The phenomenon of cosmological gravitational particle production (CGPP) is
expected to occur during the period of inflation and the transition into a hot
big bang cosmology. Particles may be produced even if they only couple directly
to gravity, and so CGPP provides a natural explanation for the origin of dark
matter. In this work we study the gravitational production of massive spin-2
particles assuming two different couplings to matter. We evaluate the full
system of mode equations, including the helicity-0 modes, and by solving them
numerically we calculate the spectrum and abundance of massive spin-2 particles
that results from inflation on a hilltop potential. We conclude that CGPP might
provide a viable mechanism for the generation of massive spin-2 particle dark
matter during inflation, and we identify the favorable region of parameter
space in terms of the spin-2 particle's mass and the reheating temperature. As
a secondary product of our work, we identify the conditions under which such
theories admit ghost or gradient instabilities, and we thereby derive a
generalization of the Higuchi bound to Friedmann-Robertson-Walker (FRW)
spacetimes.
Описание
Cosmological gravitational particle production of massive spin-2 particles
%0 Generic
%1 kolb2023cosmological
%A Kolb, Edward W.
%A Ling, Siyang
%A Long, Andrew J.
%A Rosen, Rachel A.
%D 2023
%K tifr
%T Cosmological gravitational particle production of massive spin-2
particles
%U http://arxiv.org/abs/2302.04390
%X The phenomenon of cosmological gravitational particle production (CGPP) is
expected to occur during the period of inflation and the transition into a hot
big bang cosmology. Particles may be produced even if they only couple directly
to gravity, and so CGPP provides a natural explanation for the origin of dark
matter. In this work we study the gravitational production of massive spin-2
particles assuming two different couplings to matter. We evaluate the full
system of mode equations, including the helicity-0 modes, and by solving them
numerically we calculate the spectrum and abundance of massive spin-2 particles
that results from inflation on a hilltop potential. We conclude that CGPP might
provide a viable mechanism for the generation of massive spin-2 particle dark
matter during inflation, and we identify the favorable region of parameter
space in terms of the spin-2 particle's mass and the reheating temperature. As
a secondary product of our work, we identify the conditions under which such
theories admit ghost or gradient instabilities, and we thereby derive a
generalization of the Higuchi bound to Friedmann-Robertson-Walker (FRW)
spacetimes.
@misc{kolb2023cosmological,
abstract = {The phenomenon of cosmological gravitational particle production (CGPP) is
expected to occur during the period of inflation and the transition into a hot
big bang cosmology. Particles may be produced even if they only couple directly
to gravity, and so CGPP provides a natural explanation for the origin of dark
matter. In this work we study the gravitational production of massive spin-2
particles assuming two different couplings to matter. We evaluate the full
system of mode equations, including the helicity-0 modes, and by solving them
numerically we calculate the spectrum and abundance of massive spin-2 particles
that results from inflation on a hilltop potential. We conclude that CGPP might
provide a viable mechanism for the generation of massive spin-2 particle dark
matter during inflation, and we identify the favorable region of parameter
space in terms of the spin-2 particle's mass and the reheating temperature. As
a secondary product of our work, we identify the conditions under which such
theories admit ghost or gradient instabilities, and we thereby derive a
generalization of the Higuchi bound to Friedmann-Robertson-Walker (FRW)
spacetimes.},
added-at = {2023-02-10T04:44:43.000+0100},
author = {Kolb, Edward W. and Ling, Siyang and Long, Andrew J. and Rosen, Rachel A.},
biburl = {https://www.bibsonomy.org/bibtex/22a9cbbcb5032348547700b0656219bbf/citekhatri},
description = {Cosmological gravitational particle production of massive spin-2 particles},
interhash = {a3077740b7d5d4878a465200fdfd5948},
intrahash = {2a9cbbcb5032348547700b0656219bbf},
keywords = {tifr},
note = {cite arxiv:2302.04390Comment: 46 pages + references, 9 figures},
timestamp = {2023-02-10T04:44:43.000+0100},
title = {Cosmological gravitational particle production of massive spin-2
particles},
url = {http://arxiv.org/abs/2302.04390},
year = 2023
}