CMB-S4 Science Book, First Edition

Abazajian, Kevork N.; Adshead, Peter; Ahmed, Zeeshan; Allen, Steven W.; Alonso, David; Arnold, K.; Baccigalupi, C.; Bartlett, J. G.; Battaglia, Nicholas; Benson, B. A.; Bischoff, C. A.; Borrill, J.; Buza, V.; Calabrese, E.; Caldwell, Robert R.; Carlstrom, J. E.; Chang, C. L.; Crawford, T. M.; Cyr-Racine, Francis-Yan; Bernardis, Francesco De; Haan, T. de; Alighieri, S. di Serego; Dunkley, Joanna; Dvorkin, Cora; Errard, Josquin; Fabbian, Giulio; Feeney, Stephen; Ferraro, Simone; Filippini, J. P.; Flauger, Raphael; Fuller, George M.; Gluscevic, Vera; Green, Daniel; Grin, Daniel; Grohs, Evan; Henning, J. W.; Hill, J. Colin; Hložek, Renée; Holder, G. P.; Holzapfel, W. L.; Hu, Wayne; Huffenberger, K. M.; Keskitalo, R.; Knox, L.; Kosowsky, Arthur; Kovac, J. M.; Kovetz, Ely D.; Kuo, Chao-Lin; Kusaka, A.; Jeune, M. Le; Lee, Adrian T.; Lilley, M.; Loverde, Marilena; Madhavacheril, Mathew S.; Mantz, Adam; Marsh, David J. E.; McMahon, Jeffrey; Meerburg, P. Daniel; Meyers, Joel; Miller, Amber; Muñoz, Julián B.; Nguyễn, Hồ Nam; Niemack, Michael D.; Peloso, Marco; Peloton, J.; Pogosian, Levon; Pryke, C.; Raveri, Marco; Reichardt, Christian; Rocha, G.; Rotti, Aditya; Schaan, Emmanuel; Schmittfull, Marcel; Scott, Douglas; Sehgal, Neelima; Shandera, Sarah; Sherwin, Blake D.; Smith, Tristan L.; Sorbo, Lorenzo; Starkman, Glenn D.; Story, K. T.; Engelen, Alexander van; Vieira, J. D.; Watson, Scott; Whitehorn, N.; Wu, W. L. Kimmy

doi:10.2172/1352047

Cited by 686 publications

(999 citation statements)

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“…However, the impact of a ∆N eff ∼ O(1) deviation on the peak height can be simultaneously balanced by increasing the amount of non-relativistic matter, to the extent to which other observations providing independent constraints upon Ω c permit (for ΛCDM+N eff , a variation of ∼ 10% in Ω c h 2 is consistent with present CMB+BAO measurements [2], although these variations must be consistent with other observables). This degeneracy is not expected to be broken by CMB-S4 [27].…”

Section: Effective Number Of Neutrinosmentioning

confidence: 97%

“…One of the goals of CMB-S4 will be the detection of neutrino masses, given the present lower bound m ν 0.06 eV from oscillations. Projected bounds are as low as ∼ 0.02 eV [27], although this assumes no extra dark radiation or sterile neutrinos. A projection of the joint bound on N eff (from extra massless dark radiation) and m eff ν combining improved measurements CMB temperature measurements, lensing and BAOs indicates a limit of m eff ν 0.1 eV at 1σ [27].…”

Section: Jhep05(2017)038mentioning

confidence: 99%

“…Projected bounds are as low as ∼ 0.02 eV [27], although this assumes no extra dark radiation or sterile neutrinos. A projection of the joint bound on N eff (from extra massless dark radiation) and m eff ν combining improved measurements CMB temperature measurements, lensing and BAOs indicates a limit of m eff ν 0.1 eV at 1σ [27]. Any contribution from additional states to m eff ν may therefore be testable and bounded by the excess of the neutrino mass inference over the minimum neutrino mass, although laboratory measurements or measurements of ∆N eff will be required to further ascertain the contribution from the new particles.…”

Section: Jhep05(2017)038mentioning

confidence: 99%

“…Constraints on ∆N eff from improved measurements of the damping tail as part of CMB-S4 are projected to be ∼ 0.02-0.05 at 1σ [27]. In the following sections, we use an optimistic estimate of 0.02 for its reach in order to identify as much of the potentially testable parameter space as possible.…”

Section: Jhep05(2017)038mentioning

confidence: 99%

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Cosmological signals of a mirror twin Higgs

Craig

Koren

Trott

2017

J. High Energ. Phys.

138

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Abstract:We investigate the cosmology of the minimal model of neutral naturalness, the mirror Twin Higgs. The softly-broken mirror symmetry relating the Standard Model to its twin counterpart leads to significant dark radiation in tension with BBN and CMB observations. We quantify this tension and illustrate how it can be mitigated in several simple scenarios that alter the relative energy densities of the two sectors while respecting the softly-broken mirror symmetry. In particular, we consider both the out-of-equilibrium decay of a new scalar as well as reheating in a toy model of twinned inflation, Twinflation. In both cases the dilution of energy density in the twin sector does not merely reconcile the existence of a mirror Twin Higgs with cosmological constraints, but predicts contributions to cosmological observables that may be probed in current and future CMB experiments. This raises the prospect of discovering evidence of neutral naturalness through cosmology rather than colliders.

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Section: Effective Number Of Neutrinosmentioning

confidence: 97%

Section: Jhep05(2017)038mentioning

confidence: 99%

Section: Jhep05(2017)038mentioning

confidence: 99%

Section: Jhep05(2017)038mentioning

confidence: 99%

See 2 more Smart Citations

Cosmological signals of a mirror twin Higgs

Craig

Koren

Trott

2017

J. High Energ. Phys.

138

View full text Add to dashboard Cite

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“…Together with the mass-squared difference ∆m 2 21 , these two neutrino mass ratios can then be used to predict the mixing angle θ 23 , the CP -violating phase δ, and three neutrino masses {m 1 ,m 2 ,m 3 }, which will be soon tested in future precision data from neutrino oscillation experiments [72]. Moreover, the sum of the three absolute neutrino masses will be probed with unprecedented precision by the observations of cosmic microwave background and large-scale structures [73].…”

Section: -4mentioning

confidence: 99%

Broken S _3L × S _3R flavor symmetry and leptonic CP violation

Yang

Zhou

2017

Chinese Phys. C

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In the framework of the canonical seesaw model, we present a simple but viable scenario to explicitly break an S 3L ×S 3R flavor symmetry in the leptonic sector. It turns out that the leptonic flavor mixing matrix is completely determined by the mass ratios of the charged leptons (i.e., m e /m µ and m µ /m τ ) and those of light neutrinos (i.e., m 1 /m 2 and m 2 /m 3 ). The latest global-fit results of the three neutrino mixing angles {θ 12 ,θ 13 ,θ 23 } and two neutrino mass-squared differences {∆m 2 21 ,∆m 2 31 } at the 3σ level are used to constrain the parameter space of {m 1 /m 2 ,m 2 /m 3 }. The predictions for the mass spectrum and flavor mixing are highlighted: (1) the neutrino mass spectrum shows a hierarchical pattern and a normal ordering, e.g., m 1 ≈2.2 meV, m 2 ≈8.8 meV and m 3 ≈52.7 meV; (2) only the first octant of θ 23 is allowed, namely, 41.8 • θ 23 43.3 • ; (3) the Dirac CP -violating phase δ ≈ −22 • deviates significantly from the maximal value −90 • . All these predictions are ready to be tested in ongoing and forthcoming neutrino oscillation experiments. Moreover, we demonstrate that the cosmological matter-antimatter asymmetry can be explained via resonant leptogenesis, including the individual lepton-flavor effects. In our scenario, leptonic CP violation at low-and high-energy scales is closely connected.

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