{"id":"https://openalex.org/W4391564362","doi":"https://doi.org/10.3390/sym16020194","title":"Sustaining Quasi De-Sitter Inflation with Bulk Viscosity","display_name":"Sustaining Quasi De-Sitter Inflation with Bulk Viscosity","publication_year":2024,"publication_date":"2024-02-06","ids":{"openalex":"https://openalex.org/W4391564362","doi":"https://doi.org/10.3390/sym16020194"},"language":"en","primary_location":{"id":"doi:10.3390/sym16020194","is_oa":true,"landing_page_url":"https://doi.org/10.3390/sym16020194","pdf_url":"https://www.mdpi.com/2073-8994/16/2/194/pdf?version=1708309102","source":{"id":"https://openalex.org/S190787756","display_name":"Symmetry","issn_l":"2073-8994","issn":["2073-8994"],"is_oa":true,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Symmetry","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://www.mdpi.com/2073-8994/16/2/194/pdf?version=1708309102","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5091161124","display_name":"Sayantani Lahiri","orcid":"https://orcid.org/0000-0002-2187-5901"},"institutions":[{"id":"https://openalex.org/I114090438","display_name":"Goethe University Frankfurt","ror":"https://ror.org/04cvxnb49","country_code":"DE","type":"education","lineage":["https://openalex.org/I114090438"]},{"id":"https://openalex.org/I180437899","display_name":"University of Bremen","ror":"https://ror.org/04ers2y35","country_code":"DE","type":"education","lineage":["https://openalex.org/I180437899"]},{"id":"https://openalex.org/I4210099940","display_name":"SpaceTech (Germany)","ror":"https://ror.org/0135n9613","country_code":"DE","type":"company","lineage":["https://openalex.org/I4210099940"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"Sayantani Lahiri","raw_affiliation_strings":["Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, 28359 Bremen, Germany","Institut f\u00fcr Theoretische Physik, Goethe Universit\u00e4t Frankfurt, Max-von-Laue-Str.1, 60438 Frankfurt am Main, Germany"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, 28359 Bremen, Germany","institution_ids":["https://openalex.org/I180437899","https://openalex.org/I4210099940"]},{"raw_affiliation_string":"Institut f\u00fcr Theoretische Physik, Goethe Universit\u00e4t Frankfurt, Max-von-Laue-Str.1, 60438 Frankfurt am Main, Germany","institution_ids":["https://openalex.org/I114090438"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5034731703","display_name":"Luciano Rezzolla","orcid":"https://orcid.org/0000-0002-1330-7103"},"institutions":[{"id":"https://openalex.org/I114090438","display_name":"Goethe University Frankfurt","ror":"https://ror.org/04cvxnb49","country_code":"DE","type":"education","lineage":["https://openalex.org/I114090438"]},{"id":"https://openalex.org/I205274468","display_name":"Trinity College Dublin","ror":"https://ror.org/02tyrky19","country_code":"IE","type":"education","lineage":["https://openalex.org/I205274468"]},{"id":"https://openalex.org/I2801628138","display_name":"Frankfurt Institute for Advanced Studies","ror":"https://ror.org/05vmv8m79","country_code":"DE","type":"facility","lineage":["https://openalex.org/I2801628138"]}],"countries":["DE","IE"],"is_corresponding":true,"raw_author_name":"Luciano Rezzolla","raw_affiliation_strings":["Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, 60438 Frankfurt am Main, Germany","Institut f\u00fcr Theoretische Physik, Goethe Universit\u00e4t Frankfurt, Max-von-Laue-Str.1, 60438 Frankfurt am Main, Germany","School of Mathematics, Trinity College Dublin, D02 PN40 Dublin, Ireland"],"raw_orcid":"https://orcid.org/0000-0002-1330-7103","affiliations":[{"raw_affiliation_string":"Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, 60438 Frankfurt am Main, Germany","institution_ids":["https://openalex.org/I2801628138"]},{"raw_affiliation_string":"Institut f\u00fcr Theoretische Physik, Goethe Universit\u00e4t Frankfurt, Max-von-Laue-Str.1, 60438 Frankfurt am Main, Germany","institution_ids":["https://openalex.org/I114090438"]},{"raw_affiliation_string":"School of Mathematics, Trinity College Dublin, D02 PN40 Dublin, Ireland","institution_ids":["https://openalex.org/I205274468"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5034731703"],"corresponding_institution_ids":["https://openalex.org/I114090438","https://openalex.org/I205274468","https://openalex.org/I2801628138"],"apc_list":{"value":2000,"currency":"CHF","value_usd":2165},"apc_paid":{"value":2000,"currency":"CHF","value_usd":2165},"fwci":0.924,"has_fulltext":true,"cited_by_count":3,"citation_normalized_percentile":{"value":0.73382036,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":96},"biblio":{"volume":"16","issue":"2","first_page":"194","last_page":"194"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10095","display_name":"Cosmology and Gravitation Theories","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10095","display_name":"Cosmology and Gravitation Theories","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10025","display_name":"Black Holes and Theoretical Physics","score":0.9983000159263611,"subfield":{"id":"https://openalex.org/subfields/3106","display_name":"Nuclear and High Energy Physics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10026","display_name":"Galaxies: Formation, Evolution, Phenomena","score":0.9860000014305115,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.7713710069656372},{"id":"https://openalex.org/keywords/de-sitter-universe","display_name":"De Sitter universe","score":0.753230094909668},{"id":"https://openalex.org/keywords/volume-viscosity","display_name":"Volume viscosity","score":0.559205174446106},{"id":"https://openalex.org/keywords/equation-of-state","display_name":"Equation of state","score":0.5415322184562683},{"id":"https://openalex.org/keywords/universe","display_name":"Universe","score":0.5056748390197754},{"id":"https://openalex.org/keywords/inflation","display_name":"Inflation (cosmology)","score":0.47101888060569763},{"id":"https://openalex.org/keywords/hubbles-law","display_name":"Hubble's law","score":0.4462048411369324},{"id":"https://openalex.org/keywords/cosmology","display_name":"Cosmology","score":0.44444939494132996},{"id":"https://openalex.org/keywords/mathematical-physics","display_name":"Mathematical physics","score":0.4239829182624817},{"id":"https://openalex.org/keywords/deceleration-parameter","display_name":"Deceleration parameter","score":0.42320191860198975},{"id":"https://openalex.org/keywords/classical-mechanics","display_name":"Classical mechanics","score":0.4195348620414734},{"id":"https://openalex.org/keywords/theoretical-physics","display_name":"Theoretical physics","score":0.3889756500720978},{"id":"https://openalex.org/keywords/viscosity","display_name":"Viscosity","score":0.3643030524253845},{"id":"https://openalex.org/keywords/dark-energy","display_name":"Dark energy","score":0.27460986375808716},{"id":"https://openalex.org/keywords/thermodynamics","display_name":"Thermodynamics","score":0.19455307722091675},{"id":"https://openalex.org/keywords/quantum-mechanics","display_name":"Quantum mechanics","score":0.1659366488456726}],"concepts":[{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.7713710069656372},{"id":"https://openalex.org/C19262093","wikidata":"https://www.wikidata.org/wiki/Q3036474","display_name":"De Sitter universe","level":3,"score":0.753230094909668},{"id":"https://openalex.org/C181556327","wikidata":"https://www.wikidata.org/wiki/Q4014770","display_name":"Volume viscosity","level":3,"score":0.559205174446106},{"id":"https://openalex.org/C53810900","wikidata":"https://www.wikidata.org/wiki/Q214967","display_name":"Equation of state","level":2,"score":0.5415322184562683},{"id":"https://openalex.org/C84999194","wikidata":"https://www.wikidata.org/wiki/Q1","display_name":"Universe","level":2,"score":0.5056748390197754},{"id":"https://openalex.org/C200941418","wikidata":"https://www.wikidata.org/wiki/Q273508","display_name":"Inflation (cosmology)","level":2,"score":0.47101888060569763},{"id":"https://openalex.org/C103874350","wikidata":"https://www.wikidata.org/wiki/Q179916","display_name":"Hubble's law","level":4,"score":0.4462048411369324},{"id":"https://openalex.org/C26405456","wikidata":"https://www.wikidata.org/wiki/Q338","display_name":"Cosmology","level":2,"score":0.44444939494132996},{"id":"https://openalex.org/C37914503","wikidata":"https://www.wikidata.org/wiki/Q156495","display_name":"Mathematical physics","level":1,"score":0.4239829182624817},{"id":"https://openalex.org/C2778086583","wikidata":"https://www.wikidata.org/wiki/Q3363554","display_name":"Deceleration parameter","level":4,"score":0.42320191860198975},{"id":"https://openalex.org/C74650414","wikidata":"https://www.wikidata.org/wiki/Q11397","display_name":"Classical mechanics","level":1,"score":0.4195348620414734},{"id":"https://openalex.org/C33332235","wikidata":"https://www.wikidata.org/wiki/Q18362","display_name":"Theoretical physics","level":1,"score":0.3889756500720978},{"id":"https://openalex.org/C127172972","wikidata":"https://www.wikidata.org/wiki/Q128709","display_name":"Viscosity","level":2,"score":0.3643030524253845},{"id":"https://openalex.org/C172790937","wikidata":"https://www.wikidata.org/wiki/Q18343","display_name":"Dark energy","level":3,"score":0.27460986375808716},{"id":"https://openalex.org/C97355855","wikidata":"https://www.wikidata.org/wiki/Q11473","display_name":"Thermodynamics","level":1,"score":0.19455307722091675},{"id":"https://openalex.org/C62520636","wikidata":"https://www.wikidata.org/wiki/Q944","display_name":"Quantum mechanics","level":1,"score":0.1659366488456726}],"mesh":[],"locations_count":3,"locations":[{"id":"doi:10.3390/sym16020194","is_oa":true,"landing_page_url":"https://doi.org/10.3390/sym16020194","pdf_url":"https://www.mdpi.com/2073-8994/16/2/194/pdf?version=1708309102","source":{"id":"https://openalex.org/S190787756","display_name":"Symmetry","issn_l":"2073-8994","issn":["2073-8994"],"is_oa":true,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Symmetry","raw_type":"journal-article"},{"id":"pmh:oai:doaj.org/article:86f9e63ca74b49c0b592f871c1a98c80","is_oa":false,"landing_page_url":"https://doaj.org/article/86f9e63ca74b49c0b592f871c1a98c80","pdf_url":null,"source":{"id":"https://openalex.org/S4306401280","display_name":"DOAJ (DOAJ: Directory of Open Access Journals)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Symmetry, Vol 16, Iss 2, p 194 (2024)","raw_type":"article"},{"id":"pmh:oai:publikationen.ub.uni-frankfurt.de:79387","is_oa":true,"landing_page_url":"http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/79387","pdf_url":null,"source":{"id":"https://openalex.org/S4306400432","display_name":"Publication Server of Goethe University Frankfurt am Main (Goethe University Frankfurt)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I114090438","host_organization_name":"Goethe University Frankfurt","host_organization_lineage":["https://openalex.org/I114090438"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"doc-type:article"}],"best_oa_location":{"id":"doi:10.3390/sym16020194","is_oa":true,"landing_page_url":"https://doi.org/10.3390/sym16020194","pdf_url":"https://www.mdpi.com/2073-8994/16/2/194/pdf?version=1708309102","source":{"id":"https://openalex.org/S190787756","display_name":"Symmetry","issn_l":"2073-8994","issn":["2073-8994"],"is_oa":true,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Symmetry","raw_type":"journal-article"},"sustainable_development_goals":[],"awards":[],"funders":[{"id":"https://openalex.org/F4320318424","display_name":"Walter Greiner Gesellschaft","ror":null}],"has_content":{"pdf":true,"grobid_xml":false},"content_urls":{"pdf":"https://content.openalex.org/works/W4391564362.pdf"},"referenced_works_count":79,"referenced_works":["https://openalex.org/W1595175340","https://openalex.org/W1608771680","https://openalex.org/W1759494267","https://openalex.org/W1971230011","https://openalex.org/W1973861971","https://openalex.org/W1977449087","https://openalex.org/W1987010236","https://openalex.org/W2001903894","https://openalex.org/W2004188331","https://openalex.org/W2011701449","https://openalex.org/W2012572068","https://openalex.org/W2017158856","https://openalex.org/W2031365352","https://openalex.org/W2046835092","https://openalex.org/W2064452490","https://openalex.org/W2070746989","https://openalex.org/W2079112063","https://openalex.org/W2082786033","https://openalex.org/W2084815217","https://openalex.org/W2086623448","https://openalex.org/W2090959241","https://openalex.org/W2103022510","https://openalex.org/W2111420418","https://openalex.org/W2115185242","https://openalex.org/W2115754103","https://openalex.org/W2116464078","https://openalex.org/W2118265220","https://openalex.org/W2121112036","https://openalex.org/W2134251287","https://openalex.org/W2137439897","https://openalex.org/W2147875900","https://openalex.org/W2154748230","https://openalex.org/W2155678178","https://openalex.org/W2164459358","https://openalex.org/W2223282020","https://openalex.org/W2264227480","https://openalex.org/W2322223927","https://openalex.org/W2345134107","https://openalex.org/W2411773382","https://openalex.org/W2539594189","https://openalex.org/W2624355011","https://openalex.org/W2748299701","https://openalex.org/W2781967897","https://openalex.org/W2896555815","https://openalex.org/W2914055139","https://openalex.org/W2948441502","https://openalex.org/W2949638337","https://openalex.org/W2963884629","https://openalex.org/W3035840211","https://openalex.org/W3037706113","https://openalex.org/W3038127721","https://openalex.org/W3043329655","https://openalex.org/W3082353805","https://openalex.org/W3098899650","https://openalex.org/W3099147878","https://openalex.org/W3099898093","https://openalex.org/W3101875646","https://openalex.org/W3103282112","https://openalex.org/W3103437994","https://openalex.org/W3113790097","https://openalex.org/W3118391121","https://openalex.org/W3121827654","https://openalex.org/W3125787119","https://openalex.org/W3129850160","https://openalex.org/W3141760549","https://openalex.org/W3157834574","https://openalex.org/W3204884332","https://openalex.org/W4205400179","https://openalex.org/W4211141710","https://openalex.org/W4229613464","https://openalex.org/W4253068099","https://openalex.org/W4256093087","https://openalex.org/W4288079944","https://openalex.org/W4299569975","https://openalex.org/W4322733339","https://openalex.org/W4323657712","https://openalex.org/W6636857836","https://openalex.org/W6671966192","https://openalex.org/W6682947570"],"related_works":["https://openalex.org/W3164130844","https://openalex.org/W1977410012","https://openalex.org/W4377097989","https://openalex.org/W2964162145","https://openalex.org/W2792449388","https://openalex.org/W2801799996","https://openalex.org/W4311399201","https://openalex.org/W2940724412","https://openalex.org/W2594162431","https://openalex.org/W4361215320"],"abstract_inverted_index":{"The":[0,138],"de-Sitter":[1,27,94,147],"spacetime":[2],"is":[3,30,149,202],"a":[4,16,57,92,98,114,186,256],"maximally":[5],"symmetric":[6],"Lorentzian":[7],"manifold":[8],"with":[9,43,70,255],"constant":[10],"positive":[11],"scalar":[12,111,206],"curvature":[13,250],"that":[14,29,215],"plays":[15],"fundamental":[17],"role":[18],"in":[19,36,53,175,194,221,264],"modern":[20],"cosmology.":[21],"Here,":[22],"we":[23,184,228],"investigate":[24],"bulk-viscosity-assisted":[25],"quasi":[26,93],"inflation,":[28],"the":[31,37,46,54,79,89,102,116,124,153,156,161,164,172,176,195,198,205,216,222,230,237,241,245,249],"period":[32],"of":[33,56,60,91,101,104,118,155,163,167,178,189,197,209,225,232,248,258],"accelerated":[34,84],"expansion":[35,48],"early":[38,80],"universe":[39,81,95],"during":[40],"which":[41,63,73],"\u2212H\u02d9\u226aH2,":[42],"H(t)":[44],"being":[45],"Hubble":[47],"rate.":[49],"We":[50,159],"do":[51],"so":[52],"framework":[55],"causal":[58,199],"theory":[59,208],"relativistic":[61],"hydrodynamics,":[62],"takes":[64],"into":[65],"account":[66],"non-equilibrium":[67],"effects":[68],"associated":[69],"bulk":[71,105,129,157,179],"viscosity,":[72,106],"may":[74],"have":[75],"been":[76],"present":[77],"as":[78,97,169,171],"underwent":[82],"an":[83,145],"expansion.":[85],"In":[86,182],"this":[87],"framework,":[88],"existence":[90],"emerges":[96],"natural":[99],"consequence":[100],"presence":[103,177],"without":[107],"requiring":[108],"introducing":[109],"additional":[110],"fields.":[112],"As":[113],"result,":[115],"equation":[117,127,166],"state,":[119,168],"determined":[120],"by":[121,235],"numerically":[122],"solving":[123],"generalized":[125],"momentum-conservation":[126],"involving":[128],"viscosity":[130,180],"pressure":[131],"turns":[132],"out":[133],"to":[134,152,204],"be":[135],"time":[136],"dependent.":[137],"transition":[139,173],"timescale":[140,174],"characterising":[141],"its":[142],"departure":[143],"from":[144],"exact":[146],"phase":[148],"intricately":[150],"related":[151],"magnitude":[154],"viscosity.":[158],"examine":[160,229],"properties":[162],"new":[165],"well":[170],"pressure.":[181],"addition,":[183],"construct":[185],"fluid":[187],"description":[188],"inflation":[190],"and":[191,244,252],"demonstrate":[192],"that,":[193],"context":[196],"formalism,":[200],"it":[201],"equivalent":[203],"field":[207],"inflation.":[210,226],"Our":[211],"analysis":[212],"also":[213],"shows":[214],"slow-roll":[217],"conditions":[218],"are":[219],"realised":[220],"bulk-viscosity-supported":[223],"model":[224,234],"Finally,":[227],"viability":[231],"our":[233],"computing":[236],"inflationary":[238],"observables,":[239],"namely":[240],"spectral":[242],"index":[243],"tensor-to-scalar":[246],"ratio":[247],"perturbations,":[251],"compare":[253],"them":[254],"number":[257],"different":[259],"observations,":[260],"finding":[261],"good":[262],"agreement":[263],"most":[265],"cases.":[266]},"counts_by_year":[{"year":2025,"cited_by_count":2},{"year":2024,"cited_by_count":1}],"updated_date":"2026-05-21T06:26:12.895304","created_date":"2025-10-10T00:00:00"}
