scholarly journals Momentum dependent mean-fields of hyperons & antihyperons

2021 ◽  
Vol 252 ◽  
pp. 05006
Author(s):  
Arsenia Chorozidou ◽  
Theodoros Gaitanos
Keyword(s):  
Experimental Studies ◽  
Mean Field ◽  
Nuclear Astrophysics ◽  
Effective Field ◽  
Momentum Dependence ◽  
Chiral Effective Field Theory ◽  
Relativistic Mean Field ◽  
Optical Potentials ◽  
Nuclear Systems ◽  
Mean Fields

The in-medium properties of hyperons and antihyperons are studied with the Non-Linear Derivative (NLD) model and focus is made on the momentum dependence of strangeness optical potentials. The NLD model is based on the Relativistic Mean Field (RMF) approximation to Relativistic Hadrodynamics (RHD) approach of nuclear systems, but it incorporates an explicit momentum dependence of mean-fields. The extension of the NLD model to the baryon and antibaryon octet is based on SU(6) and G-parity arguments. It is demonstrated that with a proper choice of momentum cut-offs, the Λ and Σ optical potentials are consistent with recent studies of the chiral effective field theory(χ -EFT) and optical potentials are consistent with Lattice-QCD calculations, over a wide momentum region. We also present NLD predictions for the in-medium momentum dependence of ∧¯, ∑¯ and Ξ¯ hyperons. This work is important for future experimental studies, like CBM, PANDA at FAIR and is relevant to nuclear astrophysics as well.

scholarly journals Constraining bag constant for hybrid neutron stars

2020 ◽  
Vol 29 (07) ◽  
pp. 2050044
Author(s):  
Ishfaq A. Rather ◽  
Ankit Kumar ◽  
H. C. Das ◽  
M. Imran ◽  
A. A. Usmani ◽  
...  
Keyword(s):  
Neutron Stars ◽  
Mean Field ◽  
Effective Field ◽  
Mean Field Model ◽  
Relativistic Mean Field ◽  
Hadron Phase ◽  
Neutron Star Mass ◽  
Mit Bag Model ◽  
Quark Phase ◽  
Bag Constant

We study the star matter properties for Hybrid equation of state (EoS) by varying the bag constant. We use the effective field theory motivated relativistic mean field model (E-RMF) for hadron phase with recently reported FSUGarnet, G3 and IOPB-I parameter sets. The results of NL3 and NL3[Formula: see text] sets are also shown for comparison. The simple MIT bag model is applied for the quark phase to construct the hybrid EoS. The hybrid neutron star mass and radius are calculated by varying with [Formula: see text] to constrain the [Formula: see text] values. It is found that [Formula: see text]–160[Formula: see text]MeV is suitable for explaining the quark matter in neutron stars.

VACUUM: MATTER AND ANTIMATTER

2004 ◽  
Vol 13 (07) ◽  
pp. 1531-1538
Author(s):  
WALTER GREINER ◽  
THOMAS J. BÜRVENICH
Keyword(s):  
Field Model ◽  
Mean Field ◽  
Life Time ◽  
Mean Field Model ◽  
Relativistic Mean Field ◽  
Self Consistent ◽  
Nuclear Systems ◽  
Nuclear Environment

In this manuscript we first present the vacuum for the e+-e- field of QED and show how it is modified for baryons in nuclear environment. Then we discuss the possibility of producing new types of nuclear systems by implanting an antibaryon into ordinary nuclei. The structure of nuclei containing one antiproton or antilambda is investigated within the framework of a relativistic mean-field model. Self-consistent calculations predict an enhanced binding and considerable compression in such systems as compared with normal nuclei. We present arguments that the life time of such nuclei with respect to the antibaryon annihilation might be long enough for their observation.

scholarly journals ENERGY RELEASE ASSOCIATED WITH QUARK PHASE TRANSITION IN NEUTRON STARS: COMPARATIVE ANALYSIS OF MAXWELL AND GLENDENNING SCENARIOS

2012 ◽  
Vol 18 ◽  
pp. 1-9
Author(s):  
ANI ALAVERDYAN ◽  
GRIGOR ALAVERDYAN ◽  
SHUSHAN MELIKYAN
Keyword(s):  
Phase Transition ◽  
Mean Field ◽  
Effective Field ◽  
Compact Stars ◽  
Relativistic Mean Field ◽  
Hadron Phase ◽  
First Order Phase Transition ◽  
Deconfinement Phase Transition ◽  
The One ◽  
Quark Phase

We study the compact stars internal structure and observable characteristics alterations due to the quark deconfinement phase transition. To proceed with, we investigate the properties of isospin- asymmetric nuclear matter in the improved relativistic mean-field (RMF) theory, including a scalar-isovector δ-meson effective field. In order to describe the quark phase, we use the improved version of the MIT bag model, in which the interactions between u, d and s quarks inside the bag are taken into account in the one-gluon exchange approximation. We compute the amount of energy released by the corequake for both cases of deconfinement phase transition scenarios, corresponding to the Maxwellian type ordinary first-order phase transition and the phase transition with formation of a mixed quark-hadron phase (Glendenning scenario).

DECREASE OF THE SPIN-ORBIT INTERACTION IN DRIP-LINE NUCLEI, USING RELATIVISTIC MEAN FIELD MODELS

2006 ◽  
Vol 15 (05) ◽  
pp. 1149-1155 ◽  
Author(s):  
M. S. MEHTA ◽  
B. K. SHARMA ◽  
S. K. PATRA ◽  
RAJ K. GUPTA ◽  
W. GREINER
Keyword(s):  
Field Model ◽  
Mean Field ◽  
Neutron Number ◽  
Effective Field ◽  
Drip Line ◽  
Energy Splitting ◽  
Spin Orbit ◽  
Mean Field Model ◽  
Relativistic Mean Field ◽  
Orbit Potential

The spin-orbit potential and the energy splitting of spin-orbit partners in nuclei towards the neutron drip-line are found to show the decreasing behavior with the increase of neutron number, in both the spherical and deformed versions of the standard relativistic mean field model, the SRMF and DRMF, and its extended version for spherical case, the effective field theory motivated relativistic mean field model, the E-RMF. The calculations are presented for nuclei in different mass regions, which include the isotopes of F , Mg , Sb , Pb and Bi nuclei.

scholarly journals Relativistic mean-field approach in nuclear systems

2020 ◽  
Vol 101 (3) ◽  
Author(s):  
Xiaodong Sun ◽  
Ruirui Xu ◽  
Yuan Tian ◽  
Zhongyu Ma ◽  
Zhi Zhang ◽  
...  
Keyword(s):  
Mean Field ◽  
Field Approach ◽  
Relativistic Mean Field ◽  
Nuclear Systems

IMPACTS OF PARAMETERS ADJUSTMENT OF RELATIVISTIC MEAN FIELD MODEL ON NEUTRON STAR PROPERTIES

2011 ◽  
Vol 20 (05) ◽  
pp. 1271-1285 ◽  
Author(s):  
KASMUDIN ◽  
A. SULAKSONO
Keyword(s):  
Neutron Star ◽  
Reasonable Agreement ◽  
Field Model ◽  
Mean Field ◽  
Effective Field ◽  
Radiation Measurement ◽  
Mean Field Model ◽  
Relativistic Mean Field ◽  
The Moment ◽  
Rmf Model

Analysis of the parameters adjustment effects in isovector as well as in isoscalar sectors of effective field based relativistic mean field (E-RMF) model in the symmetric nuclear matter and neutron-rich matter properties has been performed. The impacts of the adjustment on slowly rotating neutron star are systematically investigated. It is found that the mass–radius relation obtained from adjusted parameter set G2** is compatible not only with neutron stars masses from 4U 0614+09 and 4U 1636-536, but also with the ones from thermal radiation measurement in RX J1856 and with the radius range of canonical neutron star of X7 in 47 Tuc, respectively. It is also found that the moment inertia of PSR J073-3039A and the strain amplitude of gravitational wave at the Earth's vicinity of PSR J0437-4715 as predicted by the E-RMF parameter sets used are in reasonable agreement with the extracted constraints of these observations from isospin diffusion data.

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