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Brane SUSY Breaking and Inflation: Implications for Scalar Fields and CMB Distorsion
High Energy Physics - Theory · Submitted 26 Mar 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim In the presence of another mild exponential, slow--roll inflation is thus injected during the ensuing descent and definite imprints are left in the CMB power spectrum: the quadrupole is systematically reduced and, depending on the choice of two parameters, an oscillatory behavior can also emerge for low multipoles l < 50, in qualitative agreement with WMAP9 and PLANCK data.
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The abstract, sentence by sentence
I elaborate on a link between the string--scale breaking of supersymmetry that occurs in a class of superstring models and the onset of inflation. The link rests on spatially flat cosmologies supported by a scalar field driven by an exponential potential. If, as in String Theory, this potential is steep enough, under some assumptions that are spelled out in the text the scalar can only climb up as it emerges from an initial singularity. In the presence of another mild exponential, slow--roll inflation is thus injected during the ensuing descent and definite imprints are left in the CMB power spectrum: the quadrupole is systematically reduced and, depending on the choice of two parameters, an oscillatory behavior can also emerge for low multipoles l < 50, in qualitative agreement with WMAP9 and PLANCK data. The experimentally favored value of the spectral index, n_s ~ 0.96, points to a potentially important role for the NS fivebrane, which is unstable in this class of models, in the Early Universe.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | I elaborate on a link between the string--scale breaking of supersymmetry that occurs in a class of superstring models and the onset of inflation. | contribution 1.00 | 0.85 | 0.17 | asserted 0.92 |
| s1 | The link rests on spatially flat cosmologies supported by a scalar field driven by an exponential potential. | method 0.66 | 0.31 | 0.06 | asserted 1.00 |
| s2 | If, as in String Theory, this potential is steep enough, under some assumptions that are spelled out in the text the scalar can only climb up as it emerges from an initial singularity. | result 0.44 | 0.46 | 0.08 | asserted 0.59 |
| s3 | In the presence of another mild exponential, slow--roll inflation is thus injected during the ensuing descent and definite imprints are left in the CMB power spectrum: the quadrupole is systematically reduced and, depending on the choice of two parameters, an oscillatory behavior can also emerge for low multipoles l < 50, in qualitative agreement with WMAP9 and PLANCK data. | result 0.98 | 0.79 | 0.57 | asserted 0.87 |
| s4 | The experimentally favored value of the spectral index, n_s ~ 0.96, points to a potentially important role for the NS fivebrane, which is unstable in this class of models, in the Early Universe. | interpretation 0.98 | 0.53 | 0.29 | hedged possibility 0.99 |
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The paper
Original abstract
I elaborate on a link between the string--scale breaking of supersymmetry that occurs in a class of superstring models and the onset of inflation. The link rests on spatially flat cosmologies supported by a scalar field driven by an exponential potential. If, as in String Theory, this potential is steep enough, under some assumptions that are spelled out in the text the scalar can only climb up as it emerges from an initial singularity. In the presence of another mild exponential, slow--roll inflation is thus injected during the ensuing descent and definite imprints are left in the CMB power spectrum: the quadrupole is systematically reduced and, depending on the choice of two parameters, an oscillatory behavior can also emerge for low multipoles l < 50, in qualitative agreement with WMAP9 and PLANCK data. The experimentally favored value of the spectral index, n_s ~ 0.96, points to a potentially important role for the NS fivebrane, which is unstable in this class of models, in the Early Universe.
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References
How the literature uses it
22 arXiv papers cite this in 46 sentences
Papers citing it · 39 sentences without a confident label
Builds on it 1 paper
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The same mechanism of gravitinos production discussed in Section III could also be implemented in string-inspired climbing scalar pre-inflationary models [ref] .
Dark Matter and Inflation in $R+\zeta R^{2}$ Supergravity · Conclusions and discussions · 0.92
Compares with it 1 paper
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It would be interesting to compare what we find by asymptotic methods with other exact solutions [ref] .
Kasner solutions, climbing scalars and big-bang singularity · Introduction · 0.87
Cites it as support 1 paper
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Indeed, recent results in [ref] indicate that a climbing phase would lead to a dampening of the power spectrum on large scales and oscillations superimposed on it that fit relatively well the Planck 2013 data [ref] .
Kasner solutions, climbing scalars and big-bang singularity · Conclusions · 0.96
Cites it as background 4 papers
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Other work with some overlap includes Refs. [ref] .
Inflation after False Vacuum Decay: Observational Prospects after Planck · Introduction and Summary · 0.90
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The nature of the transition at $γ=1$ and the analogy with a Newtonian particle in a viscous medium were reviewed in [ref] , and more recently in [ref] .
Low-$\ell$ CMB from String-Scale SUSY Breaking? · Introduction · 0.98
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In the same period, following work on the phenomenon of climbing scalars [ref] , [ref] , [ref] , another series of papers [ref] addressed the issue of integrability of the two field[The two fields are the scale factor $a(t)$ and the inflaton $ϕ(t)$.] dynamical system encoded in the Friedman equations ([ref]) and provided a list of 28 integrable potentials $V(ϕ)$ in the sense that they provide integrabity of eq.s ([ref]).
On the Topology of the Inflaton Field in Minimal Supergravity Models · Introduction · 0.97
What it cites · 22 sentences without a confident label
Builds on 2 papers
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In [ref] we contented ourselves with the quadrupole reduction, but playing with $φ_0$ can enhance the oscillations, so that one can end up with curves like the left one of fig.
CMB Imprints of a Pre-Inflationary Climbing Phase · An observable window in the Cosmic Microwave Background ? · 0.83
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The wide scan presented in [ref] opens a number of possibilities for brane contributions to be held responsible for the value needed to account for the tilt, and an extension of the reasoning sketched in the preceding section yields a prediction for the values of $γ$ that can be induced by a generic $p$ brane coupling to the dilaton, in string frame, as $exp( - α ϕ)$.
String Solitons and T-duality · Implications for the CMB power spectrum · 0.88
Cites as background 3 papers
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I have reviewed the work of [ref] , where a link was proposed between a peculiar string–scale SUSY breaking mechanism, “brane SUSY breaking” or BSB for short, and the onset of inflation.
On Climbing Scalars in String Theory · Conclusion · 0.86
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and many explored this type of systems after Halliwell's identification of the gauge choice [ref] [ref] , until the exact solution was first presented for $γ=1$ by Dudas and Mourad in [ref] and then for all $γ$ by Russo in [ref] .
Brane solutions in strings with broken supersymmetry and dilaton tadpoles · A climbing scalar in $d$ dimensions · 0.93
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The latter include the orientifold projections [ref] that can associate open sectors to corresponding closed–string spectra, whose simplest manifestation is the link between the type–IIB theory of oriented closed strings and the $SO(32)$ type–I theory.
Open strings and their symmetry groups · Brane SUSY breaking in String Theory · 0.91
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