Results 111 to 120 of about 570 (144)

Phase transitions as the origin of large scale structure in the universe

, 1988
A review of the formation of large scale structure through gravitational growth of primordial perturbations is given. This is followed by a discussion of how symmetry breaking phase transitions in the early universe might have produced the required ...
Turok, Neil, Turok, N.
core  

Brane Effective Actions, Kappa-Symmetry and Applications. [PDF]

Living Rev Relativ, 2012
Simón J.
europepmc   +1 more source

Analysis of s-t symmetric classical S-matrices

Journal of High Energy Physics
We analyze the complex analytic properties of classical i.e. tree-level S-matrices for four scalar particles with s-t crossing symmetry, involving an infinite number of exchanges.
Abhijit Gadde, Shraiyance Jain
doaj   +1 more source

Cartan geometry, supergravity and group manifold approach [PDF]

summary:We make a case for the unique relevance of Cartan geometry for gauge theories of gravity and supergravity. We introduce our discussion by recapitulating historical threads, providing motivations.
François, Jordan, Ravera, Lucrezia
core   +1 more source

Higher-dimensional black holes: Braneworld stars and Hawking radiation. [PDF]

, 2007
In this thesis two aspects of braneworld models are studied. A new attempt at finding the metric of a braneworld black hole within the second Randall-Sundrum model is explored. Branes containing distributions of perfect fluid are embedded in a variety of
Creek, Simon
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On unitarity of the hypergeometric amplitude

Journal of High Energy Physics
The hypergeometric amplitude is a one-parameter deformation of the Veneziano amplitude for four-point tachyon scattering in bosonic string theory that is consistent with S-matrix bootstrap constraints.
Gareth Mansfield, Marcus Spradlin
doaj   +1 more source

A Lightning Introduction to String Theory

We give a lightning introduction to critical string theory, including the 26-dimensional bosonic string, the 10-dimensional superstrings and heterotic strings with and without spacetime supersymmetry. We also discuss open strings and D-branes, as well as
Angelantonj, Carlo, Florakis, Ioannis
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TWO-LOOP VACUUM ENERGY For Calabi-Yau Orbifold Models

, 2013
A precise evaluation of the two-loop vacuum energy is provided for certain Z2×Z2 Calabi-Yau orbifold models in the Heterotic string. The evaluation is based on the recent general prescription for superstring perturbation theory in terms of integra-tion ...
Eric D'Hoker, Duong H. Phong
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The dynamics of cosmological scenarios inspired by quantum gravity

, 2006
PhDIn this thesis we study the dynamics of cosmological scenarios inspired by quantum gravity. Part I investigates novel features of the semi-classical regime of homogeneous and isotropic loop quantum cosmology.
Mulryne, David James
core  

Attraction to a radiation-like era in early superstring cosmologies

, 2009
38 pages, 4 figuresStarting from an initial classical four dimensional flat background of the heterotic or type II superstrings, we are able to determine at the string one-loop level the quantum corrections to the effective potential due to the ...
Kounnas, Costas, Partouche, Herve, Bourliot, Francois   +2 more
core