Frontiers of Inflationary Cosmology

Analogue Gravity

“…Models considered to date focus on variants of the BEC-inspired analogues:

Fedichev and Fischer [195, 194] have investigated WKB estimates of the cosmological particle production rate and (1+1) dimensional cosmologies, both in expanding BECs.

Lidsey [403], and Fedichev and Fischer [196] have focussed on the behaviour of cigar-like condensates in grossly-asymmetric traps.

Barceló et al [46, 47] have focussed on BECs and tried to mimic FLRW behaviour as closely as possible, both via free expansion, and via external control of the scattering length using a Feshbach resonance.

Fischer and Schützhold [206] propose the use of two-component BECs to simulate cosmic inflation.

Weinfurtner [674, 675] has concentrated on the approximate simulation of de Sitter spacetimes.

Weinfurtner, Jain, et al have undertaken both numerical [328] and general theoretical [677, 683] analyses of cosmological particle production in a BEC-based FLRW universe.

In all of these models the general expectations of the relativity community have been borne out — the theory definitely predicts particle production, and the very interesting question is the extent to which the formal predictions are going to be modified when working with real systems experimentally [47]. We expect that these analogue models provide us with new insights as to how their inherent modified-dispersion relations affect cosmological processes such as the generation of a primordial spectrum of perturbations (see, for example, [85, 84, 86, 87, 88, 89, 90, 122, 179, 269, 296, 297, 343, 380, 381, 406, 426, 423, 424, 425, 458, 459, 460, 487, 566, 587, 588, 589, 600] where analogue-like ideas are applied to cosmological inflation).…”

“…In all of these models the general expectations of the relativity community have been borne outthe theory definitely predicts particle production, and the very interesting question is the extent to which the formal predictions are going to be modified when working with real systems experimentally [47]. We expect that these analogue models provide us with new insights as to how their inherent modified-dispersion relations affect cosmological processes such as the generation of a primordial spectrum of perturbations (see, for example, [85,84,86,87,88,89,90,122,179,269,296,297,343,380,381,406,426,423,424,425,458,459,460,487,566,587,588,589,600] where analogue-like ideas are applied to cosmological inflation).…”

Analogue Gravity

“…We expect that these analogue models provide us with new insights as to how their inherent modified dispersion relations affect cosmological processes such as the generation of a primordial spectrum of perturbations (see for example [42, 41, 43, 44, 45, 46, 47, 70, 107, 158, 177, 178, 207], [229, 230, 244, 252, 249, 250, 251, 274, 275, 296, 349, 361, 362, 363, 371] where analogue-like ideas are applied to cosmological inflation).…”

Matter–antimatter asymmetry induced by a running vacuum coupling

“…Such disparate ingredients are needed in order to smoothly connect the early and late time accelerating regimes. Beyond the enigmatic CCP [7,8], there are also specific challenges for the cosmic concordance model: the initial singularity, the 'graceful' exit problem for some popular models of inflation, cosmic coincidence [9] (see also [10][11][12][13][14] for these and other potential problems).…”