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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Global stability of the Minkowski spacetime for the Einstein-Vlasov system
爱因斯坦-弗拉索夫系统 闵可夫斯基时空 全球稳定性
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2023/4/21
In this talk, we discuss the global stability of the Minkowski spacetime in the wave coordinates system for the massive Einstein-Vlasov system. In particular, compared with previous results by Lindbla...
The School on String Theory, Quantum Field Theory and Geometry of Spacetime
Quantum Field Theory and Geometry Geometry of Spacetime
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2016/7/19
The School on String Theory, Quantum Field Theory and Geometry of Spacetime will take place at Tsinghua University, Beijing, China, from July 24 to July 28, 2016, the week before Strings 2016. Topics ...
Raiders of the lost spacetime
quantum gravity problem of time quantum GR loop quantum gravity emergence of spacetime
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2016/6/15
Spacetime as we know and love it is lost in most approaches to quantum gravity. For many of these approaches, as inchoate and incomplete as they may be, one of the main challenges is to relate what th...
The emergence of spacetime in quantum theories of gravity
spacetime quantum gravity emergence
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2016/6/13
This is the introduction to the special issue of Studies in the History and Philosophy of Modern Physics on the emergence of spacetime in quantum theories of spacetime.
Homogeneity of spacetime implies the free Schrodinger equation
Schrö dinger equation spacetime homogeneity spacetime translation invariance Klein-Gordon equation
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2016/6/13
The free Schrodinger equation is shown to be a consequence of spacetime homogeneity in the non-relativistic domain. This may help understand the origin of the wave equations in quantum theory.
Three possible implications of spacetime discreteness
spacetime discreteness Planck scale, speed of light gravity wavefunction collapse quantum gravity
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2016/6/13
We analyze the possible implications of the discreteness of spacetime, which is defined here as the existence of a minimum observable interval of spacetime. First, it is argued that the discreteness o...
Inertial motion,explanation,and the foundations of classical spacetime theories
Inertial motion geodesic principle general relativity Newton-Cartan theory geometrized Newtonian gravitation explanation puzzle-ball view
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2016/5/31
I begin by reviewing some recent work on the status of the geodesic principle in general relativity and the geometrized formulation of Newtonian gravitation. I then turn to the question of whether eit...
Was Leibniz the First Spacetime Structuralist?
Leibniz Clarke Leibniz-Clarke Correspondence Belot space spacetime structuralism relationism modal relationism substantivalism structural realism ontic structural realism
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2016/5/31
I argue that the standard interpretation of Leibniz as a relationist about space is mistaken, and defend a reading according to which his correspondence with Samuel Clarke actually suggests that Leibn...
Spacetime and Reality:Facing the Ultimate Judge
Minkowski absolute world spacetime relativity of simultaneity length contraction
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2016/5/31
Over a hundred years ago in his paper "Space and Time" Hermann Minkowski demonstrated the profound meaning of the relativity postulate - the experimental fact that physical phenomena are the same in a...
Substantivalist and Relationalist Approaches to Spacetime
substantivalism relationalism spacetime
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2016/5/31
Substantivalists believe that spacetime and its parts are fundamental constituents of reality. Relationalists deny this, claiming that spacetime enjoys only a derivative existence. I begin by describi...
A dilemma for the emergence of spacetime in canonical quantum gravity
spacetime emergence quantum geometrodynamics loop quantum gravity quantum superposition quantum entanglement non-separability structural realism local beables
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2016/5/30
The procedures of canonical quantization of the gravitational field apparently lead to entities for which any interpretation in terms of spatio-temporal localization or spatio-temporal extension seems...
Emergent spacetime and empirical (in) coherence
spacetime quantum gravity empirical incoherence causal set theory loop quantum gravity string theory non-commutative geometry
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2016/5/30
Numerous approaches to a quantum theory of gravity posit fundamental ontologies that exclude spacetime, either partially or wholly. This situation raises deep questions about how such theories could r...
Similarity Assessments,Spacetime,and the Gravitational Field:What Does the Metric Tensor Represent in General Relativity?
general relativity metric tensor similarity-based reasoning
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2016/5/30
In this paper I explore the dialectics underlying the choice between a geometrical and a field interpretation of the metric tensor gab in general relativity. My aim is to examine the role of a specifi...
EXTRACTION OF FEATURES FROM OBJECTS IN URBAN AREAS USING SPACETIME ANALYSIS OF RECORDED LASER PULSES
Urban Analysis Simulation Laser scanning LIDAR Measurement Feature
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2015/6/1
In this paper we describe a simulation system and investigations for analysis of recorded laser pulses. A simulation setup that considers simulated signals of synthetic objects was developed for explo...
Recombinant selves in mass mediated spacetime
Mass media Subjectivity Social relations Chronotopes Public sphere
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2015/2/3
Bakhtin proposed that novelistic ‘‘chronotopes’’ (depictions of place-time-and-personhood) implicitly frame readers’ acts of construing a novel’s plot and explicit content in ways that potentially tra...