Caby, Théophile

In a universe of arbitrary spacetime geometry, we introduce a referential centered at the observer that constitutes a consistent representation of its environment and in which he performs measurements. We postulate some natural rules applying in this representation referential, that match our everyday experience of the physical world. We show that ...

Morán, José Fosset, Antoine Benzaquen, Michael Bouchaud, Jean-Philippe

We show how the approach to equilibrium in Kirman's ants model can be fully characterized in terms of the spectrum of a Schrödinger equation with a Pöschl-Teller (tan 2) potential. Among other interesting properties, we have found that in the bimodal phase where ants visit mostly one food site at a time, the switch time between the two sources only...

Morán, José Fosset, Antoine Luzzati, Davide Bouchaud, Jean-Philippe Benzaquen, Michael

Historically, rational choice theory has focused on the utility maximization principle to describe how individuals make choices. In reality, there is a computational cost related to exploring the universe of available choices and it is often not clear whether we are truly maximizing an underlying utility function. In particular, memory e↵ects and h...

Bonnefoy, Quentin Dudas, Emilian Lust, Severin

We study the weak gravity conjecture in non-supersymmetric string theory setups. Precisely, those are type I string theory with supersymmetry broken \`a la Scherk-Schwarz and open strings on D branes wrapped around magnetized tori in type II string theory. We compute long-range interactions between identical branes at one-loop and compare them to t...

Mao, Lingling Guo, Peijun Kepenekian, Mikael Spanopoulos, Ioannis He, Yihui Katan, Claudine Even, Jacky Schaller, Richard Seshadri, Ram Stoumpos, Constantinos
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Hybrid layered halide perovskites have achieved impressive performance in optoelectronics. New structural types in the two-dimensional (2D) halide system such as the Dion-Jacobson phases have attracted wide research attention due to the short interlayer distance and unique layer orientation that facilitate better charge-transport and higher stabili...

Ye, Jiachen Hu, Qitong Ji, Peng Barthelemy, Marc

Understanding how interurban movements can modify the spatial distribution of the population is important for transport planning but is also a fundamental ingredient for epidemic modeling. We focus here on vacation trips (for all transportation modes) during the Chinese Lunar New Year and compare the results for 2019 with the ones for 2020 where tr...

Barthelemy, Marc

Scaling describes how a given quantity $Y$ that characterizes a system varies with its size $P$. For most complex systems it is of the form $Y$ $\sim$ $P^ \beta$ with a nontrivial value of the exponent $\beta$, usually determined by regression methods. The presence of noise can make it difficult to conclude about the existence of a non-linear behav...

Volpati, Valerio Barthelemy, Marc

The coupling between population growth and transport accessibility has been an elusive problem for more than 60 years now. Due to the lack of theoretical foundations, most of the studies that considered how the evolution of transportation networks impacts the population growth are based on regression analysis in order to identify relevant variables...

Volpati, Valerio Barthelemy, Marc

Although the average population density of a city is an extremely simple indicator, it is often used as a determinant factor for describing various aspects of urban phenomena. On the other hand, a plethora of different measures that aim at characterizing the urban form have been introduced in the literature, often with the risk of redundancy. Here,...

Sabbagh, Omid Fanaei, Mohammad Ali Arjomand, Alireza
Published in
Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles

Natural gas is the fastest-growing fossil fuel and LNG is playing a growing role in the world’s gas supply. The liquefaction process is also by far the most energy-consuming part of the LNG chain. It is thus a priority today for the gas industry to decrease the cost and improve the efficiency of the liquefaction process of a plant. In this way, a n...