Zobrazeno 1 - 10
of 2 574
pro vyhledávání: '"Cosmological Models"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 12, Pp 1-66 (2024)
Abstract We revisit one-loop corrections to the power spectrum of curvature perturbations ζ in an inflationary scenario containing a transient ultra-slow-roll (USR) period. In ref. [1], it was argued that one-loop corrections to the power spectrum o
Externí odkaz:
https://doaj.org/article/e3c2856b2fb44710b51a01ea8e42763d
Autor:
Gianluca Calcagni, Leonardo Modesto
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 12, Pp 1-41 (2024)
Abstract We propose a testable alternative to inflation directly built in a very general class of ultraviolet complete theories of quantum gravity enjoying Weyl invariance. After the latter is spontaneously broken, logarithmic quantum corrections to
Externí odkaz:
https://doaj.org/article/363aa905a31f43cab4aa717edf99dbfa
Autor:
Bingchu Fan, Zhong-Zhi Xianyu
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 12, Pp 1-65 (2024)
Abstract The correlators of large-scale fluctuations belong to the most important observables in modern cosmology. Recently, there have been considerable efforts in analytically understanding the cosmological correlators and the related wavefunction
Externí odkaz:
https://doaj.org/article/38def92f0dee453a949af84ee32380f9
Autor:
Hagar Ariela Meir
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 12, Pp 1-14 (2024)
Abstract In this paper, I construct a bouncing cosmology by considering the backreaction of the winding condensate on a 1+1 dimensional cosmological model with a periodic spatial coordinate. I based my work on previous results that considered the bac
Externí odkaz:
https://doaj.org/article/e92bd546433943849318d8f0b154180b
Autor:
Denis Werth
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 12, Pp 1-45 (2024)
Abstract Cosmological correlation functions are significantly more complex than their flat-space analogues, such as tree-level scattering amplitudes. While these amplitudes have simple analytic structure and clear factorisation properties, cosmologic
Externí odkaz:
https://doaj.org/article/9c96f35d93b4478ea8f33c3e7437c374
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 11, Pp 1-19 (2024)
Abstract Pseudo-Hermitian system is a class of non-Hermitian system with Hamiltonian satisfying the condition η −1 H † η = H. We develop the in-in and Schwinger Keldysh formalism to calculate cosmological correlators for pseudo-Hermitian system
Externí odkaz:
https://doaj.org/article/2aa395e7a2104122b9f940d3ba7cee28
Autor:
S. Kazempour, A. R. Akbarieh
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 11, Pp 1-15 (2024)
Abstract In this paper, we present a novel extension of massive gravity theory; the Brane-Chern-Simons massive gravity theory. We explore the cosmological implications of this theory by deriving the background equations and demonstrating the existenc
Externí odkaz:
https://doaj.org/article/5c5bbb8357ce4e839c6745419d9dd964
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 11, Pp 1-26 (2024)
Abstract We construct a multiverse model where empty AdS d+1 space is cut off by a pair of accelerated dS d space universes, at a finite AdS boundary cutoff which we treat as a T 2 deformation in the holographic dual, and one in the AdS interior, the
Externí odkaz:
https://doaj.org/article/2d76b005e6a443a4adf02310fe735833
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 11, Pp 1-33 (2024)
Abstract We study a scenario with a transient phase of cosmological acceleration that could potentially be realized in asymptotic corners of String Theory moduli space. A very steep scalar potential is temporarily stabilized by the effect of a nonzer
Externí odkaz:
https://doaj.org/article/973708997128484a8b58913660a42cc4
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 10, Pp 1-84 (2024)
Abstract In our quest to understand the generation of cosmological perturbations, we face two serious obstacles: we do not have direct information about the environment experienced by primordial perturbations during inflation, and our observables are
Externí odkaz:
https://doaj.org/article/e39580ac1bda491fbaa50429fda2b775