76 citations · 173 across the 8 of their papers we have counts for
8 papers
Braneworld cosmology and noncommutative inflation
Gianluca Calcagni
In this work we develop the patch formalism, an approach providing a very simple and compact description of braneworld-motivated cosmologies with nonstandard effective Friedmann eq…
Patch cosmology and noncommutative braneworlds
Gianluca Calcagni
We review extra-dimensional and 4D cosmological scenarios through the effective Friedmann evolution on a brane. Some features involving noncommutative geometry and scalar/tachyon s…
Non-Gaussianity in braneworld and tachyon inflation
Gianluca Calcagni
We calculate the bispectrum of single-field braneworld inflation, triggered by either an ordinary scalar field or a cosmological tachyon, by means of a gradient expansion of large-…
Regularized dualities in patch cosmology
Gianluca Calcagni
Following past investigations, we explore the symmetries of the Hamilton-Jacobi cosmological equations in the generalized patch formalism describing braneworld and tachyon scenario…
Patch dualities and remarks on nonstandard cosmologies
Gianluca Calcagni
In this paper we establish dualities between inflationary, cyclic/ekpyrotic, and phantom cosmologies within the patch formalism approximating high-energy effects in scenarios with…
Braneworld cosmology almost without branes
Gianluca Calcagni
We review some general aspects of braneworld cosmologies in which an inflationary period driven by a scalar field confined on the brane is described by a nonstandard effective Frie…