Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Importance of mirror modes in binary black hole ringdown waveform   The post-merger signal in binary black hole merger is described by linear,
black-hole perturbation theory. Historically, this has been modeled using the
dominant positive-frequency (corotating) fundamental mode. Recently, there has
been a renewed effort in modeling the post-merger waveform using higher,
positive-frequency overtones in an attempt to achieve greater accuracy in
describing the waveform at earlier times using linear perturbation theory. It
has been shown that the inclusion of higher overtones can shift the linear
regime to the peak of $(l,m)=(2,2)$ spherical harmonic mode. In this work, we
show that the inclusion of negative-frequency (counterrotating) modes, called
'mirror' modes, extends the validity of linear perturbation theory to even
earlier times, with far lower systematic uncertainties in the model in
recovering the remnant parameters at these early times. A good description of
the signal at early times also enables for a greater signal-to-noise ratio to
be accumulated in the ringdown phase, thereby, allowing for a more accurate
measurement of remnant parameters and tests of general relativity.

6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th