Finite-time cosmological singularities and the possible fate of the Universe

de Haro, Jaume; Nojiri, Shin’ichi; Odintsov, S.D.; Oikonomou, V.K.; Pan, Supriya

doi:10.1016/j.physrep.2023.09.003

Cited by 49 publications

(4 citation statements)

References 902 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In any physical theory, singularities signify a shift in the way the physical reality is described, or they are striking clues of an unidentified basic theory at work [74]. Three basic kinds of singularities are possible in general relativity: first, there are black hole spacelike crushing singularities, such as in the Schwarzschild case; second, there are two cosmological spacelike singularities that appear in finite time, namely the Big Bang singularity and the Big Rip singularity [74]. In view of that we propose to work on the possibilities of finite singularities in ghost dark energy background.…”

Section: Discussionmentioning

confidence: 99%

Cosmology of Barrow holographic QCD ghost dark energy and a look into the thermodynamics

Altaibayeva,

Chattopadhyay,

Umurzakhova

2024

Phys. Scr.

View full text Add to dashboard Cite

The present study endeavours to study the cosmology of QCD ghost dark energy based on Barrow holographic ﬂuid, a particular example of Nojiri-Odintsov holographic dark energy (General Relativity and Gravitation, 2006, 38, pp.1285-1304; The European Physical Journal C, 2017, 77, pp.1-8.). The Hubble parameter is reconstructed and according the equation of state parameter is reconstructed for the Barrow holographic QCD ghost dark energy. It is observed that the eﬀective equation of state parameter has a transition from quintessence to phantom and for the current universe the equation of state parameter is very close to −1. The deceleration parameter is computed based on the reconstructed Hubble parameter and it is observed that the model can have a transition from decelerated to accelerated universe. The stateﬁnder trajectories are plotted and an interpolation between dust and ΛCDM phases is observed. Finally, the thermodynamics is studied considering apparent horizon as the enveloping horizon of the universe.

show abstract

Section: Discussionmentioning

confidence: 99%

Cosmology of Barrow holographic QCD ghost dark energy and a look into the thermodynamics

Altaibayeva,

Chattopadhyay,

Umurzakhova

2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…The above form of the scale factor has been used in various seminal works to understand the late time acceleration of the universe, and even cosmological singularities (see [95,96] for recent reviews on the same) by Odintsov, Nojiri, Barrow et al, and is fit to be used for our purposes too as it accounts for a lot of interesting cosmological epochs. Such an ansatz-based approach to holographic dark energy has recently been pursued in other works too [71][72][73]97].…”

Section: Tsallis Holographic Dark Energy and The Various Eosmentioning

confidence: 99%

Tsallis Holographic Dark Energy with Power Law Ansatz Approach

Trivedi,

Khlopov,

Timoshkin

2024

Symmetry

View full text Add to dashboard Cite

Holographic principles have proven to be a very interesting approach towards dealing with the issues of the late-time acceleration of the universe, which has resulted in a great amount of work on holographic dark energy models. We consider one such very interesting holographic scenario, namely the Tsallis Holographic dark energy model, and consider an ansatz based approach to such models. We consider three cosmological scenarios in such models, namely those with viscous, non-viscous, and Chaplygin gas scenarios, discussing various crucial aspects related to these models. We discuss various crucial properties of the Tsallis model in such scenarios and see how the phantom divide is crossed in each case, but it is only the Chaplygin gas models which provide a better view on stability issues.The symmetry property of the theory presented in the article is the assumption that space is isotropic. Using bulk viscosity instead of shear viscosity reflects spatial isotropy.

show abstract

“…The AdS/CFT correspondence gives strong indications that higher spin excitations can be significant to elaborate the quantum gravity challenges [10]. Interacting massive and massless higher spin fields in constant-curvature spaces provide another possible insight into the origin of Dark Matter and Dark Energy [11,12] beyond the models with vector massive fields [13] and sterile neutrinos [14] to be by reasonable candidates for Dark Matter, see for reviews [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Covariant Cubic Interacting Vertices for Massless and Massive Integer Higher Spin Fields

Buchbinder,

Reshetnyak

2023

Symmetry

View full text Add to dashboard Cite

We develop the BRST approach to construct the general off-shell local Lorentz covariant cubic interaction vertices for irreducible massless and massive higher spin fields on d-dimensional Minkowski space. We consider two different cases for interacting higher spin fields: with one massive and two massless; two massive, both with coinciding and with different masses and one massless field of spins s1,s2,s3. Unlike the previous results on cubic vertices we extend our earlier result in (Buchbinder, I.L.; et al. Phys. Lett. B 2021, 820, 136470) for massless fields and employ the complete BRST operator, including the trace constraints, which is used to formulate an irreducible representation with definite integer spin. We generalize the cubic vertices proposed for reducible higher spin fields in (Metsaev, R.R. Phys. Lett. B 2013, 720, 237) in the form of multiplicative and non-multiplicative BRST-closed constituents and calculate the new contributions to the vertex, which contains the additional terms with a smaller number of space-time derivatives. We prove that without traceless conditions for the cubic vertices in (Metsaev, R.R. Phys. Lett. B 2013, 720, 237) it is impossible to provide the noncontradictory Lagrangian dynamics and find explicit traceless solution for these vertices. As the examples, we explicitly construct the interacting Lagrangians for the massive spin of the s field and the massless scalars, both with and without auxiliary fields. The interacting models with different combinations of triples higher spin fields: massive spin s with massless scalar and vector fields and with two vector fields; massless helicity λ with massless scalar and massive vector fields; two massive fields of spins s, 0 and massless scalar is also considered.

show abstract

Finite-time cosmological singularities and the possible fate of the Universe

Cited by 49 publications

References 902 publications

Cosmology of Barrow holographic QCD ghost dark energy and a look into the thermodynamics

Cosmology of Barrow holographic QCD ghost dark energy and a look into the thermodynamics

Tsallis Holographic Dark Energy with Power Law Ansatz Approach

Covariant Cubic Interacting Vertices for Massless and Massive Integer Higher Spin Fields

Contact Info

Product

Resources

About