An Energetics of Quasar

Sugimoto, Daiichiro

doi:10.1143/ptp.33.339

Cited by 73 publications

(215 citation statements)

References 1 publication

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“…This was noted in [8] with reference to the class of models of [12,13], but the effect can be ascribed, in general, to the larger values attained by the slow-roll parameter ǫ in the relevant region.…”

Section: Discussionmentioning

confidence: 90%

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Pre-inflationary relics in the CMB?

Gruppuso

Kitazawa

Mandolesi

et al. 2016

Physics of the Dark Universe

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String Theory and Supergravity allow, in principle, to follow the transition of the inflaton from pre-inflationary fast roll to slow roll. This introduces an infrared depression in the primordial power spectrum that might have left an imprint in the CMB anisotropy, if it occurred at accessible wavelengths. We model the effect extending ΛCDM with a scale ∆ related to the infrared depression and explore the constraints allowed by Planck 2015 data, employing also more conservative, wider Galactic masks in the low resolution CMB likelihood. In an extended mask with f sky = 39%, we thus find ∆ = (0.351±0.114)×10 −3 Mpc −1 , at 99.4% confidence level, to be compared with a nearby value at 88.5% with the standard f sky = 94% mask. With about 64 e-folds of inflation, these values for ∆ would translate into primordial energy scales O(10 14 ) GeV.

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Section: Discussionmentioning

confidence: 90%

“…On the other hand (see fig. 1), in the orientifold vacua [11] of String Theory with "Brane Supersymmetry Breaking" (BSB) [12,13] pre-inflationary peaks can lie well apart from the limiting profile, an option that appears favored by low CMB multipoles [9].…”

Section: Introductionmentioning

confidence: 99%

Pre-inflationary relics in the CMB?

Gruppuso

Kitazawa

Mandolesi

et al. 2016

Physics of the Dark Universe

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“…In particular, it is possible that an analysis analogous to ours would reveal that naked singularities appearing in Ref. [23] are also resolved by turning on a small positive brane cosmological constant. We hope to investigate some of these issues in the future.…”

mentioning

confidence: 70%

De Sitter spacetimes from warped compactifications of IIB string theory

2002

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We continue our study of codimension two solutions of warped spacetime varying compactifications of string theory. In this letter we discuss a non-supersymmetric solution of the classical type IIB string theory with de Sitter gravity on a codimension two uncompactified part of spacetime. A non-zero positive value of the cosmological constant is induced by the presence of non-trivial stringy moduli, such as the axion-dilaton system for the type IIB string theory. Furthermore, the naked singularity of the codimension two solution is resolved by the presence of a small but non-zero cosmological constant.

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“…These tadpoles are not eliminated by the magnetic deformation, and typically result in potentials that, although of run-away type for the dilaton, can in some cases stabilise some geometric moduli [15]. Their presence requires a background redefinition [33], that was recently constructed explicitly in [34] for the model in [35]. In general, these vacua correspond to supergravity models frozen in phases of broken supersymmetry, where the presence of (lower-dimensional) non-supersymmetric couplings renders the field equations naively inconsistent, in complete analogy with ordinary gauge theories frozen in a Higgs phase.…”

mentioning

confidence: 99%

Type-I strings on magnetised orbifolds and brane transmutation

Angelantonj¹,

Antoniadis

Dudas³

et al. 2000

Physics Letters B

315

433

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In the presence of internal magnetic fields, a D9 brane can acquire a D5 (or anti-D5) R-R charge, and can therefore contribute to the corresponding tadpole. In the resulting vacua, supersymmetry is generically broken and tachyonic instabilities are present. However, suitable choices for the magnetic fields, corresponding to selfdual configurations in the internal space, can yield new chiral supersymmetric vacua with gauge groups of reduced rank, where the magnetic energy saturates, partly or fully, the negative tension of the O5 + planes. These models contain Green-Schwarz couplings to untwisted R-R forms not present in conventional orientifolds.

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An Energetics of Quasar

Cited by 73 publications

References 1 publication

Pre-inflationary relics in the CMB?

Pre-inflationary relics in the CMB?

De Sitter spacetimes from warped compactifications of IIB string theory

Type-I strings on magnetised orbifolds and brane transmutation

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