scholarly journals Cosmological gravity on all scales. Part II. Model independent modified gravity N-body simulations

2021 ◽  
Vol 2021 (06) ◽  
pp. 016
Author(s):  
Sankarshana Srinivasan ◽  
Daniel B. Thomas ◽  
Francesco Pace ◽  
Richard Battye
Keyword(s):  
Modified Gravity ◽  
Model Independent

scholarly journals Model-independent constraints on dark energy and modified gravity with the SKA

2015 ◽  
Author(s):  
Gongbo Zhao ◽  
D. J. Bacon ◽  
Roy Maartens ◽  
Mario Santos ◽  
Alvise Raccanelli
Keyword(s):  
Dark Energy ◽  
Modified Gravity ◽  
Model Independent

scholarly journals Astrophysical tests of screened modified gravity

2018 ◽  
Vol 27 (15) ◽  
pp. 1848008 ◽  
Author(s):  
Jeremy Sakstein
Keyword(s):  
Solar System ◽  
Modified Gravity ◽  
General Model ◽  
Thin Shell ◽  
Gravity Models ◽  
Specific Category ◽  
Model Independent ◽  
Relativistic Gravitation ◽  
Modified Gravity Models ◽  
Hubble Flow

Screened modified gravity models evade solar system tests of relativistic gravitation but exhibit novel and interesting effects on scales between the solar system and the Hubble flow: astrophysical scales. In this paper, we review how astrophysical tests using stars, galaxies, and clusters can be used to constrain these theories. We classify screening into three categories: thin-shell (chameleon, symmetron, and dilaton models), Vainshtein screening (e.g. Galileons and Horndeski), and Vainshtein breaking (e.g. beyond Horndeski and DHOST) and discuss the optimal strategy for probing each. In many cases, this is driven by whether a specific category violates the equivalence principles (strong or weak). We summarize the general model-independent bounds on each screening category that have been derived in the literature.

scholarly journals Maximum latent heat of neutron star matter without GR

2022 ◽  
Vol 258 ◽  
pp. 07007
Author(s):  
Eva Lope-Oter
Keyword(s):  
Neutron Star ◽  
Latent Heat ◽  
Modified Gravity ◽  
Current Knowledge ◽  
Neutron Star Matter ◽  
First Order ◽  
Model Independent ◽  
Dynamical Quantity ◽  
First Order Phase ◽  
Hadron Model

We show how the specific latent heat is relevant to characterize the first-order phase transitions in neutron stars. Our current knowledge of this dynamical quantity strongly depends on the uncertainty bands of Chiral Perturbation Theory and of pQCD calculations and can be used to diagnose progress on the equation of state. We state what is known to be hadron-model independent and without feedback from neutron star observations and, therefore, they can be used to test General Relativity as well as theories beyond GR, such as modified gravity.

Modeling and design of role engineering in development of access control for dynamic information systems

2013 ◽  
Vol 61 (3) ◽  
pp. 569-579 ◽  
Author(s):  
A. Poniszewska-Marańda
Keyword(s):  
Information Systems ◽  
Dynamic Information ◽  
Minimal Set ◽  
Distributed Information ◽  
Heterogeneous Information ◽  
System Protection ◽  
Level Model ◽  
Model Independent ◽  
Role Concept ◽  
High Level

Abstract Nowadays, the growth and complexity of functionalities of current information systems, especially dynamic, distributed and heterogeneous information systems, makes the design and creation of such systems a difficult task and at the same time, strategic for businesses. A very important stage of data protection in an information system is the creation of a high level model, independent of the software, satisfying the needs of system protection and security. The process of role engineering, i.e. the identification of roles and setting up in an organization is a complex task. The paper presents the modeling and design stages in the process of role engineering in the aspect of security schema development for information systems, in particular for dynamic, distributed information systems, based on the role concept and the usage concept. Such a schema is created first of all during the design phase of a system. Two actors should cooperate with each other in this creation process, the application developer and the security administrator, to determine the minimal set of user’s roles in agreement with the security constraints that guarantee the global security coherence of the system.

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