Click here to flash read.
In this letter we introduce the non-linear partial differential equation
(PDE) $\partial^2_{\tau} \pi \propto (\vec\nabla \pi)^2$ showing a new type of
instability. Such equations appear in the effective field theory (EFT) of dark
energy for the $k$-essence model as well as in many other theories based on the
EFT formalism. We demonstrate the occurrence of instability in the cosmological
context using a relativistic $N$-body code, and we study it mathematically in
3+1 dimensions within spherical symmetry. We show that this term dominates for
the low speed of sound limit where some important linear terms are suppressed.
Click here to read this post out
ID: 146347; Unique Viewers: 0
Unique Voters: 0
Total Votes: 0
Votes:
Latest Change: May 23, 2023, 7:32 a.m.
Changes:
Dictionaries:
Words:
Spaces:
Views: 8
CC:
No creative common's license
No creative common's license
Comments: