Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Chris, Kouvaris"'
Publikováno v:
Physical Review
It is possible that bosonic dark matter forms halos around the Sun or the Earth. We discuss the possibility of probing such halos with atomic clocks. Focusing on either a Higgs portal or photon portal interaction between the dark matter and the Stand
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be5fd2062283ec6b119dc1b50dc952e9
http://arxiv.org/abs/2106.06023
http://arxiv.org/abs/2106.06023
Publikováno v:
Advances in High Energy Physics, Vol 2014 (2014)
Externí odkaz:
https://doaj.org/article/dad2f6c181e948aca3c73d25cb25e3da
Publikováno v:
Maselli, A, Kouvaris, C & Kokkotas, K D 2021, ' Photon spectrum of asymmetric dark stars ', International Journal of Modern Physics D, vol. 30, no. 1, 2150003 . https://doi.org/10.1142/S0218271821500036
Asymmetric Dark Stars, i.e., compact objects formed from the collapse of asymmetric dark matter could potentially produce a detectable photon flux if dark matter particles self-interact via dark photons that kinetically mix with ordinary photons. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8dee8743df12aef2192b3e17c583445
http://cds.cern.ch/record/2676823
http://cds.cern.ch/record/2676823
Autor:
Chris Kouvaris
Publikováno v:
Advances in High Energy Physics, Vol 2013 (2013)
We review severe constraints on asymmetric bosonic dark matter based on observations of old neutron stars. Under certain conditions, dark matter particles in the form of asymmetric bosonic WIMPs can be effectively trapped onto nearby neutron stars, w
Externí odkaz:
https://doaj.org/article/47ec6eac4601429c9a3b7503b62825e9
Autor:
Chris Kouvaris, Ioannis Dalianis
Publikováno v:
Journal of Cosmology and Astroparticle Physics. 2021:046
We calculate the gravitational wave background produced from density perturbations in an early matter domination era where primordial black holes form. The formation of black holes requires perturbations out of the linear regime. Space with such pert
Publikováno v:
Physical Review Letters
Physical review letters, vol 123, iss 9
Grinstein, B, Kouvaris, C & Nielsen, N G 2019, ' Neutron Star Stability in Light of the Neutron Decay Anomaly ', Physical Review Letters, vol. 123, no. 9, 091601 . https://doi.org/10.1103/PhysRevLett.123.091601
Grinstein, Benjamin; Kouvaris, Chris; & Nielsen, Niklas Grønlund. (2019). Neutron Star Stability in Light of the Neutron Decay Anomaly. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/0qh9g51m
Physical review letters, vol 123, iss 9
Grinstein, B, Kouvaris, C & Nielsen, N G 2019, ' Neutron Star Stability in Light of the Neutron Decay Anomaly ', Physical Review Letters, vol. 123, no. 9, 091601 . https://doi.org/10.1103/PhysRevLett.123.091601
Grinstein, Benjamin; Kouvaris, Chris; & Nielsen, Niklas Grønlund. (2019). Neutron Star Stability in Light of the Neutron Decay Anomaly. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/0qh9g51m
A recent proposal suggests that experimental discrepancies on the lifetime of neutrons can be resolved if neutrons decay to dark matter. At the same time it has been demonstrated that such a decay mode would soften the nuclear equation of state resul
Publikováno v:
Chang, J H, Egana-Ugrinovic, D, Essig, R & Kouvaris, C 2019, ' Structure formation and exotic compact objects in a dissipative dark sector ', Journal of Cosmology and Astroparticle Physics, vol. 2019, no. 3, 036 . https://doi.org/10.1088/1475-7516/2019/03/036
We present the complete history of structure formation in a simple dissipative dark-sector model. The model has only two particles: a dark electron, which is a subdominant component of dark matter, and a dark photon. Dark-electron perturbations grow
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d81b660fd451fd2c7005bfd2f19427db
https://arxiv.org/pdf/1812.07000.pdf
https://arxiv.org/pdf/1812.07000.pdf
Publikováno v:
Emken, T, Essig, R, Kouvaris, C & Sholapurkar, M 2019, ' Direct detection of strongly interacting sub-GeV dark matter via electron recoils ', Journal of Cosmology and Astroparticle Physics, vol. 2019, 070 . https://doi.org/10.1088/1475-7516/2019/09/070
We consider direct-detection searches for sub-GeV dark matter via electron scatterings in the presence of large interactions between dark and ordinary matter. Scatterings both on electrons and nuclei in the Earth's crust, atmosphere, and shielding ma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1cd5ceba78b251b166e955a91536469
https://portal.findresearcher.sdu.dk/da/publications/83331417-4cd3-4399-982c-b68a9523c601
https://portal.findresearcher.sdu.dk/da/publications/83331417-4cd3-4399-982c-b68a9523c601
Publikováno v:
Emken, T, Kouvaris, C & Nielsen, N G 2018, ' The Sun as a sub-GeV dark matter accelerator ', Physical Review D, vol. 97, no. 6, 063007 . https://doi.org/10.1103/PhysRevD.97.063007
Physical Review
Physical Review
Sub-GeV halo dark matter that enters the Sun can potentially scatter off hot solar nuclei and be ejected much faster than its incoming velocity. We derive an expression for the rate and velocity distribution of these reflected particles taking into a
Publikováno v:
Kouvaris, C, Tinyakov, P & Tytgat, M H G 2018, ' NonPrimordial Solar Mass Black Holes ', Physical Review Letters, vol. 121, no. 22, 221102 . https://doi.org/10.1103/PhysRevLett.121.221102
Physical review letters, 121 (22
Physical review letters, 121 (22
We propose a mechanism that can convert a sizable fraction of neutron stars into black holes with mass ∼1 M, too light to be produced via stellar evolution. We show that asymmetric fermionic dark matter of mass on the teraelectron volt scale, with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7819b6bdbe5b6142f0c583ca5ec1f4c
https://findresearcher.sdu.dk:8443/ws/files/145574599/NonPrimordial_Solar_Mass_Black_Holes.pdf
https://findresearcher.sdu.dk:8443/ws/files/145574599/NonPrimordial_Solar_Mass_Black_Holes.pdf