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8 papers · 2 filters
Formation and evolution of cosmic D-strings
Gia Dvali, Alexander Vilenkin
We study the formation of D and F-cosmic strings in D-brane annihilation after brane inflation. We show that D-string formation by quantum de Sitter fluctuations is severely suppre…
Coincident brane nucleation and the neutralization of Λ
Jaume Garriga, Ariel Megevand
Nucleation of branes by a four-form field has recently been considered in string motivated scenarios for the neutralization of the cosmological constant. An interesting question in…
Dark energy equation of state and anthropic selection
Jaume Garriga, Andrei Linde, Alexander Vilenkin
We explore the possibility that the dark energy is due to a potential of a scalar field and that the magnitude and the slope of this potential in our part of the universe are large…
Inflating magnetically charged braneworlds
Inyong Cho, Alexander Vilenkin
Numerical solutions of Einstein, scalar, and gauge field equations are found for static and inflating defects in a higher-dimensional spacetime. The defects have -dimensiona…
Null energy conditions outside a background potential
Delia Schwartz Perlov, Ken D. Olum
We study the Casimir energy of a minimally coupled, real, massless scalar field outside a spherically symmetric background potential. We obtain a general expression for the null en…
Cosmic Attractors and Gauge Hierarchy
Gia Dvali, Alexander Vilenkin
We suggest a new cosmological scenario which naturally guarantees the smallness of scalar masses and VEVs, without invoking supersymmetry or any other (non-gravitationaly coupled)…