Four-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: On-sky Receiver Performance at 40, 90, 150, and 220 GHz Frequency Bands

Dahal, Sumit; Appel, John W.; Datta, Rahul; Brewer, Michael K.; Ali, Aamir; Bennett, C. L.; Bustos, R.; Chan, Manwei; Chuss, David T.; Cleary, Joseph

doi:10.3847/1538-4357/ac397c

Cited by 32 publications

(63 citation statements)

References 57 publications

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“…To this end, both on-going and future groundbased [58][59][60][61][62][63][64][65][66], balloon-borne [67,68], and spaceborne [69,70] experiments are expected to lead to a convincing discovery (or otherwise) of cosmic birefringence. If proven to be a cosmological signal, isotropic cosmic birefringence would have a profound impact on cosmology, particle physics, and quantum gravity [71][72][73][74][75][76][77][78][79][80][81].…”

Section: Discussionmentioning

confidence: 99%

Improved Constraints on Cosmic Birefringence from the WMAP and Planck Cosmic Microwave Background Polarization Data

Eskilt,

Komatsu

2022

Preprint

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The observed pattern of linear polarization of the cosmic microwave background (CMB) photons is a sensitive probe of physics violating parity symmetry under inversion of spatial coordinates. A new parity-violating interaction might have rotated the plane of linear polarization by an angle β as the CMB photons have been traveling for more than 13 billion years. This effect is known as "cosmic birefringence." In this paper, we present new measurements of cosmic birefringence from a joint analysis of polarization data from two space missions, Planck and WMAP. This dataset covers a wide range of frequencies from 23 to 353 GHz. We measure β = 0.342 • +0.094 • −0.091 • (68% C.L.) for nearly full-sky data, which excludes β = 0 at 99.987% C.L. This corresponds to the statistical significance of 3.6σ. There is no evidence for frequency dependence of β. We find a similar result, albeit with a larger uncertainty, when removing the Galactic plane from the analysis.

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Section: Discussionmentioning

confidence: 99%

Improved Constraints on Cosmic Birefringence from the WMAP and Planck Cosmic Microwave Background Polarization Data

Eskilt,

Komatsu

2022

Preprint

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“…Sensitivity of polarisation to new physics that violates parity symmetry offers exciting opportunities for discovery, which may tell us the fundamental physics behind dark matter, dark energy, and cosmic inflation. The science topics described in this article may shed new light on the way polarisation data from on-going [16][17][18][19][20][21][22]282 and future CMB experiments [23][24][25][26] are obtained, calibrated, and analysed.…”

Section: Discussionmentioning

confidence: 99%

New physics from the polarised light of the cosmic microwave background

Komatsu

2022

Preprint

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Cosmology requires new physics beyond the Standard Model of elementary particles and fields. What is the fundamental physics behind dark matter and dark energy? What generated the initial fluctuations in the early Universe? Polarised light of the cosmic microwave background (CMB) may hold the key to answers. In this article, we discuss two new developments in this research area. First, if the physics behind dark matter and dark energy violates parity symmetry, their coupling to photons rotates the plane of linear polarisation as the CMB photons travel more than 13 billion years. This effect is known as 'cosmic birefringence': space filled with dark matter and dark energy behaves as if it were a birefringent material, like a crystal. A tantalising hint for such a signal has been found with the statistical significance of 3σ . Next, the period of accelerated expansion in the very early Universe, called 'cosmic inflation', produced a stochastic background of primordial gravitational waves (GW). What generated GW? The leading idea is vacuum fluctuations in spacetime, but matter fields could also produce a significant amplitude of primordial GW. Finding its origin using CMB polarisation opens a new window into the physics behind inflation. These new scientific targets may influence how data from future CMB experiments are collected, calibrated, and analysed.

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“…In the context of inflation, a detection of primordial B modes would provide evidence for quantum fluctuations in the spacetime metric itself, would imply that inflation took place at energy scales comparable to those associated with grand unified theories, and would imply a Planckian field range, just to mention some of the consequences. Because of these far-reaching implications, several CMB experiments are currently searching for this polarization pattern [16][17][18][19][20][21] and more will begin taking data soon.…”

Section: Primordial Universementioning

confidence: 99%

Snowmass2021 Theory Frontier White Paper: Data-Driven Cosmology

Amin¹,

Cyr-Racine²,

Eifler³

et al. 2022

Preprint

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Over the past few decades, astronomical and cosmological data sets firmly established the existence of physics beyond the Standard Model of particle physics by providing strong evidence for the existence of dark matter, dark energy, and non-zero neutrino mass. In addition, the generation of primordial perturbations most likely also relies on physics beyond the Standard Model of particle physics. Theory work, ranging from models of the early universe in string theory that that led to novel phenomenological predictions to the development of effective field theories to large-scale cosmological simulations that include the physics of galaxy evolution, has played a key role in analyzing and interpreting these data sets and in suggesting novel paths forward to isolate the origins of this new physics. Over the next decade, even more sensitive surveys are beginning to take data and are being planned. In this white paper, we describe key areas of the theory program that will be needed to optimize the physics return on investment from these new observational opportunities.

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Four-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: On-sky Receiver Performance at 40, 90, 150, and 220 GHz Frequency Bands

Cited by 32 publications

References 57 publications

Improved Constraints on Cosmic Birefringence from the WMAP and Planck Cosmic Microwave Background Polarization Data

Improved Constraints on Cosmic Birefringence from the WMAP and Planck Cosmic Microwave Background Polarization Data

New physics from the polarised light of the cosmic microwave background

Snowmass2021 Theory Frontier White Paper: Data-Driven Cosmology

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