eprintid: 17762
rev_number: 11
eprint_status: archive
userid: 1520
dir: disk0/00/01/77/62
datestamp: 2014-12-02 13:40:02
lastmod: 2014-12-03 13:27:53
status_changed: 2014-12-02 13:40:02
type: doctoralThesis
metadata_visibility: show
creators_name: Kraus, Sebastian
title: New Inflationary Scenarios from D7-Brane Dynamics
subjects: ddc-530
divisions: i-130300
adv_faculty: af-13
abstract: We analyze whether a D7-brane position modulus in Type IIB string compactifications can be a suitable inflaton candidate. To this end, we study two rather different scenarios: In the first, the inflaton is associated with the distance of two D7-branes. Inflation is driven by a brane-flux-induced D-term energy and proceeds as the branes approach each other. It ends in a tachyonic instability. This model thus represents a string-theoretic version of D-term hybrid inflation. In the second model, the inflaton is the position modulus of a single D7-brane. During inflation this modulus traverses a large distance in Planck units. This is possible due to a monodromy in field space. The brane displacement leads to a continuously changing F-term energy which drives (chaotic) inflation. We explicitly analyze the intricate interplay of each scenario with moduli stabilization. In particular, since Kähler moduli are fixed by higher-order terms in the scalar potential, their masses are typically relatively small. We demonstrate that, nonetheless, in our models the inflaton potential does not upset Kähler moduli stabilization. Finally, we show that both models can be in agreement with the most recent cosmological observations, while their implications for the size of the tensor-to-scalar ratio are very different.
date: 2014
id_scheme: DOI
id_number: 10.11588/heidok.00017762
ppn_swb: 1653815914
own_urn: urn:nbn:de:bsz:16-heidok-177625
date_accepted: 2014-11-26
advisor: HASH(0x55d997b76490)
language: eng
bibsort: KRAUSSEBASNEWINFLATI2014
full_text_status: public
citation:   Kraus, Sebastian  (2014) New Inflationary Scenarios from D7-Brane Dynamics.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/17762/1/PhD-Thesis_SebastianKraus.pdf