Zobrazeno 1 - 10
of 532
pro vyhledávání: '"Immirzi parameter"'
Autor:
Rakshit P. Vyas, Mihir J. Joshi
Publikováno v:
Physics, Vol 4, Iss 4, Pp 1094-1116 (2022)
The Barbero–Immirzi parameter, (γ), is introduced in loop quantum gravity (LQG), whose physical significance is still the biggest open question because of its profound traits. In some cases, it is real valued, while it is complex valued in other c
Externí odkaz:
https://doaj.org/article/8f6223fd5fdf4f41872f46de841c80ac
Autor:
Everton M.C. Abreu, Jorge Ananias Neto
Publikováno v:
Physics Letters B, Vol 807, Iss , Pp 135602- (2020)
Using the Boltzmann-Gibbs statistical mechanics together with the quasinormal modes of the black holes and the Bekenstein-Hawking area entropy law, we can determine univocally the lowest possible value for the spin j, which is jmin=1, in the framewor
Externí odkaz:
https://doaj.org/article/c146ba532e9b4284aa13cc860bd1b5fd
Counting the Microstates at the Black Hole Horizon and the Immirzi Parameter of Loop Quantum Gravity
Autor:
Muhammad Sadiq
Publikováno v:
Journal of Applied Mathematics and Physics. :2055-2062
Motivated by Bekenstein’s original thought that led him to his famous area-entropy formula for a black hole and by our recent study regarding the black hole dynamics, we identify the appropriate microscopic degrees of freedom in loop quantum gravit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e737186c5af5098d9d6e671629fc864
https://doi.org/10.4236/jamp.2020.810153
https://doi.org/10.4236/jamp.2020.810153
The graphical calculus method is generalized to study the relation between covariant and canonical dynamics of loop quantum gravity. On one hand, a graphical derivation of the partition function of the generalized Euclidean Engle-Pereira-Rovelli-Livi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b048ff66f78b703e8358130d91c157d4
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
instname
e-Archivo. Repositorio Institucional de la Universidad Carlos III de Madrid
e-Archivo: Repositorio Institucional de la Universidad Carlos III de Madrid
Universidad Carlos III de Madrid (UC3M)
instname
e-Archivo. Repositorio Institucional de la Universidad Carlos III de Madrid
e-Archivo: Repositorio Institucional de la Universidad Carlos III de Madrid
Universidad Carlos III de Madrid (UC3M)
5 pags.
We discuss a simple symplectic formulation for tetrad gravity that leads to the real Ashtekar variables in a direct and transparent way. It also sheds light on the role of the Immirzi parameter and the time gauge.
This work has been
We discuss a simple symplectic formulation for tetrad gravity that leads to the real Ashtekar variables in a direct and transparent way. It also sheds light on the role of the Immirzi parameter and the time gauge.
This work has been
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::272cc16a642e660a7601f9bc1eca2e77
http://hdl.handle.net/10261/259664
http://hdl.handle.net/10261/259664
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
instname
instname
We extend the notion of the Nieh-Yan invariant to generic metric-affine geometries, where both torsion and nonmetricity are taken into account. Notably, we show that the properties of projective invariance and topologicity can be independently accomm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::baa406688c9905b938ffde47b83c6b09
http://hdl.handle.net/10261/265847
http://hdl.handle.net/10261/265847
Publikováno v:
Phys.Rev.D
Phys.Rev.D, 2021, 104 (12), pp.126008. ⟨10.1103/PhysRevD.104.126008⟩
Phys.Rev.D, 2021, 104 (12), pp.126008. ⟨10.1103/PhysRevD.104.126008⟩
International audience; Models of spin foam quantum gravity come in different spacetime signatures, either Euclidean or Lorentzian. The choice is reflected in the use of Spin(4) or SL(2,C) as gauge groups for the holonomies of the connection. In this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11a033ccf5e79b8e270b4e95c8cc1751
https://hal.science/hal-03284601
https://hal.science/hal-03284601
Autor:
Francesco Cianfrani
Publikováno v:
Class.Quant.Grav.
Class.Quant.Grav., 2021, 38 (24), pp.245002. ⟨10.1088/1361-6382/ac33bd⟩
Class.Quant.Grav., 2021, 38 (24), pp.245002. ⟨10.1088/1361-6382/ac33bd⟩
A manifestly Lorentz-covariant formulation of Loop Quantum Gravity (LQG) is given in terms of finite-dimensional representations of the Lorentz group. The formulation accounts for discrete symmetries, such as parity and time-reversal, and it establis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5adab5906c970c1e55e7dee49b85e8ef
https://hal.archives-ouvertes.fr/hal-03171406
https://hal.archives-ouvertes.fr/hal-03171406
Publikováno v:
Phys.Rev.D
Phys.Rev.D, 2022, 105 (10), pp.106018. ⟨10.1103/PhysRevD.105.106018⟩
Phys.Rev.D, 2022, 105 (10), pp.106018. ⟨10.1103/PhysRevD.105.106018⟩
We study numerically the first order radiative corrections to the self-energy, in covariant loop quantum gravity. We employ the recently developed 'sl2cfoam-next' spinfoam amplitudes library, and some original numerical methods. We analyze the scalin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::97f0cd80ff813f716085fb57427056ab
Autor:
Shupeng Song, Yongge Ma
Publikováno v:
European Physical Journal
European Physical Journal C: Particles and Fields, Vol 80, Iss 7, Pp 1-7 (2020)
European Physical Journal C: Particles and Fields, Vol 80, Iss 7, Pp 1-7 (2020)
Based on the first-order action for scalar-tensor theories with the Immirzi parameter, the symplectic form for the spacetimes admitting a weakly isolated horizon as internal boundary is derived by the covariant phase space approach. The first law of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66953b9d358c3ee8c496ba9504e572bf
http://arxiv.org/abs/2007.02516
http://arxiv.org/abs/2007.02516