Rescaling strange-cluster stars and its implications on gravitational-wave echoes

Solid states of strange-cluster matter called strangeon matter can form strangeon stars that are highly compact. We show that strangeon matter and strangeon stars can be recast into dimensionless forms by a simple reparametrization and rescaling, through which we manage to maximally reduce the number of degrees of freedom. With this dimensionless scheme, we find that strangeon stars are generally compact enough to feature a photon sphere that is essential to foster gravitational-wave (GW) echoes. Rescaling the dimension back, we illustrate its implications on the expanded dimensional parameter space, and calculate the characteristic GW echo frequencies associated with strangeon stars, showing that the minimum echo frequency is

\sim 8 kHz

for empirical parameter space that satisfies the GW170817 constraint, and can reduce to

O (100)

Hertz at the extended limit.

Note:

8 pages, 6 figures. Published version. Typo fixed

photon: sphere
star
rescaling
gravitational radiation
LIGO
VIRGO
gravitational radiation detector
strange particle
quark: matter
pressure

References(101)

Figures(7)

[1]

Observation of Gravitational Waves from a Binary Black Hole Merger

LIGO Scientific and
Virgo

Collaborations

•

B.P. Abbott
(
- Caltech
)

et al.

- Phys.Rev.Lett. 116 (2016) 6, 061102
•
e-Print:
- 1602.03837
•
DOI:
- 10.1103/PhysRevLett.116.061102

[2]

GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2

LIGO Scientific and
VIRGO

Collaborations

•

Benjamin P. Abbott
(
- LIGO Lab., Caltech
)

et al.

- Phys.Rev.Lett. 118 (2017) 22, 221101,
- Phys.Rev.Lett. 121 (2018) 12, 129901 (erratum)
•
e-Print:
- 1706.01812
•
DOI:
- 10.1103/PhysRevLett.118.221101

[2]

GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2

LIGO Scientific and
VIRGO

Collaborations

•

Benjamin P. Abbott
(
- LIGO Lab., Caltech
)

et al.

- Phys.Rev.Lett. 118 (2017) 22, 221101,
- Phys.Rev.Lett. 121 (2018) 12, 129901 (erratum)
•
e-Print:
- 1706.01812
•
DOI:
- 10.1103/PhysRevLett.118.221101

[3]

GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs

LIGO Scientific and
Virgo

Collaborations

•

B.P. Abbott
(
- LIGO Lab., Caltech
)

et al.

- Phys.Rev.X 9 (2019) 3, 031040
•
e-Print:
- 1811.12907
•
DOI:
- 10.1103/PhysRevX.9.031040

[4]

GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral

LIGO Scientific and
Virgo

Collaborations

•

B.P. Abbott
(
- LIGO Lab., Caltech
)

et al.

- Phys.Rev.Lett. 119 (2017) 16, 161101
•
e-Print:
- 1710.05832
•
DOI:
- 10.1103/PhysRevLett.119.161101

[5]

Properties of the binary neutron star merger GW170817

LIGO Scientific and
Virgo

Collaborations

•

B.P. Abbott
(
- LIGO Lab., Caltech
)

et al.

- Phys.Rev.X 9 (2019) 1, 011001
•
e-Print:
- 1805.11579
•
DOI:
- 10.1103/PhysRevX.9.011001

[6]

GW190425: Observation of a Compact Binary Coalescence with Total Mass $\sim 3.4 M_{\odot}$

LIGO Scientific and
Virgo

Collaborations

•

B.P. Abbott
(
- LIGO Lab., Caltech
)

et al.

- Astrophys.J.Lett. 892 (2020) 1, L3
•
e-Print:
- 2001.01761
•
DOI:
- 10.3847/2041-8213/ab75f5

[7]

GW190814: Gravitational Waves from the Coalescence of a 23 Solar Mass Black Hole with a 2.6 Solar Mass Compact Object

LIGO Scientific and
Virgo

Collaborations

•

R. Abbott
(
- LIGO Lab., Caltech
)

et al.

- Astrophys.J.Lett. 896 (2020) 2, L44
•
e-Print:
- 2006.12611
•
DOI:
- 10.3847/2041-8213/ab960f

[8]

Gravitational Condensate Stars: An Alternative to Black Holes

Pawel O. Mazur
(
- South Carolina U.
)
,
Emil Mottola
(
- Los Alamos
)

- Universe 9 (2023) 2, 88,
- Universe 9 (2023) 88
•
e-Print:
- gr-qc/0109035
•
DOI:
- 10.3390/universe9020088

[9]

General relativistic boson stars

- Class.Quant.Grav. 20 (2003) R301-R356
•
e-Print:
- 0801.0307
•
DOI:
- 10.1088/0264-9381/20/20/201

[10]

Not quite a black hole

Bob Holdom
(
- Toronto U.
)
,
Jing Ren
(
- Toronto U.
)

- Phys.Rev.D 95 (2017) 8, 084034
•
e-Print:
- 1612.04889
•
DOI:
- 10.1103/PhysRevD.95.084034

[11]

A ghost and a naked singularity; facing our demons

Bob Holdom
(
- Toronto U.
)

e-Print:
- 1905.08849

[12]

Anatomy of a thermal black hole mimicker

Jing Ren
(
- Beijing, Inst. High Energy Phys.
)

- Phys.Rev.D 100 (2019) 12, 124012
•
e-Print:
- 1905.09973
•
DOI:
- 10.1103/PhysRevD.100.124012

[13]

Towards rotating 2-2-holes

Bob Holdom

e-Print:
- 2208.08461

[14]

Testing the nature of dark compact objects: a status report

Vitor Cardoso
(
- Lisbon U. and
- CERN
)
,
Paolo Pani
(
- Rome U. and
- INFN, Rome
)

- Living Rev.Rel. 22 (2019) 1, 4
•
e-Print:
- 1904.05363
•
DOI:
- 10.1007/s41114-019-0020-4

[15]

The Reflection of Gravitational Waves from Compact Stars

Yu.G. Ignatev
(
- Kazan State U.
)
,
A.V. Zakharov
(
- Kazan State U.
)

- Phys.Lett.A 66 (1978) 3-4
•
DOI:
- 10.1016/0375-9601(78)90084-1

[16]

Is the gravitational-wave ringdown a probe of the event horizon?

Vitor Cardoso
(
- Lisbon, CENTRA and
- Lisbon, IST and
- Perimeter Inst. Theor. Phys.
)
,
Edgardo Franzin
(
- Cagliari U. and
- INFN, Cagliari and
- Lisbon, CENTRA and
- Lisbon, IST
)
,
Paolo Pani
(
- Rome U. and
- INFN, Rome and
- Lisbon, CENTRA and
- Lisbon, IST
)

- Phys.Rev.Lett. 116 (2016) 17, 171101,
- Phys.Rev.Lett. 117 (2016) 8, 089902 (erratum)
•
e-Print:
- 1602.07309
•
DOI:
- 10.1103/PhysRevLett.116.171101

[16]

Is the gravitational-wave ringdown a probe of the event horizon?

Vitor Cardoso
(
- Lisbon, CENTRA and
- Lisbon, IST and
- Perimeter Inst. Theor. Phys.
)
,
Edgardo Franzin
(
- Cagliari U. and
- INFN, Cagliari and
- Lisbon, CENTRA and
- Lisbon, IST
)
,
Paolo Pani
(
- Rome U. and
- INFN, Rome and
- Lisbon, CENTRA and
- Lisbon, IST
)

- Phys.Rev.Lett. 116 (2016) 17, 171101,
- Phys.Rev.Lett. 117 (2016) 8, 089902 (erratum)
•
e-Print:
- 1602.07309
•
DOI:
- 10.1103/PhysRevLett.116.171101