Generalized Algebra Grounded on Nonadditive Entropies
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915996757917696 |
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| author | Dognini, Leandro Lyra Braga Tsallis, Constantino |
| author_facet | Dognini, Leandro Lyra Braga Tsallis, Constantino |
| contents | The class of $N$-body complex systems with total number of microscopic states given by $W(N) \sim ν^{N^γ}\;(ν>1, \,γ> 0)$ can be thermostatistically handled with the nonadditive entropic functional $S_δ(\{p_{i}\}) = k\sum_{i=1}^W p_i \Bigl(\ln \frac{1}{p_i} \Bigr)^δ\;(δ>0,\,S_1=S_{BG})$, $S_{BG}=k\sum_{i=1}^W p_i \ln \frac{1}{p_i}$ being the Boltzmann-Gibbs functional. Indeed, $S_{δ=1/γ}(\{1/W(N)\})=k[\ln W(N)]^{\frac{1}γ} \propto N$, as mandated by thermodynamics. Another wide class is that with $W(N) \sim N^ρ\;(ρ>0)$ and a generalized statistical mechanics grounded on the nonadditive entropic functional $S_q(\{p_{i}\})=k\sum_{i=1}^W p_i \ln_q \frac{1}{p_i} \;(q\in \mathbb{R},\;S_1=S_{BG})$, with $\ln_q z =\frac{z^{1-q}-1}{1-q}\; (z\geq0,\;q\in\mathbb{R},\;\ln_1 z=\ln z)$, satisfactorily handles such systems with $q=1-1/ρ$. Furthermore, for this class, the size of the corresponding admissible phase space is characterized by $\ln_q (x\otimes_q y) =\ln_q x + \ln_q y,\, x,y\geq1,\,q\leq 1$, and the $q$-product $x\otimes_q y=[x^{1-q}+y^{1-q}-1]^{\frac{1}{1-q}}_{+}\;(x\otimes_1 y=xy)$ also leads to the definition of a $q$-algebra. The entropic functional $S_{q,δ}(\{p_{i}\})=k\sum_{i=1}^W p_i \Bigl(\ln_q \frac{1}{p_i} \Bigr)^δ\;(q\in\mathbb{R},δ>0)$ unifies both cases above: $S_{q,1}=S_q$, $S_{1,δ}=S_δ$ and $S_{1,1}=S_{BG}$. In this paper, we generalize the $q$-algebra associated with $S_{q}$ to a new one associated with $S_{q,δ}$, namely the $(q,δ)$-algebra. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_13324 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generalized Algebra Grounded on Nonadditive Entropies Dognini, Leandro Lyra Braga Tsallis, Constantino Statistical Mechanics Mathematical Physics The class of $N$-body complex systems with total number of microscopic states given by $W(N) \sim ν^{N^γ}\;(ν>1, \,γ> 0)$ can be thermostatistically handled with the nonadditive entropic functional $S_δ(\{p_{i}\}) = k\sum_{i=1}^W p_i \Bigl(\ln \frac{1}{p_i} \Bigr)^δ\;(δ>0,\,S_1=S_{BG})$, $S_{BG}=k\sum_{i=1}^W p_i \ln \frac{1}{p_i}$ being the Boltzmann-Gibbs functional. Indeed, $S_{δ=1/γ}(\{1/W(N)\})=k[\ln W(N)]^{\frac{1}γ} \propto N$, as mandated by thermodynamics. Another wide class is that with $W(N) \sim N^ρ\;(ρ>0)$ and a generalized statistical mechanics grounded on the nonadditive entropic functional $S_q(\{p_{i}\})=k\sum_{i=1}^W p_i \ln_q \frac{1}{p_i} \;(q\in \mathbb{R},\;S_1=S_{BG})$, with $\ln_q z =\frac{z^{1-q}-1}{1-q}\; (z\geq0,\;q\in\mathbb{R},\;\ln_1 z=\ln z)$, satisfactorily handles such systems with $q=1-1/ρ$. Furthermore, for this class, the size of the corresponding admissible phase space is characterized by $\ln_q (x\otimes_q y) =\ln_q x + \ln_q y,\, x,y\geq1,\,q\leq 1$, and the $q$-product $x\otimes_q y=[x^{1-q}+y^{1-q}-1]^{\frac{1}{1-q}}_{+}\;(x\otimes_1 y=xy)$ also leads to the definition of a $q$-algebra. The entropic functional $S_{q,δ}(\{p_{i}\})=k\sum_{i=1}^W p_i \Bigl(\ln_q \frac{1}{p_i} \Bigr)^δ\;(q\in\mathbb{R},δ>0)$ unifies both cases above: $S_{q,1}=S_q$, $S_{1,δ}=S_δ$ and $S_{1,1}=S_{BG}$. In this paper, we generalize the $q$-algebra associated with $S_{q}$ to a new one associated with $S_{q,δ}$, namely the $(q,δ)$-algebra. |
| title | Generalized Algebra Grounded on Nonadditive Entropies |
| topic | Statistical Mechanics Mathematical Physics |
| url | https://arxiv.org/abs/2508.13324 |