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Scattering And Absorption of Light in Planetary Regoliths

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Published on: July 1, 2019

Compact stars in Eddington inspired gravity.

Paolo Pani¹, Vitor Cardoso, Térence Delsate

¹CENTRA, Departamento de Física, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais 1, 1049 Lisboa, Portugal.

Physical Review Letters

|August 16, 2011

Summary

A new gravity theory avoids cosmic singularities and supports stable, dark matter star models. Observations of relativistic stars constrain its coupling parameter, offering new insights into gravity.

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Area of Science:

* Theoretical Physics
* Astrophysics
* Cosmology

Background:

* A new Eddington-inspired theory of gravity proposed by Bañados and Ferreira.
* This theory is equivalent to general relativity in vacuum but differs within matter.
* It is a viable, one-parameter theory with potential to resolve cosmological singularities.

Purpose of the Study:

* To explore the novel features and implications of the Bañados-Ferreira gravity theory.
* To investigate the theory's behavior concerning gravitational collapse and singularity avoidance.
* To examine the existence and properties of compact stars within this theoretical framework.

Main Methods:

* Analysis of field equations for dust collapse under the new theory.
* Theoretical modeling of stable, pressureless stars composed of perfect fluid.
* Derivation of constraints on the theory's coupling parameter using relativistic star properties.

Main Results:

* For a positive coupling parameter, the theory prevents singularities during dust collapse.
* Stable, compact, pressureless stars are supported, offering dark matter models.
* Existence of relativistic stars imposes significant constraints on the coupling parameter.

Conclusions:

* The Bañados-Ferreira theory offers a singularity-free alternative to general relativity inside matter.
* It provides viable models for self-gravitating dark matter through stable compact stars.
* Observational data, such as pulsar moments of inertia, can further refine the theory's parameters.