6 papers
Statistical Fluctuations as Primordial Correlators in the CMB: Finite Chemical Potential Thermodynamics
Anish Ghoshal, Anupam Mazumdar, Bartłomiej Sikorski
Can primordial cosmological correlations originate from statistical fluctuations of an early-universe thermal system? We connect grand-canonical thermodynamics, stochastic transpor…
Weights of strongly nilpotent special multi-flags
Bartłomiej Sikorski
This paper is devoted to two distinguished families of distributions: special multi-flags and their lower-rank counterparts, Goursat distributions. It is known that these two famil…
Planck mass gravitinos in Einstein-Maxwell backgrounds
Artur Krawczyk, Krzysztof A. Meissner, Hermann Nicolai +1
Charged massive spin-3/2 fields have long been regarded as problematic, because their coupling to electromagnetism generically leads to loss of hyperbolicity, acausal propagation a…
Hawking radiation far away from the event horizon
Dawid Maskalaniec, Bartłomiej Sikorski
We study particle production in Vaidya spacetime. Using the WKB approximation, the distribution of Hawking radiation is calculated without the near-horizon approximation, which lea…
Bessel potentials and Green functions on pseudo-Euclidean spaces
Jan Dereziński, Bartłomiej Sikorski
We review properties of Bessel potentials, that is, inverse Fourier transforms of (regularizations of) on a pseudoEuclidean space with signature $…
Higher derivatives of the end-point map of a linear control system via adapted coordinates
Michał Jóźwikowski, Bartłomiej Sikorski
We study the end-point map of a control-linear system in a neighborhood of an arbitrarily chosen trajectory. In particular, we want to calculate the -th order derivative of this…