Lensing anomaly and oscillations in the primordial power spectrum

Domènech, Guillem; Kamionkowski, Marc

doi:10.1088/1475-7516/2019/11/040

Cited by 26 publications

(40 citation statements)

References 84 publications

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“…interactions in the dark matter sector, forming pressure-gravity waves that are imprinted on the clustering signal. Dark acoustic oscillations have been predicted for scenarios of DM-photon (Boehm et al 2002) and DM-neutrino interactions (Mangano et al 2006;Wilkinson et al 2014), models including dark radiation (Ackerman et al 2009;Foot & Vagnozzi 2015Dessert et al 2019; ★ E-mail: timothee.schaeffer@uzh.ch † E-mail: aurel.schneider@uzh.ch Das et al 2019), dark atom scenarios (Cyr-Racine & Sigurdson 2013), or through alternative scenarios of inflation (Domènech & Kamionkowski 2019;Ballardini et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Dark acoustic oscillations: imprints on the matter power spectrum and the halo mass function

Schaeffer

Schneider

2021

Monthly Notices of the Royal Astronomical Society

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Many non-minimal dark matter scenarios lead to oscillatory features in the matter power spectrum induced by interactions either within the dark sector or with particles from the standard model. Observing such dark acoustic oscillations would therefore be a major step towards understanding dark matter. We investigate what happens to oscillatory features during the process of nonlinear structure formation. We show that at the level of the power spectrum, oscillations are smoothed out by nonlinear mode coupling, gradually disappearing towards lower redshifts. In the halo mass function, however, the oscillatory features remain visible until the present epoch. As a consequence, dark acoustic oscillations could be detectable in observations that are either based on the halo mass function or on the high-redshift power spectrum. We investigate the effect of such features on different observables, namely, the cluster mass function, the stellar-to-halo mass relation, and the Lyman-α flux power spectrum. We find that oscillatory features remain visible in all of these observables, but they are very extended and of low amplitude, making it challenging to detect them as distinct features in the data.

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Section: Introductionmentioning

confidence: 99%

Dark acoustic oscillations: imprints on the matter power spectrum and the halo mass function

Schaeffer

Schneider

2021

Monthly Notices of the Royal Astronomical Society

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“…• The lensing anomaly [41]: Oscillatory residuals between the Planck temperature power spectra and the best-fit ΛCDM model in the multipole range l ∈ [900, 1700] in opposite phase compared to the CMB and thus phenomenologically similar to the effects of gravitational lensing. This smoothing of the acoustic peaks in the temperature power spectrum could be induced by an oscillatory feature, generated during inflation [42].…”

Section: Signals In the Cmb Datamentioning

confidence: 99%

An Overview of Nonstandard Signals in Cosmological Data

Alestas

Kraniotis

Perivolaropoulos

2021

The 1st Electronic Conference on Universe

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We discuss in a unified manner many existing signals in cosmological and astrophysical data that appear to be in some tension (2σ or larger) with the standard ΛCDM as defined by the Planck18 parameter values. The well known tensions of ΛCDM include the H 0 tension the S 8 tension and the lensing (A lens ) CMB anomaly, There is however, a wide range of other, less standard signals towards new physics. Such signals include, hints for a closed universe in the CMB, the cold spot anomaly indicating non-Gaussian fluctuations in the CMB, the hemispherical temperature variance assymetry and other CMB anomalies, cosmic dipoles challenging the cosmological principle, the Lyman-α forest Baryon Accoustic Oscillation anomaly, the cosmic birefringence in the CMB, the Lithium problem, oscillating force signals in short range gravity experiments etc. In this contribution present the current status of many such signals emphasizing their level of significance and referring to recent resources where more details can be found for each signal. We also briefly mention some possible generic theoretical approaches that can collectively explain the non-standard nature of these signals. In many cases the signals presented are controversial and there is currently debate in the literature on the possible systematic origin of some of these signals. However, for completeness we refer to all the signals we could identify in the literature citing also references that dispute their physical origin.

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“…In the following analyses, we will use the template derived in Ref. [27,58], to be shown explicitly in Sec. III, for a specific type of sharp feature in the inflation model.…”

Section: B Quantum Pscs In Non-inflationary Scenariosmentioning

confidence: 99%

Planck residuals anomaly as a fingerprint of alternative scenarios to inflation

Domènech,

Chen,

Kamionkowski

et al. 2020

Preprint

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The smoothing effect of lensing to the CMB temperature power spectrum is, to some extent, degenerate with oscillatory modulations of the primordial power spectrum, in particular if the frequency is close to that of the acoustic peaks. We consider the possibility that the lensing anomaly reported by the latest Planck 2018 results may be hinting at an oscillatory modulation generated by a massive scalar field during an alternative scenario to inflation or by a sharp feature during inflation. We use the full TTTEEE+low E CMB likelihood from Planck to derive constraints on these two types of models. We obtain that in both cases the AL anomaly is mildly reduced to less than 2σ. Moreover, we find that the oscillatory modulation generated during an alternative scenario presents the lowest value of χ 2 , with ∆χ 2 = −13 compared to ΛCDM. Furthermore, the Akaike Information Criterion suggests that such an oscillation constitutes an attractive candidate since it has a value ∆AIC = −5 with respect to ΛCDM, comparable to the AL parameter. Interestingly, the matter bounce and radiation bounce scenarios are compatible with our results. We discuss how these models of oscillatory features can be tested with future observations.

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Lensing anomaly and oscillations in the primordial power spectrum

Cited by 26 publications

References 84 publications

Dark acoustic oscillations: imprints on the matter power spectrum and the halo mass function

Dark acoustic oscillations: imprints on the matter power spectrum and the halo mass function

An Overview of Nonstandard Signals in Cosmological Data

Planck residuals anomaly as a fingerprint of alternative scenarios to inflation

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