Results 21 to 30 of about 38,508 (240)

Inflationary universe in loop quantum cosmology [PDF]

, 2007
Loop quantum cosmology provides a nice solution of avoiding the big bang singularity through a big bounce mechanism in the high energy region. In loop quantum cosmology an inflationary universe is emergent after the big bounce, no matter what matter ...
Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Bojowald M, Bojowald M, Cai Y f Li M z Lu J X Piao Y S Qiu T t Zhang X m, Cai Y F Qiu T Piao Y S Li M Zhang X, Domagala M, Huang Q G, Huang Q G, Meissner K A, Rovelli C, Sato K, Spergel D N, Starobinsky A A, Starobinsky A A, Thiemann T, Tsujikawa S, Vereshchagin G V, Wei H, Xin Zhang, Yi Ling, Zhang J F Zhang X Liu H Y, Zhang X, Zhang X   +25 more
core   +2 more sources

Editorial: Loop Quantum Cosmology

Frontiers in Astronomy and Space Sciences, 2022
3 pags. Editorial on the Research Topic 3 pags. This work was partially supported by Project No. MICINN PID2020-118159GB-C41 from Spain. BE acknowledges financial support from the Standard Program of JSPS Postdoctoral Fellowships for Research in Japan. FV acknowledges financial support from by the Canada Research Chairs Program, the
Beatriz Elizaga Navascués, Guillermo A. Mena Marugán, Francesca Vidotto, Francesca Vidotto   +3 more
doaj   +3 more sources

Homogeneous loop quantum cosmology [PDF]

Classical and Quantum Gravity, 2003
25 pages, 3 ...
Martin Bojowald
openalex   +7 more sources

Loop quantum gravity and cosmological constant

Physics Letters B, 2021
A one-parameter regularization freedom of the Hamiltonian constraint for loop quantum gravity is analyzed. The corresponding spatially flat, homogenous and isotropic model includes the two well-known models of loop quantum cosmology as special cases. The
Xiangdong Zhang, Gaoping Long, Yongge Ma
doaj   +4 more sources

Absence of a Singularity in Loop Quantum Cosmology [PDF]

Physical Review Letters, 2001
It is shown that the cosmological singularity in isotropic minisuperspaces is naturally removed by quantum geometry. Already at the kinematical level, this is indicated by the fact that the inverse scale factor is represented by a bounded operator even though the classical quantity diverges at the initial singularity.
Martin Bojowald
openalex   +5 more sources

Singularities in Loop Quantum Cosmology [PDF]

Physical Review Letters, 2008
5 pages, 3 figures. v2: Comments and references added.
Kevin Vandersloot, António Silva Cardoso, Thomas Cailleteau, Thomas Cailleteau, David Wands   +4 more
openaire   +6 more sources

Cosmic Tangle: Loop Quantum Cosmology and CMB Anomalies

Universe, 2021
Loop quantum cosmology is a conflicted field in which exuberant claims of observability coexist with serious objections against the conceptual and physical viability of its current formulations.
Martin Bojowald
doaj   +1 more source

Is a loopy and noncommutative early Universe viable?

Physics Letters B, 2023
We conduct a (pre-)inflationary dynamics study of the chaotic quadratic potential within the framework of a simple noncommutative extension of effective loop quantum cosmology put forward recently.
Luis Rey Díaz-Barrón, Abraham Espinoza-García, S. Pérez-Payán, J. Socorro   +3 more
doaj   +1 more source

Variational methods in loop quantum cosmology [PDF]

Europhysics Letters (EPL), 2006
An action functional for the loop quantum cosmology difference equation is presented. It is shown that by guessing the general form of the solution and optimizing the action functional with respect to the parameters in the guessed solution one can obtain approximate solutions which are reasonably good.
Fatimah Shojai, Ali Shojai
openalex   +6 more sources

Tachyon field in loop cosmology

Physics Letters B, 2020
The evolutionary pictures of tachyon field in modified loop cosmology have been investigated. We present the dynamical behavior of the tachyon field associated with an exponential potential and find that the pre-inflation dynamics are very similar in ...
Kui Xiao
doaj   +1 more source