Non-minimally Coupled Tachyonic Inflation in Warped String Background

Chingangbam, Pravabati; Panda, Sudhakar; Deshamukhya, Atri

doi:10.1088/1126-6708/2005/02/052

Cited by 47 publications

(37 citation statements)

References 59 publications

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“…One reason is that the tachyon field perturbations around the unstable vacuum must contain an unstable mode whose (negative) eigenvalue is the tachyon mass squared, which is of order the string scale. This leads to an η-problem in tachyonic inflation [6,11].…”

Section: Introductionmentioning

confidence: 99%

Perturbations and moduli space dynamics of tachyon kinks

Hindmarsh

2008

Phys. Rev. D

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The dynamic process of unstable D-branes decaying into stable ones with one dimension lower can be described by a tachyon field with a Dirac-Born-Infeld effective action. In this paper we investigate the fluctuation modes of the tachyon field around a two-parameter family of static solutions representing an array of brane-antibrane pairs. Besides a pair of zero modes associated with the parameters of the solution, and instabilities associated with annihilation of the brane-antibrane pairs, we find states corresponding to excitations of the tachyon field around the brane and in the bulk. In the limit that the brane thickness tends to zero, the support of the eigenmodes is limited to the brane, consistent with the idea that propagating tachyon modes drop out of the spectrum as the tachyon field approaches its ground state. The zero modes, and other low-lying excited states, show a 4-fold degeneracy in this limit, which can be identified with some of the massless superstring modes in the brane-antibrane system. Finally, we also discuss the slow motion of the solution corresponding to the decay process in the moduli space, finding a trajectory which oscillates periodically between the unstable D-brane and the brane-antibrane pairs of one dimension lower.

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Section: Introductionmentioning

confidence: 99%

Perturbations and moduli space dynamics of tachyon kinks

Hindmarsh

2008

Phys. Rev. D

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“…[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73]. The cosmological implications of the tachyon were studied in [74][75][76][77][78][79][80][81][82][83][84][85][86]. For more details see also Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Inflationary paradigm [75][76][77][78][79][80][81][82][83][84][85][86]92], 2. Primordial non-Gaussianity and CMB aspects [96][97][98][99][100][101][102][103][104], 3.…”

Section: Introductionmentioning

confidence: 99%

COSMOS-e’-GTachyon from string theory

Choudhury

Panda

2016

Eur. Phys. J. C

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In this article, our prime objective is to study the inflationary paradigm in the context of the generalized tachyon (GTachyon) living on the world volume of a non-BPS string theory. The tachyon action is considered here is modified compared to the original action. One can quantify the amount of the modification via a power q instead of 1/2 in the effective action. Using this set-up we study inflation by various types of tachyonic potentials, using which we constrain the index q within, 1/2 < q < 2, and a specific combination (∝ α M 4 s /g s ) of the Regge slope α , the string coupling constant g s and the mass scale of tachyon M s , from the recent Planck 2015 and Planck+BICEP2/Keck Array joint data. We explicitly study the inflationary consequences from single field, assisted field and multi-field tachyon set-ups. Specifically for the single field and assisted field cases we derive the results in the quasi-de Sitter background in which we will utilize the details of cosmological perturbations and quantum fluctuations. Also we derive the expressions for all inflationary observables using any arbitrary vacuum and the Bunch-Davies vacuum. For the single field and the assisted field cases we derive the inflationary flow equations, new sets of consistency relations. Also we derive the field excursion formula for the tachyon, which shows that assisted inflation is on the safe side compared to the single field case to validate the effective field theory framework. Further we study the features of the CMB angular power spectrum from TT, TE and EE correlations from scalar fluctuations within the allowed range of q for each of the potentials from the single field set-up. We also put constraints from the temperature anisotropy and polarization spectra, which shows that our analysis is consistent with the Planck 2015 data. Finally, using the δ N formalism we derive Sayantan Choudhury: Presently working as a Visiting (Post-Doctoral) fellow at DTP, TIFR, Mumbai On lien from Harish

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“…One of the popular class of models is based on a scenario with a brane moving toward a localized antibrane, where the position of the mobile brane plays the role of the inflaton field [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In another approach, for inflation model building, the open string tachyon field described by a nonstandard action [20], which lives in a world volume of a non-BPS brane, has been used as the inflaton field [21][22][23][24][25][26][27][28]. It was observed that the same non-standard tachyon effective action also describes the dynamics of a mobile BPS brane in the background of a stack of BPS branes [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Warming up D3 brane motion in the background of D5 brane and inflation

Bhattacharjee

Deshamukhya

2014

Eur. Phys. J. C

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The position of a mobile D-3 brane moving towards a stack of localized D-5 branes has been studied as a candidate driving inflation in the warm-inflationary scenario. Here we consider the dissipation parameter as an arbitrary function of only the inflaton field. We find that the observables remain well within PLANCK predictions for a range of model parameters. We also discuss the non-gaussianity generated during inflation in this model.

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Non-minimally Coupled Tachyonic Inflation in Warped String Background

Cited by 47 publications

References 59 publications

Perturbations and moduli space dynamics of tachyon kinks

Perturbations and moduli space dynamics of tachyon kinks

COSMOS-e’-GTachyon from string theory

Warming up D3 brane motion in the background of D5 brane and inflation

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