Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fakeons and microcausality: light cones, gravitational waves and the
  Hubble constant   The concept of fake particle, or "fakeon", allows us to make sense of quantum
gravity as an ultraviolet complete theory, by renouncing causality at very
small distances. We investigate whether the violation of microcausality can be
amplified or detected in the most common settings. We show that it is actually
short range for all practical purposes. Due to our experimental limitations,
the violation does not propagate along the light cones or by means of
gravitational waves. In some cases, the universe even conspires to make the
effect disappear. For example, the positivity of the Hubble constant appears to
be responsible for the direction of time in the early universe.

25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con