Large-scale anomalies from primordial dissipation

D’Amico, Guido; Gobbetti, Roberto; Kleban, Matthew; Schillo, Marjorie

doi:10.1088/1475-7516/2013/11/013

Cited by 27 publications

(26 citation statements)

References 35 publications

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“…(17). Right: The distribution of the amplitude of power asymmetry A from the simulated Gaussian and non-Gaussian CMB maps.…”

Section: Discussionmentioning

confidence: 99%

“…(A multiple-field model of inflation, or one that otherwise breaks the usual consistency relation, is required because superhorizon perturbations in the standard inflaton field cannot generate an asymmetry [50].) Dubbed the Erickcek-Kamionkowski-Carroll (EKC) mechanism [11], this approach has been expanded upon and refined several times since its inception [12,[14][15][16][17][18][19][20][22][23][24][25][26][27][28][29][30][31][32][33][34]. In these analyses, WMAP and Planck bounds on local-type non-Gaussianity forced the amplitude of the superhorizon perturbation to be much larger than predicted by an extrapolation of the observed primordial power spectrum to larger scales.…”

Section: Introductionmentioning

confidence: 99%

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Large-scale anomalies in the cosmic microwave background as signatures of non-Gaussianity

2016

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We derive a general expression for the probability of observing deviations from statistical isotropy in the cosmic microwave background (CMB) if the primordial fluctuations are non-Gaussian and extend to superhorizon scales. The primary motivation is to properly characterize the monopole and dipole modulations of the primordial power spectrum that are generated by the coupling between superhorizon and subhorizon perturbations. Unlike previous proposals for generating the hemispherical power asymmetry, we do not assume that the power asymmetry results from a single large superhorizon mode. Instead, we extrapolate the observed power spectrum to superhorizon scales and compute the power asymmetry that would result from a specific realization of non-Gaussian perturbations on scales larger than the observable universe. Our study encompasses many of the scenarios that have been put forward as possible explanations for the CMB hemispherical power asymmetry. We confirm our analytic predictions for the probability of a given power asymmetry by comparing them to numerical realizations of CMB maps. We find that non-local models of nonGaussianity and scale-dependent local non-Gaussianity produce scale-dependent modulations of the power spectrum, thereby potentially producing both a monopolar and a dipolar power modulation on large scales. We then provide simple examples of finding the posterior distributions for the parameters of the bispectrum from the observed monopole and dipole modulations.

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“…(17). Right: The distribution of the amplitude of power asymmetry A from the simulated Gaussian and non-Gaussian CMB maps.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large-scale anomalies in the cosmic microwave background as signatures of non-Gaussianity

2016

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“…If we integrate the last term by parts, and integrate the Gaussian field F out of the path integral, we arrive precisely at (15). On the other hand,Ã now appears manifestly as a Lagrange multiplier.…”

Section: Julia-toulouse and Generation Of Massmentioning

confidence: 99%

“…We pass to a dual form of the action by integrating out h. We can complete the square in (15), and perform the Gaussian integral, which is equivalent to solving the classical equations of motion for h, h µνλ = A µνλ + 1 m ǫ µνλρ ∂ ρ φ, and substituting the solution back into (38). In this case we arrive at the axion-4-form theory described in [4,5]:…”

Section: The Dual Axion and The Julia-toulouse Mechanismmentioning

confidence: 99%

“…The macroscopic nature of the field configurations ensures that these irrelevant operators do not spoil slow-roll inflation. The upshot is a London equation-level description of monodromy inflation, which complements the BCS-type constructions in [4,[6][7][8][9][13][14][15]. The underlying effective theory is analogous to the massive gauge theory description of the ground state of a superconductor.…”

Section: Introductionmentioning

confidence: 98%

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London equation for monodromy inflation

Kaloper

Lawrence

2017

Phys. Rev. D

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We focus on the massive gauge theory formulation of axion monodromy inflation. We argue that a gauge symmetry hidden in these models is the key mechanism protecting inflation from dangerous field theory and quantum gravity corrections. The effective theory of large field inflation is dual to a massive U(1) 4-form gauge theory, which is similar to a massive gauge theory description of superconductivity. The gauge theory explicitly realizes the old Julia-Toulouse proposal for a low energy description of a gauge theory in a defect condensate. While we work mostly with the example of quadratic axion potential induced by flux monodromy, we discuss how other types of potentials can arise from inclusion of gauge invariant corrections to the theory.

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De Sitter cosmology on an expanding bubble

Banerjee

Danielsson

Dibitetto

et al. 2019

J. High Energ. Phys.

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Constructing an explicit compactification yielding a metastable de Sitter (dS) vacuum in a UV consistent string theory is an incredibly difficult open problem. Motivated by this issue, as well as the conjecture that all non-supersymmetric AdS vacua must decay, we discuss the alternative possibility of realizing an effective four-dimensional dS cosmology on a codimensionone bubble wall separating two AdS 5 vacua. The construction further elaborates on the scenario of arXiv:1807.01570, where the aforementioned cosmology arises due to a non-perturbative decay and is embedded in a five-dimensional bulk in a time-dependent way. In this paper we discuss the relation between this scenario and the weak gravity conjecture and further develop the details of the four-dimensional cosmology. We provide a bulk interpretation for the dS temperature as the Unruh temperature experienced by an accelerated observer riding the bubble.A source of four-dimensional matter arises from a string cloud in the bulk, and we examine the consequences for the particle mass spectrum. Furthermore, we show how effective fourdimensional Einstein gravity on the bubble is obtained from the five-dimensional Gauss equation.We conclude by outlining some implications that this paradigm will have for holography, inflation, the standard model, and black holes. arXiv:1907.04268v1 [hep-th] 9 Jul 2019 The decay of AdS 2 Cosmology on a bubble 4 Bulk acceleration and induced temperature 6

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Large-scale anomalies from primordial dissipation

Cited by 27 publications

References 35 publications

Large-scale anomalies in the cosmic microwave background as signatures of non-Gaussianity

Large-scale anomalies in the cosmic microwave background as signatures of non-Gaussianity

London equation for monodromy inflation

De Sitter cosmology on an expanding bubble

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