Effective field theory for neutron stars with strong Σ--hyperon repulsion

2014 ◽  
Vol 335 (6-7) ◽  
pp. 733-738 ◽  
Author(s):  
M. Razeira ◽  
A. Mesquita ◽  
C.A.Z. Vasconcellos ◽  
R. Ruffini ◽  
J.A. Rueda ◽  
...  
Keyword(s):  
Field Theory ◽  
Neutron Stars ◽  
Effective Field Theory ◽  
Effective Field

scholarly journals NATURALNESS IN AN EFFECTIVE FIELD THEORY FOR NEUTRON STAR MATTER

2004 ◽  
Vol 13 (07) ◽  
pp. 1413-1418 ◽  
Author(s):  
MOISÉS RAZEIRA ◽  
CÉSAR A. Z. VASCONCELLOS
Keyword(s):  
Field Theory ◽  
Neutron Stars ◽  
Nuclear Matter ◽  
Effective Field Theory ◽  
Mean Field ◽  
Effective Field ◽  
Hadronic Matter ◽  
Model Parameters ◽  
Static Properties ◽  
Naive Dimensional Analysis

High density hadronic matter is studied in a generalized relativistic multi-baryon Lagrangian density mean field approach which contains nonlinear couplings of the σ, ω, ϱ fields. We compare the predictions of our model with estimates obtained within a phenomenological naive dimensional analysis based on the naturalness of the coefficients of the theory. Upon adjusting the model parameters to describe bulk static properties of ordinary nuclear matter, we show that our approach represents a natural modelling of nuclear matter under the extreme conditions of density as the ones found in the interior of neutron stars. Moreover, we show that naturalness play a major role in effective field theory and, in combination with experiment, could represent a relevant criterium to select a model among others in the description of global static properties of neutron stars.

scholarly journals Chiral Effective Field Theory and the High-Density Nuclear Equation of State

2021 ◽  
Vol 71 (1) ◽  
Author(s):  
C. Drischler ◽  
J.W. Holt ◽  
C. Wellenhofer
Keyword(s):  
Field Theory ◽  
Equation Of State ◽  
Neutron Stars ◽  
Nuclear Matter ◽  
Effective Field Theory ◽  
Effective Field ◽  
High Density ◽  
Chiral Effective Field Theory ◽  
Nuclear Equation Of State ◽  
Density Regime

Born in the aftermath of core-collapse supernovae, neutron stars contain matter under extraordinary conditions of density and temperature that are difficult to reproduce in the laboratory. In recent years, neutron star observations have begun to yield novel insights into the nature of strongly interacting matter in the high-density regime where current theoretical models are challenged. At the same time, chiral effective field theory has developed into a powerful framework to study nuclear matter properties with quantified uncertainties in the moderate-density regime for modeling neutron stars. In this article, we review recent developments in chiral effective field theory and focus on many-body perturbation theory as a computationally efficient tool for calculating the properties of hot and dense nuclear matter. We also demonstrate how effective field theory enables statistically meaningful comparisons among nuclear theory predictions, nuclear experiments, and observational constraints on the nuclear equation of state. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 71 is September 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Effective field theory with genuine many-body forces and tidal effects on neutron stars

2019 ◽  
Vol 340 (1-3) ◽  
pp. 209-212
Author(s):  
M. Razeira ◽  
D. Hadjimichef ◽  
M. V. T. Machado ◽  
F. Köpp ◽  
G. Volkmer ◽  
...  
Keyword(s):  
Field Theory ◽  
Neutron Stars ◽  
Effective Field Theory ◽  
Effective Field ◽  
Many Body ◽  
Tidal Effects ◽  
Body Forces

scholarly journals Effective field theory for neutron stars with genuine many-body forces

2014 ◽  
Vol 335 (6-7) ◽  
pp. 763-768 ◽  
Author(s):  
C. A. Z. Vasconcellos ◽  
R. O. Gomes ◽  
V. Dexheimer ◽  
R. P. Negreiros ◽  
J. Horvath ◽  
...  
Keyword(s):  
Field Theory ◽  
Neutron Stars ◽  
Effective Field Theory ◽  
Effective Field ◽  
Many Body ◽  
Body Forces

An effective field theory for neutron stars with many-body forces, strong ∑-repulsion, andK-and $\bar K^0$ condensation

2015 ◽  
Vol 336 (8-9) ◽  
pp. 880-884 ◽  
Author(s):  
A. Mesquita ◽  
M. Razeira ◽  
R. Ruffini ◽  
J. A. Rueda ◽  
D. Hadjimichef ◽  
...  
Keyword(s):  
Field Theory ◽  
Neutron Stars ◽  
Effective Field Theory ◽  
Effective Field ◽  
Many Body ◽  
Body Forces ◽  
Strong Repulsion

Effective field theory for neutron stars with WIMPS in the pc-GR formalism

2017 ◽  
Vol 338 (9-10) ◽  
pp. 1073-1078 ◽  
Author(s):  
M. Razeira ◽  
D. Hadjimichef ◽  
M.V.T. Machado ◽  
F. Köpp ◽  
G.L. Volkmer ◽  
...  
Keyword(s):  
Field Theory ◽  
Neutron Stars ◽  
Effective Field Theory ◽  
Effective Field
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