8 citations · 11 across the 3 of their papers we have counts for
6 papers · 1 filter
Naturally Time Dependent Cosmological Constant
Andrea Gregori
In the light of the proposal of hep-th/0207195, we discuss in detail the issue of the cosmological constant, explaining how can string theory naturally predict the value which is e…
Entropy, String Theory, and our World
Andrea Gregori
We investigate the consequences of two assumptions for String (or M) Theory, namely that: 1) all coordinates are compact and bound by the horizon of observation, 2) the ``dynamics'…
The d=6, N=1 heterotic string does not "live" in six dimensions
Andrea Gregori
We discuss why the N_6=1 heterotic string has to be viewed as something similar to a ``non-compact orbifold''. Only the perturbative spectrum is forced to satisfy the constraints i…
Rank 48 gauge group in heterotic string
Andrea Gregori
We discuss the existence of a non-perturbative gauge sector that can raise the rank of the gauge group of the N_4=2 heterotic string up to 48. These gauge bosons, that don't exist…
Weak Scale in Heterotic String
Andrea Gregori
We investigate the possibility of lowering the string scale in four dimensional heterotic models possessing a non-perturbative extension of the gauge group. In particular, we consi…
Non-perturbative string connections
Andrea Gregori
We discuss the duality between two type I compactifications to four dimensions and an heterotic construction with spontaneous breaking of the N=4 supersymmetry to N=2. This duality…