Zobrazeno 1 - 10
of 233
pro vyhledávání: '"Dey, Dipanjan"'
In this article, we propose a new way to handle interactions between two scalar fields in the cosmological backdrop where one scalar field oscillates rapidly in the cosmological time scale while the other does not show any periodic behavior in the sa
Externí odkaz:
http://arxiv.org/abs/2410.20736
We explore the possibilities of modeling a spherically symmetric static spacetime that can emerge as the end state of gravitational collapse, by considering it to be seeded by a composite fluid made of matter and a scalar field. In this scenario, the
Externí odkaz:
http://arxiv.org/abs/2409.01110
In this work, we investigate tidal forces in the Lemaitre-Tolman-Bondi (LTB) metric, focusing on both hidden and locally visible singularities. We discuss the strength of these singularities in terms of deformationally strong singularities. Specifica
Externí odkaz:
http://arxiv.org/abs/2407.19508
In this article we address the puzzle related to the existence of a proper cosmological solution, where the number of equations exceeds the number of unknown functions. Although only two of the various dynamical equations are independent, the solutio
Externí odkaz:
http://arxiv.org/abs/2404.13332
This paper explores the cosmological implications of a scalar field with a specific potential, crucial for achieving the final equilibrium state of gravitational collapse. We consider a system with two fluids: minimally coupled matter representing du
Externí odkaz:
http://arxiv.org/abs/2404.03901
This paper explores the evolution of the over-dense region of dark matter in the presence of a non-minimally coupled scalar field which is used to model quintessence and phantom-like dark energy. We focus on algebraic coupling, where the interaction
Externí odkaz:
http://arxiv.org/abs/2401.11957
This paper defines the photon surface conditions using Cartan scalars within an invariant spin frame, offering a comprehensive description of the local spacetime geometry. By employing this approach, we gain novel insights into the geometry and dynam
Externí odkaz:
http://arxiv.org/abs/2401.11936
We investigate spherically symmetric static and dynamical Brans-Dicke theory exact solutions using invariants and, in particular, the Newman Penrose formalism utilizing Cartan scalars. The GR limit of these solutions is examined through the use of Ca
Externí odkaz:
http://arxiv.org/abs/2310.06783
We study the model of spherically symmetric and spatially homogeneous gravitational collapse of a minimally coupled scalar field. Our study focuses on obtaining the scalar field potential that leads to a final equilibrium state in the gravitational c
Externí odkaz:
http://arxiv.org/abs/2308.03603
In this work, we propose a model of the gravitational collapse of dark matter in the presence of quintessence or phantom-like scalar fields. Our treatment is based on the principles of general relativity up to virialization. We have chosen a spherica
Externí odkaz:
http://arxiv.org/abs/2306.00805