Slow-roll inflation wikipedia

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Webb5 jan. 2024 · The ultra-slow-roll (USR) inflation represents a class of single-field models with sharp deceleration of the rolling dynamics on small scales, leading to a significantly … Webb22 okt. 2024 · Abstract: Slow-roll inflation is analyzed in the context of modified gravity within the Palatini formalism. As shown in the literature, inflation in this framework …

Inflation cosmology: slow-roll inflation versus tunneling

Webb1 nov. 2012 · Abstract: Ultra slow-roll inflation has recently been used to challenge the non-Gaussianity consistency relation. We show that this inflationary scenario belongs to … Webb5 apr. 2024 · The slow-roll conditions are conditions on the parameters and the initial conditions for the fields. Imposing also the number of e-folds, usually results in conditions on the parameters only. V=ge^ {-\lambda \phi } gives an exact solution for inflation, on … bitcoin mining financing

Analytic approach to non-slow-roll inflation - Physical Review …

WebbHiggs Inflation When , the potential is flat and slow roll inflation can occur. However it is found that we need to obtain the correct amplitude of density fluctuations. Potential in the Einstein frame. The allowed WMAP region for inflationary parameters spectral … Webb20 apr. 2016 · The slow roll approximation simplifies the equations of motion and guarantees that inflation will occur. However, as the text you have quoted states, it is also possible to have inflation without resorting to the slow roll approximation. Share Cite Improve this answer Follow edited Apr 20, 2016 at 16:42 answered Apr 19, 2016 at 18:36 WebbMed inflation menas vanligtvis att penningvärdet minskar. Den ursprungliga definitionen är "ökning av penningmängden [ 1] ". När penningmängden ökar kraftigt så minskar i regel penningvärdet. En effekt av inflation är att den allmänna prisnivån stiger, varför inflation ofta mäts med konsumentprisindex och uppfattas av många som ... das buch thoth

Phys. Rev. D 100, 063513 (2024) - Genericness of pre-inflationary ...

Quantum radiative corrections to slow-roll inflation-FlyAI

Webb11 mars 2024 · It then rolls very slowly along the potential. This is the slow-roll approximation and has been recognized as a practical way to realize inflation. In this … The basic model of inflation proceeds in three phases: • Expanding vacuum state with high potential energy • Phase transition to true vacuum • Slow roll and reheating das bunte hausboot fehmarnWebb10 dec. 2024 · Ultra-slow-roll (USR) inflation is a new mode of inflation which corresponds to the occasions when the inflaton field must traverse an extremely flat part of the scalar potential, when the usual slow-roll (SR) fails. We investigate USR and obtain an estimate for how long it lasts, given the initial kinetic density of the inflaton. bitcoin mining energy solutions

"Webb14 aug. 2015 · Large Slow Roll Parameters in Single Field Inflation. Jessica L. Cook, Lawrence M. Krauss. We initially consider two simple situations where inflationary slow roll parameters are large and modes no longer freeze out shortly after exiting the horizon, treating both cases analytically. We then consider applications to transient phases … " - Slow-roll inflation wikipedia

Slow-roll inflation wikipedia

WebbThe Boeing 787 Dreamliner is an American wide-body jet airliner developed and manufactured by Boeing Commercial Airplanes.After dropping its unconventional Sonic Cruiser project, Boeing announced the conventional 7E7 on January 29, 2003, which focused largely on efficiency. The program was launched on April 26, 2004, with an order … Webbslow-roll parameters, see, e.g., [13] for a detailed review. So far, various models achieve these aims by designing a short phase of inflationary nonattractor evolution. In one class of models, the first slow-roll parameter ϵ1 ¼ −H=H_ 2 remains small, while the absolute value of the second slow-roll parameter ϵ2 ¼ ϵ_1=ðHϵ1Þ is large ...

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Webb18 juli 2024 · Ultra-slow-roll (USR) inflation is a new mode of inflation which corresponds to the occasions when the inflaton field must traverse an extremely flat part of the scalar … Webb15 okt. 2013 · Slow-roll inflation is alive and well, unlike models which involve tunneling between two vacua. The model of inflation first proposed by Alan Guth back in 1980 was …

Webb4 dec. 2024 · An analytic approach to non-slow-roll inflation Gianmassimo Tasinato Brief periods of non-slow-roll evolution during inflation can produce interesting observable … Webb27 apr. 2024 · The inflationary potential for the constant slow-roll inflation is then reconstructed in the framework of both general relativity and scalar-tensor theory of gravity, and compared with the recently reconstructed E model potential. In the strong coupling limit, we show that the $\eta$ attractor is reached.

Webb4 aug. 1994 · The meaning of the inflationary slow-roll approximation is formalised. Comparisons are made between an approach based on the Hamilton-Jacobi equations, … It defines a realm like the one that contains the observable universe as only one of many inflationary zones. Astrophysicist Jean-Luc Lehners, of the Princeton Center for Theoretical Science, has argued that an inflationary universe does produce pockets. In his 2012 journal, Lehners wrote about how pocket universes can emerge as a result of eternal inflation. The mechanisms of inflation within …

Webb16 juli 2024 · Download PDF Abstract: A study of the slow-roll inflation for an exponential potential in the frame of the scalar-tensor theory is performed, where non-minimal kinetic coupling to curvature and non-minimal coupling of the scalar field to the Gauss-Bonnet invariant are considered. Different models were considered with couplings given by …

Webb8 dec. 2024 · In order to produce an accelerating expansion (desirable for inflation and dark energy models) using a scalar field, that field must be slowly rolling. The two slow-roll parameters are defined as ϵ = 1 κ 2 ( V, ϕ V) 2, η = V, ϕ ϕ κ 2 ϕ, where κ = 8 π G, ϕ is the scalar field and V its potential. bitcoin mining companies in south africaWebbIn new inflation, the slow-roll conditions must be satisfied for inflation to occur. The slow-roll conditions say that the inflaton potential must be flat (compared to the large vacuum … bitcoin mining farm kaufenWebbThe next generation of cosmological observations will be sensitive to small deviations from a pure power law in the primordial power spectrum of the curvature perturbations. In the context of slow-roll inflation, these… bitcoin mining facility in calvert city kyWebb13 sep. 2024 · Genericness of pre-inflationary dynamics and probability of the desired slow-roll inflation in modified loop quantum cosmologies Bao-Fei Li, Parampreet Singh, and Anzhong Wang Phys. Rev. D 100 , 063513 – Published 13 September 2024 das bundesarchiv memorial bookWebbCOVID-19 vaccination in Japan started later than in most other major economies. The country has frequently been regarded as "slow" in its vaccination efforts. Japan has so far approved Pfizer–BioNTech, Moderna and Oxford–AstraZeneca for use. In early October 2024, data from the government shows that 60.9% of people have had their second … das bunker night clubWebb12 apr. 2024 · Hence there is an N^2 enhancement with respect to the naive expectation, which is due to the infrared enhancement of scalar vacuum fluctuations characterising de Sitter space. Since observations constrain lambda to be very small lambda ~ 10^ (-12) and N ~ 50-60, the quantum corrections in this inflationary model are unobservably small. 文 … bitcoin mining extensionWebbSlow roll inﬂation Pascal Vaudrevange [email protected] October 26, 2010 1 What is inﬂation? Inﬂation is a period of accelerated expansion of the universe. … bitcoin mining ends