakuen - Sanda - Hyogo - Japan | |||||||
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Session |
BS2 |
Accepted |
Yes |
Order |
8 |
Time |
17:45 | 15' |
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Talk |
Oral abstract |
Title |
No-Go theorems for ekpyrosis from ten-dimensional supergravity | |||||
| Coauthors | ||||||||
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Abstract |
In this talk, we discuss whether the new ekpyrotic scenario can be embedded into ten-dimensional supergravity. We use that the scalar potential obtained from flux compactifications of type II supergravity with sources has a universal scaling with respect to the dilaton and the volume mode. Similar to the investigation of inflationary models, we find very strong constraints ruling out ekpyrosis from analysing the fast-roll conditions. We conclude that flux compactifications tend to provide potentials that are neither too flat and positive (inflation) nor too steep and negative (ekpyrosis). |
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Pdf file |
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Session |
EU2C |
Accepted |
Yes |
Order |
1 |
Time |
15:15 | 15' |
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Talk |
Oral abstract |
Title |
Supersymmetry and singularity in a dynamical M-brane background | |||||
| Coauthors | Kengo Maeda | |||||||
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Abstract |
The supersymmetry arises in certain theories of fermions coupled to gauge fields and gravity in a spacetime of 11 dimensions. The dynamical brane background has mainly been studied for the class of purely bosonic solutions only, but recent developments involving a time-dependent brane solution have made it clear that one can get more information by asking what happens on supersymmetric systems. In this talk, we present an exact supersymmetric solution of a dynamical M-brane background in the 11-dimensional supergravity and investigate supersymmetry breaking, the geometric features near the singularity. |
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Pdf file |
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