The First Extensive Spectroscopic Study of Young Stars in the North America and Pelican Nebulae Region

Posted by klaurent Peking

Kavli Affiliate: Gregory J. Herczeg | First 5 Authors: Min Fang, Lynne A. Hillenbrand, Jinyoung Serena Kim, Krzysztof Findeisen, Gregory J. Herczeg | Summary: We present a spectroscopic survey of over 3400 potential members in the North America and Pelican nebulae (NAP) using several low-resolution ($Rapprox$ 1300-2000) spectrographs: Palomar/Norris, WIYN/HYDRA, Keck/DEIMOS, and MMT/Hectospec. We identify […]


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Exciton-Trion-Polaritons in Two-Dimensional Materials

Posted by klaurent Cornell

Kavli Affiliate: Farhan Rana | First 5 Authors: Farhan Rana, Okan Koksal, Minwoo Jung, Gennady Shvets, A. Nick Vamivakas | Summary: We present a many-body theory for exciton-trion-polaritons in doped two-dimensional materials. Exciton-trion-polaritons are robust coherent hybrid excitations involving excitons, trions, and photons. Signatures of these polaritons have been recently seen in experiments. In these […]


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X-ray constraints on the spectral energy distribution of the $z=5.18$ blazar SDSS J013127.34-032100.1

Posted by klaurent Stanford

Kavli Affiliate: Roger W. Romani | First 5 Authors: Hongjun An, Roger W. Romani, , , | Summary: We report on X-ray measurements constraining the spectral energy distribution (SED) of the high-redshift $z=5.18$ blazar SDSS J013127.34$-$032100.1 with new XMM-Newton and NuSTAR exposures. The blazar’s X-ray spectrum is well fit by a power law with $Gamma=1.9$ […]


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Counting perverse coherent systems on Calabi-Yau 4-folds

Posted by klaurent Tokyo

Kavli Affiliate: Yukinobu Toda | First 5 Authors: Yalong Cao, Yukinobu Toda, , , | Summary: Nagao-Nakajima introduced counting invariants of stable perverse coherent systems on small resolutions of Calabi-Yau 3-folds and determined them on the resolved conifold. Their invariants recover DT/PT invariants and Szendr"oi’s non-commutative invariants in some chambers of stability conditions. In this […]


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Nucleation is More than Critical — A Case Study of the Electroweak Phase Transition in the NMSSM

Posted by Chicago

Kavli Affiliate: Carlos E. M. Wagner | First 5 Authors: Sebastian Baum, Marcela Carena, Nausheen R. Shah, Carlos E. M. Wagner, Yikun Wang | Summary: Electroweak baryogenesis is an attractive mechanism to generate the baryon asymmetry of the Universe via a strong first order electroweak phase transition. We compare the phase transition patterns suggested by […]


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Sub-Kelvin Cooling for the BICEP Array Project

Posted by klaurent Caltech

Kavli Affiliate: James Bock | First 5 Authors: Lionel Duband, Thomas Prouve, James Bock, Lorenzo Moncelsi, Alessandro Schillaci | Summary: In the field of astrophysics, the faint signal from distant galaxies and other dim cosmological sources at millimeter and submillimeter wavelengths require the use of high-sensitivity experiments. Cryogenics and the use of low-temperature detectors are […]


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Constraints on Axion-like Particles from a Hard $X$-ray Observation of Betelgeuse

Posted by klaurent MIT

Kavli Affiliate: Melania Nynka | First 5 Authors: Mengjiao Xiao, Kerstin M. Perez, Maurizio Giannotti, Oscar Straniero, Alessandro Mirizzi | Summary: We use the first observation of Betelgeuse in hard $X$-rays to perform a novel search for axion-like particles (ALPs). Betelgeuse is not expected to be a standard source of $X$-rays, but light ALPs produced […]


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