Cosmic microwave background anisotropies generated by domain wall networks

Sousa, L.; Avelino, P. P.

doi:10.1103/physrevd.92.083520

Cited by 27 publications

(25 citation statements)

References 37 publications

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“…In Ref. [249], the authors have derived a conservative constraint on the domain wall mass per unit area of σ < 3.52 × 10 −5 kg m −2 allowed by current observational data (which corresponds to a constraint on the wall-forming symmetry breaking scale of η < 0.92 MeV). Cosmic strings, on the other hand, generate a TT angular power spectrum that has a broad peak at ∼ 300, and therefore contribute dominantly to the angular power spectrum at higher multipoles (which have small observational uncertainties).…”

Section: Cmb Anisotropiesmentioning

confidence: 99%

“…The total temperature (left panel) and B-mode (right panel) angular power spectra generated by cosmic string and domain networks with the maximum tension allowed by current observational data: GσL 0 = 5.6 × 10 −6 and Gµ = 2.4 × 10 −7 for domain walls and cosmic string, respectively. The spectra were obtained using, respectively, the CMBACT code [250,251], and the extension introduced in [249]. These plots have been adapted from [249].…”

Section: Cmb Anisotropiesmentioning

confidence: 99%

“…The spectra were obtained using, respectively, the CMBACT code [250,251], and the extension introduced in [249]. These plots have been adapted from [249].…”

Section: Cmb Anisotropiesmentioning

confidence: 99%

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Unveiling the Dynamics of the Universe

et al. 2016

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Abstract:We explore the dynamics and evolution of the Universe at early and late times, focusing on both dark energy and extended gravity models and their astrophysical and cosmological consequences. Modified theories of gravity not only provide an alternative explanation for the recent expansion history of the universe, but they also offer a paradigm fundamentally distinct from the simplest dark energy models of cosmic acceleration. In this review, we perform a detailed theoretical and phenomenological analysis of different modified gravity models and investigate their consistency. We also consider the cosmological implications of well motivated physical models of the early universe with a particular emphasis on inflation and topological defects. Astrophysical and cosmological tests over a wide range of scales, from the solar system to the observable horizon, severely restrict the allowed models of the Universe. Here, we review several observational probes-including gravitational lensing, galaxy clusters, cosmic microwave background temperature and polarization, supernova and baryon acoustic oscillations measurements-and their relevance in constraining our cosmological description of the Universe.

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Section: Cmb Anisotropiesmentioning

confidence: 99%

Section: Cmb Anisotropiesmentioning

confidence: 99%

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Unveiling the Dynamics of the Universe

et al. 2016

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“…In particular, domain walls are a special case of topological defects with a planar configuration. If networks of domain walls exist, they are not necessarily responsible for dark matter [3] and they would make only a modest contribution for the dark energy as shown by [4]. However, topological defects, with their associated symmetry breaking, arise very naturally in models of new physics.…”

Section: Introduction and Overviewmentioning

confidence: 99%

Tests of Fundamental Physics From the Propagation of GNSS Signals

Bertrand

Defraigne

2019

2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC)

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This paper introduces new tests of fundamental physics by means of the analysis of disturbances on the GNSS signal propagation. We show how the GNSS signals are sensitive to a space variation of the fine structure constant α in a generic framework of effective scalar field theories beyond the Standard Model. This effective variation may originate from the crossing of the RF signals with dark matter clumps and/or solitonic structures. At the macroscopic scale, the subsequent disturbances are equivalent to those which occur during the propagation in an inhomogeneous medium. We thus propose an interpretation of the "measure" of the vacuum permeability as a test of fundamental physics. We show the relevance of our approach by a first quantification of the expected signature in a simple model of a variation of α according to a planar geometry. We use a test-bed model of domain walls for that purpose and focus on the measurable time delay in the GNSS signal carrier.

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“…For example, Zeldovic et al [10] and Kibble [11] offered an early assessment of the possibility that domain walls might have been created in the cosmos as a result of such scale transitions in the early Universe. These topological defects would have significant observational consequences, e.g., producing measurable anisotropies in the CMB temperature [12][13][14]. As cosmological observations have improved, however, it has become increasingly clear that the most likely resolution of the EHP is to avoid it in the first place.…”

Section: Introductionmentioning

confidence: 99%

A solution to the electroweak horizon problem in the $$R_\mathrm{h}=ct$$ R h = c t universe

Melia

2018

Eur. Phys. J. C

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Particle physics suggests that the Universe may have undergone several phase transitions, including the wellknown inflationary event associated with the separation of the strong and electroweak forces in grand unified theories. The accelerated cosmic expansion during this transition, at cosmic time t ∼ 10 −36 − 10 −33 s, is often viewed as an explanation for the uniformity of the CMB temperature, T , which would otherwise have required inexplicable initial conditions. With the discovery of the Higgs particle, it is now quite likely that the Universe underwent another (electroweak) phase transition, at T = 159.5±1.5 GeV -roughly ∼ 10 −11 s after the big bang. During this event, the fermions gained mass and the electric force separated from the weak force. There is currently no established explanation, however, for the apparent uniformity of the vacuum expectation value of the Higgs field which, like the uniformity in T , gives rise to its own horizon problem in standard ΛCDM cosmology. We show in this paper that a solution to the electroweak horizon problem may be found in the choice of cosmological model, and demonstrate that this issue does not exist in the alternative Friedmann-Robertson-Walker cosmology known as the R h = ct universe.

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Cosmic microwave background anisotropies generated by domain wall networks

Cited by 27 publications

References 37 publications

Unveiling the Dynamics of the Universe

Unveiling the Dynamics of the Universe

Tests of Fundamental Physics From the Propagation of GNSS Signals

A solution to the electroweak horizon problem in the $$R_\mathrm{h}=ct$$ R h = c t universe

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