Towards a mathematical definition of Coulomb branches of $3$-dimensional $mathcal N=4$ gauge theories, II

Posted by dbos Tokyo

Kavli Affiliate: Hiraku Nakajima | First 5 Authors: Alexander Braverman, Michael Finkelberg, Hiraku Nakajima, , | Summary: Consider the $3$-dimensional $mathcal N=4$ supersymmetric gauge theory associated with a compact Lie group $G_c$ and its quaternionic representation $mathbf M$. Physicists study its Coulomb branch, which is a noncompact hyper-K"ahler manifold with an $mathrm{SU}(2)$-action, possibly with singularities. […]


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Probing Light Thermal Dark-Matter With a Higgs Portal Mediator

Posted by Chicago

Kavli Affiliate: Gordan Krnjaic | First 5 Authors: Gordan Krnjaic, , , , | Summary: We systematically study light (< few GeV) Dark Matter (DM) models that thermalize with visible matter through the Higgs portal and identify the remaining gaps in the viable parameter space. Such models require a comparably light scalar mediator that mixes […]


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Ultrastable frequency reference at 1.56 μm using a CO molecular overtone transition with the noise immune cavity-enhanced optical heterodyne molecular spectroscopy method

Posted by klaurent Stanford

Kavli Affiliate: Robert Byer | First 5 Authors: Shailendar Saraf, Paul Berceau, Alberto Stochino, Robert Byer, John Lipa | Summary: We report on an ultrastable molecular clock based on the interrogation of the 3{nu} rotational-vibrational combination band at 1563nm of carbon monoxide 12C16O. The laser stabilization scheme is based on frequency modulation (FM) saturation spectroscopy […]


Continue.. Ultrastable frequency reference at 1.56 μm using a CO molecular overtone transition with the noise immune cavity-enhanced optical heterodyne molecular spectroscopy method

Cascaded half-harmonic generation of femtosecond frequency combs in mid-IR

Posted by Caltech

Kavli Affiliate: Alireza Marandi | First 5 Authors: Alireza Marandi, Kirk A. Ingold, Marc Jankowski, Robert L. Byer, | Summary: For the growing demand of frequency combs in mid-infrared (mid-IR), known as the "molecular fingerprint" region of the spectrum [1], down conversion of near-IR frequency combs through half- harmonic generation offers numerous benefits including high […]


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Efficient and accurate modeling of multi-wavelength propagation in SOAs: a generalized coupled-mode approach

Posted by UCSB

Kavli Affiliate: Larry Coldren | First 5 Authors: Cristian Antonelli, Antonio Mecozzi, Wangzhe Li, Larry Coldren, | Summary: We present a model for multi-wavelength mixing in semiconductor optical amplifiers (SOAs) based on coupled-mode equations. The proposed model applies to all kinds of SOA structures, takes into account the longitudinal dependence of carrier density caused by […]


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The design and performance of a prototype water Cherenkov optical time-projection chamber

Posted by Chicago

Kavli Affiliate: Eric Oberla | First 5 Authors: E. Oberla, H. J. Frisch, , , | Summary: A first experimental test of tracking relativistic charged particles by `drifting’ Cherenkov photons in a water-based optical time-projection chamber (OTPC) has been performed at the Fermilab Test Beam Facility. The prototype OTPC detector consists of a 77~cm long, […]


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Preserving chemical signatures of primordial star formation in the first low-mass stars

Posted by Chicago

Kavli Affiliate: Alexander Ji | First 5 Authors: Alexander P. Ji, Anna Frebel, Volker Bromm, , | Summary: We model early star forming regions and their chemical enrichment by Population III (Pop III) supernovae with nucleosynthetic yields featuring high [C/Fe] ratios and pair-instability supernova (PISN) signatures. We aim to test how well these chemical abundance […]


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