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Born-Oppenheimer EFT: a unified description of ordinary and exotic quarkonia
Antonio Vairo
https://arxiv.org/abs/2509.13043 https://arxiv.org/pdf/2509.1304…

Born-Oppenheimer EFT: a unified description of ordinary and exotic quarkonia
We show how the Born-Oppenheimer effective field theory (BOEFT) provides a unified description of ordinary and exotic quarkonia grounded on the non-relativistic expansions of QCD and supplemented with lattice QCD inputs. We apply BOEFT to tetraquarks, pentaquarks, quarkonium hybrids and to assess threshold effects in the quarkonium spectrum.

Šita nuomonė LRT mane įtikino: https://www.lrt.lt/naujienos/nuomones/3/2709205/gediminas-karoblis-matematine-barbaryste

Localizing entanglement in high-dimensional states
Christopher Vairogs, Akanksha Chablani, Leo Lee, Hanyang Sha, Abigail Vaughan-Lee, Jacob L. Beckey
https://arxiv.org/abs/2510.08501

Localizing entanglement in high-dimensional states
In this work, we study the asymptotic behavior of protocols that localize entanglement in large multi-qubit states onto a subset of qubits by measuring the remaining qubits. We use the maximal average n-tangle that can be generated on a fixed subsystem by measuring its complement -- either with local or global measurements -- as our key figure of merit. These quantities are known respectively as the localizable entanglement (LE) and the entanglement of assistance (EA). We build upon the work of…

On Brezis-Nirenberg problems: open questions and new results in dimension six
Fengliu Li, Giusi Vaira, Juncheng Wei, Yuanze Wu
https://arxiv.org/abs/2509.19863 https://

On Brezis-Nirenberg problems: open questions and new results in dimension six
In this paper, we consider the Brezis-Nirenberg problem \begin{equation*} \left\{\begin{aligned} &-Δu = λu+|u|^{2^*-2}u, \quad &\mbox{in}\,Ω,\\ &u=0,\quad &\mbox{on}\, \partialΩ, \end{aligned}\right. \end{equation*} where $Ω$ is a smoothly bounded domain of $\mathbb R^N$ with $N\geq 3$, $λ>0$ is a parameter and $2^*=\frac{2N}{N-2}$ is the critical Sobolev exponent. We first recall the history of the Brezis-Nirenberg problem and then provide new results of it in dimension six. Fi…

Fall Color Scene by the Pond in the Arboretum
#photo #photography #trees #fall

Thermalization of Bottomonium in the Quark-Gluon Plasma
Nora Brambilla, Tom Magorsch, Antonio Vairo
https://arxiv.org/abs/2508.11743 https://arxiv.org/pdf/…

Thermalization of Bottomonium in the Quark-Gluon Plasma
We study the approach to equilibrium of bottomonium in the quark-gluon plasma within the open quantum system framework. We perform large-scale simulations of the long-time behavior in three dimensions using the quantum trajectory method to observe the emergence of steady states and determine the timescale of thermalization in position-, angular-momentum-, and color-space. We find that the thermalization timescale increases with decreasing temperature and decreasing coupling to the medium, which…

Unravelling Pentaquarks with Born--Oppenheimer effective theory
Nora Brambilla, Abhishek Mohapatra, Antonio Vairo
https://arxiv.org/abs/2508.13050 https://…

Unravelling Pentaquarks with Born--Oppenheimer effective theory
The hidden-charm pentaquark states $P_{c\bar{c}}\left(4312\right)^+$, $P_{c\bar{c}}\left(4380\right)^+$, $P_{c\bar{c}}\left(4440\right)^+$, and $P_{c\bar{c}}\left(4457\right)^+$, all with isospin $I = 1/2$, were discovered by the LHCb collaboration in the decay process $Λ_b^0 \to J/ψp K^-$. Although their quantum numbers remain undetermined, these states have generated significant theoretical interest. We analyze their spectrum and decay patterns-including those of their spin partners-within …