Results 91 to 100 of about 16,133 (302)

The dynamics of cosmological scenarios inspired by quantum gravity [PDF]

, 2006
PhDIn this thesis we study the dynamics of cosmological scenarios inspired by quantum gravity. Part I investigates novel features of the semi-classical regime of homogeneous and isotropic loop quantum cosmology.
Mulryne, David James
core  

The Great Cosmic Silence: What Does the Fermi Paradox Tell About the Future of Humanity?

Global Policy, EarlyView.
ABSTRACT This article examines how institutional time horizons shape the long‐term survival prospects of human technological civilisation. While research on global catastrophic and existential risks has expanded, the temporal structures of political‐economic institutions remain underexamined.
Heikki Patomäki
wiley   +1 more source

Holographic self-tuning of the cosmological constant

Journal of High Energy Physics, 2017
We propose a brane-world setup based on gauge/gravity duality in which the four-dimensional cosmological constant is set to zero by a dynamical self-adjustment mechanism. The bulk contains Einstein gravity and a scalar field. We study holographic RG flow
Christos Charmousis, Elias Kiritsis, Francesco Nitti   +2 more
doaj   +1 more source

Electronic Journal of Theoretical Physics Spinning of Particles in Schwarzschild-de-Sitter and Schwarzschild-Anti-de-Sitter Space-Times with [PDF]

, 2006
: Spinning of particles in SdS and SAdS space-times with effective cosmological constant is discussed in details. It is shown that the equilibrium conditions are independent of the spin of the test particles and are satisfied only for particular ...
El-nabulsi Ahmad Rami, Effective Cosmological Constant   +1 more
core  

A new cosmological constant model [PDF]

, 1995
We propose a new cosmological model with a time-dependent cosmological constant (\Lambda\propto 1/t^2), which starting at the Planck time as \Lambda_{Pl}\sim M^2_{Pl}, evolves to the present-day allowed value of \Lambda_0\sim10^{-120}M^2_{Pl}.
Lopez, Jorge L., Nanopoulos, Dimitri V.
core   +1 more source

The Mutable Original: How Chinese Counterfeits Become Nigerian Originals in African Markets

American Anthropologist, EarlyView.
ABSTRACT Affordable Chinese copies of Western brands are ubiquitous in African markets. Despite democratizing consumer access, these goods appear to cement hegemonic value hierarchies that rank Chinese or local products as inferior to Western goods.
Jing Jing Liu
wiley   +1 more source

Cosmological backreaction : from the local Hubble expansion rate to dark energy [PDF]

, 2008
Li N. Cosmological backreaction : from the local Hubble expansion rate to dark energy. Bielefeld (Germany): Bielefeld University; 2008.Despite the glorious successes of modern cosmology, our understanding of the cosmic substitution is still limited to a ...
Li, Nan
core   +1 more source

The Unbecoming Ghost: Spectropolitics in the Making and Unmaking of BHU's Bhoot Vidya Ayurveda Certificate Program

Anthropology of Consciousness, EarlyView.
ABSTRACT This essay examines the controversy surrounding the Bhoot Vidya certificate program proposed by the Faculty of Ayurveda at Banaras Hindu University in 2019. Drawing on media coverage, curricular materials, and government policy, I analyze how the debate reveals broader tensions in the politics of contemporary Ayurveda, nationalism, and ...
Thomas Seibel
wiley   +1 more source

Dynamical cosmological constant

Physical Review D
The dynamical realization of the equation of state p+ρ=0 is studied. A nonpathological dynamics for the perturbations of such a system mimicking a dynamical cosmological constant (DCC) requires to go beyond the perfect fluid paradigm. It is shown that an anisotropic stress must be always present. The Hamiltonian of the system in isolation resembles the
G. di Donato, L. Pilo
openaire   +2 more sources

Cosmological Constant Versus Quintessence [PDF]

International Journal of Theoretical Physics, 2000
There is some evidence that the Universe is presently undergoing accelerating expansion. This has restored some credit to the scenarios with a non-vanishing cosmological constant. From the point of view of a theory of fundamental interactions, one may argue that a dynamical component with negative pressure is easier to achieve.
openaire   +3 more sources