Results 1 to 10 of about 2,199,245 (317)
Scientific Reports, 2022 We use the first principle calculation to investigate the intrinsic magnetism of graphitic carbon nitrides (GCNs). By preserving three-fold symmetry, the GCN building blocks have been built out of different combinations between 6 components which are C ...
Teerachote Pakornchote +4 more
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Energy conditions and junction conditions [PDF]
Physical Review D, 2005 10 pages; v2: minor corrections, brief comments on negative energy spacetimes in sec.4 ...
Marolf, Donald, Yaida, Sho
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Traversable Finslerian wormholes supported by phantom energy
Frontiers in Physics, 2023 This paper supplements the article (Eur. Phys. J. C 76: 246, 2016) by extending some more new wormhole solutions in the background of Finslerian geometry.
Ksh. Newton Singh +3 more
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Reconstruction of cosmological models are inspired by generalization of the Chaplygin gas
Қарағанды университетінің хабаршысы. Физика сериясы, 2022 This paper considers models arising from the composition of the modified Gauss–Bonnet gravity (the Gauss–Bonnet invariant) and the general relativity (the Ricci scalar) against the background of a flat, homogeneous, and isotropic space-time described by
П.Ю. Цыба +2 more
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TWILIGHT FOR THE ENERGY CONDITIONS? [PDF]
International Journal of Modern Physics D, 2002 The tension, if not outright inconsistency, between quantum physics and general relativity is one of the great problems facing physics at the turn of the millennium. Most often, the problems arising in merging Einstein gravity and quantum physics are viewed as Planck scale issues (1019 GeV , 10-34 m , 10-45 s ), and so safely beyond the reach of ...
Barceló, Carlos, Visser, Matt
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High-temperature superconductor of sodalite-like clathrate hafnium hexahydride
Scientific Reports, 2021 Hafnium hydrogen compounds have recently become the vibrant materials for structural prediction at high pressure, from their high potential candidate for high-temperature superconductors.
Prutthipong Tsuppayakorn-aek +3 more
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Bouncing Cosmology in Modified Gravity with Higher-Order Gauss–Bonnet Curvature Term
Universe, 2022 In this paper, we studied the bouncing behavior of the cosmological models formulated in the background of the Hubble function in the F(R,G) theory of gravity, where R and G, respectively, denote the Ricci scalar and Gauss–Bonnet invariant.
Santosh V. Lohakare +3 more
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Damour–Solodukhin Wormhole as a Black Hole Mimicker: The Role of Observers’ Location
Universe, 2022 It has been recently argued that in semi-classical gravity, a minimal 2-sphere is not a horizon but a tiny throat of a wormhole, such as the Damour–Solodukhin wormhole (DSWH), with a free parameter λ≠0 separating it from a Schwarxzschild black hole (BH) (
Kamal K. Nandi +3 more
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NULL ENERGY CONDITION AND DARK ENERGY MODELS [PDF]
Modern Physics Letters A, 2008 Null Energy Condition (NEC) requires the equation of state (EoS) of the universe wu satisfy wu ≥ -1, which implies, for instance in a universe with matter and dark energy dominating wu = w m Ω m + w de Ω de = w de Ω de ≥ -1. In this paper we study constraints on the dark energy models from the requirement of the NEC.
Qiu, Taotao, Cai, Yi-Fu, Zhang, Xin-Min
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Almost-Pseudo-Ricci Symmetric FRW Universe with a Dynamic Cosmological Term and Equation of State
Universe, 2021 The objective of the present paper is to investigate an almost-pseudo-Ricci symmetric FRW spacetime with a constant Ricci scalar in a dynamic cosmological term Λ(t) and equation of state (EoS) ω(t) scenario. Several cosmological parameters are calculated
Sanjay Mandal +3 more
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