Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Let Effective Field Theory of Inflation flow: stochastic generation of
  models with red/blue tensor tilt   We extend the method of Flow Equations to the Effective Field Theory
framework of inflation, in order to investigate the observable predictions of a
very broad class of inflationary models. Focusing our attention on the
gravitational-wave sector, we derive a general expression for the consistency
relation for effective models and provide a numerical implementation which
allows to study how the generated models populate the $(r,nt)$ plane. We
analyse $5 \times 10^{4}$ realizations of inflationary scenarios that respect
the Null-Energy Condition ($\epsilon > 0$) and $5 \times 10^{4}$ realizations
that violate it ($\epsilon > 0$). In both cases, 90% of the viable models are
below the most recent upper bound on the tensor-to-scalar ratio from Planck and
BICEP2/Keck Array BK15 data: $r_{0.002} < 0.056$ at 95 % CL. We find that
general EFT inflationary models with $\epsilon > 0$ are typically characterized
by $n_{t} < 0$, whereas the vast majority of NEC-violating models presents a
blue-tilted spectrum ($n_{t} > 0$). Since a blue tensor spectral index implies
more power on small scales, this result is of considerable interest in view of
a possible direct detection of the primordial gravitational-wave background.

16
The categories of this paper are: stat
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc