Inhomogeneous and Radiating Composite Fluids

Brassel, Byron P.; Maharaj, S. D.; Goswami, Rituparno

doi:10.3390/e23111400

Cited by 17 publications

(13 citation statements)

References 60 publications

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“…Even though the general solution is difficult to obtain, a physically realistic fluid distribution should follow the null, weak, strong and dominant energy conditions [46]- [48] simultaneously within the stellar boundary. Here, we have studied the energy conditions [49,50] for the present stellar configuration and found that they are well satisfied.…”

Section: Energy Conditionsmentioning

confidence: 79%

“…In the case of a physically viable model of a compact star, the necessary energy conditions [49], [50] must be fulfilled at all internal points as well as at the surface of compact stars. For the present model, we have checked the energy conditions within the parameter space used here and found that they are in good agreement with the prescribed conditions.…”

Section: Energy Conditionsmentioning

confidence: 99%

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Some medicinal plants with anti -fertility potential used by the tribal people of the District Cooch Behar, West Bengal, India

Bhattacharjee¹

2021

IJERR

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The increase in population is becoming a comprehensive dilemma, causing much pressure alternative medicine for anti-fertility action. Ayurveda and other Indian literature mention the use of plants in various human ailments. India has about more than 45000 plant species and among them several thousand are claimed to possess medicinal properties. Researchers conducted in the last few decades on the plants mentioned in ancient literature or used traditionally for anti-fertility action. This review reveals that some plants and their part used having anti-fertility action, which are helpful for researcher to develop new herbal anti-fertility formulations. In the recent years, interest in drugs of plant origin has been progressively increased. The Koch Rajbangshi people use various wild and cultivated plants as medicine for curing different diseases. They completely or partially depend upon these plants for curing various diseases. The plants are mostly used as first aid treatment in most of the diseases. In almost every village there is a medical man who generally knows the traditional uses of the plants. There are some ritual believes also associated with these medicinal plants or ethnomedicines. A good number of these plants are also included in their daily diet. Above all, the plants have also some market value, thus playing an important socio-economic role among the people of the various tribal people. With the use of modern day medical techniques the traditional health care system is now at the verge of extinction. In the present work, the Researcher tried to document the plants used for the medicinal purposes in the, District Cooch Behar or Koch Bihar of the North Bengal region. To create a database of traditional knowledge and use pattern of some plants with infertility potential by Koch or Rajbangshi people in the region all the plants with its uses are documented in this study.

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Section: Energy Conditionsmentioning

confidence: 79%

Section: Energy Conditionsmentioning

confidence: 99%

Some medicinal plants with anti -fertility potential used by the tribal people of the District Cooch Behar, West Bengal, India

Bhattacharjee¹

2021

IJERR

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“…The energy conditions for the Type II fluid (as shown in [21,67,69]) are -The null energy condition:…”

Section: The Generalised Radiating Boulware-deser Solutionmentioning

confidence: 99%

Charged radiation collapse in Einstein–Gauss–Bonnet gravity

2022

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We generalise the continual gravitational collapse of a spherically symmetric radiation shell of matter in five dimensional Einstein–Gauss–Bonnet gravity to include the electromagnetic field. The presence of charge has a significant effect in the collapse dynamics. We note that there exists a maximal charge contribution for which the metric functions in Einstein–Gauss–Bonnet gravity remain real, which is not the case in general relativity. Beyond this maximal charge the spacetime metric is complex. The final fate of collapse for the uncharged matter field, with positive mass, is an extended, weak and initially naked central conical singularity. With the presence of an electromagnetic field, collapse terminates with the emergence of a branch singularity separating the physical spacetime from the complex region. We show that this marked difference in singularity formation is only prevalent in five dimensions. We extend our analysis to higher dimensions and show that for all dimensions $$N\ge 5$$ N ≥ 5 , charged collapse ceases with the above mentioned branch singularity. This is significantly different than the uncharged scenario where a strong curvature singularity forms post collapse for all $$N\ge 6$$ N ≥ 6 and a weak conical singularity forms when $$N=5$$ N = 5 . A comparison with charged radiation collapse in general relativity is also given.

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“…For a charged anisotropic compact object the energy conditions namely (i) null energy condition (NEC), (ii) weak energy condition (WEC), (iii) dominant energy condition (DEC) and (iv) strong energy condition (SEC) should be satisfied [99,100]. We have determined the mathematical expressions for different energy conditions using the approach discussed in [99] and are given below ρ + pr ≥ 0, The NEC, WEC, DEC and SEC are plotted in Figs. 10, 11, 12, 13, 14 and 15 respectively.…”

Section: Energy Conditionsmentioning

confidence: 99%

Strange Quark Star (SQS) in Tolman IV potential with density dependent B-parameter and charge

et al. 2022

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In this paper, the solutions of Einstein–Maxwell Field Equations for relativistic strange quark star in Tolman-IV potential considering MIT bag model EoS $$p=\frac{1}{3}(\rho -4B)$$ p = 1 3 ( ρ - 4 B ) of interior matter in presence of charge in higher dimensions is presented, where B is bag parameter. Here we consider density dependent B as it has more practical application. We note some interesting results. It is observed that interior of a strange quark star may contain bulk stable quarks as a whole having energy per baryon $$E_B<930.4$$ E B < 930.4 MeV/fm$$^3$$ 3 or stable quark matter core enclosed by a thin metastable quark matter layer enveloped by unstable quark matter. It is also found that interior composition depends on the value of space-time dimension (D) and net charge (Q). The model presented in this paper satisfies all the necessary stability and energy conditions for a viable stellar configuration. We also note the maximum mass of stable strange quark star is 1.773 $$M_{\odot }$$ M ⊙ for density dependent B and 1.684 $$M_{\odot }$$ M ⊙ for constant B.

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Inhomogeneous and Radiating Composite Fluids

Cited by 17 publications

References 60 publications

Some medicinal plants with anti -fertility potential used by the tribal people of the District Cooch Behar, West Bengal, India

Some medicinal plants with anti -fertility potential used by the tribal people of the District Cooch Behar, West Bengal, India

Charged radiation collapse in Einstein–Gauss–Bonnet gravity

Strange Quark Star (SQS) in Tolman IV potential with density dependent B-parameter and charge

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