Graduate Seminar, 26th March

Speaker: Artur Miroszewski

Title: Evolution in classical and quantum systems

Abstract: Although people tend to understand intuitively the passage of time, its status in physical theories is still puzzling. During the talk I will distinguish between notions of time and clocks and I will motivate why only the latter has a physical significance. Using this assumption I will introduce reformulated theory of classical mechanics in which one can easily change clock (so called pseudo-canonical transformations) with respect to which the dynamics is observed.
I will then quantize the new theory and study what impact the new formulation has on our basic understanding of quantum mechanics.

Graduate Seminar, 19th March

SpeakerVarvara Batozskaya

Title: Measurement of CP observables in B0s->J/psi(ee)Phi(KK) decay at the LHCb experiment

Abstract: The determination of the CP-violating phase phi_s in B0s->J/psiPhi decays is one of the key goals of the LHCb experiment. Its value is predicted to be very small in the Standard Model. However, it can be significantly enhanced by contributions from effects of new physics. The first measurement of the CP-violating parameters in electron mode of the B0s->J/psiPhi decay using Run1 data collected at the LHCb will be discussed.

Graduate Seminar, 12th March

Speaker:  Chetan Bavdhankar

Title: Our velocity and acceleration in the Universe are in the same direction! (Local Group Motion using Supernova type Ia)

Abstract: Supernova type Ia (SN Ia) are one of the accurate distance indicators which are used to measure the distances to distant galaxies. Using the redshift of the galaxy and it’s distance (estimated from SN Ia) we can measure its peculiar velocity. Nearby galaxies in the Universe are bound gravitationally and these bound systems of galaxies are called galaxy groups. We are part of such group which is called ‘The Local Group’ (LG), Andromeda galaxy is also member of this group. These galaxy groups show motion due to nearby masses such as other groups, clusters and superclusters. Our Local Group is also showing such motion and this motion can be seen in CMB dipole. To estimate the responsible masses for this motion of Local Group, dipole in peculiar velocities is useful. This dipole in peculiar velocities has the information about effective distance that can cause our group’s motion. In my work, I have tried to calculate that distance. As SN Ia are not very frequent events, we don’t have enough data points to get very accurate results so we need to generate artificial data more realistically. I have used velocity fields in the Local Universe to generate such a artificial SN Ia data and got the results which says that ‘Our velocity and acceleration in the Universe are in the same direction!’