# NP3M Seminars (Virtual), Spring 2024

All talks are on an NP3M zoom channel on Thursdays at 11am EDT

**Jan. 18th, Aviral Prakash, Penn State Univ.**(video)**Feb. 15th, Yuki Fujimoto, INT, Univ. Washington****Feb. 29th, Damiano Fiorillo, Niels Bohr Inst.****Mar. 28th, Kyle Godbey, FRIB****Apr. 11th, Prasanta Char, Univ. of Salamanca****Apr. 25th, Joachim Kopp, Univ. of Mainz and CERN****May 9th, Witek Nazarewicz, Michigan State Univ.**

Title: What can we learn about baryon-rich QCD matter from the lattice data at finite isospin density?

Abstract: Determining the equation of state (EoS) of QCD matter at high baryon density from first principles is a vital challenge in modern nuclear theory because of its non-perturbative nature. The most promising non-perturbative approach is lattice QCD, but it does not work at high baryon density due to the sign problem. However, there is a well-known exception to avoid the sign problem by taking opposite up and down quark chemicals; it is referred to as QCD at finite isospin chemical potential.

In this talk, I explain two consequences drawn from the recent lattice QCD calculations at finite isospin chemical potential. First, I describe the uses of QCD inequalities and input from the finite isospin density lattice data to derive robust bounds on the EoS at finite baryon density. We find that the lattice data puts an upper bound on the baryon density of the symmetric nuclear matter at a given baryon chemical potential and a lower bound on the pressure as a function of the energy density. In the second part of the talk, the weak-coupling results in dense QCD are confronted with the lattice data. Particularly, we verify that the weak-coupling calculation of the Cooper pairing gap among quarks can be applicable down to the quark chemical potential \( \mu \sim 1~\mathrm{GeV} \). This implies that the color-superconducting gap should be \( \sim 1-10~\mathrm{MeV} \) at \( \mu = 1~\mathrm{GeV} \).

Title: Neutrinos from Neutron Stars

# NP3M Seminars (Virtual), Spring 2024

All talks are on an NP3M zoom channel on Thursdays at 3pm EDT

**Aug. 24th, Cecilia Chirenti, Univ. Maryland**(slides, video)**Sept. 7th, Evan O'Connor, Stockholm Univ.**(slides)**Sept. 21th, Anuradha Gupta, Univ. Mississippi**(slides, video)**Oct. 5th, Pedro Espino, Penn State Univ.**(slides)**Oct. 19th, Luís Felipe, Univ. Jena**(slides, video)**Nov. 2nd, Alex Friedland, SLAC**(slides, video)**Nov. 16th, Alexander Haber, Wash. Univ. St. Louis**(video)**Nov. 30th, David Vartanyan, Carnegie Sci. Inst.**(video)**Dec. 14th, Luke Johns, Los Alamos Natl. Lab.**(video)