scholarly journals Dynamics of self-interacting strings and energy-momentum conservation

2017 ◽  
Vol 383 ◽  
pp. 357-388
Author(s):  
Kurt Lechner
Keyword(s):  
Momentum Conservation ◽  
Energy Momentum Conservation

scholarly journals Thermodynamics of black holes in Rastall gravity

2018 ◽  
Vol 27 (07) ◽  
pp. 1850069 ◽  
Author(s):  
Iarley P. Lobo ◽  
H. Moradpour ◽  
J. P. Morais Graça ◽  
I. G. Salako
Keyword(s):  
Black Holes ◽  
Heat Capacity ◽  
General Relativity ◽  
Black Hole ◽  
Momentum Conservation ◽  
Thermodynamic Quantities ◽  
Horizon Radius ◽  
Thermodynamics Of Black Holes ◽  
Matter Fields ◽  
Energy Momentum Conservation

A promising theory in modifying general relativity (GR) by violating the ordinary energy–momentum conservation law in curved spacetime is the Rastall theory of gravity. In this theory, geometry and matter fields are coupled to each other in a nonminimal way. Here, we study thermodynamic properties of some black hole (BH) solutions in this framework, and compare our results with those of GR. We demonstrate how the presence of these matter sources amplifies the effects caused by the Rastall parameter in thermodynamic quantities. Our investigation also shows that BHs with radius smaller than a certain amount ([Formula: see text]) have negative heat capacity in the Rastall framework. In fact, it is a lower bound for the possible values of horizon radius satisfied by the stable BHs.

scholarly journals Energy-momentum conservation laws in Finsler/Kawaguchi Lagrangian formulation

2015 ◽  
Vol 32 (16) ◽  
pp. 165016 ◽  
Author(s):  
Takayoshi Ootsuka ◽  
Ryoko Yahagi ◽  
Muneyuki Ishida ◽  
Erico Tanaka
Keyword(s):  
Conservation Laws ◽  
Momentum Conservation ◽  
Lagrangian Formulation ◽  
Energy Momentum Conservation

THE FUZZY BAG MODEL REVISITED

2002 ◽  
Vol 17 (09) ◽  
pp. 543-553 ◽  
Author(s):  
F. PILOTTO ◽  
C. A. Z. VASCONCELLOS ◽  
H. T. COELHO
Keyword(s):  
Functional Form ◽  
Potential Model ◽  
Center Of Mass ◽  
Momentum Conservation ◽  
Radial Dependence ◽  
Bag Model ◽  
New Feature ◽  
The Masses ◽  
Relativistic Potential ◽  
Energy Momentum Conservation

In this work we develop a new version of the fuzzy bag model. The new feature is the inclusion of energy–momentum conservation. This turns the model into a "real" bag model, as opposed to a relativistic potential model. One immediate consequence is that the bag constant B will acquire a radial dependence, B = B(r), whose functional form can be completely fixed without any arbitrariness. Such a feature is of importance in the study of neutron stars, where a radial dependence of B is usually put in by hand. The parameters of the model are found by fitting the masses of the baryon octet. We include center-of-mass, one-gluon exchange and pion exchange corrections for these masses.

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