Assisted inflation via tachyon condensation

Mazumdar, Anupam; Panda, Sudhakar; Pérez‐Lorenzana, Abdel

doi:10.1016/s0550-3213(01)00410-2

Cited by 279 publications

(229 citation statements)

References 40 publications

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“…The action adopted for the tachyon field is different from that used in this paper. Another relevant pre-cursor brought to my attention by Anupam Mazumdar and to which the same remarks apply is [20]. I would like to thank them and also Andrew Chamblin, Neil Lambert, Mohammad Garousi, Thanu Padmanabhan, Nakoi Saskura and Arkady Tseytlin for helpful comments and pointng out typos and small inaccuracies in the wording.…”

Section: Acknowlegementmentioning

confidence: 76%

Cosmological evolution of the rolling tachyon

2002

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The cosmological effects of the tachyon rolling down to its ground state are discussed by coupling a simple effective field theory for the tachyon field to Einstein gravity. As the tachyon rolls down to the minimum of its potential the universe expands. Depending upon initial conditions, the scale factor may or may not start off accelerating, but ultimately it ceases to do so and the final flat spacetime is either static in the rest frame of the tachyon (if k = 0) or ( if k = −1 ) given by the Milne model.

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Section: Acknowlegementmentioning

confidence: 76%

Cosmological evolution of the rolling tachyon

2002

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“…Additionally, it makes sense to think of the antibranes as probes on the compactification manifold. On the other hand, if we are interested in signals from string theory, 6 For recent refinements of this discussion, see [74]. 7 Within slow-roll inflation it is possible to realize assisted inflation [95][96][97] with the help of multiple branes [6,21], or with multiple membranes in strongly coupled heterotic M theory [17], or with multiple axions [20], which can ameliorate the supergravity problem to some extent.…”

Section: B String Implementations Of Inflationmentioning

confidence: 99%

“…In the second equality, we have used the fact thatĝ 6 mn is Calabi-Yau (and therefore Ricci-flat). Near the bottom of the SM throat, the curvature is dominated by H 2 e ÿ2A and the derivatives of the warp factor are small in comparison.…”

Section: Problems With the Simple Picturementioning

confidence: 99%

“…With the great success of inflationary cosmology in explaining the spectrum of cosmic microwave background (CMB) fluctuations [1][2][3][4], as well as recent progress in understanding inflation in string theory -see, for example, [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]-the time is ripe to ask what signals string theory might have in cosmology. Historically speaking, there has not been much cause for optimism.…”

Section: Introduction: Seeing Strings In Cosmologymentioning

confidence: 99%

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Stringy effects during inflation and reheating

2006

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We consider inflationary cosmology in the context of string compactifications with multiple throats. In scenarios where the warping differs significantly between throats, string and Kaluza-Klein physics can generate potentially observable corrections to the cosmology of inflation and reheating. First we demonstrate that a very low string scale in the ground state compactification is incompatible with a high Hubble scale during inflation, and we propose that the compactification geometry is altered during inflation. In this configuration, the lowest scale is just above the Hubble scale, which is compatible with the effective field theory but still leads to potentially observable cosmic microwave background corrections. Also in the appropriate region of parameter space, we find that reheating leads to a phase of long open strings in the standard model sector (before the usual radiation-dominated phase). We sketch the cosmology of the long string phase and we discuss possible observational consequences.

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“…But, there is a non-standard scalar field action motivated from string theory which can be used to drive an inflationary phase, called tachyon field [7]- [9]. Because its equation of state parameter is bounded as, −1 < w < 0, it can play the role of inflaton field, well [10]- [16]. Tachyon field has some other applications in cosmology, too.…”

Section: Introductionmentioning

confidence: 99%