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Search for Ultralight Dark Matter with a Frequency Adjustable Diamagnetic Levitated Sensor
Rui Li, Shaochun Lin, Liang Zhang, Changkui Duan, Pu Huang, and Jiangfeng Du
Chin. Phys. Lett.    2023, 40 (6): 069502 .   DOI: 10.1088/0256-307X/40/6/069502
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Among several dark matter candidates, bosonic ultra-light (sub-meV) dark matter is well motivated because it could couple to the Standard Model and induce new forces. Previous MICROSCOPE and Eöt–Wash torsion experiments have achieved high accuracy in the sub-1 Hz region. However, at higher frequencies there is still a lack of relevant experimental research. We propose an experimental scheme based on the diamagnetic levitated micromechanical oscillator, one of the most sensitive sensors for acceleration sensitivity below the kilohertz scale. In order to improve the measurement range, we utilize a sensor whose resonance frequency $\omega_0$ could be adjusted from 0.1 Hz to 100 Hz. The limits of the coupling constant $g_{\scriptscriptstyle B-L}$ are improved by more than 10 times compared to previous reports, and it may be possible to achieve higher accuracy by using the array of sensors in the future.
Electroweak Axion in Light of GRB221009A
Weikang Lin and Tsutomu T. Yanagida
Chin. Phys. Lett.    2023, 40 (6): 069801 .   DOI: 10.1088/0256-307X/40/6/069801
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Very high energy (VHE) photons may have a higher survival rate than that expected in standard-model physics, as suggested by the recently reported gamma ray burst GRB221009A. While a photon-axion like particle (ALP) oscillation can boost the survival rate of the VHE photons, current works have not been based on concrete particle models, leaving the identity of the corresponding ALP unclear. Here, we show that the required ALP scenario is consistent with the electroweak axion with an anomaly free $Z_{10}$ Froggatt–Nielsen symmetry.
A Search for Radio Pulsars in Supernova Remnants Using FAST with One Pulsar Discovered
Zhen Zhang, Wen-Ming Yan, Jian-Ping Yuan, Na Wang, Jun-Tao Bai, Zhi-Gang Wen, Bao-Da Li, Jin-Tao Xie, De Zhao, Yu-Bin Wang, and Nan-Nan Zhai
Chin. Phys. Lett.    2024, 41 (2): 029701 .   DOI: 10.1088/0256-307X/41/2/029701
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We report the results of a search for radio pulsars in five supernova remnants (SNRs) with the FAST telescope. The observations were made using the 19-beam receiver in “snapshot” mode. The integration time for each pointing was 10 min. We discovered a new pulsar, PSR J1845–0306, which has a spin period of 983.6 ms and a dispersion measure of 444.6 $\pm$ 2.0 cm$^{-3}$$\cdot$pc, in observations of SNR G29.6+0.1. To judge the association between the pulsar and the SNR, further verification is needed. We also re-detected some known pulsars in the data from SNRs G29.6+0.1 and G29.7–0.3. No pulsars were detected in the observations of the other three SNRs.
Exploring Sulfur Chemistry in TMC-1 with NSRT
Wasim Iqbal, Xiaohu Li, Juan Tuo, Ryszard Szczerba, Yanan Feng, Zhenzhen Miao, Jiangchao Yang, Jixing Ge, Gleb Fedoseev, Donghui Quan, Qiang Chang, Chuan-Lu Yang, Tao Yang, Gao-Lei Hou, Yong Zhang, Xuan Fang, Xia Zhang, Fangfang Li, Rong Ma, Xiaomin Song, Zhiping Kou, and Yuxuan Sun
Chin. Phys. Lett.    2024, 41 (2): 029501 .   DOI: 10.1088/0256-307X/41/2/029501
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There have been several studies on sulfur depletion in dense cores like TMC-1 (Taurus Molecular Cloud 1), employing updated reaction networks for sulfur species to explain the missing sulfur in the gas within dense clouds. Most of these studies used a C/O ratio of 0.7 or lower. We present NSRT (NanShan 26m Radio Telescope) observations of TMC-1 alongside results from time-dependent chemical simulations using an updated chemical network. Our findings highlight the impact of the C/O ratio on the gas-phase evolution of C$_2$S and C$_3$S. The simulation results show that the C/O ratio is an important parameter, playing a fundamental role in determining the gas-phase abundances of sulfur species in dense cores.
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