Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Thorsten Battefeld"'
Autor:
Thorsten Battefeld, Gaoyuan Wang
Publikováno v:
Journal of Cosmology and Astroparticle Physics
We compute the distribution of minima that are reached dynamically on multi-field axionic landscapes, both numerically and analytically. Such landscapes are well suited for inflationary model building due to the presence of shift symmetries and possi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1dce3c152cd86cc3af1a3483f54f1e5
http://arxiv.org/abs/1512.04224
http://arxiv.org/abs/1512.04224
Autor:
Scott Watson, Thorsten Battefeld
Publikováno v:
Reviews of Modern Physics. 78:435-454
We present a critical review and summary of String Gas Cosmology. We include a pedagogical derivation of the effective action starting from string theory, emphasizing the necessary approximations that must be invoked. Working in the effective theory,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9411c81954ad9cedecf56d33fbb7782a
https://doi.org/10.1103/revmodphys.78.435
https://doi.org/10.1103/revmodphys.78.435
Autor:
Thorsten Battefeld, R. C. Freitas
We discuss a universal bound on any excitation of heavy fields during inflation: the ratio of the heavy field's energy density to the one driving inflation must be less than the maximally allowed relative amplitude of oscillations in the power-spectr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0ed84fff4ca6d897be1d6197f7a630f
We consider trapped inflation in a higher dimensional field space: particle production at a dense distribution of extra species points leads to a terminal velocity at which inflation can be driven in steep potentials. We compute an additional, nearly
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::959da6ac6e240df1138760e5bc27df4a
http://arxiv.org/abs/1309.4082
http://arxiv.org/abs/1309.4082
We derive oscillatory signals in correlation functions in two-field open inflation by means of the in-in formalism; such signatures are caused by resonances between oscillations in the tunnelling field and fluctuations in the inflaton during the curv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1c51fd8d101d8a379abd762bd16ac5b7
http://arxiv.org/abs/1302.3877
http://arxiv.org/abs/1302.3877
Autor:
Thorsten Battefeld, Diana Battefeld
We consider inflation driven near a saddle point in a higher dimensional field space, which is the most likely type of slow roll inflation on the string theoretical landscape; anthropic arguments need to be invoked in order to find a sufficiently fla
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::103f4d83033e5f5b02a33f5f44b2596f
We discuss preheating after multi-field inflation in the presence of several preheat matter fields that become light in the vicinity of (but not at) the inflatons' VEV, at distinct extra-species-points (ESP); this setup is motivated by inflationary m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ac2ae4bd9c6db523920a7fa113a5c3c
http://arxiv.org/abs/1209.3301
http://arxiv.org/abs/1209.3301
Based on random matrix theory, we compute the likelihood of saddles and minima in a class of random potentials that are softly bounded from above and below, as required for the validity of low energy effective theories. Imposing this bound leads to a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb6377a1039a80453d74b8e9b88ec323
Publikováno v:
Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics, 2011, 08, pp.025. ⟨10.1088/1475-7516/2011/08/025⟩
Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2011, 08, pp.025. ⟨10.1088/1475-7516/2011/08/025⟩
Journal of Cosmology and Astroparticle Physics, 2011, 08, pp.025. ⟨10.1088/1475-7516/2011/08/025⟩
Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2011, 08, pp.025. ⟨10.1088/1475-7516/2011/08/025⟩
We consider a two-dimensional model of inflation, where the inflationary trajectory is "deformed" by a grazing encounter with an Extra Species/Symmetry Point (ESP) after the observable cosmological scales have left the Hubble radius. The encounter en
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a9ef3be03fa55a5d18a62edb0174ddd6
https://hal.science/hal-00716134
https://hal.science/hal-00716134
Autor:
Jan Niklas Grieb, Thorsten Battefeld
We discuss bispectra of single-field inflationary models described by general Lorentz invariant Lagrangians that are at most first order in field derivatives, including the fast-roll models investigated by Noller and Magueijo. Based on a factor analy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a0a235752a81875d8f02650dbb02295b