Isotropic cosmic birefringence from early dark energy

Murai, Kai; Naokawa, Fumihiro; Namikawa, Toshiya; Komatsu, Eiichiro

doi:10.48550/arxiv.2209.07804

Cited by 3 publications

(4 citation statements)

References 70 publications

(108 reference statements)

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“…One possibility for such a time-evolving scalar field is quintessence, a candidate for dark energy (13,111). Another is a slowly rolling scalar field associated with EDE (112,113). In either case, the rotation angle is ϕ/m Pl , where ϕ is the change in ϕ between the emission and observation of the electromagnetic wave [although, strictly speaking, this result is altered if some of the rotation occurs before recombination (113)].…”

Section: Cosmic Birefringencementioning

confidence: 99%

“…Another is a slowly rolling scalar field associated with EDE (112,113). In either case, the rotation angle is ϕ/m Pl , where ϕ is the change in ϕ between the emission and observation of the electromagnetic wave [although, strictly speaking, this result is altered if some of the rotation occurs before recombination (113)]. This cosmic birefringence (CB) leads to parity-breaking EB and TB [where T, E, and B refer to the temperature and parity-even and parity-odd polarization modes (114,115)] correlations in the CMB power spectra (116,117).…”

Section: Cosmic Birefringencementioning

confidence: 99%

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The Hubble Tension and Early Dark Energy

Kamionkowski,

Riess

2023

Annu. Rev. Nucl. Part. Sci.

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Over the past decade, the disparity between the value of the cosmic expansion rate determined directly from measurements of distance and redshift and that determined instead from the standard Lambda cold dark matter (ΛCDM) cosmological model, calibrated by measurements from the early Universe, has grown to a level of significance requiring a solution. Proposed systematic errors are not supported by the breadth of available data (and unknown errors untestable by lack of definition). Simple theoretical explanations for this Hubble tension that are consistent with the majority of the data have been surprisingly hard to come by, but in recent years, attention has focused increasingly on models that alter the early or pre-recombination physics of ΛCDM as the most feasible. Here, we describe the nature of this tension and emphasize recent developments on the observational side. We then explain why early-Universe solutions are currently favored and the constraints that any such model must satisfy. We discuss one workable example, early dark energy, and describe how it can be tested with future measurements. Given an assortment of more extended recent reviews on specific aspects of the problem, the discussion is intended to be fairly general and understandable to a broad audience. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 73 is September 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Cosmic Birefringencementioning

confidence: 99%

Section: Cosmic Birefringencementioning

confidence: 99%

The Hubble Tension and Early Dark Energy

Kamionkowski,

Riess

2023

Annu. Rev. Nucl. Part. Sci.

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“…In this paper we study the imprints of the isotropic redshift dependence of φ along the line-of-sight from last scattering surface to the observer into CMB parity even and odd power spectra. We consider either phenomenological or theoretically motivated redshift dependence of the pseudoscalar field, such as those in models of Early Dark Energy (EDE), Quintessence (DE) or axion-like dark matter (DM) [13,14,[24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Redshift evolution of cosmic birefringence in CMB anisotropies

Galaverni¹,

Finelli⋆²,

Paoletti³

2023

Preprint

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“…[26]. Analysis of evidence for parity violating effects in the Planck 2018 polarization data of the cosmic microwave background (CMB) anisotropies, revealed a non-vanishing cosmic birefringence angle at the 2.4σ level [27] and more recently a combined analysis of WMAP and Planck polarization data revealed hints of isotropic cosmic birefringence at the 3σ level [28][29][30][31]. These tantalizing hints may be a signal of cosmological axions.…”

Section: Introductionmentioning

confidence: 99%

Chern Simons condensate from misaligned axions

Cao¹,

Boyanovsky²

2023

Preprint

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We obtain the non-equilibrium condensate of the Chern Simons density induced by a misaligned homogeneous coherent axion field in linear response. The Chern-Simons dynamical susceptibility is simply related to the axion self-energy, a result that is valid to leading order in the axion coupling but to all orders in the couplings of the gauge fields to other fields within or beyond the standard model except the axion. The induced Chern-Simons density requires renormalization which is achieved by vacuum subtraction. For ultralight axions of mass m a coupled to electromagnetic fields with coupling g, the renormalized high tempera-16 π ȧ(t) with a(t) the dynamical homogeneous axion condensate. We conjecture that emergent axion-like quasiparticle excitations in condensed matter systems may be harnessed to probe cosmological axions and the Chern-Simons condensate. Furthermore, it is argued that a misaligned axion can also induce a non-abelian Chern-Simons condensate of similar qualitative form, and can also "seed" chiral symmetry breaking and induce a neutral pion condensate after the QCD phase transition.

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Isotropic cosmic birefringence from early dark energy

Cited by 3 publications

References 70 publications

The Hubble Tension and Early Dark Energy

The Hubble Tension and Early Dark Energy

Redshift evolution of cosmic birefringence in CMB anisotropies

Chern Simons condensate from misaligned axions

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