Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment

Ansari, Réza; Arena, Evan J.; Bandura, Kevin; Bull, Philip; Castorina, Emanuele; Chang, Tzu-Ching; Chen, Shi-Fan; Connor, Liam; Foreman, Simon; Frisch, Josef; Green, Daniel; Johnson, Matthew C.; Karagiannis, Dionysios; Liu, Adrian; Masui, Kiyoshi W.; Meerburg, P. Daniel; Münchmeyer, Moritz; Newburgh, Laura B.; Obuljen, Andrej; O'Connor, Paul; Padmanabhan, Hamsa; Shaw, J. Richard; Sheehy, Christopher; Slosar, Anže; Smith, Kendrick; Stankus, Paul; Stebbins, Albert; Timbie, Peter; Villaescusa-Navarro, Francisco; Wallisch, Benjamin; White, Martin

doi:10.48550/arxiv.1810.09572

Cited by 50 publications

(131 citation statements)

References 334 publications

(489 reference statements)

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“…The streaming velocity-induced BAO shifts are 0.13 − 0.52% in the radial BAO scale and 0.087 − 0.42% in the transverse BAO scale. These values may be compared against a precision of 0.13% per ∆z = 0.5 bin forecast for the proposed Stage II 21 cm intensity mapping experiment (Ansari et al 2018). Although our forecasts are preliminary, this suggests that streaming velocity effects will have to be taken into account in Stage II or a similar future 21 cm intensity mapping experiment.…”

Section: Bao Peak Shiftmentioning

confidence: 88%

“…where n is the galaxy number density and V is the volume. These values are given in Ansari et al (2018) for the redshifts of interests. The integration range we consider is 0.02 h Mpc −1 < k < 0.35 h Mpc −1 .…”

Section: Bao Peak Shiftmentioning

confidence: 99%

“…These include CHIME (Bandura et al 2014), HIRAX (Newburgh et al 2016), Tian-Lai (Chen 2012), FAST (Nan et al 2011), and BINGO 1 . However, larger experiments probing the higher redshifts have been proposed: the "Stage II" Packed Ultrawide-band Mapping Array (PUMA) reference concept, for example, would be an interferometer composed of 32,000 dishes and probe half the sky out to z ≈ 6 (Ansari et al 2018). This would saturate most of the BAO information available in that hemisphere, reaching a statistical uncertainty in the BAO scale of 0.13% per ∆z = 0.5 bin at 3.5 < z < 5.5.…”

Section: Introductionmentioning

confidence: 99%

“…URL: http://www.bingotelescope.org/en/ 2 This is calculated based on the effective number densities inAnsari et al (2018) and the forecasting equations inSeo & Eisenstein (2007) with no reconstruction.…”

mentioning

confidence: 99%

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Streaming Velocity Effects on the Post-reionization 21 cm Baryon Acoustic Oscillation Signal

Long,

Givans,

Hirata

2021

Preprint

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The relative velocity between baryons and dark matter in the early Universe can suppress the formation of small-scale baryonic structure and leave an imprint on the baryon acoustic oscillation (BAO) scale at low redshifts after reionization. This "streaming velocity" affects the post-reionization gas distribution by directly reducing the abundance of pre-existing minihalos ( 10 7 M ) that could be destroyed by reionization and indirectly modulating reionization history via photionization within these mini-halos. In this work, we investigate the effect of streaming velocity on the BAO feature in H I 21 cm intensity mapping after reionization, with a focus on redshifts 3.5 z 5.5. We build a spatially modulated halo model that includes the dependence of the filtering mass on the local reionization redshift and thermal history of the intergalactic gas. In our fiducial model, we find isotropic streaming velocity bias coefficients b v ranging from −0.0033 at z = 3.5 to −0.0248 at z = 5.5, which indicates that the BAO scale is stretched (i.e., the peaks shift to lower k). In particular, streaming velocity shifts the transverse BAO scale between 0.087% (z = 3.5) and 0.37% (z = 5.5) and shifts the radial BAO scale between 0.13% (z = 3.5) and 0.52% (z = 5.5). These shifts exceed the projected error bars from the more ambitious proposed hemispherical-scale surveys in H I (0.13% at 1σ per ∆z = 0.5 bin).

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Section: Bao Peak Shiftmentioning

confidence: 88%

Section: Bao Peak Shiftmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Streaming Velocity Effects on the Post-reionization 21 cm Baryon Acoustic Oscillation Signal

Long,

Givans,

Hirata

2021

Preprint

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“…A wide range of cosmological and astrophysical information can be derived from it. Previous work focused primarily on the intensity signal, showing its potential power in constraining fundamental physics [4,5], star and galaxy formation [6], and intergalactic medium [7].…”

Section: Introductionmentioning

confidence: 99%

Cross-correlation of the Polarizations of the 21-cm and Cosmic Microwave Backgrounds

Ji¹,

Hotinli²,

Kamionkowski³

2021

Preprint

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The polarization of the 21-cm radiation from the epoch of reionization arises from Thomson scattering of 21-cm photons from free electrons and provides information that complements that from the intensity fluctuation. Previous work showed that a direct detection of this signal will be difficult, and hinted that the signal might be enhanced via correlation with other tracers. Here, we discuss the cross-correlation between the cosmic microwave background (CMB) polarization and the 21-cm polarization. We treat reionization using an analytical model with parameters calibrated by seminumerical simulations. We then derive the cross-correlation angular power spectrum using the totalangular-momentum formalism. We also provide a noise analysis to test against two closely related, but subtly different, null hypotheses. First, we assume no reionization as a null hypothesis, and determine how well this null hypothesis could be ruled out by an observed 21cm-CMB polarization correlation. Second, we determine how well the null hypothesis of no 21-cm polarization can be ruled out by seeking the cross-correlation, assuming reionization is established from the CMB. We find that the first question could be answered by a synergy of ambitious next-generation 21-cm and CMB missions, whereas the second question will still remain out of reach.

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Implications of the detection of primordial gravitational waves for the Standard Model

Franciolini

Giudice

Racco

et al. 2019

J. Cosmol. Astropart. Phys.

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The detection of primordial gravitational waves would not only have extraordinary implications for our understanding of early cosmology, but would also give non-trivial constraints on Standard Model parameters, under the assumption that no new physics enters below the Higgs instability scale. We study the resulting bounds on the top quark mass and the strong coupling constant, discussing their theoretical uncertainties and their robustness against changes in other parameters.

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Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment

Cited by 50 publications

References 334 publications

Streaming Velocity Effects on the Post-reionization 21 cm Baryon Acoustic Oscillation Signal

Streaming Velocity Effects on the Post-reionization 21 cm Baryon Acoustic Oscillation Signal

Cross-correlation of the Polarizations of the 21-cm and Cosmic Microwave Backgrounds

Implications of the detection of primordial gravitational waves for the Standard Model

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