Inflection point inflation and time dependent potentials in string theory

Itzhaki, Nissan; Kovetz, Ely D.

doi:10.1088/1126-6708/2007/10/054

Cited by 43 publications

(73 citation statements)

References 33 publications

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“…Negative spatial curvature resulting from tunneling entirely removes overshooting in certain classes of potential, and reduces its severity in general [661,662]. Finally, it was argued in [663] that the overshooting of an inflection point is ameliorated by particle production near points in field space where new species become light [664][665][666][667].…”

Section: Fine-tuningmentioning

confidence: 99%

Inflation and String Theory

2015

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Section: Fine-tuningmentioning

confidence: 99%

Inflation and String Theory

2015

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“…Though the parameters of the potential that we work with are different from the MSSM case, we nevertheless believe that it may be possible to realize the potential (1) in theories beyond the standard model, such as, for instance, string theory (in this context, see, for example, Refs. [59,60]). For example, it is known that the existence of a number of string axion fields can give rise to the following potential describing multi-field chaotic inflation [61]:…”

Section: The Inflaton Potential and The Background Dynamicsmentioning

confidence: 99%

Punctuated inflation and the low CMB multipoles

Jain

Chingangbam

Gong

et al. 2009

J. Cosmol. Astropart. Phys.

152

172

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Abstract. We investigate inflationary scenarios driven by a class of potentials which are similar in form to those that arise in certain minimal supersymmetric extensions of the standard model. We find that these potentials allow a brief period of departure from inflation sandwiched between two stages of slow roll inflation. We show that such a background behavior leads to a step like feature in the scalar power spectrum. We set the scales such that the drop in the power spectrum occurs at a length scale that corresponds to the Hubble radius today-a feature that seems necessary to explain the lower power observed in the quadrupole moment of the Cosmic Microwave Background (CMB) anisotropies. We perform a Markov Chain Monte Carlo analysis to determine the values of the model parameters that provide the best fit to the recent WMAP 5-year data for the CMB angular power spectrum. We find that an inflationary spectrum with a suppression of power at large scales that we obtain leads to a much better fit (with just one extra parameter, χ 2 eff improves by 6.62) of the observed data when compared to the best fit reference ΛCDM model with a featureless, power law, primordial spectrum.

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“…Given that V changes as the inflaton rolls away from the maximum, this scenario requires some tuning, and simple implementations of this idea (for example, in Higgs-like inflation, where the field begins near a local maximum of the potential) still result in values of r 0.01. Alternatively, a low value of r can be generated by inflection-point inflation (Itzhaki & Kovetz 2007), wherein the inflaton happens to occupy a point in a potential where both V and V are very small.…”

Section: A Worked Example: Power-law Potentialsmentioning

confidence: 99%

The Quest for B Modes from Inflationary Gravitational Waves

Kamionkowski

Kovetz

2016

Annu. Rev. Astron. Astrophys.

361

331

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The search for the curl component (B mode) in the cosmic microwave background (CMB) polarization induced by inflationary gravitational waves is described. The canonical single-field slow-roll model of inflation is presented, and we explain the quantum production of primordial density perturbations and gravitational waves. It is shown how these gravitational waves then give rise to polarization in the CMB. We then describe the geometric decomposition of the CMB polarization pattern into a curl-free component (E mode) and curl component (B mode) and show explicitly that gravitational waves induce B modes. We discuss the B modes induced by gravitational lensing and by Galactic foregrounds and show how both are distinguished from those induced by inflationary gravitational waves. Issues involved in the experimental pursuit of these B modes are described, and we summarize some of the strategies being pursued. We close with a brief discussion of some other avenues toward detecting/characterizing the inflationary gravitational-wave background.

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Inflection point inflation and time dependent potentials in string theory

Cited by 43 publications

References 33 publications

Inflation and String Theory

Inflation and String Theory

Punctuated inflation and the low CMB multipoles

The Quest for B Modes from Inflationary Gravitational Waves

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