Lorentzian wormholes supported by tachyon matter

Sengupta, Rikpratik; Ghosh, Shounak; Kalam, Mehedi

doi:10.1016/j.aop.2022.168778

Cited by 7 publications

(10 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For simplicity of our analysis we take the redshift function ν 2 to be a constant which implies ν = 0. This simplification can be found in case of other wormhole constructions with exotic matter in the relativistic context [33,43].…”

Section: The Field Equationsmentioning

confidence: 79%

“…As we see from the figure, the field φ(t) has a kink-like shape. Such a shape resembles the spatial variation of a tachyon field used to construct a traversable Lorentzian wormhole [63,64], which also incidentally leads to a violation of the NEC to make the wormhole stable by avoiding Weyl curvature singularity at the throat due to infinitely large tidal forces. In this case also, although the NEC is satisfied by the physical matter source in the form of the minimally coupled scalar field, but there is a violation of the NEC by the effective matter arising from contributions due to the quantum geometric corrections.…”

Section: Lqcmentioning

confidence: 99%

“…The possibility of a wormhole existing in the outer galactic halo region has been investigated recently [25]. Wormholes have been studied in the modified gravity context [26,27,28,29,30,31,32] and also in the relativistic context with exotic matter [33,34,35,36,37,38,39,40]. However, recently a successful traversable wormhole model has been proposed in the relativistic context [41] where the wormhole is supported by a Maxwell and two Dirac fields in the absence of any exotic coupling and exotic matter and the wormhole is asymmetric about the throat, such that there is no Z 2 or mirror symmetry.…”

Section: Introductionmentioning

confidence: 99%

“…Since experimental physics seems to favour a Lorentzian signature, here we will investigate the possibility of existence of static, traversable Lorentzian wormholes in the background of an emergent universe. In our previous papers, we had successfully constructed static and traversable Lorentzian wormholes involving higher dimensional braneworld gravity [26] or by introduction an additional tachyon field as the matter source [33]. Time evolving Euclidean wormholes have been found to be present in an EU in the massive gravity context [42].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Brief Study on the Prevalence of Malaria in Kolkata, West Bengal, India

Sengupta¹,

Chatterjee²,

Ghosh³

2022

GJMR

View full text Add to dashboard Cite

Objectives: Malaria has been a major public health problem in India, with cases therein contributing significantly to the overall malaria burden within South East Asia. Majority of malaria cases in India have occurred within the eastern and central regions of the country. Over 80% of the country’s total malaria cases have been reported from 10states. Statistics for the state of West Bengal had reported approximately 26,000 and 25,000 malaria cases in 2014 and 2018, respectively, with Kolkata still being considered the most malaria-prone district of West Bengal. Methods: A cross-sectional study was designed based on data collected from the Kolkata Municipal Corporation documents on Taltala area residents during the winter. Collected data included age, sex, malaria category, medicine intake history, and others. Outcomes following medication, such as chloroquine tablets, artemisinin-based combination therapies, and primaquine, were also assessed.

show abstract

Section: The Field Equationsmentioning

confidence: 79%

Section: Lqcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Brief Study on the Prevalence of Malaria in Kolkata, West Bengal, India

Sengupta¹,

Chatterjee²,

Ghosh³

2022

GJMR

View full text Add to dashboard Cite

show abstract

“…Teleparallel and other modified theories of gravity also played a major role in exploring the solutions of traversable wormholes [40][41][42][43][44][45]. Teleparallel theory [46,47] has been proved to be one of the potential alternatives of GR.…”

Section: Introductionmentioning

confidence: 99%

Yukawa-Casimir wormholes in f(Q) gravity

Mishra¹,

Shweta²,

Sharma³

2023

Preprint

View full text Add to dashboard Cite

Casimir energy is always suggested as a possible source to create a traversable wormhole. It is also used to demonstrate the existence of negative energy, which can be created in a lab. To generalize, this idea, Yukawa modification of Casimir source has been considered in Remo Garattini (Eur. Phys. J. C 81 no.9, 824, 2021). In this work, we explore the Yukawa Casimir wormholes in symmetric teleparallel gravity. We have taken four different forms of f (Q) to obtain wormhole solutions powered by the original Casimir energy source and Yukawa modification of the Casimir energy source. In power law form f (Q) = αQ 2 + β and quadratic form f (Q) = αQ 2 + βQ + γ, where α, β, γ are constants and Q is non-metricity scalar, we analyze that wormhole throat is filled with non-exotic matter. We find self-sustained traversable wormholes in the Casimir source where null energy conditions are violated in all specific forms of f (Q), while after Yukawa modification it is observed that violation of null energy conditions is restricted to some regions in the vicinity of the throat.

show abstract

Lorentzian wormholes in an emergent universe

Sengupta

Ghosh

Paul

et al. 2023

Class. Quantum Grav.

View full text Add to dashboard Cite

A non-singular Emergent Universe (EU) scenario within the realm of standard Relativistic physics requires a generalization of the Equation of State (EoS) connecting the pressure and energy density. This generalized EoS is capable of describing a composition of exotic matter, dark energy and cosmological dust matter. Since the EU scenario is known to violate the Null Energy Condition, we investigate the possibility of presence of static, spherically symmetric and traversable Lorentzian wormholes in an EU. The obtained shape function is found to satisfy the criteria for wormhole formation, besides the violation of the NEC at the wormhole throat and ensuring traversability such that tidal forces are within desirable limits. Also, the wormhole is found to be stable through linear stability analysis. Most importantly, the numerical value of the emergent universe parameter B as estimated by our wormhole model is in agreement with and lies within the range of values as constrained by observational data in a cosmological context. Also, the negative sign of the second EU parameter A as obtained from our wormhole model is in agreement with the one required for describing an EU, which further indicates on the existence of such wormholes in an emergent universe without accounting for any additional exotic matter ﬁeld or any modiﬁcation to the gravitational sector.

show abstract

Lorentzian wormholes supported by tachyon matter

Cited by 7 publications

References 44 publications

A Brief Study on the Prevalence of Malaria in Kolkata, West Bengal, India

A Brief Study on the Prevalence of Malaria in Kolkata, West Bengal, India

Yukawa-Casimir wormholes in f(Q) gravity

Lorentzian wormholes in an emergent universe

Contact Info

Product

Resources

About