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2022

Parity asymmetry of primordial scalar and tensor power spectra

Kumar, K. Sravan, Marto, João

Understand

Although the cosmic microwave background (CMB) is largely understood to be homogeneous and isotropic, the CMB angular power spectra present anomalies that seem to break down parity symmetry at large angular scales.

We argue that the primordial scalar and tensor power spectra can be parity asymmetric in our new construction of inflationary quantum fluctuations.
Our formulation stems from the foundational questions of quantum field theory in curved spacetime in which we impose geometric superselection rules to the vacuum structure for (single-field) inflationary quantum fluctuations based on discrete spacetime transformations ($\mathcal{P}\mathcal{T}$).
As a result, we estimate the amplitude of power asymmetry in the scalar and tensor sectors at different scales of $ 10^{-4} {\rm Mpc^{-1}}\lesssim k\lesssim 10^{-3}{\rm Mpc^{-1}}$.

Built on

J. F. Donoghue and G. Menezes, “Arrow of Causality and Quantum Gravity,” Phys. Rev. Lett
Original
1908
Earlier work this paper cites.
E. A. Mazenc and D. Ranard, “Target space entanglement entropy,” JHEP
Original
1910
Earlier work this paper cites.
G. C. Wick, A. S. Wightman, and E. P. Wigner, “The intrinsic parity of elementary particles,” Phys. Rev
1952
Earlier work this paper cites.
Cambridge University Press, 1956
E. Schrödinger, Expanding Universe · 1956
Earlier work this paper cites.
A. A. Starobinsky, “Spectrum of relict gravitational radiation and the early state of the universe,” JETP Lett
1979
Earlier work this paper cites.
A. A. Starobinsky, “A New Type of Isotropic Cosmological Models Without Singularity,” Phys. Lett
1980
Earlier work this paper cites.
Cambridge Monographs on Mathematical Physics. Cambridge Univ. Press, Cambridge, UK, 2, 1984
N. D. Birrell and P. C. W. Davies, Quantum Fields in Curved Space · 1984
Earlier work this paper cites.
B. Allen, “Vacuum States in de Sitter Space,” Phys. Rev. D
1985
Earlier work this paper cites.

Similar

N. Sánchez, “Quantum field theory and the “elliptic interpretation” of de sitter spacetime,” Nuclear Physics B
1987
Cited alongside, same era.
M. Parikh, I. Savonije, and E. Verlinde, “Elliptic de sitter space:ds/z2,” Physical Review D
2003
Cited alongside, same era.
J. F. Donoghue and G. Menezes, “Quantum causality and the arrows of time and thermodynamics,” Prog. Part. Nucl. Phys
Original
2003
Cited alongside, same era.
Cambridge Monographs on Mathematical Physics. Univ. Pr., Cambridge, UK, 2004
C. Rovelli, Quantum gravity · 2004
Cited alongside, same era.
Y.-S. Piao and Y.-Z. Zhang, “Phantom inflation and primordial perturbation spectrum,” Phys. Rev. D
2004
Cited alongside, same era.