ELFT HÍRADÓ

[Balog Janos <balog.janos AT wigner.mta.hu>]

MTA Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk



                          Marton Lajer
                            (ELTE)

             "Truncated Hilbert Space Approach for the 1+1D phi^4 
Theory"


                címmel tartandó szemináriumára.


Kivonat:

We used the massive analogue of the truncated conformal space approach 
to study the broken phase of the 1+1 dimensional scalar phi^4 model in 
finite volume, similarly to the work by S. Rychkov and L. Vitale. In our 
work, the finite size spectrum was determined numerically using an 
effective eigensolver routine, which was followed by a simple 
extrapolation in the cutoff energy. We analyzed both the periodic and 
antiperiodic sectors. The results were compared with semiclassical and 
Bethe-Yang results as well as perturbation theory. We obtained the 
coupling dependence of the infinite volume breather and kink masses for 
moderate couplings. The results fit well with semiclassics and 
perturbative estimations, and confirm the conjecture of Mussardo that at 
most two neutral excitations can exist in the spectrum. We believe that 
improving our method with the renormalization procedure of Rychkov et 
al. enables to measure further interesting quantities such as decay 
rates and the inelastic part of scattering matrices.


Helye: MTA Wigner FK RMI III.ép. Tanácsterem
Ideje: 2016. február 26. péntek du. 14:00 óra



Szívesen látunk minden érdeklődőt.

                                            Balog János