778 research outputs found
Holographic Nucleons in the Nuclear Medium
We investigate the nucleon's rest mass and dispersion relation in the nuclear
medium which is holographically described by the thermal charged AdS geometry.
On this background, the chiral condensate plays an important role to determine
the nucleon's mass in both the vacuum and the nuclear medium. It also
significantly modifies the nucleon's dispersion relation. The nucleon's mass in
the high density regime increases with density as expected, while in the low
density regime it slightly decreases. We further study the splitting of the
nucleon's masses caused by the isospin interaction with the nuclear medium.Comment: 15 pages, 6 figure
Thermodynamics of Three-dimensional Black Holes via Charged Particle Absorption
We have shown that changes occur in a (2+1)-dimensional charged black hole by
adding a charged probe. The particle increases the entropy of the black hole
and guarantees the second law of thermodynamics. The first law of
thermodynamics is derived from the change in the black hole mass. Using the
particle absorption, we test the extremal black hole and find out that the mass
of the extremal black hole increases more than the electric charge. Therefore,
the outer horizon of the black hole still exists. However, the extremal
condition becomes non-extremal.Comment: 6 page
Geodesic Properties and Orbits in 5-dimensional Hypercylindrical Spacetime
We investigate the geodesic motions of a massive particle and light ray in
the hyperplane orthogonal to the symmetry axis in the 5-dimensional
hypercylindrical spacetime. The class of the solutions depends on one constant
a which is the ratio of string mass density and tension. There exist unstable
orbits in null geodesic only in some range of a. The innermost stable circular
orbits in timelike geodesic also exist only in a certain range of the parameter
a. The capture cross section and the deflection angle of light ray are also
computed.Comment: 17 pages, 10 figures, 4 tables, minor corrected and reference adde
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