NEW CONSTRAINTS ON COSMIC POLARIZATION ROTATION FROM THE ACTPol COSMIC MICROWAVE BACKGROUND B-MODE POLARIZATION OBSERVATION AND THE BICEP2 CONSTRAINT UPDATE

Mei, Hsien-Hao; Ni, Wei-Tou; Pan, Wei-Ping; Xu, Lixin; Alighieri, S. di Serego

doi:10.1088/0004-637x/805/2/107

Cited by 21 publications

(14 citation statements)

References 40 publications

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“…An anisotropic rotation, on the other hand, introduces mode-coupling that leads, in particular, to non-trivial 4-point correlations [31][32][33][34]. A detection of CPR would signal new physics beyond the standard models of cosmology and particle physics, and has become an ancillary target of the CMB polarization experiments [34][35][36][37][38][39][40][41][42][43][44][45][46]. The current upper bound on the constant rotation is ∼ 0.5 deg [43,45].…”

Section: Introductionmentioning

confidence: 99%

Future CMB constraints on cosmic birefringence and implications for fundamental physics

et al. 2019

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The primary scientific target of the ground and space based Cosmic Microwave Background (CMB) polarization experiments currently being built and proposed is the detection of primordial tensor perturbations. As a byproduct, these instruments will significantly improve constraints on cosmic birefringence, or the rotation of the CMB polarization plane. If convincingly detected, cosmic birefringence would be a dramatic manifestation of physics beyond the standard models of particle physics and cosmology. We forecast the bounds on the cosmic polarization rotation (CPR) from the upcoming ground-based Simons Observatory (SO) and the space-based LiteBIRD experiments, as well as a "fourth generation" ground-based CMB experiment like CMB-S4 and the mid-cost space mission PICO. We examine the detectability of both a stochastic anisotropic rotation field, as well as an isotropic rotation by a constant angle. CPR induces new correlations of CMB observables, including spectra of parity-odd type in the case of isotropic CPR, and mode-coupling correlations in the anisotropic rotation case. We find that LiteBIRD and SO will reduce the 1σ bound on the isotropic CPR from the current value of 30 arcmin to 1.5 and 0.6 arcmin, respectively, while a CMB-S4-like experiment and PICO will reduce it to ∼ 0.1 arcmin. The bounds on the amplitude of a scaleinvariant CPR spectrum will be reduced by one, two and three orders of magnitude by LiteBIRD, SO and CMB-S4-like/PICO, respectively. We discuss potential implications for fundamental physics by interpreting the forecasted bounds on CPR in terms of the corresponding constraints on pseudoscalar fields coupled to electromagnetism, primordial magnetic fields (PMF), and violations of Lorentz invariance. We find that CMB-S4-like and PICO can reduce the 1σ bound on the amplitude of the scale-invariant PMF from 1 nG to 0.1 nG, while also probing the magnetic field of the Milky Way. The upcoming experiments will also tighten bounds on the axion-photon coupling, with SO improving the bound from fa 50HI at present, where HI is the energy scale of inflation, to fa 500HI , and CMB-S4-like and PICO raising it to fa few×10 3 HI , placing stringent constraints on the string theory axions.

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Section: Introductionmentioning

confidence: 99%

Future CMB constraints on cosmic birefringence and implications for fundamental physics

et al. 2019

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“…Reference [12] presents constraints on anisotropies of the cosmic birefringence using the TBTB trispectrum of WMAP7 data, while Refs. [25][26][27][28][29][30] used two-point correlation. The most stringent constraints prior to this paper were published by POLARBEAR [31].…”

Section: Introductionmentioning

confidence: 99%

BICEP2 / Keck Array IX: New bounds on anisotropies of CMB polarization rotation and implications for axionlike particles and primordial magnetic fields

Ade¹,

Ahmed²,

Aikin³

et al. 2017

Phys. Rev. D

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We present the strongest constraints to date on anisotropies of cosmic microwave background (CMB) polarization rotation derived from 150 GHz data taken by the BICEP2 & Keck Array CMB experiments up to and including the 2014 observing season (BK14). The definition of the polarization angle in BK14 maps has gone through self-calibration in which the overall angle is adjusted to minimize the observed TB and EB power spectra. After this procedure, the QU maps lose sensitivity to a uniform polarization rotation but are still sensitive to anisotropies of polarization rotation. This analysis places constraints on the anisotropies of polarization rotation, which could be generated by CMB photons interacting with axionlike pseudoscalar fields or Faraday rotation induced by primordial magnetic fields. The sensitivity of BK14 maps (∼3 μK-arc min) makes it possible to reconstruct anisotropies of the polarization rotation angle and measure their angular power spectrum much more precisely than previous attempts. Our data are found to be consistent with no polarization rotation anisotropies, improving the upper bound on the amplitude of the rotation angle spectrum by roughly an order of magnitude compared to the previous best constraints. * Corresponding author. toshiyan@stanford.edu PHYSICAL REVIEW D 96, 102003 (2017) 2470-0010=2017=96(10)=102003 (7) 102003-1 © 2017 American Physical SocietyOur results lead to an order of magnitude better constraint on the coupling constant of the Chern-Simons electromagnetic term g aγ ≤ 7.2 × 10 −2 =H I (95% confidence) than the constraint derived from the B-mode spectrum, where H I is the inflationary Hubble scale. This constraint leads to a limit on the decay constant of 10 −6 ≲ f a =M pl at mass range of 10 −33 ≤ m a ≤ 10 −28 eV for r ¼ 0.01, assuming g aγ ∼ α=ð2πf a Þ with α denoting the fine structure constant. The upper bound on the amplitude of the primordial magnetic fields is 30 nG (95% confidence) from the polarization rotation anisotropies.

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“…However, these arguments appear to be more mathematical, whereas birefringence has a very intuitive meaning. Moreover, in the cosmos birefringence is excluded with high accuracy, compare the observations of Polarbear [1] and the discussion of Ni et al [118,107,119].…”

Section: Suppression Of Birefringence In Vacuum: the Light Conementioning

confidence: 92%

On Kottler's path: Origin and evolution of the premetric program in gravity and in electrodynamics

Hehl

Itin

Obukhov

2016

Int. J. Mod. Phys. D

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In 1922, Kottler put forward the program to remove the gravitational potential, the metric of spacetime, from the fundamental equations in physics as far as possible. He successfully applied this idea to Newton's gravitostatics and to Maxwell's electrodynamics, where Kottler recast the field equations in premetric form and specified a metric-dependent constitutive law. We will discuss the basics of the premetric approach and some of its beautiful consequences, like the division of universal constants into two classes. We show that classical * Based on an invited talk given at the Annual Meeting of the German Physical Society (DPG) in Berlin on 20 March 2015, "Working Group on Philosophy of Physics (AGPhil)". We sincerely thank Dennis Lehmkuhl (Wuppertal, now Pasadena) and his co-organizers Meinard Kuhlmann (Mainz) and Wolfgang Pietsch (Munich) [92] for the invitation. In the present version, we appreciably enriched our text by adding more formalism. We apologize to the philosophers for any inconvenience. A short version of this paper will be submitted to the International Journal of Modern Physics D.

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NEW CONSTRAINTS ON COSMIC POLARIZATION ROTATION FROM THE ACTPol COSMIC MICROWAVE BACKGROUND B-MODE POLARIZATION OBSERVATION AND THE BICEP2 CONSTRAINT UPDATE

Cited by 21 publications

References 40 publications

Future CMB constraints on cosmic birefringence and implications for fundamental physics

Future CMB constraints on cosmic birefringence and implications for fundamental physics

BICEP2 / Keck Array IX: New bounds on anisotropies of CMB polarization rotation and implications for axionlike particles and primordial magnetic fields

On Kottler's path: Origin and evolution of the premetric program in gravity and in electrodynamics

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