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Nuclear Theory·nucl-th

Tuesday·May 16, 2017

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    Hadronic Correlation Functions in the Random Instanton-dyon Ensemble

    Rasmus Larsen🇺🇸 · Edward Shuryak🇺🇸

    It is known since 1980's that the instanton-induced 't Hooft effective Lagrangian not only can solve the so called problem, by making the meson heavy etc, but it can also lead to chiral symmetry breaking. In 1990's it was demonstrated that, taken to higher orders, this Lagrangian correctly reproduces effective forces in a large set of hadronic channels, mesonic and baryonic ones. Recent progress in understanding gauge topology at finite temperatures is related with the so called {\em instanton-dyons}, the constituents of the instantons. Some of them, called -dyons, possess the anti-periodic fermionic zero modes, and thus form a new version of the 't Hooft effective Lagrangian. This paper is our first study of a wide set of hadronic correlation function. We found that, at the lowest temperatures at which this approach is expected to be applicable, those may be well compatible with what is known about them based on phenomenological and lattice studies, provided and type dyons are strongly correlated.

    ↳ hep-phhep-latnucl-thPRD(2017)·6 citations
  2. 06

    New Prospects for Detecting High-Energy Neutrinos from Nearby Supernovae

    Kohta Murase (PSU)🇺🇸

    Neutrinos from supernovae (SNe) are crucial probes of explosive phenomena at the deaths of massive stars and neutrino physics. High-energy neutrinos are produced through hadronic processes by cosmic rays, which are accelerated during interaction between the supernova (SN) ejecta and circumstellar material (CSM). Recent observations of extragalactic SNe have revealed that a dense CSM is commonly expelled by the progenitor star. We provide new quantitative predictions of time-dependent high-energy neutrino emission from diverse types of SNe. We show that IceCube and KM3Net can detect about 1000 events from a SN II-P (and about 300000 events from a SN IIn) at a distance of 10 kpc. The new model also enables us to critically optimize the time window for dedicated searches for nearby SNe. A successful detection will give us a multienergy neutrino view of SN physics and new opportunities to study neutrino properties, as well as clues to the cosmic-ray origin. GeV-TeV neutrinos may also be seen by KM3Net, Hyper-Kamiokande, and PINGU.

    ↳ astro-ph.HEastro-ph.SRhep-phnucl-thPRD(2018)·109 citations
  3. 07

    Realizing Fulde-Ferrell Superfluids via a Dark-State Control of Feshbach Resonances

    Lianyi He · Hui Hu · Xia-Ji Liu

    We propose that the long-sought Fulde-Ferrell superfluidity with nonzero momentum pairing can be realized in ultracold two-component Fermi gases of K or Li atoms by optically tuning their magnetic Feshbach resonances via the creation of a closed-channel dark state with a Doppler-shifted Stark effect. In this scheme, two counterpropagating optical fields are applied to couple two molecular states in the closed channel to an excited molecular state, leading to a significant violation of Galilean invariance in the dark-state regime and hence to the possibility of Fulde-Ferrell superfluidity. We develop a field theoretical formulation for both two-body and many-body problems and predict that the Fulde-Ferrell state has remarkable properties, such as anisotropic single-particle dispersion relation, suppressed superfluid density at zero temperature, anisotropic sound velocity and rotonic collective mode. The latter two features can be experimentally probed using Bragg spectroscopy, providing a smoking-gun proof of Fulde-Ferrell superfluidity.

    ↳ cond-mat.quant-gascond-mat.supr-connucl-thPRL(2018)·7 citations
  4. 08

    Ultrahigh-energy Cosmic-ray Nuclei from Black Hole Jets: Recycling Galactic Cosmic Rays through Shear Acceleration

    Shigeo S. Kimura🇺🇸 · Kohta Murase🇺🇸 · B. Theodore Zhang🇨🇳

    We perform Monte Carlo simulations of transrelativistic shear acceleration dedicated to a jet-cocoon system of active galactic nuclei. A certain fraction of galactic cosmic rays in a halo is entrained, and sufficiently high-energy particles can be injected to the reacceleration process and further accelerated up to 100 EeV. We show that the shear reacceleration mechanism leads to a hard spectrum of escaping cosmic rays, , distinct from a conventional spectrum. The supersolar abundance of ultrahigh-energy nuclei is achieved due to injections at TeV-PeV energies. As a result, we find that the highest-energy spectrum and mass composition can be reasonably explained by our model without contradictions with the anisotropy data.

    ↳ astro-ph.HEastro-ph.COhep-phnucl-thPRD(2018)·81 citations

Affiliations

first authorsco-authorsvia INSPIRE