The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We argue that primordial black holes in the early universe can provide an efficient resolution of the Brustein–Steinhardt moduli overshoot problem in string cosmology. When the universe is created near the Planck scale, all the available states in the theory are excited by strong interactions and cosmological particle production. The heavy states are described in the low energy theory as a gas of...
We present new classes of string-like soliton solutions in (N = 1; D = 10), (N = 2; D = 6) and (N = 4;D = 4) heterotic string theory. Connections are made between the solution-generating subgroup of the T-duality group of the compactification and the number of spacetime supersymmetries broken. Analogous solutions are also noted in (N = 1,2;D = 4) compactifications, where a different form of supersymmetry...