(Quasi-) de Sitter solutions across dimensions and the TCC bound

Autor: Ludwig Horer, David Andriot

Publikováno v: Journal of High Energy Physics

In this work, we investigate the existence of string theory solutions with a $d$-dimensional (quasi-) de Sitter spacetime, for $3 \leq d \leq 10$. Considering classical compactifications, we derive no-go theorems valid for general $d$. We use them to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::61783fabec1a303e02b3b17b30236aed
http://repo.scoap3.org/api

Do supernovae indicate an accelerating universe?

Autor: Subir Sarkar, Roya Mohayaee, Mohamed Rameez

Publikováno v: Eur.Phys.J.ST
Eur.Phys.J.ST, 2021, 230 (9), pp.2067-2076. ⟨10.1140/epjs/s11734-021-00199-6⟩

In the late 1990's, observations of 93 Type Ia supernovae were analysed in the framework of the FLRW cosmology assuming these to be `standard(isable) candles'. It was thus inferred that the Hubble expansion rate is accelerating as if driven by a posi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a373ebf21b6b185ec73783d7d94195f1
https://doi.org/10.1140/epjs/s11734-021-00199-6

Singularity formation in asymptotically safe cosmology with inhomogeneous equation of state

Autor: Oem Trivedi, Maxim Khlopov

Publikováno v: JCAP
JCAP, 2022, 11, pp.007. ⟨10.1088/1475-7516/2022/11/007⟩

Interest in cosmological singularities has remarkably grown in recent times, particularly on future singularities with the discovery of late-time acceleration of the universe and dark energy. While such explorations have previously been done in vario

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7a1dea130cd192cff4dbc360cfbea1c
http://arxiv.org/abs/2204.06437

A Cautionary Tale: Dark Energy in Single-Field, Slow-Roll Inflationary Models

Autor: Castello, Sveva, Ilić, Stéphane, Kunz, Martin

The current epoch of accelerated cosmic expansion is postulated to be driven by dark energy, which in the standard model takes the form of a cosmological constant with equation of state parameter $w=-1$. We propose an innovative perspective over the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::023e40e947785d31410cd7deaae4eaaa

Probing inflation with large-scale structure data: the contribution of information at small scales

Autor: Ivan Debono

Publikováno v: 1st Electronic Conference on Universe
1st Electronic Conference on Universe, Feb 2021, Basel, Switzerland. ⟨10.3390/ECU2021-09371⟩
Phys.Sc.Forum
1st Electronic Conference on Universe, Feb 2021, Basel, Switzerland. pp.45, ⟨10.3390/ECU2021-09371⟩

Upcoming full-sky large-scale structure surveys such as Euclid can probe the primordial Universe. Using the specifications for the Euclid survey, we estimate the constraints on the inflation potential beyond slow-roll. We use mock Euclid and Planck d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b2084f441b247cf93e2839dda8ff7eaf
http://arxiv.org/abs/2103.03291