Dynamical systems applied to cosmology: dark energy and modified gravity
Abstract The Nobel Prize winning confirmation in 1998 of the accelerated expansion of our
Universe put into sharp focus the need of a consistent theoretical model to explain the origin …
Universe put into sharp focus the need of a consistent theoretical model to explain the origin …
Dynamics of dark energy
We review in detail a number of approaches that have been adopted to try and explain the
remarkable observation of our accelerating universe. In particular we discuss the arguments …
remarkable observation of our accelerating universe. In particular we discuss the arguments …
Cosmological constant—the weight of the vacuum
T Padmanabhan - Physics reports, 2003 - Elsevier
Recent cosmological observations suggest the existence of a positive cosmological constant
Λ with the magnitude Λ (Gℏ/c3)≈ 10− 123. This review discusses several aspects of the …
Λ with the magnitude Λ (Gℏ/c3)≈ 10− 123. This review discusses several aspects of the …
Accelerated expansion of the universe driven by tachyonic matter
T Padmanabhan - Physical Review D, 2002 - APS
It is an accepted practice in cosmology to invoke a scalar field with a potential V (φ) when
the observed evolution of the universe cannot be reconciled with theoretical prejudices …
the observed evolution of the universe cannot be reconciled with theoretical prejudices …
Traversable wormholes with arbitrarily small energy condition violations
M Visser, S Kar, N Dadhich - Physical review letters, 2003 - APS
Traversable wormholes necessarily require violations of the averaged null energy condition,
this being the definition of “exotic matter.” However, the theorems which guarantee the …
this being the definition of “exotic matter.” However, the theorems which guarantee the …
Purely Kinetic Essence as Unified Dark Matter
RJ Scherrer - Physical review letters, 2004 - APS
We examine k-essence models in which the Lagrangian p is a function only of the
derivatives of a scalar field φ and does not depend explicitly on φ. The evolution of φ for an …
derivatives of a scalar field φ and does not depend explicitly on φ. The evolution of φ for an …
Gravity and the thermodynamics of horizons
T Padmanabhan - Physics Reports, 2005 - Elsevier
Spacetimes with horizons show a resemblance to thermodynamic systems and it is possible
to associate the notions of temperature and entropy with them. Several aspects of this …
to associate the notions of temperature and entropy with them. Several aspects of this …
Cosmology with tachyon field as dark energy
We present a detailed study of cosmological effects of homogeneous tachyon matter
coexisting with nonrelativistic matter and radiation, concentrating on the inverse square …
coexisting with nonrelativistic matter and radiation, concentrating on the inverse square …
[HTML][HTML] Infrared cut-off proposal for the holographic density
LN Granda, A Oliveros - Physics Letters B, 2008 - Elsevier
We propose an infrared cut-off for the holographic the dark energy, which besides the
square of the Hubble scale also contains the time derivative of the Hubble scale. This avoids …
square of the Hubble scale also contains the time derivative of the Hubble scale. This avoids …
Gravitational decoupling minimal geometric deformation model in modified f (R, T) gravity theory
The present paper is devoted to investigating the possibility of getting stellar interiors for
ultra-dense compact spherical systems portraying an anisotropic matter distribution …
ultra-dense compact spherical systems portraying an anisotropic matter distribution …