Results 11 to 20 of about 4,095 (225)
Tachyon field in loop cosmology
Physics Letters B, 2020 The evolutionary pictures of tachyon field in modified loop cosmology have been investigated. We present the dynamical behavior of the tachyon field associated with an exponential potential and find that the pre-inflation dynamics are very similar in ...
Kui Xiao
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Modulated reheating and large non-gaussianity in string cosmology [PDF]
, 2012 A generic feature of the known string inflationary models is that the same physics that makes the inflaton lighter than the Hubble scale during inflation often also makes other scalars this light.
CICOLI, MICHELE +9 more
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Topics in Cosmology—Clearly Explained by Means of Simple Examples
Universe, 2022 This is a very comprehensible review of some key issues in modern cosmology. Simple mathematical examples and analogies are used, whenever available. The starting point is the well-known Big Bang cosmology (BBC).
Jaume de Haro, Emilio Elizalde
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Inflation in multidimensional quantum cosmology [PDF]
Physical Review D, 1996 We extend to multidimensional cosmology Vilenkin's prescription of tunnelling from nothing for the quantum origin of the observable Universe. Our model consists of a $D+4$-dimensional spacetime of topology ${\cal R}\times {\cal S}^3 \times{\cal S}^D$, with a scalar field (``chaotic inflaton'') for the matter component.
Carugno, Enrico +3 more
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European Physical Journal C: Particles and Fields, 2021 We study cosmological inflation and its dynamics in the framework of the Randall–Sundrum II brane model. In particular, we analyze in detail four representative small-field inflationary potentials, namely Natural inflation, Hilltop inflation, Higgs-like ...
Constanza Osses +2 more
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New Anisotropic Exact Solution in Multifield Cosmology
Universe, 2021 In the case of two-scalar field cosmology, and specifically for the Chiral model, we determine an exact solution for the field equations with an anisotropic background space.
Andronikos Paliathanasis
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Entropic Inflation in Presence of Scalar Field
Universe, 2023 In spirit of the recently proposed four-parameter generalized entropy of apparent horizon, we investigate inflationary cosmology where the matter field inside of the horizon is dominated by a scalar field with a power law potential (i.e., the form of ϕn ...
Sergei D. Odintsov +2 more
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Inflation in the Rényi cosmology [PDF]
Modern Physics Letters A, 2019 The description of the accelerated phases for the current and primordial cosmos has been obtained in the framework of Rényi cosmology. The results show that corrections to the Friedmann equations, originated from differences between Rényi and Bekenstein entropies, can describe both the current accelerated and inflationary eras.
Moradpour, H. +3 more
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INFLATION AND STRING COSMOLOGY [PDF]
International Journal of Modern Physics A, 2002 I will give a brief review of the various versions of inflationary theory, from Starobinsky model to chaotic inflation, and of recent observational data supporting inflationary theory. In the second part of the talk I will discuss the recently proposed ekpyrotic scenario and argue that in its present form it does not provide a viable alternative to ...
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Inflation with a negative cosmological constant [PDF]
Physical Review D, 2009 We find a unique way of realizing inflation through cyclic phases in an universe with negative vacuum energy. According to the second law of thermodynamics entropy monotonically increases from cycle to cycle, typically by a constant factor. This means that the scale factor at the same energy density in consecutive cycles also increases by a constant ...
Biswas, T., Mazumdar, Anupam
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