Chaotic inflation with kinetic alignment of axion fields

Bachlechner, Thomas C.; Dias, Mafalda; Frazer, Jonathan; McAllister, Liam

doi:10.1103/physrevd.91.023520

Cited by 58 publications

(82 citation statements)

References 26 publications

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“…The potential along its direction has a periodicity √ 2f . So far, we have only described again the kinetic alignment mechanism of [14] discussed in the previous section. However, we may now integrate out all degrees of freedom with mass Λ 4 /g 2 and higher, as long as we are away of ζ 1 ∼ π/ √ 2, which is where inflation ends.…”

Section: Two Is More Than Onementioning

confidence: 99%

“…The 'empirical' case-by-case realization that this requirement is not obviously realized in string theory compactifications [7] (which provide a template for a quantum gravity framework), motivated the construction of models with multiple axions and potentials from gauge instantons, in which some axion linear combination effectively hosts a transplanckian field range in its basic period, even if the original periodicities are taken sub-planckian [8,9] (see [10][11][12][13][14][15][16][17][18][19] for recent works). These models are formulated in purely phenomenological field theory terms, and therefore there remains the question of whether their features survive in actual embeddings in theories including quantum gravitational corrections.…”

Section: Jhep08(2015)032mentioning

confidence: 99%

“…• N-flation [9] • Kinetic alignment [14] • Lattice alignment [8] In N-flation models the kinetic metric is assumed to be diagonal already in the lattice basis. Then both lattice and kinetic bases are proportional to each other and related by the field redefinitionζ i = f i φ i , so the original lattice is mapped to a new rectangular lattice with side lengths 2πf i (see figure 1 (left)).…”

Section: Axion-driven Multiple Field Inflationmentioning

confidence: 99%

See 2 more Smart Citations

Transplanckian axions!?

Montero

Uranga

Valenzuela

2015

J. High Energ. Phys.

185

305

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We discuss quantum gravitational effects in Einstein theory coupled to periodic axion scalars to analyze the viability of several proposals to achieve superplanckian axion periods (aka decay constants) and their possible application to large field inflation models. The effects we study correspond to the nucleation of euclidean gravitational instantons charged under the axion, and our results are essentially compatible with (but independent of) the Weak Gravity Conjecture, as follows: single axion theories with superplanckian periods contain gravitational instantons inducing sizable higher harmonics in the axion potential, which spoil superplanckian inflaton field range. A similar result holds for multiaxion models with lattice alignment (like the Kim-Nilles-Peloso model). Finally, theories with N axions can still achieve a moderately superplanckian periodicity (by a √ N factor) with no higher harmonics in the axion potential. The Weak Gravity Conjecture fails to hold in this case due to the absence of some instantons, which are forbidden by a discrete Z N gauge symmetry. Finally we discuss the realization of these instantons as euclidean D-branes in string compactifications.

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Section: Two Is More Than Onementioning

confidence: 99%

Section: Jhep08(2015)032mentioning

confidence: 99%

Section: Axion-driven Multiple Field Inflationmentioning

confidence: 99%

See 1 more Smart Citation

Transplanckian axions!?

Montero

Uranga

Valenzuela

2015

J. High Energ. Phys.

185

305

View full text Add to dashboard Cite

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“…In view of the large B-mode reported by BICEP2 [6], this model was revisited by a number of groups [50,51,52,53,54,55,56,57]. In fact, one can consider a more general form for V 1 (φ 1 ) [58], which can lead to a large field range model with somewhat different predictions.…”

Section: Helical Inflationmentioning

confidence: 99%

Inflation, string theory and cosmic strings

Chernoff

Tye

2015

Int. J. Mod. Phys. D

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At its very beginning, the universe is believed to have grown exponentially in size via the mechanism of inflation. The almost scale-invariant density perturbation spectrum predicted by inflation is strongly supported by cosmological observations, in particular the cosmic microwave background radiation. However, the universe's precise inflationary scenario remains a profound problem for cosmology and for fundamental physics. String theory, the most-studied theory as the final physical theory of nature, should provide an answer to this question. Some of the proposals on how inflation is realized in string theory are reviewed. Since everything is made of strings, some string loops of cosmological sizes are likely to survive in the hot big bang that followed inflation. They appear as cosmic strings, which can have intricate properties. Because of the warped geometry in flux compactification of the extra spatial dimensions in string theory, some of the cosmic strings may have tensions substantially below the Planck or string scale. Such strings cluster in a manner similar to dark matter leading to hugely enhanced densities. As a result, numerous fossil remnants of the low tension cosmic strings may exist within the galaxy. They can be revealed through the optical lensing of background stars in the near future and studied in detail through gravitational wave emission. We anticipate that these cosmic strings will permit us to address central questions about the properties of string theory as well as the birth of our universe.

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“…In [13] it was investigated whether natural inflation can be realized in F-theory. Given the potential difficulties with natural inflation, one can consider multi-axion scenarios, where f < 1 can be obtained by an alignment of axions [14][15][16][17][18], or by a multitude of axions called N-flation [19][20][21][22]. (See also [23] for work on assisted inflation, and [24,25] for M-flation).…”

Section: Jhep01(2015)007mentioning

confidence: 99%

The challenge of realizing F-term axion monodromy inflation in string theory

Blumenhagen

Herschmann

Plauschinn

2015

J. High Energ. Phys.

128

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A systematic analysis of possibilities for realizing single-field F-term axion monodromy inflation via the flux-induced superpotential in type IIB string theory is performed. In this well-defined setting the conditions arising from moduli stabilization are taken into account, where we focus on the complex-structure moduli but ignore the Kähler moduli sector. Our analysis leads to a no-go theorem, if the inflaton involves the universal axion. We furthermore construct an explicit example of F-term axion monodromy inflation, in which a single axion-like field is hierarchically lighter than all remaining complexstructure moduli.

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Chaotic inflation with kinetic alignment of axion fields

Cited by 58 publications

References 26 publications

Transplanckian axions!?

Transplanckian axions!?

Inflation, string theory and cosmic strings

The challenge of realizing F-term axion monodromy inflation in string theory

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