arXiv subjects
Publications and source records attributed to Zygmunt Lalak.
Effective Lagrangian describing gravitational source spin-particle spin interactions is given. Cosmological and astrophysical consequences of such interaction are examined. Although stronger than expected, the spin-spin interactions do not change any cosmological effect observed so far. They are important for background primordial neutrinos.
We consider curved space quantum corrections to the equations of motion of the inflaton field in the early Universe. Using the stochastic formalism in phase space, we demonstrate that the quantum corrected evolution of the inflaton can differ dramatically from its classical evolution when the mass scales in the potential become large, which is naturally the case in fundamental theories describing Planck scale physics. Using the example of the cosine potential, we show that the prolonged, perhaps even eternal, quantum--inflationary period is expected with a significant probability. This feature of Planck scale potentials can be dangerous, but it offers also a possibility of creating the inflationary phase in string or supergravity models, where no natural realization of inflation has been found so far.
It is shown that quantum fluctuations due to a nontrivial gravitational background in the flat radiation dominated universe can play an important cosmological role generating nonvanishing cosmological global charge, e.g. baryon number, asymmetry. The explicit form of the fluctuations at vacuum and at finite temperature is given. Implications for particle physics are discussed.