Cosmic infrared background anisotropies as a window into primordial non-Gaussianity

Tucci, M.; Desjacques, Vincent; Kunz, M.

doi:10.1093/mnras/stw2086

Cited by 24 publications

(28 citation statements)

References 82 publications

(84 reference statements)

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“…However, dust contamination is also the main issue to overcome for the primordial B-mode analysis. Therefore many high-frequency channels are planned in future surveys, and the achievable level of foreground subtraction should make CIB-based local f NL measurements very promising, as originally pointed out in [309]. This is shown here explicitly for CORE, which, according to our forecasts, will be able to achieve f local NL < 1 sensitivity with this probe.…”

Section: Other Methodssupporting

confidence: 62%

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Exploring cosmic origins with CORE: Inflation

Finelli⋆

Bucher

Achúcarro

et al. 2018

J. Cosmol. Astropart. Phys.

142

172

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We forecast the scientific capabilities to improve our understanding of cosmic inflation of CORE, a proposed CMB space satellite submitted in response to the ESA fifth call for a medium-size mission opportunity. The CORE satellite will map the CMB anisotropies in temperature and polarization in 19 frequency channels spanning the range 60-600 GHz. CORE will have an aggregate noise sensitivity of 1.7µK• arcmin and an angular resolution of 5' at 200 GHz. We explore the impact of telescope size and noise sensitivity on the inflation science return by making forecasts for several instrumental configurations. This study assumes that the lower and higher frequency channels suffice to remove foreground contaminations and complements other related studies of component separation and systematic effects, which will be reported in other papers of the series "Exploring Cosmic Origins with CORE." We forecast the capability to determine key inflationary parameters, to lower the detection limit for the tensor-to-scalar ratio down to the 10 −3 level, to chart the landscape of single field slow-roll inflationary models, to constrain the epoch of reheating, thus connecting inflation to the standard radiation-matter dominated Big Bang era, to reconstruct the primordial power spectrum, to constrain the contribution from isocurvature perturbations to the −3 level, to improve constraints on the cosmic string tension to a level below the presumptive GUT scale, and to improve the current measurements of primordial non-Gaussianities down to the f local NL < 1 level. For all the models explored, CORE alone will improve significantly on the present constraints on the physics of inflation. Its capabilities will be further enhanced by combining with complementary future cosmological observations.

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Section: Other Methodssupporting

confidence: 62%

“…For those scenarios, a direct estimate of temperature and polarization angular bispectra (and trispectra) is the only way forward. The first method was recently considered in [309]. It is based on exploiting primordial NG signatures (i.e.…”

Section: Other Methodsmentioning

confidence: 99%

Exploring cosmic origins with CORE: Inflation

Finelli⋆

Bucher

Achúcarro

et al. 2018

J. Cosmol. Astropart. Phys.

142

172

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“…Small ∆ m * values indicate a second mild tuning (besides the one needed to avoid the η problem), which is however a common feature in the models of hilltop inflation. The predicted r values are close to the lowest detectable tensor fraction through cosmic microwave background polarization [30]; these are thus virtually impossible to be observed experimentally. Possibly detectable r values can be achieved if we ignore requirement 6 of Sec.…”

Section: Resultsmentioning

confidence: 71%

Upper bound on the tensor-to-scalar ratio in GUT-scale supersymmetric hybrid inflation

2014

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We explore the upper bound on the tensor-to-scalar ratio r in supersymmetric (F-term) hybrid inflation models with the gauge symmetry breaking scale set equal to the value 2.86 · 10 16 GeV, as dictated by the unification of the MSSM gauge couplings. We employ a unique renormalizable superpotential and a quasi-canonical Kähler potential, and the scalar spectral index ns is required to lie within the two-sigma interval from the central value found by the Planck satellite. In a sizable region of the parameter space the potential along the inflationary trajectory is a monotonically increasing function of the inflaton, and for this case, r 2.9 · 10 −4 , while the spectral index running, |dns/d ln k|, can be as large as 0.01. Ignoring higher order terms which ensure the boundedness of the potential for large values of the inflaton, the upper bound on r is significantly larger, of order 0.01, for subplanckian values of the inflaton, and |dns/d ln k| ≃ 0.006.PACs numbers: 98.80.Cq, 12.60.Jv

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“…It is thus a promising avenue to constrain the scale-dependent bias imprinted by primordial non-Gaussianity (e.g., Dalal et al 2008;de Putter & Doré 2017, and references therein). Tucci et al (2016) use Fisher forecasts to demonstrate that, even in the presence of Galactic dust residuals, an uncertainty σ( f NL ) of approximately 3.5 can be obtained for sky fractions between 0.2 and 0.6. This result would be competitive with CMB bispectrum-based measurements (Planck Collaboration 2016a) and would rely on different physical scales.…”

Section: Introductionmentioning

confidence: 99%

Large-scale Maps of the Cosmic Infrared Background from Planck

Lenz

Doré

Lagache

2019

ApJ

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The cosmic infrared background (CIB) is a powerful probe of large-scale structure across a very large redshift range, and consists of unresolved redshifted infrared emission from dusty galaxies. It can be used to study the astrophysics of galaxies, the star formation history of the universe, and the connection between dark and luminous matter. It can furthermore be used as a tracer of the large-scale structure and thus assist in de-lensing of the cosmic microwave background. The major difficulty in its use lies in obtaining accurate and unbiased large-scale CIB images that are cleaned of the contamination by Galactic dust. We used data on neutral atomic hydrogen from the recently released HI4PI Survey to create template maps of Galactic dust, allowing us to remove this component from the Planck intensity maps from 353 to 857 GHz for approximately 25% of the sky. This allows us to constrain the CIB power spectrum down to ℓ  70. We present these CIB maps and the various processing and validation steps that we have performed to ensure their quality, as well as a comparison with previous studies. All our data products are made publicly available, 4 thereby enabling the community to investigate a wide range of questions related to the universe's large-scale structure.

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Cosmic infrared background anisotropies as a window into primordial non-Gaussianity

Cited by 24 publications

References 82 publications

Exploring cosmic origins with CORE: Inflation

Exploring cosmic origins with CORE: Inflation

Upper bound on the tensor-to-scalar ratio in GUT-scale supersymmetric hybrid inflation

Large-scale Maps of the Cosmic Infrared Background from Planck

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