9,856 research outputs found
On Braided Linear Gr-categories
We provide explicit and unified formulae for the normalized 3-cocycles on
arbitrary finite abelian groups. As an application, we compute all the braided
monoidal structures on linear Gr-categories.Comment: 14 pages; typos correcte
Graded elementary quasi-Hopf algebras of tame representation type
The class of graded elementary quasi-Hopf algebras of tame type is
classified. Combining with our previous work [19], this completes the
trichotomy for such class of algebras according to their representation types.
In addition, new examples of genuine elementary quasi-Hopf algebras, and
accordingly finite pointed tensor categories, are provided.Comment: 20 page
Evolution of cooperation in spatial traveler's dilemma game
Traveler's dilemma (TD) is one of social dilemmas which has been well studied
in the economics community, but it is attracted little attention in the physics
community. The TD game is a two-person game. Each player can select an integer
value between and () as a pure strategy. If both of them select
the same value, the payoff to them will be that value. If the players select
different values, say and (), then the payoff to the
player who chooses the small value will be and the payoff to the other
player will be . We term the player who selects a large value as the
cooperator, and the one who chooses a small value as the defector. The reason
is that if both of them select large values, it will result in a large total
payoff. The Nash equilibrium of the TD game is to choose the smallest value
. However, in previous behavioral studies, players in TD game typically
select values that are much larger than , and the average selected value
exhibits an inverse relationship with . To explain such anomalous behavior,
in this paper, we study the evolution of cooperation in spatial traveler's
dilemma game where the players are located on a square lattice and each player
plays TD games with his neighbors. Players in our model can adopt their
neighbors' strategies following two standard models of spatial game dynamics.
Monte-Carlo simulation is applied to our model, and the results show that the
cooperation level of the system, which is proportional to the average value of
the strategies, decreases with increasing until is greater than the
threshold where cooperation vanishes. Our findings indicate that spatial
reciprocity promotes the evolution of cooperation in TD game and the spatial TD
game model can interpret the anomalous behavior observed in previous behavioral
experiments
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