# TESTING CPT SYMMETRY WITH CURRENT AND FUTURE CMB MEASUREMENTS

## Abstract

In this paper, we use the current and future cosmic microwave background (CMB) experiments to test the Charge-Parity-Time Reversal (CPT) symmetry. We consider a CPT-violating interaction in the photon sector L{sub cs}∼p{sub μ}A{sub ν} F-tilde {sup μν}, which gives rise to a rotation of the polarization vectors of the propagating CMB photons. By combining the 9 yr WMAP, BOOMERanG 2003, and BICEP1 observations, we obtain the current constraint on the isotropic rotation angle α-bar =−2.12±1.14 (1σ), indicating that the significance of the CPT violation is about 2σ. Here, we particularly take the systematic errors of CMB measurements into account. Then, we study the effects of the anisotropies of the rotation angle [Δα( n-hat )] on the CMB polarization power spectra in detail. Due to the small effects, the current CMB polarization data cannot constrain the related parameters very well. We obtain the 95% C.L. upper limit of the variance of the anisotropies of the rotation angle C {sup α}(0) < 0.035 from all of the CMB data sets. More interestingly, including the anisotropies of rotation angle could lower the best-fit value of r and relax the tension on the constraints of r between BICEP2 and Planck. Finally, we investigate themore »

- Authors:

- Theory Division, Institute of High Energy Physics, Chinese Academy of Science, P.O. Box 918-4, Beijing 100049 (China)
- Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Science, P.O. Box 918-3, Beijing 100049 (China)
- Interdisciplinary Center for Theoretical Study, University of Science and Technology of China, Hefei, Anhui 230026 (China)

- Publication Date:

- OSTI Identifier:
- 22364297

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Astrophysical Journal; Journal Volume: 799; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; BACKGROUND RADIATION; COSMOLOGY; CPT THEOREM; LIMITING VALUES; PARITY; POLARIZATION; RELICT RADIATION; ROTATION; SYMMETRY; VECTORS

### Citation Formats

```
Li, Si-Yu, Zhang, Xinmin, Xia, Jun-Qing, Li, Hong, and Li, Mingzhe, E-mail: xiajq@ihep.ac.cn.
```*TESTING CPT SYMMETRY WITH CURRENT AND FUTURE CMB MEASUREMENTS*. United States: N. p., 2015.
Web. doi:10.1088/0004-637X/799/2/211.

```
Li, Si-Yu, Zhang, Xinmin, Xia, Jun-Qing, Li, Hong, & Li, Mingzhe, E-mail: xiajq@ihep.ac.cn.
```*TESTING CPT SYMMETRY WITH CURRENT AND FUTURE CMB MEASUREMENTS*. United States. doi:10.1088/0004-637X/799/2/211.

```
Li, Si-Yu, Zhang, Xinmin, Xia, Jun-Qing, Li, Hong, and Li, Mingzhe, E-mail: xiajq@ihep.ac.cn. Sun .
"TESTING CPT SYMMETRY WITH CURRENT AND FUTURE CMB MEASUREMENTS". United States.
doi:10.1088/0004-637X/799/2/211.
```

```
@article{osti_22364297,
```

title = {TESTING CPT SYMMETRY WITH CURRENT AND FUTURE CMB MEASUREMENTS},

author = {Li, Si-Yu and Zhang, Xinmin and Xia, Jun-Qing and Li, Hong and Li, Mingzhe, E-mail: xiajq@ihep.ac.cn},

abstractNote = {In this paper, we use the current and future cosmic microwave background (CMB) experiments to test the Charge-Parity-Time Reversal (CPT) symmetry. We consider a CPT-violating interaction in the photon sector L{sub cs}∼p{sub μ}A{sub ν} F-tilde {sup μν}, which gives rise to a rotation of the polarization vectors of the propagating CMB photons. By combining the 9 yr WMAP, BOOMERanG 2003, and BICEP1 observations, we obtain the current constraint on the isotropic rotation angle α-bar =−2.12±1.14 (1σ), indicating that the significance of the CPT violation is about 2σ. Here, we particularly take the systematic errors of CMB measurements into account. Then, we study the effects of the anisotropies of the rotation angle [Δα( n-hat )] on the CMB polarization power spectra in detail. Due to the small effects, the current CMB polarization data cannot constrain the related parameters very well. We obtain the 95% C.L. upper limit of the variance of the anisotropies of the rotation angle C {sup α}(0) < 0.035 from all of the CMB data sets. More interestingly, including the anisotropies of rotation angle could lower the best-fit value of r and relax the tension on the constraints of r between BICEP2 and Planck. Finally, we investigate the capabilities of future Planck polarization measurements on α-bar and Δα( n-hat ). Benefited from the high precision of Planck data, the constraints of the rotation angle can be significantly improved.},

doi = {10.1088/0004-637X/799/2/211},

journal = {Astrophysical Journal},

number = 2,

volume = 799,

place = {United States},

year = {Sun Feb 01 00:00:00 EST 2015},

month = {Sun Feb 01 00:00:00 EST 2015}

}