Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Qu, Dongxue"'
Simplicial approaches to quantum gravity such as Quantum Regge Calculus and Spin Foams include configurations where bulk edges can become arbitrarily large while keeping the lengths of the boundary edges small. Such configurations pose significant ch
Externí odkaz:
http://arxiv.org/abs/2406.19169
This work develops a comprehensive algorithm and a Mathematica program to construct boundary data and compute real and complex critical points in spinfoam amplitudes. Our approach covers both spacelike tetrahedra and triangles in the EPRL model and t
Externí odkaz:
http://arxiv.org/abs/2404.10563
It has been conjectured that quantum gravity effects may cause the black-to-white hole transition due to quantum tunneling. The transition amplitude of this process is explored within the framework of the spin foam model on a 2-complex containing 56
Externí odkaz:
http://arxiv.org/abs/2404.02796
We study homogenous and isotropic quantum cosmology using the spinfoam formalism of Loop Quantum Gravity (LQG). We define a coupling of a scalar field to the 4-dimensional Lorentzian Engle-Pereira-Rovelli-Livine (EPRL) spinfoam model. We employ the n
Externí odkaz:
http://arxiv.org/abs/2402.07984
The complex critical points are analyzed in the 4-dimensional Lorentzian Engle-Pereira-Rovelli-Livine (EPRL) spinfoam model in the large-$j$ regime. For the 4-simplex amplitude, taking into account the complex critical point generalizes the large-$j$
Externí odkaz:
http://arxiv.org/abs/2301.02930
Autor:
van der Meer, Reinier, Huang, Zichang, Anguita, Malaquias Correa, Qu, Dongxue, Hooijschuur, Peter, Liu, Hongguang, Han, Muxin, Renema, Jelmer J., Cohen, Lior
The unification of general relativity and quantum theory is one of the fascinating problems of modern physics. One leading solution is Loop Quantum Gravity (LQG). Simulating LQG may be important for providing predictions which can then be tested expe
Externí odkaz:
http://arxiv.org/abs/2207.00557
Publikováno v:
Phys. Rev. D 106, 044005 (2022)
This paper focuses on the semiclassical behavior of the spinfoam quantum gravity in 4 dimensions. There has been long-standing confusion, known as the flatness problem, about whether the curved geometry exists in the semiclassical regime of the spinf
Externí odkaz:
http://arxiv.org/abs/2110.10670
Publikováno v:
Phys. Rev. D 103, 084026 (2021)
We compute numerically the Lorentzian Engle-Pereira-Rovelli-Livine (EPRL) spinfoam propagator on a 4-simplex, by adapting the methods of Lefschetz thimble and Markov Chain Monte-Carlo to oscillatory spinfoam integrals. Our method can compute any spin
Externí odkaz:
http://arxiv.org/abs/2012.11515
Publikováno v:
Phys. Rev. D 102, 124010 (2020)
We numerically study the next-to-leading order corrections of the Lorentzian Engle-Pereira-Rovelli-Livine (EPRL) 4-simplex amplitude in the large-$j$ expansions. We perform large-$j$ expansions of Lorentzian EPRL 4-simplex amplitudes with two differe
Externí odkaz:
http://arxiv.org/abs/2007.01998
Autor:
Cohen, Lior, Brady, Anthony J., Huang, Zichang, Liu, Hongguang, Qu, Dongxue, Dowling, Jonathan P., Han, Muxin
Publikováno v:
Phys. Rev. Lett. 126, 020501 (2021)
The problem of simulating complex quantum processes on classical computers gave rise to the field of quantum simulations. Quantum simulators solve problems, such as Boson sampling, where classical counterparts fail. In another field of physics, the u
Externí odkaz:
http://arxiv.org/abs/2003.03414