Anisotropic generalization of Buchdahl bound for specific stellar models

Sharma, Ranjan; Ghosh, Arpita; Bhattacharya, Soumik; Das, Shyam

doi:10.1140/epjc/s10052-021-09310-6

Cited by 8 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many are the works that study, and generalize this limit. Some assuming various situations[103][104][105][106][107][108], or extensions to GR[109][110][111][112][113].…”

mentioning

confidence: 99%

Horndeski fermion–boson stars

Roque¹,

Ureña–López²

2022

Class. Quantum Grav.

View full text Add to dashboard Cite

We establish the existence of static and spherically symmetric fermion-boson stars, in a low energy effective model of (beyond) Horndeski theories. These stars are in equilibrium, and are composed by a mixing of scalar and fermionic matters that only interact gravitationally one with each other. Properties such as mass, radius, and compactness are studied, highlighting the existence of two families of configurations defined by the parameter c4. These families have distinctive properties, although in certain limits both are reduced to their counterparts in General Relativity. Finally, by assuming the same conditions used in General Relativity, we find the maximum compactness of these hybrid stars and determine that it remains below the so-called Buchdahl's limit.

show abstract

“…Many are the works that study, and generalize this limit. Some assuming various situations[103][104][105][106][107][108], or extensions to GR[109][110][111][112][113].…”

mentioning

confidence: 99%

Horndeski fermion–boson stars

Roque¹,

Ureña–López²

2022

Class. Quantum Grav.

View full text Add to dashboard Cite

show abstract

“…[61,62]), we considered a massive scalar field with a time dependence and a mass range between ‡ Many are the works that study, and generalize this limit. Some assuming various situations [84,85,86,87], or extensions to GR [88,89,90,91].…”

Section: Discussionmentioning

confidence: 99%

Horndeski fermion-boson stars

Roque,

Ureña-López

2021

Preprint

View full text Add to dashboard Cite

We establish the existence of static and spherically symmetric fermionboson stars, in a low energy effective model of (beyond) Horndeski theories. This stars are in equilibrium, and are composed by a mixing of scalar and fermionic matters that only interact gravitationally one with each other. Properties such as mass, radius and compactness are studied, highlighting the existence of two families of configurations defined by the parameter c 4 . Theses families have distinctive properties, although in certain limits both are reduced to their counterparts in General Relativity. Finally, by assuming the same conditions used in General Relativity, we find the maximum compactness of these hybrid stars and determine that it remains below the so-called Buchdahl's limit.

show abstract

“…In Refs., [81][82][83] the GEB WH model was introduced as a sequence of simple Lorentzian WHs with two parameters viz., n and r 0 , where r 0 and n are the throat radius and a free even integer exponent, respectively. The shape function for this WH is provided by…”

Section: Geb Wh Generated By Dmghs In the Tsujikawa-like Modelmentioning

confidence: 99%

“…In Refs., [81–83] the GEB WH model was introduced as a sequence of simple Lorentzian WHs with two parameters viz., n and r 0 , where r 0 and n are the throat radius and a free even integer exponent, respectively. The shape function for this WH is provided by

$$\begin{equation} \epsilon (r)= r-r^{3-2n} (r^n-r_0^n)^{2-\frac{2}{n}}.

…”

Section: Geb Wh Generated By Dmghs In the Tsujikawa‐like Modelmentioning

confidence: 99%

Modeling Wormholes Generated by Dark Matter Galactic Halos in f(R)$f(R)$ Modified Gravity

et al. 2023

View full text Add to dashboard Cite

Wormholes (WHs) are hypothetical topologically non‐trivial spacetime structures that can be freely traversed by observers and connect two asymptotic regions or infinities. From the current theoretical development, the prospect of their existence is challenging but cannot be excluded. In this paper, generalized Ellis–Bronikov (GEB) traversable WH geometries for static and spherically symmetric spacetime in the background of gravity is explored. First, the Tsujikawa‐like model and the shape function for the GEB model is considered, which depend on a sequence of simple Lorentzian WHs with two parameters: a free even integer exponent, n, besides the throat radius, r0. One also consider that these WHs are generated by dark matter galactic halos (DMGHs), based on the three most common phenomenological models, viz., Navarro–Frenk–White (NFW), Thomas–Fermi (TF), and pseudo‐isothermal (PI). In this concern, the satisfaction of the energy conditions (ECs) which are dependent on the dark matter (DM) models, viz., dominant energy condition (DEC) and strong energy condition (SEC) and those which are not dependent viz., null energy condition (NEC) and WEC at the WH throat and its neighborhood is investigated. Finally, the presence of exotic matter is confirmed by the violation of the NEC in all cases, revealing the supremacy and physical acceptability to support the existence of the WHs and making them compatible and traversable in Tsujikawa's‐like model.

show abstract

Anisotropic generalization of Buchdahl bound for specific stellar models

Cited by 8 publications

References 19 publications

Horndeski fermion–boson stars

Horndeski fermion–boson stars

Horndeski fermion-boson stars

Modeling Wormholes Generated by Dark Matter Galactic Halos in f(R)$f(R)$ Modified Gravity

Contact Info

Product

Resources

About