BICEP2 and Keck array operational overview and status of observations

Ogburn, R. W.; Ade, Peter A. R.; Aikin, R. W.; Amiri, M.; Benton, S. J.; Bischoff, C. A.; Bock, J. J.; Bonetti, J. A.; Brevik, J. A.; Bullock, E.; Burger, B.; Davis, G.; Dowell, C. D.; Duband, L.; Filippini, J. P.; Fliescher, S.; Golwala, S. R.; Gordon, Michael S.; Halpern, M.; Hasselfield, Matthew; Hilton, G. C.; Hristov, V. V.; Hui, H.; Irwin, K. D.; Kaufman, J. P.; Keating, Brian; Kernasovskiy, S. A.; Kovac, J. M.; Kuo, C. L.; Leitch, E. M.; Lueker, M.; Montroy, T. E.; Netterfield, C. B.; Nguyen, H. T.; O’Brient, R.; Orlando, A.; Pryke, C.; Reintsema, C. D.; Richter, Sonja; Ruhl, J. E.; Runyan, M. C.; Schwarz, R.; Sheehy, C. D.; Staniszewski, Z.; Sudiwala, R.; Teply, G. P.; Thompson, K. L.; Tolan, J. E.; Turner, Anthony; Vieregg, A. G.; Wiebe, Donald; Wilson, P.; Wong, C. L.

doi:10.1117/12.925731

Cited by 20 publications

(19 citation statements)

References 17 publications

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“…An all-sky cosmic variance-limited measurement to much smaller scales is feasible with current technology and several experimental designs have been proposed [330,332,333]. Although none of the former have been selected for funding to date, ground based and sub-orbital CMB polarisation measurements (which either by themselves [334] or taken in combination [335][336][337][338][339][340][341][342][343][344][345][346][347][348], promise almost full sky coverage) remain one of the most promising future avenues for the detection of features, especially on the largest scales.…”

Section: Cmb Polarisation Anisotropiesmentioning

confidence: 99%

Features and new physical scales in primordial observables: Theory and observation

Chluba

Hamann

Patil

2015

Int. J. Mod. Phys. D

212

233

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June 22, 20152 All cosmological observations to date are consistent with adiabatic, Gaussian and nearly scale invariant initial conditions. These findings provide strong evidence for a particular symmetry breaking pattern in the very early universe (with a close to vanishing order parameter, ), widely accepted as conforming to the predictions of the simplest realizations of the inflationary paradigm. However, given that our observations are only privy to perturbations, in inferring something about the background that gave rise to them, it should be clear that many different underlying constructions project onto the same set of cosmological observables. Features in the primordial correlation functions, if present, would offer a unique and discriminating window onto the parent theory in which the mechanism that generated the initial conditions is embedded. In certain contexts, simple linear response theory allows us to infer new characteristic scales from the presence of features that can break the aforementioned degeneracies among different background models, and in some cases can even offer a limited spectroscopy of the heavier degrees of freedom that couple to the inflaton. In this review, we offer a pedagogical survey of the diverse, theoretically well grounded mechanisms which can imprint features into primordial correlation functions in addition to reviewing the techniques one can employ to probe observations. These observations include cosmic microwave background anisotropies and spectral distortions as well as the matter two and three point functions as inferred from large-scale structure and potentially, 21 cm surveys.

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Section: Cmb Polarisation Anisotropiesmentioning

confidence: 99%

Features and new physical scales in primordial observables: Theory and observation

Chluba

Hamann

Patil

2015

Int. J. Mod. Phys. D

212

233

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“…While there has been dramatic progress towards the direct detection of a CGWB through the B-mode polarization in the cosmic microwave background (CMB) [6], measuring n t is challenging with current technologies [7][8][9]. However, for r 0.1 this will be feasible with the next generation of space-based [10,11], groundbased [12][13][14][15], and balloon-borne [16,17] experiments, while future 21 cm projects [18,19] could also detect lensing by a CGWB and direct detection experiments [20,21] would test the consistency condition using the lever arm between CMB and solar system scales to far greater accuracy with r O(10 −3 ).…”

mentioning

confidence: 99%

Gravitational Wave Consistency Relations for Multifield Inflation

et al. 2015

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We study the tensor spectral index nt and the tensor-to-scalar ratio r in the simplest multifield extension to single-field, slow-roll inflation models. We show that multifield models with potentials V ∼ i λi|φi| p have different predictions for nt/r than single-field models, even when all the couplings are equal λi = λj, due to the probabilistic nature of the fields' initial values. We analyze well-motivated prior probabilities for the λi and initial conditions to make detailed predictions for the marginalized probability distribution of nt/r. With O(100) fields and p > 3/4, we find that nt/r differs from the single-field result of nt/r = −1/8 at the 5σ level. This gives a novel and testable prediction for the simplest multifield inflation models.

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“…The current best limit set by the CMB polarization measurements is r < 0.73 by BICEP and a number of projects, including BICEP2, EBEX, Keck, Planck, POLARBEAR, QUIET, SPIDER, are following to revise this limit. [4][5][6][7][8][9] While the inflationary B-mode signal appears at the angular scale at ∼ 2 degrees (l ∼ 80), another important science from the B-mode polarization is to study the large scale structure of the universe. The CMB polarization signal is distorted by the weak gravitational lensing, and the E-mode power from the last scattering surface is transferred to B-mode power, and vice versa, over large range of l-space and the resultant lensing B-mode peaks at the angular scale of ∼ 10 arcmin (l ∼ 1000).…”

Section: Introductionmentioning

confidence: 99%

POLARBEAR-2 optical and polarimeter designs

et al. 2012

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POLARBEAR-2 is a ground based cosmic microwave background (CMB) radiation experiment observing from Atacama, Chile. The science goals of POLARBEAR-2 are to measure the CMB polarization signals originating from the inflationary gravity-wave background and weak gravitational lensing. In order to achieve these science goals, POLARBEAR-2 employs 7588 polarization sensitive transition edge sensor bolometers at observing frequencies of 95 and 150 GHz with 5.5 and 3.5 arcmin beam width, respectively. The telescope is the off-axis Gregorian, Huan Tran Telescope, on which the POLARBEAR-1 receiver is currently mounted. The polarimetry is based on modulation of the polarized signal using a rotating half-wave plate and the rotation of the sky. We present the developments of the optical and polarimeter designs including the cryogenically cooled refractive optics that achieve the overall 4 degrees field-of-view, the thermal filter design, the broadband anti-reflection coating, and the rotating half-wave plate.

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BICEP2 and Keck array operational overview and status of observations

Cited by 20 publications

References 17 publications

Features and new physical scales in primordial observables: Theory and observation

Features and new physical scales in primordial observables: Theory and observation

Gravitational Wave Consistency Relations for Multifield Inflation

POLARBEAR-2 optical and polarimeter designs

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