Zobrazeno 1 - 10
of 56
pro vyhledávání: '"Noorbala, Mahdiyar"'
Autor:
Noorbala, Mahdiyar
Publikováno v:
JCAP10(2024)053
It is well known that a coarse-grained scalar field living on a de~Sitter (dS) background exhibits classical stochastic behavior, driven by a noise whose amplitude is set by the Hubble constant $H$. The coarse-graining is achieved by discarding wave
Externí odkaz:
http://arxiv.org/abs/2408.11640
The tail of the distribution of primordial fluctuations (corresponding to the likelihood of realization of large fluctuations) is of interest, from both theoretical and observational perspectives. In particular, it is relevant for the accurate evalua
Externí odkaz:
http://arxiv.org/abs/2305.19257
Transitions between different inflationary slow-roll scenarios are known to provide short non-slow-roll periods with non-trivial consequences. We consider the effect of quantum diffusion on the inflationary dynamics in a transition process. Using the
Externí odkaz:
http://arxiv.org/abs/2207.10578
Publikováno v:
Phys.Lett.B 834 (2022) 137400
In recent years it has been noted that the perturbative treatment of the statistics of fluctuations may fail to make correct predictions for the abundance of primordial black holes (PBHs). Moreover, it has been shown in some explicit single-field exa
Externí odkaz:
http://arxiv.org/abs/2112.04520
We extend the formalism of stochastic inflation to the setup of non-attractor inflation with a sound speed $c_s$. We obtain the Langevin equations for the superhorizon perturbations and calculate the stochastic corrections to curvature perturbation p
Externí odkaz:
http://arxiv.org/abs/2009.04680
Autor:
Noorbala, Mahdiyar, Firouzjahi, Hassan
Publikováno v:
Phys. Rev. D 100, 083510 (2019)
We study boundary crossing probability in the context of stochastic inflation. We prove that for a generic multi-field inflationary potential, the probability that the inflaton reaches infinitely far regions in the field space is critically dependent
Externí odkaz:
http://arxiv.org/abs/1907.13149
Publikováno v:
JCAP01(2019)040
We study the ultra slow roll model in the context of stochastic inflation. Using stochastic $\delta N$ formalism, we calculate the mean number of $e$-folds, the power spectrum, the bispectrum and the stochastic corrections into these observables. We
Externí odkaz:
http://arxiv.org/abs/1811.02175
Publikováno v:
JCAP09(2018)032
The relative probability to decay towards different vacua during inflation is studied. The calculation is performed in single-field slow-roll potentials using the stochastic inflation formalism. Various situations are investigated, including falling
Externí odkaz:
http://arxiv.org/abs/1806.09634
Autor:
Noorbala, Mahdiyar
There has been recent interest in identifying entanglement as the fundamental concept from which space may emerge. We note that the particular way that a Hilbert space is decomposed into tensor factors is important in what the resulting geometry look
Externí odkaz:
http://arxiv.org/abs/1609.01295
Publikováno v:
Phys. Rev. Lett. 118, 031301 (2017)
Stochastic effects in generic scenarios of inflation with multiple fields are investigated. First passage time techniques are employed to calculate the statistical moments of the number of inflationary $e$-folds, which give rise to all correlation fu
Externí odkaz:
http://arxiv.org/abs/1604.06017