scholarly journals Realizing scale-invariant density perturbations in low-energy effective string theory

2007 ◽  
Vol 75 (2) ◽  
Author(s):  
Zong-Kuan Guo ◽  
Nobuyoshi Ohta ◽  
Shinji Tsujikawa
Keyword(s):  
String Theory ◽  
Low Energy ◽  
Invariant Density ◽  
Scale Invariant ◽  
Density Perturbations ◽  
Effective String Theory

scholarly journals GENERATION OF SCALE INVARIANT DENSITY PERTURBATIONS IN A CONFORMALLY INVARIANT INERT HIGGS DOUBLET MODEL

2013 ◽  
Vol 28 (19) ◽  
pp. 1350094 ◽  
Author(s):  
MOUMITA DAS ◽  
SUBHENDRA MOHANTY
Keyword(s):  
Scalar Potential ◽  
Higgs Field ◽  
Density Perturbation ◽  
Coupled System ◽  
Higgs Doublet ◽  
Invariant Density ◽  
Scale Invariant ◽  
Conformally Invariant ◽  
Density Perturbations ◽  
Doublet Model

If a Higgs field is conformally coupled to gravity, then it can give rise to the scale invariant density perturbations. We make use of this result in a realistic inert Higgs doublet model, where we have a pair of Higgs doublets conformally coupled to the gravity in the early universe. The perturbation of the inert Higgs is shown to be the scale invariant. This gives rise to the density perturbation observed through CMB by its couplings to the standard model Higgs and the subsequent decay. Loop corrections of this conformally coupled system gives rise to electroweak symmetry breaking. We constrain the couplings of the scalar potential by comparing with the amplitude and spectrum of CMB anisotropy measured by WMAP and this model leads to a prediction for the masses of the lightest Higgs and the other scalars.

scholarly journals Non-scale-invariant density perturbations from chaotic extended inflation

1992 ◽  
Vol 45 (6) ◽  
pp. 1961-1970 ◽  
Author(s):  
Silvia Mollerach ◽  
Sabino Matarrese
Keyword(s):  
Invariant Density ◽  
Scale Invariant ◽  
Density Perturbations

scholarly journals Cosmological and wormhole solutions in low-energy effective string theory

1994 ◽  
Vol 50 (10) ◽  
pp. 6435-6443 ◽  
Author(s):  
Mariano Cadoni ◽  
Marco Cavaglià
Keyword(s):  
String Theory ◽  
Low Energy ◽  
Effective String Theory

scholarly journals Scale invariant density perturbations from cyclic cosmology

2016 ◽  
Vol 31 (13) ◽  
pp. 1650076 ◽  
Author(s):  
Paul Howard Frampton
Keyword(s):  
Large Scale ◽  
Quantum Fluctuations ◽  
Large Scale Structure ◽  
Density Fluctuations ◽  
Scale Structure ◽  
Invariant Density ◽  
Scale Invariant ◽  
Density Perturbations

It is shown how quantum fluctuations of the radiation during the contraction era of a comes back empty (CBE) cyclic cosmology can provide density fluctuations which re-enter the horizon during the subsequent expansion era and at lowest order are scale invariant, in a Harrison–Zel’dovich–Peebles sense. It is necessary to be consistent with observations of large scale structure.

scholarly journals Instability of theR3×S1vacuum in low-energy effective string theory

1995 ◽  
Vol 52 (4) ◽  
pp. 2583-2586
Author(s):  
Mariano Cadoni ◽  
Marco Cavaglià
Keyword(s):  
String Theory ◽  
Low Energy ◽  
Effective String Theory

ENERGY-MOMENTUM COMPLEXES FOR A STRINGY BLACK HOLE GEOMETRY IN A LOW-ENERGY EFFECTIVE STRING THEORY

2009 ◽  
Vol 24 (08n09) ◽  
pp. 1606-1609 ◽  
Author(s):  
I. RADINSCHI ◽  
TH. GRAMMENOS
Keyword(s):  
Black Hole ◽  
String Theory ◽  
Momentum Distribution ◽  
Low Energy ◽  
Scalar Charge ◽  
Momentum Distributions ◽  
Hole Geometry ◽  
Energy And Momentum ◽  
Effective String Theory

The energy and momentum distributions for a four-dimensional, magnetically charged, stringy black hole geometry, in a low-energy effective string theory, are calculated. To this purpose, the energy-momentum complexes of Einstein, Landau-Lifshitz, Weinberg and Møller are applied. It is found that, in all four prescriptions, the momentum distribution vanishes, while the energies obtained differ, but all are functions of the mass, the scalar charge, and the boost parameter.

Conditions for generating scale-invariant density perturbations

2004 ◽  
Vol 69 (10) ◽  
Author(s):  
Steven Gratton ◽  
Justin Khoury ◽  
Paul J. Steinhardt ◽  
Neil Turok
Keyword(s):  
Invariant Density ◽  
Scale Invariant ◽  
Density Perturbations
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