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首页量子引力的维度与模糊性:新理论揭示时空印记
本文探讨了量子引力在时空维度和结构中的深刻关联,特别是通过两个关键概念:维数流和时空模糊性。作者们在多重分数理论(Multifractal Theory)的框架下进行研究,这个理论的核心假说是在高能(紫外光谱)下,时空维度会呈现异常缩放,而在低能(红外光谱)下,维度的变化则更为平滑。多重分数理论的特点在于其能够解释尺度相关的形态变化,这种变化是构建出包含模糊时空结构的积分度量的关键因素。 文章将多重分数理论中的长度尺度修正与量子力学和广义相对论中的普朗克不确定性原理进行了对比,这种不确定性通常表现为长度、时间和空间测量的模糊性。通过这种方法,作者能够约束理论中的两个自由参数,并在特定情况下确定了紫外维的数量,这一结果与先前的量子重力分析相一致。这些发现对于理解基本物理规律在极端尺度下的行为具有重要意义。 进一步的研究揭示,这种模糊性可能源于微观尺度上的基本离散不变性,它暗示着随机的时空几何形状。作者通过形式化的数学处理,将这种模糊性与微观世界的深层次结构联系起来,这对于构建一个统一的量子引力理论具有理论基础的支持。 总结来说,这篇论文不仅深化了我们对量子引力的理解,而且展示了如何通过多重分数理论来揭示时空维度和结构的内在联系。它为量子引力的未来发展提供了一个新的视角,尤其是在维度流动性和时空模糊性这两个关键问题上,为解决宇宙基本定律在极小尺度上的冲突提供了可能。
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Physics Letters B 774 (2017) 630–634
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
Imprint of quantum gravity in the dimension and fabric of spacetime
Giovanni Amelino-Camelia
a,b
, Gianluca Calcagni
c,∗
, Michele Ronco
a,b
a
Dipartimento di Fisica, Università di Roma “La Sapienza”, P.le A. Moro 2, 00185 Roma, Italy
b
INFN, Sez. Roma1, P.le A. Moro 2, 00185 Roma, Italy
c
Instituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid, Spain
a r t i c l e i n f o a b s t r a c t
Article history:
Received
6 September 2017
Received
in revised form 11 October 2017
Accepted
13 October 2017
Available
online 18 October 2017
Editor:
M. Cveti
ˇ
c
We here conjecture that two much-studied aspects of quantum gravity, dimensional flow and spacetime
fuzziness, might be deeply connected. We illustrate the mechanism, providing first evidence in support of
our conjecture, by working within the framework of multifractional theories, whose key assumption is an
anomalous scaling of the spacetime dimension in the ultraviolet and a slow change of the dimension in
the infrared. This sole ingredient is enough to produce a scale-dependent deformation of the integration
measure with also a fuzzy spacetime structure. We also compare the multifractional correction to lengths
with the types of Planckian uncertainty for distance and time measurements that was reported in
studies combining quantum mechanics and general relativity heuristically. This allows us to fix two free
parameters of the theory and leads, in one of the scenarios we contemplate, to a value of the ultraviolet
dimension which had already found support in other quantum-gravity analyses. We also formalize a
picture such that fuzziness originates from a fundamental discrete scale invariance at short scales and
corresponds to a stochastic spacetime geometry.
© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
1. Introduction and main goal
The landscape of quantum gravity (QG) looks like a varie-
gated
compound of approaches that start from different concep-
tual
premises and use different mathematical formalisms (see, e.g.,
Refs. [1–21]). Rather surprisingly, despite this heterogeneity, over
the past few years a generic prediction has emerged: dimensional
flow [22–39], i.e., a change of spacetime dimension with the scale
of the observer. In all QG models, the dimensionality of spacetime
exhibits a dependence on the scale, changing (or “flowing”) from
the topological dimension D in the infrared (IR) to a different value
in the ultraviolet (UV). So far, there has been no deep explanation
for this universal property. Understanding its origin is just as im-
portant
as looking for its physical characterization, needed to relate
the flow of dimensions to physical observables.
We here put forward and motivate the conjecture that dimen-
sional
flow is directly related to the presence of limitations on the
measurability of distances close to the Planck length
Pl
=
G
¯
h/c
3
,
a feature (spacetime fuzziness) which has been of interest for QG
research for decades [40–47]. More precisely, we shall provide pre-
*
Corresponding author.
E-mail
addresses: giovanni.amelino-camelia@roma1.infn.it (G. Amelino-Camelia),
calcagni@iem.cfmac.csic.es (G. Calcagni), michele.ronco@roma1.infn.it (M. Ronco).
liminary “theoretical evidence” in support of a connection between
the number of spacetime dimensions in the UV and the form of
the uncertainty on spacetime distances. Important from our per-
spective
is the fact that such a connection might set the stage for
a role for dimensional flow in QG phenomenology [48]. Indeed, it
has been shown that, in some cases, spacetime fuzziness could be
investigated in ongoing and forthcoming experiments, even if the
fuzziness is introduced at the Planck scale. This was first explored
in analyses of the interferometers used for gravity-wave searches
[48–50], and more recently is focusing mainly on the implications
of fuzziness for the formation of halo structures in the images of
distant quasars [48,51].
2. Example: multifractional theories
We provide preliminary support for our conjecture within the
context of multifractional theories [25,52] fully reviewed in [53].
These are a class of field theories of matter and gravity where
spacetime is “anomalous” and changes properties with the probed
scale, in a way similar to a multifractal. While in other quantum
gravities dimensional flow is a derived property not required a pri-
ori,
here it is part of the definition of the framework. Thanks to
their peculiar properties, these field theories living on a multifrac-
tal
spacetime reproduce a wealth of phenomena found in QG. In
https://doi.org/10.1016/j.physletb.2017.10.032
0370-2693/
© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.
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