Welcome to my website. In this site, I have collected stuff related with my scientific work. The main goal of my research is to relate quantum gravitational effects with astronomical observations. I develop the idea of indirect approach in searching for the quantum gravity effects, with use of the astronomical observations. In these studies I base mainly on predictions of loop quantum cosmology and loop quantum gravity. I explore the idea of nonsingular Universe, the so-called Big Bounce. My investigations concern also relations between different apporaches to quantum gravity. I am researcher the Jagiellonian University in Cracow and at the National Centre for Nuclear Research in Warsaw. In 2012 I completed my PhD thesis ``Perturbations in loop quantum cosmology '' at the Jagiellonian University. Earlier, I graduated in theoretical physics and astronomy from the same University. Have fun with visiting this site!

Published papers

  1. J. P. Gazeau, J. Mielczarek and W. Piechocki, ``Quantum states of the bouncing universe,'' Phys. Rev. D 87 (2013) 123508 .
  2. J. Mielczarek, ``Asymptotic silence in loop quantum cosmology,'' AIP Conf. Proc. 1514 (2012) 81 .
  3. J. Mielczarek, W. Piechocki, ``Gaussian state for the bouncing quantum cosmology,'' Phys. Rev. D 86 (2012) 083508 .
  4. J. Mielczarek, M. Kamionka ``Smoothed quantum fluctuations and CMB observations,' Int. J. Mod. Phys. D 21 (2012) 1250080 .
  5. T. Cailleteau, J. Mielczarek, A. Barrau, J. Grain, ``Anomaly-free scalar perturbations with holonomy corrections in loop quantum cosmology,'' Class. Quantum Grav. 29 (2012) 095010.
  6. J. Mielczarek, T. Cailleteau, A. Barrau, J. Grain, ``Anomaly-free vector perturbations with holonomy corrections in loop quantum cosmology,'' Class. Quantum Grav. 29 (2012) 085009 .
  7. J. Mielczarek, W. Piechocki ``Evolution in bouncing quantum cosmology,'' Class. Quantum Grav. 29 (2012) 065022.
  8. J. Mielczarek, W. Piechocki ``Quantum of volume in de Sitter space,'' Phys. Rev. D 83 (2011) 104003.
  9. J. Mielczarek, ``Reheating temperature from the CMB,'' Phys. Rev. D 83 (2011) 023502.
  10. J. Grain, A. Barrau, T. Cailleteau, J. Mielczarek, ``Observing the big bounce with tensor modes in the cosmic microwave background: Phenomenology and fundamental loop quantum cosmology parameters,'' Phys. Rev. D 82 (2010) 123520.
  11. J. Mielczarek, T. Stachowiak and M. Szydlowski, ``Vortex in axion condensate as a dark matter halo,'' IJMPD, Vol: 19 Iss: 11 (2010) 1843.
  12. J. Mielczarek, W. Piechocki ``Observables for a Friedmann-Robertson-Walker model with a cosmological constant in the framework of loop cosmology,'' Phys. Rev. D 82 (2010) 043529.
  13. J. Mielczarek, M. Kamionka, A. Kurek and M. Szydlowski, ``Observational hints on the Big Bounce,'' JCAP 07 (2010) 004.
  14. J. Mielczarek, T. Cailleteau, J. Grain, A. Barrau ``Inflation in loop quantum cosmology: dynamics and spectrum of gravitational waves,'' Phys. Rev. D 81 (2010) 104049.
  15. J. Mielczarek, ``Possible observational effects of loop quantum cosmology,'' Phys. Rev. D 81 (2010) 063503.
  16. O. Hrycyna, J. Mielczarek and M. Szydlowski ``Asymmetric cyclic evolution in polymerised cosmology,'' JCAP 0912 (2009) 023.
  17. J. Mielczarek, O. Hrycyna and M. Szydlowski, ``Effective dynamics of the closed loop quantum cosmology,'' JCAP 0911 (2009) 014.
  18. J. Mielczarek, ``Tensor power spectrum with holonomy corrections in LQC,'' Phys. Rev. D 79 (2009) 123520.
  19. J. Mielczarek, ``Multi-fluid potential in the loop cosmology,'' Phys. Lett. B 675 (2009) 273.
  20. J. Mielczarek, ``Gravitational waves from the Big Bounce'', JCAP 0811 (2008) 011.
  21. O. Hrycyna, J. Mielczarek and M. Szydlowski, `` Effects of the quantisation ambiguities on the Big Bounce dynamics,'' Gen. Rel. Grav. 41 (2009) 1025.
  22. J. Mielczarek and M. Szydlowski, ``Universe from vacuum in loop-string quantum cosmology,'' JCAP 0808 (2008) 014.
  23. J. Mielczarek and M. Szydlowski, ``Emerging singularities in the bouncing loop cosmology'', Phys. Rev. D 77 (2008) 124008.
  24. J. Mielczarek, T. Stachowiak and M. Szydlowski, ``Exact solutions for Big Bounce in loop quantum cosmology'', Phys. Rev. D 77 (2008) 123506.
  25. J. Mielczarek and M. Szydlowski, ``Relic gravitons as the observable for Loop Quantum Cosmology'', Phys. Lett. B 657 (2007) 20.

Preprints

  1. J. Mielczarek, ``Loop-deformed Poincare algebra,'' [arXiv:1304.2208]. (Received an honorable mention in the 2013 essay competition of the Gravity Research Foundation)
  2. J. Mielczarek, ``Signature change in loop quantum cosmology,'' [arXiv:1207.4657].