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FERMI ACCELERATION
FERMI ACCELERATION particle
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2015/9/29
Fermi acceleration is a mechanism, first suggested by
Enrico Fermi in 1949, to explain heating of particles in cosmic
rays.
Pole-Based Approximation of the Fermi-Dirac Function
Contour integral Fermi-Dirac function Rational approximation
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2015/7/14
Two approaches for the efficient rational approximation of the Fermi-Dirac function are discussed: one uses the contour integral representation and conformal mapping, and the other is based on a versi...
Causes Of Fermi Bubble
Milky Way nuclear star center temperature
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2015/6/2
There is a mass very huge star in Milky Way Galactic disk center, known as Milky Way "Nuclear-Star". Nuclear-Star mass exceeds solar mass 9 trillion times. Nuclear-Star center temperature exceed solar...
New evidence for zero-temperature relaxation in a spin-polarized Fermi liquid
The experiment report parameters and coefficients
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2014/12/20
Spin-echo experiments are reported for 3He-4He solutions under extremely high B/T conditions, B=14.75 T and T≥1.73 mK. The 3He concentration x3 was adjusted close to the valu...
The Fermi–Hubbard model at unitarity
Simulated rare appeal screw Fermi gas the thermodynamic functions
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2014/12/20
We simulate the dilute attractive Fermi–Hubbard model in the unitarity regime using a diagrammatic determinant Monte Carlo (MC) algorithm with worm-type updates. We obtain the dependence of the critic...
Giant viscosity enhancement in a spin-polarized fermi liquid
Fermi liquid viscosity mixture high magnetic field
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2014/12/20
The viscosity is measured for a Fermi liquid, a dilute 3He-4He mixture, under extremely high magnetic field/temperature conditions (B≤14.8 T, T≥1.5 mK). The spin-splitting en...
Fermi-polaron problem: Diagrammatic Monte Carlo method for divergent sign-alternating series
Diagram to monte carlo method Fermi gas particle condensed matter
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2014/12/20
We use the diagrammatic Monte Carlo approach to solve the problem of a single spin-down fermion resonantly interacting with a Fermi gas of spin-up particles. Our solution is important for understandin...
FCI-QMC approach to the Fermi polaron
FCI-QMC the Fermi polaron Computational Physics
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2012/4/20
Finding the ground state of a fermionic Hamiltonian using quantum Monte Carlo is a very difficult problem, due to the Fermi sign problem. While still scaling exponentially, full configuration-interact...
Pseudogap phenomenon in an ultracold Fermi gas with a p-wave pairing interaction
Pseudogap phenomenon in an ultracold Fermi gas with a p-wave pairing interaction
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2012/2/27
We investigate single-particle properties of a one-component Fermi gas with a tunable p-wave interaction. Including pairing fluctuations associated with this anisotropic interaction within a $T$-matri...
Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium
Fermi-LAT Observations Diffuse Gamma-Ray Emission Implications Cosmic Rays the Interstellar Medium
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2012/2/23
The gamma-ray sky >100 MeV is dominated by the diffuse emissions from interactions of cosmic rays with the interstellar gas and radiation fields of the Milky Way. Observations of these diffuse emissio...
F-GAMMA: On the phenomenological classification of continuum radio spectra variability patterns of Fermi blazars
F-GAMMA phenomenological classification continuum radio spectra variability patterns Fermi blazars
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2012/2/21
The F-GAMMA program is a coordinated effort to investigate the physics of Active Galactic Nuclei (AGNs) via multi-frequency monitoring of Fermi blazars. In the current study we show and discuss the ev...
Do Fermi-LAT observations really imply very large Lorentz factors in GRB outflows ?
gamma-ray burst: general gamma-ray burst: individual: GRB 080916C radiative transfer radiation mechanisms: non-thermal
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2011/10/20
Recent detections of GeV photons in a few GRBs by Fermi-LAT imply huge bulk Lorentz factors to avoid a large gamma gamma optical depth at high energy. Estimates can be as high as Gamma ~ 1000 in the m...
Constraints on the Synchrotron Shock Model for the Fermi GBM Gamma-Ray Burst 090820A
Constraints Synchrotron Shock Model Fermi GBM Gamma-Ray Burst 090820A
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2011/10/18
Discerning the radiative dissipation mechanism for prompt emission in Gamma-Ray Bursts (GRBs) requires detailed spectroscopic modeling that straddles the $\nu F_{\nu}$ peak in the 100 keV - 1 MeV rang...
On the Fermi Function of Squeezed Coherent States
Fermi Function Squeezed Coherent States Quantum Physics
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2011/10/9
Abstract: Fermi observed in 1930 that the state of a quantum system may be defined in two different (but equivalent) ways, namely by its wavefunction $\Psi$ or by a certain function $g_F$ on phase spa...
Fermi gas with attractive potential and arbitrary spin in one-dimensional trap
Fermi gas attractive potential arbitrary spin one-dimensional trap
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2011/8/18
Abstract: A gas of ultracold $^6$Li atoms (effective spin 1/2) confined to an elongated trap with one-dimensional properties is a candidate to display three different phases: (i) fermions bound in Coo...