Tootfinder

DNA Unzipping Transition
Somendra M. Bhattacharjee
https://arxiv.org/abs/2506.24064 https://arxiv.org/pdf/2506.24064

DNA Unzipping Transition
This review focuses on the force-induced unzipping transition of double-stranded DNA. It begins with a brief history of DNA melting, which emerged alongside the growth of the field of molecular biology, juxtaposed with the advancements in physics during the same post-World War II period. The earlier theories of melting of DNA were based on the Ising model and its modifications, but gradually moved towards polymer-based models. The idea of force-induced unzipping was first introduced in 1999 as …

Return of the clocked burster GS~1826$-$238
Tomoshi Takeda, Toru Tamagawa, Teruaki Enoto, Wataru Iwakiri, Akira Dohi, Tatehiro Mihara, Hiromitsu Takahashi, Chin-Ping Hu, Amira Aoyama, Naoyuki Ota, Satoko Iwata, Takuya Takahashi, Kaede Yamasaki, Takayuki Kita, Soma Tsuchiya, Yosuke Nakano, Mayu Ichibakase, Nobuya Nishimura
https://arxiv.org…

Return of the clocked burster GS~1826$-$238
We report the discovery of an exceptionally short burst recurrence time in the well-known clocked burster GS~1826$-$238, observed with the CubeSat X-ray observatory NinjaSat. The source had remained in a persistent soft spectral state since its hard-to-soft transition in 2015 July until a soft-to-hard transition occurred in 2025 May. On 2025 June 23, NinjaSat began monitoring GS~1826$-$238 in the hard state and continued until the source returned to a steady soft state. During this period, we d…

Officially, I came along towards the end of Gen X. So far as I can tell, one of the main differences between myself and my generational elders is that while I, like them, learned to type (on a typewriter!) with a double space after every period, I got over it when we all made the transition to word processors.

Thermal Radiation from an Analytic Hydrodynamic Model with Hadronic and QGP Sources in Heavy-Ion Collisions
G\'abor L\'aszl\'o Kasza
https://arxiv.org/abs/2507.13240

Thermal Radiation from an Analytic Hydrodynamic Model with Hadronic and QGP Sources in Heavy-Ion Collisions
In high-energy heavy-ion collisions, a nearly perfect fluid is formed, known as the strongly coupled quark-gluon plasma (QGP). After a short thermalization period, the evolution of this medium can be described by the equations of relativistic hydrodynamics. As the system expands and cools, the QGP undergoes a transition into hadronic matter, marking the onset of quark confinement. Direct photons offer insights into an essential stage of evolution, spanning from the onset of thermalization to th…

On the estimation of solar wind velocity under varying solar activity conditions using Akatsuki measurements
Keshav Aggarwal, R. K. Choudhary, Abhirup Datta, Takeshi Imamura
https://arxiv.org/abs/2508.06381

On the estimation of solar wind velocity under varying solar activity conditions using Akatsuki measurements
We present an analysis of solar wind dynamics based on Doppler spectral width measurements of X-band radio signals from the Japanese Akatsuki spacecraft. The dataset includes two solar conjunction occultation experiments conducted in 2016 and 2022, capturing the transition from the descending phase of Solar Cycle 24, a period of low solar activity, to the ascending phase of Solar Cycle 25, which exhibited moderate to intense activity. Our study demonstrates the utility of this technique for est…