scholarly journals Brane dynamics, the polytropic gas and conformal bulk fields

2003 ◽  
Vol 568 (1-2) ◽  
pp. 153-159 ◽  
Author(s):  
Rui Neves ◽  
Cenalo Vaz
Keyword(s):  
Polytropic Gas

scholarly journals GRAVITATIONAL INSTABILITY OF ROTATING, PRESSURE-CONFINED, POLYTROPIC GAS DISKS WITH VERTICAL STRATIFICATION

2012 ◽  
Vol 761 (2) ◽  
pp. 131 ◽  
Author(s):  
Jeong-Gyu Kim ◽  
Woong-Tae Kim ◽  
Young Min Seo ◽  
Seung Soo Hong
Keyword(s):  
Gravitational Instability ◽  
Vertical Stratification ◽  
Polytropic Gas

A critical overview of stationary solar models based on polytropic gases

2020 ◽  
Vol 17 (06) ◽  
pp. 2050084
Author(s):  
Addolorata Marasco ◽  
Antonio Romano
Keyword(s):  
Constitutive Equation ◽  
Main Sequence ◽  
Nuclear Reactions ◽  
Ideal Gas ◽  
Main Sequence Star ◽  
Hydrodynamic Equations ◽  
Stellar Core ◽  
Polytropic Gas ◽  
Critical Overview

We critically analyze the models of a main-sequence star based on polytropic gases. First, we put in evidence that the hypothesis of polytropic gas is compatible with the constitutive equation of an ideal gas if the transformations inside the star are adiabatic. Then, neither the mono- or the polyphasic models of an ideal gas can be applied inside the stellar core for the existence in this region of nuclear reactions. Moreover, we prove that polyphasic models doesn’t allow the existence of C1 solutions of the stationary hydrodynamic equations.

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