Results 11 to 20 of about 491,315 (150)

COSMOLOGY IN ISLAM, CONSTRUCTING ISLAMIZATION OF NATURE SCIENCE

Jurnal Al-Dustur, 2022
Cosmology is one of the philosophical and scientific objects that become attention in Greek philosophers, especially Aristotle. However, with the times, this cosmology was found in The Qur’an, exactly in the concept of the sky and earth creation which ...
Muhammad Fiqih Cholidi, Safiya Fadlulah
doaj   +1 more source

Observational constraints on the fractal cosmology

European Physical Journal C: Particles and Fields, 2022
In this paper, we explore a fractal model of the universe proposed by Calcagni (J High Energy Phys 03:120, 2010) for a power-counting renormalizable field theory living in a fractal spacetime.
Mahnaz Asghari, Ahmad Sheykhi
doaj   +1 more source

Light trajectory and shadow shape in the rotating naked singularity

European Physical Journal C: Particles and Fields, 2022
In this paper, we investigate the light trajectories and shadow properties in the rotating version of null naked singularity (NNS) spacetime which is derived using the Newman–Janis algorithm without complexification method.
Vishva Patel, Divya Tahelyani, Ashok B. Joshi, Dipanjan Dey, Pankaj S. Joshi   +4 more
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Extending cosmology: the metric approach [PDF]

, 2012
In this chapter it is shown how the introduction of a fundamental constant of nature with dimensions of acceleration into the theory of gravity makes it possible to extend gravity in a very consistent manner.Comment: 2012, Extending Cosmology: The Metric
Mendoza, S.
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The concept of fractal cosmos, I: Anaxagoras’ cosmology [PDF]

Serbian Astronomical Journal, 2001
The concept of a fractal cosmos occupies a prominent position in the modern cosmology. We trace the development of this concept from the presocratic Greece to the present state of affairs.
Grujić P.V.
doaj   +1 more source

Classical and Quantum Solutions and the Problem of Time in $R^2$ Cosmology [PDF]

, 1995
We have studied various classical solutions in $R^2$ cosmology. Especially we have obtained general classical solutions in pure $R^2$\ cosmology. Even in the quantum theory, we can solve the Wheeler-DeWitt equation in pure $R^2$\ cosmology exactly ...
Banks T, Bell J S, de Alwis S P, Greensite J, Kaori Otsuki, Kasper U, Kazuyasu Shigemoto, Kenmoku M, Kunihiko Uehara, Masakatsu Kenmoku, Mijic M B, Nariai S, Ohkuwa Y, Pimentel L O, Sanders R H, Schmidt H, Starobinsky A A, Stella K, Suzuki H, Utiyama R, Utiyama R, Weinberg S, Whitt B   +22 more
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Post-inflationary brane cosmology [PDF]

, 2001
The brane cosmology has invoked new challenges to the usual Big Bang cosmology. In this paper we present a brief account on thermal history of the post-inflationary brane cosmology. We have realized that it is not obvious that the post-inflationary brane
Affleck, Akama, Antoniadis, Anupam Mazumdar, Arkani-Hamed, Banks, Banks, Barreiro, Bastero-Gil, Benakli, Benakli, Binetruy, Binetruy, Caceres, Choi, Choi, Chung, Cline, Cline, Cline, Copeland, Coughlan, de Carlos, Dine, Dine, Ellis, Ellis, Ellis, Ellis, Fayet, Fukugita, Gherghetta, Giudice, Giudice, Giudice, Horava, Horava, Kallosh, Kawasaki, Kofman, Kofman, Kolb, Lalak, Linde, Lukas, Lukas, Lyth, Maartens, Maroto, Mazumdar, Mazumdar, Mendes, Pagels, Randall, Rubakov, Sarkar, Scherrer, Shakarov, Shatanov, Shiromizu, Stewart, Traschen, Weinberg, Witten   +63 more
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Emergent cosmology from matrix theory

Journal of High Energy Physics, 2022
Matrix theory is a proposed non-perturbative definition of superstring theory in which space is emergent. We begin a study of cosmology in the context of matrix theory.
Suddhasattwa Brahma, Robert Brandenberger, Samuel Laliberte   +2 more
doaj   +1 more source

Producing a Scale-Invariant Spectrum of Perturbations in a Hagedorn Phase of String Cosmology [PDF]

Phys.Rev.Lett.97:021302,2006, 2005
We study the generation of cosmological perturbations during the Hagedorn phase of string gas cosmology. Using tools of string thermodynamics we provide indications that it may be possible to obtain a nearly scale-invariant spectrum of cosmological fluctuations on scales which are of cosmological interest today.
arxiv   +1 more source

Cosmology models with Ω_M-dependent cosmological constant [PDF]

Gen.Rel.Grav. 35 (2003) 1007-1016, 2002
We investigate the evolution of the scale factor in a cosmological model in which the cosmological constant is given by the scalar arisen by the contraction of the stress-energy tensor.
arxiv   +1 more source