cosmological constant


  • WordNet 3.6
    • n cosmological constant an arbitrary constant in the equations of general relativity theory
    • ***


In news:

Quantum entanglements unify the infinitesimal aspects of virtual particles into momentary states between existence and nonexistence, while precise cosmological constants undergird the multitudinous dimensions of space-time.

In science:

A are respectively the Euler characteristic and area of the tessellation (respectively measured via χ = #faces−#edges+#vertices and A = #tiles), and where N and g are the discrete counterparts of the Newton constant and cosmological constant.
Geometrically Constrained Statistical Models on Fixed and Random Lattices: From Hard Squares to Meanders
T µν , the cosmological constant is not ’constant’.
Unimodular relativity and cosmological constant : Comments
While formally theories exist with a constant equation of state, they are nongeneric – Einstein’s cosmological constant is a notable exception.
Is Dark Energy Dynamical? Prospects for an Answer
Langlois, “Brane cosmological evolution in a bulk with cosmological constant,” Phys.
Holography and Brane-bulk Energy Exchange
As this acceleration could be brought about by an effective negative pressure, the first choice of candidate for this ‘dark energy’ had been the ‘cosmological constant’ or a time varying cosmological parameter Λ(t).
Acceleration of the universe with a simple trigonometric potential
Most simply, if the current acceleration of the Universe is caused by a cosmological constant, then w = −1 is constant with time.
Rates and Progenitors of Type Ia Supernovae
Models predicting a constant w = w0 , including those invoking a cosmological constant, are the easiest to test.
Rates and Progenitors of Type Ia Supernovae
M are Hermitian matrices of dimension N and the gn are coupling constants involving appropriate powers of the cosmological constant.
Random Matrices
Keywords: cosmological constant; fine-structure constant; Hubble law; lunar ranging laser data; vacuum permitivity and permeability.
A simple varying-speed-of-light hypothesis is enough for explaining high-redshift supernovae data
Let’s consider the possible classical behaviors of cosmological geometry assuming the ‘no-boundary’ quantum state of the universe in a theory with only gravity and a cosmological constant Λ.
Generalizing Quantum Mechanics for Quantum Spacetime
Universe, where the dark energy has been assumed to have a constant equation of state with w = −1, as is the case for a cosmological constant.
Measurement of \Omega_m, \Omega_{\Lambda} from a blind analysis of Type Ia supernovae with CMAGIC: Using color information to verify the acceleration of the Universe
To avoid semantical misinterpretation we note that we consider a cosmology with Einsteinian cosmological constant.
A Reply to a Comment on "Dark matter: A phenomenological existence proof"
As such we stand by our conclusion that if the universe is described by a spatially flat Friedmann-Robertson-Walker (FRW) cosmology with Einsteinian cosmological constant then the resulting cosmology predicts a significant dark matter component in the universe.
A Reply to a Comment on "Dark matter: A phenomenological existence proof"
Namely, even for maximally symmetric cosmologies filled purely with dust the past radii/scales of the Universe R(t), so the past distances xi and redshifts zi depend on the cosmologic constant which belongs to the Law of Gravity not to Matter, so it is not directly observable.
On a Possible Indicator of Homogeneity of the Universe
The “parameters” (“z -region”) column gives the cosmological parameters (the redshift region) which are the most efficient to distinguish the DE model from a cosmological constant.
Sensitivity and figures of merit for dark energy supernovae surveys