Results 81 to 90 of about 68,446 (163)

Inflation scenario in a non-minimal f(Q) gravity model

Physics Letters B
In the context of f(Q) gravity, cosmological inflation takes a different turn. f(Q) gravity is a modified theory of gravity, where the Lagrangian is a function of the non-metricity scalar Q.
S. Davood Sadatian, S. Mohamad Reza Hosseini   +1 more
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MODIFIED GRAVITY AND GRAVITATIONAL REPULSION

Particle Physics at the Year of Centenary of Bruno Pontecorvo, 2015
n ...
Elena Arbuzova, Alexander D. Dolgov
openaire   +2 more sources

Horizon entropy in modified gravity [PDF]

Physical Review D, 2005
We present an observation about the proposal that four-dimensional modification of general relativity may explain the observed cosmic acceleration today. Assuming that the thermodynamical nature of gravity theory continues to hold in modified gravity theories, we derive the modified horizon entropy formula from the modified Friedmann equation. We argue
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Superstatistics and Gravitation

Entropy, 2010
We suggest to consider the spacetime as a non-equilibrium system with a long-term stationary state that possess as a spatio-temporally fluctuating quantity ß . These systems can be described by a superposition of several statistics, superstatistics.
Octavio Obregón
doaj   +1 more source

Modified gravity or modified matter ?

, 2009
6 pages, to appear in l'Astronomie (in French)
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Contemplating the Fate of Modified Gravity

Universe
Possible models of modified gravity are being extensively studied now, with most phenomenological motivations coming from puzzles and tensions in cosmology due to a natural desire to better fit the known and newly coming data. At the same time, available experimental evidence is limited for testing gravity as a force beyond the regimes in which the ...
Alexey Golovnev, María-José Guzmán
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Shedding light on gravity: Black hole shadows and lensing signatures in Lorentz gauge theory

Nuclear Physics B
Recent advances, including gravitational wave detections and imaging of black hole shadows, have strongly validated general relativity. Nevertheless, ongoing cosmological observations suggest potential limitations of general relativity, spurring interest
Ali Övgün, Mohsen Fathi
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Gravitational Waves in Modified Gravity

, 2015
Bachelor ...
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Dark Energy and Modified Gravities

Вестник Томского государственного педагогического университета, 2004
We review the several models of the dark energy, which may generate the accelerated expansion of the present universe. We also discuss the the Big Rip singularity, which may occur when the equation of the state parameter w is less than -1. We show that the quantum correction would be very important near the singularity.
openaire   +3 more sources

Mechanism and efficiency analysis of carbon dioxide capture by modified 13X molecular sieve enhanced by high-gravity technology

Adsorption Science & Technology
13X molecular sieve (MS) was modified with diethylenetriamine (DETA) using a high-gravity rotating adsorption bed, and subsequent carbon dioxide (CO 2 ) adsorption experiments were conducted in a high-gravity rotating adsorption bed. The results indicate
Qiang Guo, Jiahao Niu, Guisheng Qi
doaj   +1 more source